Corrosion suppression of closed-loop coolant using polymerate and non-borate buffers.

Abstract

A method for inhibiting corrosion of a metal surface in contact with an aqueous medium is provided. The method can include contacting a metal surface with a corrosion inhibitor composition, which can include a compound of formula (I) or a salt thereof. The disclosed corrosion inhibitor compositions are particularly useful for inhibiting corrosion in closed-loop systems. JPEG2023527312000027.jpg3368

Description

【Technical Field】 【0001】 Background 1. Technical Field The present disclosure generally relates to corrosion inhibitor compositions. More specifically, the present disclosure relates to a polymaleate-containing corrosion inhibitor composition for suppressing corrosion in a closed-loop water circulation system. 【0002】 2. Description of Related Art In a closed-loop water circulation system, water is typically circulated for long periods of time without the addition or removal of water. Water removal may be necessary due to contamination. For example, some chemical additives provide a nutrient source for microorganisms to grow and form biofilms or other deposits that impede efficient heat transfer. Often, chemicals are added to prevent the growth of microorganisms or to prevent the corrosion of metals in contact with the circulating water stream. 【0003】 The corrosion inhibition of carbon steel has evolved over decades, from the use of chromates to the current use of heavy metals and phosphate chemicals. Decades ago, chromates were banned and were mainly replaced by molybdenum, zinc, silicates, and phosphates. There have been some advancements in phosphate chemicals, from the use of orthophosphates to polyphosphates, and also the use of organic phosphates, phosphonates, and phosphinates. Currently, phosphorus is under environmental pressure and can only be used in very low levels. 【0004】 Iron-based metals such as carbon steel are among the most commonly used structural materials in industrial systems. The loss of metal from the surface due to general corrosion leads to a decrease in mechanical strength, resulting in a reduction in the structural integrity of the system or structure. Localized corrosion (e.g., pitting) can pose an even greater threat to the normal operation of a system than general corrosion because such corrosion occurs severely in one specific location and can cause perforation in the system structure carrying industrial water flow. These perforations can lead to leaks, requiring the shutdown of the entire industrial system to allow for repairs. In practice, corrosion problems typically result in enormous maintenance costs and costs incurred due to equipment failure. 【0005】 While steel remains widely used, the use of aluminum or aluminum alloys is increasing due to their more desirable thermal properties, such as thermal conductivity and diffusivity. Aluminum and aluminum alloys are stable under ambient conditions, but tend to corrode under aqueous conditions, particularly at high temperatures and in the presence of chloride ions. Aluminum heating elements are incompatible with conventional high-pH corrosion suppression programs. 【0006】 Corrosion protection of metals in industrial water systems is often achieved by adding corrosion inhibitors. Many corrosion inhibitors, including chromates, molybdates, zinc, nitrites, orthophosphates, and polyphosphates, have been used alone or in combination in various chemical treatment formulations. However, these inorganic chemicals may be toxic, harmful to the environment, and / or not very effective against localized corrosion, especially at economically feasible and / or environmentally acceptable low dose levels. [Overview of the Initiative] 【0007】 A method is provided for inhibiting corrosion of a metal surface in contact with an aqueous medium. This method may involve contacting the metal surface with a corrosion inhibitor composition in a closed-loop system, wherein the corrosion inhibitor composition is of formula (I) [ka] It may contain a compound or salt thereof, where L is a single bond or a double bond, and R1 is hydrogen, -CH2-COOH, [ka] Here, n is an integer between 1 and 100, m is an integer between 1 and 100, p is an integer between 2 and 20, R3 is -OH, -OCH3, an aryl group, or a C1-C4 alkyl group, and R2 is hydrogen, -OH, -OCH3, an aryl group, or a C1-C4 alkyl group. 【0008】 In some embodiments, R1 is [ka] That is the case. 【0009】 In some embodiments, R1 is [ka] Therefore, L is a double bond, and R2 is hydrogen. 【0010】 In some embodiments, R1 is [ka] And R2 is -OH. 【0011】 In some embodiments, the corrosion inhibitor composition further comprises a non-borate buffer. 【0012】 In some embodiments, the corrosion inhibitor composition further comprises a nitrate. 【0013】 In some embodiments, the buffer is triethanolamine (TEA), morpholine, N-methylimidazole, 1,4-diazabicyclo[2.2.2]octane, quinuclidine, urotropin, imidazole, methylimidazole, p-phenolsulfonate, diethylethanolamine, methoxypropylamine, borate, phosphate, bicine, glycine, diethylenetriamine, triethylenetetramine, or any combination thereof. 【0014】 In some embodiments, the buffer is a carbonate buffer. 【0015】 In some embodiments, the corrosion inhibitor composition further comprises a silicate. 【0016】 In some embodiments, the corrosion inhibitor composition further comprises an azole selected from the group consisting of tolyltriazole (TT), benzotriazole (BZT), mercaptobenzothiazole (MBT), butylbenzotriazole (BBT), halogen-resistant azole (HRA), benzimidazole, and any combination thereof. 【0017】 In some embodiments, the azole is TT. 【0018】 In some embodiments, the corrosion inhibitor composition further comprises water. 【0019】 In some embodiments, the aqueous medium has a pH of from about 6 to about 12. 【0020】 In some embodiments, the corrosion inhibitor composition does not contain at least one of nitrite, phosphorus, borate, or molybdate. 【0021】 In some embodiments, the method can include adding the corrosion inhibitor composition to an aqueous medium at a concentration of from about 10 ppm to about 50,000 ppm of the compound of formula (I). 【0022】 In some embodiments, the corrosion inhibitor composition comprises about 1% to about 99% by weight of polymaleic acid, about 0.5% to about 90% by weight of silicate, and about 0.5% to about 20% by weight of a buffer. 【0023】 In some embodiments, the metal surface includes mild steel, copper, copper alloys, iron, iron alloys, Admiralty brass, about 90% copper and about 10% nickel, about 80% copper and about 20% nickel, about 70% copper and about 30% nickel, aluminum, aluminum alloys, aluminum brass, manganese brass, leaded naval bronze, phosphor bronze, galvanized steel, and any combination thereof. 【0024】 Silicate, buffer, and formula (I) [ka] A corrosion inhibitor composition is provided comprising a compound or salt thereof, wherein L is a single bond or a double bond, and R1 is hydrogen, -CH2-COOH, [ka] Here, n is an integer between 1 and 100, m is an integer between 1 and 100, p is an integer between 2 and 20, R3 is -OH, -OCH3, an aryl group, or a C1-C4 alkyl group, and R2 is hydrogen, -OH, -OCH3, an aryl group, or a C1-C4 alkyl group. 【0025】 The use of a corrosion inhibitor composition for suppressing corrosion of a metal surface in contact with an aqueous medium is provided. The corrosion inhibitor composition may comprise a compound of formula (I) or a salt thereof, a silicate, and a buffering agent. 【0026】 The foregoing outlines the features and technical advantages of the present disclosure in order to better understand the subsequent embodiments for carrying out the invention. Further features and advantages of the present disclosure, which form the subject matter of the claims of this application, are described below. It should be understood by those skilled in the art that the disclosed concepts and specific embodiments can be readily used as a basis for modifying or designing other embodiments to accomplish the same objectives as the present disclosure. It should also be recognized by those skilled in the art that such equivalent embodiments do not deviate from the spirit and scope of the present disclosure as expressed in the appended claims. [Modes for carrying out the invention] 【0027】 Various embodiments are described below. The relationships and functions of the various elements of the embodiments can be better understood by referring to the detailed description below. However, embodiments are not limited to those illustrated below. In certain examples, details that are not necessary for understanding the embodiments disclosed herein may be omitted. 【0028】 A method is provided for inhibiting corrosion of a metal surface in contact with an aqueous medium. This method may involve contacting the metal surface with a corrosion inhibitor composition in a closed-loop system. 【0029】 As used herein, “closed-loop system” refers to a system that keeps an aqueous medium completely sealed within a pipe or container. Closed-loop systems include closed recirculation loops or closed hot water loops that use a water-based solution to transfer heat. Closed-loop systems can be constructed from a variety of materials, including steel, copper, copper alloys, aluminum, aluminum alloys, and galvanized steel. 【0030】 A closed-loop system may include a surge tank or expansion tank operating at atmospheric pressure or high pressure. Vents are used in the system to help remove oxygen and other gases from the system during startup. The closed-loop system may also include a pump to circulate an aqueous medium throughout the system. 【0031】 In contrast, open systems expose the surface of the aqueous medium to the outside air, thereby causing the water to evaporate and be lost, or exposing the water to a higher risk of contamination. 【0032】 This disclosure relates to a corrosion inhibitor composition and a method for inhibiting corrosion. The inhibitor composition can effectively reduce, inhibit, and / or prevent corrosion and / or scaling on surfaces, such as those containing metal, in soft or hard water. 【0033】 The corrosion inhibitor composition is formula (I) [ka] It may contain a compound or salt thereof, where L is a single bond or a double bond, and R1 is hydrogen, -CH2-COOH, [ka] Here, n is an integer between 1 and 100, m is an integer between 1 and 100, p is an integer between 2 and 20, R3 is -OH, -OCH3, an aryl group, or a C1-C4 alkyl group, and R2 is hydrogen, -OH, -OCH3, an aryl group, or a C1-C4 alkyl group. 【0034】 In some embodiments, L is a single bond. In some embodiments, L is a double bond. In some embodiments, L is a double bond and R2 is hydrogen. 【0035】 In some embodiments, R1 is hydrogen. In some embodiments, R1 is -CH2-COOH. 【0036】 In some embodiments, R1 is [ka] In some embodiments, R3 is -OH, -OCH3, an aryl group, or a C1-C4 alkyl group. In some embodiments, R3 is an aryl group. Examples of aryl groups include benzene and C1~2 Examples of alkyl-substituted phenyl groups include, but are not limited to, toluene or xylene. The integer m may be 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, or 20. In some embodiments, m is an integer from 1 to 10. In some embodiments, m is an integer from 1 to 50. In some embodiments, m is an integer from 1 to 100. 【0037】 In some embodiments, R1 is [ka] Here, L is a double bond and R2 is hydrogen. The integer p can be 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, or 20. In some embodiments, p is an integer from 1 to 10. 【0038】 In some embodiments, R1 is [ka] And R2 is -OH. The integer n can be 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, or 20. In some embodiments, n is an integer from 1 to 10. In some embodiments, m is an integer from 1 to 50. In some embodiments, m is an integer from 1 to 100. 【0039】 In some embodiments, R2 is hydrogen. In some embodiments, R2 is -OH. In some embodiments, R2 is -OCH3. In some embodiments, R2 is a C1-C4 alkyl group. In some embodiments, R2 is an aryl group. Examples of aryl groups include benzene and C 1~2 Examples of alkyl-substituted phenyl groups include, but are not limited to, toluene or xylene. 【0040】 In some embodiments, the corrosion inhibitor composition comprises a hydrolyzable polymaleic acid compound having the structure shown below. The composition may contain one or more of the following compounds. [ka] 【0041】 In some embodiments, hydrolyzed polymaleic acid comprises compound III. In some embodiments, hydrolyzed polymaleic acid comprises compound IV. In some embodiments, hydrolyzed polymaleic acid comprises compound V. In some embodiments, hydrolyzed polymaleic acid comprises compound VI. In some embodiments, the compound of formula (I) or a salt thereof is sodium (3-methylphenyl)methylbutanediate or sodium (4-methylphenyl)methylbutanediate. In some embodiments, the compound of formula (I) is 1,2,3,4-butanetetracarboxylic acid or a salt thereof. 【0042】 In some embodiments, the corrosion inhibitor composition comprises toluene, benzene, or polymaleic acid having xylene-terminated groups. 【0043】 In some embodiments, the corrosion inhibitor composition comprises polyepoxysuccinic acid or a salt thereof. 【0044】 Salts of the compounds of formulas (I) to (VI), hydrolyzed polymaleic acid, and polymaleic acid include, but are not limited to, sodium, potassium, ammonium, and other ammonium cations, such as triethanolammonium, morpholinium, and cyclohexylammonium. 【0045】 The corrosion inhibitor composition may further contain a buffer. The buffer may be a non-borate buffer such as a carbonate buffer, or the buffer may be a primary amine, secondary amine, or tertiary amine. Examples of buffers include, but are not limited to, TEA, morpholine, N-methylimidazole, 1,4-diazabicyclo[2.2.2]octane, quinuclidine, urotropin, imidazole, methylimidazole, p-phenolsulfonate, diethylethanolamine, methoxypropylamine, triethylenetetramine, diethylenetriamine, borate, phosphate, bicine, glycine, or any combination thereof. 【0046】 Other buffering agents useful in this disclosure include, but are not limited to, good buffering agents such as BES, CAPS, HEPES, MES, EPPS, MOPS, PIPES, TAPS, TES, and TRICINE. 【0047】 The corrosion inhibitor compositions disclosed herein can provide corrosion protection equivalent to that of commercially available corrosion inhibitors such as nitrites. In some embodiments, the corrosion inhibitor compositions do not contain at least one of nitrites, phosphorus, borates, or molybdates. In some embodiments, the corrosion inhibitor compositions do not contain tin. In some embodiments, the corrosion inhibitor compositions do not contain zinc. 【0048】 The corrosion inhibitor composition may further contain other additives such as nitrates or silicates. In some embodiments, the corrosion inhibitor composition contains a nitrate. Examples of nitrates include, but are not limited to, sodium nitrate. In some embodiments, the corrosion inhibitor composition contains a silicate. Examples of silicates include, but are not limited to, metasilicates, orthosilicates, pyrosilicates, and their salts. The silicate may be sodium metasilicate. 【0049】 The corrosion inhibitor composition may contain an azole. Examples of azoles include, but are not limited to, TT, BZT, MBT, BBT, HRA, benzimidazole, or salts thereof. Benzimidazole may be a disubstituted benzimidazole. In some embodiments, the azole is TT. 【0050】 In some embodiments, the corrosion inhibitor composition may contain a solvent. Examples of solvents include, but are not limited to, water, acetone, methanol, ethanol, propanol, formic acid, formamide, propylene glycol, ethylene glycol, or combinations thereof. In some embodiments, the corrosion inhibitor composition may contain water. 【0051】 In some embodiments, the corrosion inhibitor composition may consist of a compound of formula (I). In some embodiments, the corrosion inhibitor composition may consist of a compound of formula (I) and a buffer. In some embodiments, the corrosion inhibitor composition may consist of water, a compound of formula (I), a buffer, and a silicate. 【0052】 In some embodiments, a corrosion inhibitor composition containing polymaleic acid or a salt thereof, a silicate, and a buffer may comprise about 1% to about 99% by weight of polymaleic acid, about 0.5% to about 90% by weight of silicate, and about 0.5% to about 20% by weight of buffer. 【0053】 In some embodiments, the amount of compound (I) or its salt added to the aqueous medium is in the range of about 10 ppm to about 50,000 ppm. In some embodiments, the amount of compound (I) is in the range of about 10 ppm to about 500 ppm. In some embodiments, the amount of compound (I) is in the range of about 60 ppm to about 100 ppm. 【0054】 In some embodiments, the amount of buffer added to the aqueous medium is in the range of about 10 ppm to about 50,000 ppm. In some embodiments, the amount of buffer added is in the range of about 10 ppm to about 500 ppm or about 25 ppm to about 150 ppm. 【0055】 In some embodiments, the amount of silicate added to the aqueous medium is in the range of about 1 ppm to about 50,000 ppm. In some embodiments, the amount of silicate added is in the range of about 1 ppm to about 50 ppm or about 15 ppm to about 100 ppm. 【0056】 In some embodiments, azole or a salt thereof may be added to an aqueous medium in an amount of about 0.1 ppm to about 1,000 ppm. In some embodiments, the concentration of azole may be about 20 ppm to about 500 ppm. In some embodiments, the concentration of azole is about 100 ppm, about 150 ppm, about 200 ppm, about 250 ppm, or about 300 ppm. 【0057】 In some embodiments, the method may involve adding a corrosion inhibitor composition to an aqueous medium in a dose of about 0.1% to about 2% by volume. In some embodiments, the dose is about 0.2% by volume, about 0.3% by volume, about 0.4% by volume, about 0.5% by volume, about 0.6% by volume, about 0.7% by volume, about 0.8% by volume, about 0.9% by volume, or about 1.0% by volume. 【0058】 Many different metal surfaces can be in contact with an aqueous medium to which a corrosion inhibitor has been added. For example, the different metal surfaces may include different metals or metal alloys, such as mild steel, aluminum, or copper. In some embodiments, the metal surfaces include a first metal surface containing aluminum, a second metal surface containing mild steel, a third metal surface containing copper, or any combination thereof. In some embodiments, the metal surfaces may include iron, iron alloys, copper, copper alloys, Admiralty brass, about 90% copper and about 10% nickel, about 80% copper and about 20% nickel, about 70% copper and about 30% nickel, aluminum brass, manganese brass, leaded naval bronze, phosphor bronze, or any combination thereof. In some embodiments, the metal surfaces may be at least part of an aluminum boiler. In some embodiments, the corrosion inhibitor composition is added to the aluminum boiler. In some embodiments, the corrosion inhibitor composition is added to a heat exchanger. 【0059】 In some embodiments, the metal surface may be an aluminum alloy. Examples of aluminum alloys include, but are not limited to, Al360, Al4032, Al6061, Al7075, AlSi10Mg, AlSi12, H9-6060, 1000 series alloys, 2000 series alloys, 4000 series alloys, 5000 series alloys, 6000 series alloys, 7000 series alloys, cast 1xx series alloys, cast 2xx series alloys, cast 3xx series alloys, cast 4xx series alloys, cast 5xx series alloys, cast 6xx series alloys, cast 7xx series alloys, or cast 8xx series alloys. 【0060】 The corrosion inhibitor composition can reduce the corrosion rate of a metal surface. In some embodiments, the corrosion rate of the metal surface may be less than about 1 mpy. In some embodiments, the corrosion rate of the metal surface may be less than about 0.5 mpy. 【0061】 In some embodiments, corrosion inhibitor compositions can reduce pitting, crevice corrosion, delamination, and intergranular corrosion of aluminum alloys. As used herein, “pitting” refers to the accelerated, localized dissolution of a metal resulting from the breakdown of other protective passivation films on the metal / alloy surface. Generally, pitting involves three stages: pitting initiation, metastable pitting, and pitting growth. 【0062】 In some embodiments, the corrosion inhibitor composition may include further additives. Examples of additives include, but are not limited to, further corrosion inhibitors, treatment polymers, antimicrobial agents, colorants, fillers, surfactants, viscosity modifiers, chelating agents, dispersants, deodorants, masking agents, oxygen absorbers, or indicator dyes. 【0063】 The corrosion inhibitor composition may contain other additives. For example, the composition may contain phosphinosuccinate oligomer (PSO). In some embodiments, PSO is of formula (II) [ka] It may have the structure shown in formula I, where n is an integer from 1 to 5 and m is an integer from 0 to 5. In some embodiments, n is 1, 2, 3, 4, or 5. In some embodiments, n is an integer from 2 to 5. In some embodiments, n is an integer from 3 to 5. In some embodiments, n is an integer from 1 to 4. In some embodiments, n is an integer from 1 to 3. In some embodiments, m is 0, 1, 2, 3, 4, or 5. In some embodiments, m is 0. In some embodiments, m is 1. In some embodiments, m is 2. In some embodiments, m is 3. In some embodiments, m is 4. In some embodiments, m is 5. In some embodiments, PSO may contain one or more compounds of formula I. In some embodiments, the PSO contains about 10 to 40% by weight of a compound of formula I where n is 1 and m is 0, about 30 to 60% by weight of a compound of formula I where m is 1 and n is 1, and about 20 to 40% by weight of a compound of formula I where n is 1 and m is 2 to 5. U.S. Patent No. 6,572,789 describes a PSO polymer usable in corrosion inhibitor compositions, which is incorporated in whole by reference. 【0064】 In some embodiments, PSO is a mixture of compounds of formula 1. For example, PSO may have molecules in the mixture having n=1, 2, 3, 4, or 5. 【0065】 In some embodiments, PSO may be added to an aqueous medium in an amount of about 10 ppm to about 10,000 ppm. In some embodiments, the concentration of PSO may be about 50 ppm to about 1,000 ppm. In some embodiments, the concentration of PSO is about 100 ppm, about 150 ppm, about 200 ppm, about 250 ppm, or about 300 ppm. 【0066】 In some embodiments, the corrosion inhibitor composition may include a scale inhibitor. The scale inhibitor may be a polymer. Examples of scale inhibitors include, but are not limited to, polyacrylates (PAA), polymaleic anhydride (PMA), alkyl epoxy carboxylates (AEC), polyacrylamide copolymers (AA / AM), acrylic acid and hydroxypropyl acrylate copolymers (AA / HPA), acrylic acid and 2-acrylamide-2-methylpropanesulfonate copolymers (AA / AMPS), maleic anhydride and sulfonated styrene copolymers (MA / SS), acrylic acid / acrylamide / tertiary butylacrylamide copolymers (AA / AM / t-BAM), acrylic acid / 2-acrylamide-2-methylpropanesulfonate / tertiary butylacrylamide (AA / AMPS / t-BAM), acrylic acid / sulfonated styrene / 2-acrylamide-2-methylpropanesulfonate (AA / SS / AMPS), acrylic acid / acrylamide / aminomethylsulfonate copolymers (AA / AM / AMS), and any combination thereof. 【0067】 In some embodiments, the scale inhibitor comprises a copolymer of acrylic acid and t-BAM in a molar ratio of 60:40. 【0068】 In some embodiments, the scale inhibitor polymer may contain about 80 to about 99 mole percent of acrylic acid and about 1 to about 20 mole percent of AMPS. In some embodiments, the copolymer may contain about 95% acrylic acid and about 4% AMPS, or about 90% acrylic acid and about 10% AMPS. In other embodiments, the polymer may be a tetrapolymer containing acrylic acid, itaconic acid, AMPS, and tertiary butylacrylamide in any mole percent. Other polymers that can be used in the inhibitor composition include, but are not limited to, copolymers of acrylic acid and AMPS containing about 40 to about 70% acrylic acid and about 30 to about 60% AMPS. In other embodiments, the polymer may be a copolymer containing about 60% acrylic acid and about 40% AMPS, or about 50% acrylic acid and about 50% AMPS. 【0069】 In some embodiments, the polymer may have a weight-average molecular weight of about 5,000 Da to about 50,000 Da. In some embodiments, the polymer may have a weight-average molecular weight of about 20,000 Da. 【0070】 In some embodiments, the scale inhibitor may comprise about 52% by weight of water, about 47% by weight of a copolymer of acrylic acid and acrylamide tertiary butylsulfonic acid (ATBS), 0.23% by weight of sodium sulfate, 0.01% by weight of sodium bisulfite, and a trace amount of tetrasodium pyrenetetrasulfonate. 【0071】 In certain embodiments, the composition contains an effective amount of scale inhibitor that can be appropriately selected by those skilled in the art. The amount of scale inhibitor added to the aqueous medium may be in the range of about 0.1 ppm to about 100 ppm. In some embodiments, the amount of scale inhibitor may be in the range of about 1 ppm to about 50 ppm, about 0.5 ppm to about 20 ppm, about 1 ppm to about 10 ppm, or about 1 ppm to about 20 ppm. In other embodiments, the amount of scale inhibitor may be in the range of about 5 ppm to about 30 ppm, about 10 ppm to about 20 ppm, or about 5 ppm to about 20 ppm. In some embodiments, the amount of scale inhibitor added to the aqueous system may be about 5 ppm, about 6 ppm, about 7 ppm, about 8 ppm, about 9 ppm, about 10 ppm, about 11 ppm, about 12 ppm, about 13 ppm, about 14 ppm, or about 15 ppm. 【0072】 In some embodiments, the corrosion inhibitor composition may include an inert tracer, thereby enabling compatibility with fluorescence tracing technologies such as 3D TRASAR® technology (available from Nalco Water, an Ecolab Company). In other embodiments, the inert fluorescence tracer may be included in the composition to provide a means for determining the dose level. A known proportion of the fluorescence tracer may be added simultaneously with or sequentially with a dispersant or defoamer. An effective inert fluorescence tracer may include a substance that is chemically nonreactive with other components in the system and does not degrade significantly over time. 【0073】 Typical inactive fluorescent tracers include fluorescein or fluorescein derivatives; rhodamine or rhodamine derivatives; naphthalene sulfonic acid (mono, di, tri, etc.); pyrene sulfonic acid (mono, di, tri, tetra, etc.); stilbene derivatives containing sulfonic acid (including fluorescent whitening agents); biphenyl sulfonic acid; phenylalanine; tryptophan; tyrosine; vitamin B2 (riboflavin); vitamin B6 (pyridoxine); vitamin E (α-tocopherol); ethoxyquin; caffeine; vanilla This includes polymers containing at least one part of naphthalene sulfonic acid formaldehyde condensate polymers; phenyl sulfonic acid formaldehyde condensate; lignin sulfonic acid; polycyclic aromatic hydrocarbons; (poly)cyclic aromatic hydrocarbons containing any combination of amine functional groups, phenol functional groups, sulfonic acid functional groups, and carboxylic acid functional groups; (poly)heterocyclic aromatic hydrocarbons having N, O, or S; and polymers containing at least one part of naphthalene sulfonic acid, pyrene sulfonic acid, biphenyl sulfonic acid, or stilbene sulfonic acid. 【0074】 In some embodiments, further corrosion inhibitors may be zinc, aluminum, manganese, nickel, silicates, molybdates, strontium, titanium, chromates, cobalt, cerium, any salts thereof, any oxides thereof, or any combination thereof. In some embodiments, further corrosion inhibitors may include zinc or any oxide thereof. Further corrosion inhibitors may be in the form of any salt or any oxide. Exemplary, non-limiting examples of inorganic salts may be chlorides, nitrates, nitrites, or sulfates. The salt form may be organic, including but not limited to acetates or citrates. 【0075】 Each component of the corrosion inhibitor composition may be added separately or as a mixture, and this addition may be done manually or automatically using a chemical injection pump and the automated system described herein. The composition (or its components) may be administered periodically or continuously to an aqueous system. 【0076】 Aqueous media to which corrosion inhibitor compositions are added may have specific properties specific to a particular process. For example, a closed-loop system may have a recommended pH operating range or solute concentration. In some embodiments, the aqueous media may have a pH of about 6 to about 12. In some embodiments, the aqueous media may have a pH of about 6, about 6.5, about 7, about 7.5, about 8, about 8.5, about 9, about 9.5, about 10, about 10.5, about 11, about 11.5, or about 12. Generally, for boilers with a significant amount of aluminum, the recommended pH range is about 7.5 to about 8.5. 【0077】 In some embodiments, the aqueous medium has a chloride concentration of less than about 150 ppm. The conductivity of the aqueous medium can range from about 0 μS / cm to several thousand or tens of thousands of μS / cm. The conductivity may be greater than about 500 μS / cm, greater than about 1,000 μS / cm, or greater than about 5,000 μS / cm. 【0078】 The aqueous medium may contain an antifreeze such as ethylene glycol or propylene glycol. The glycol concentration may range from about 20% to about 50% by volume. 【0079】 In some embodiments, the aqueous medium contains an oxidizing halogen compound, such as a bleach. Examples of oxidizing halogen compounds include, but are not limited to, hypochlorite bleaches, chlorine, bromine, hypochlorite, hypobromite, chlorine dioxide, iodine / hypiodic acid, hypobromite, halogenated hydantoin, peroxides, persulfates, permanganates, peracetic acid, or any combination thereof. 【0080】 In some embodiments, the aqueous medium may contain a non-halogen-containing oxidizing biocide. Examples of non-halogen-containing oxidizing biocides include, but are not limited to, 5-chloro-2-methyl-4-isothiazolin-3-one, 2-methyl-4-isothiazolin-3-one, glutaraldehyde, dibromopropionic acid, quaternary ammonium salts, or any combination thereof. 【0081】 The inhibitor compositions of this disclosure may be used in any aqueous system including corrosive surfaces. For example, the inhibitor compositions may be used in once-through, open-loop, or closed-loop recirculation cooling water systems. Other aqueous systems include, but are not limited to, systems used in petroleum production and oil recovery (e.g., well casing transport pipelines), as well as refining, geothermal wells, and other oilfield applications; boilers and boiler water systems; systems used in power generation, mineral process water including mineral washing, flotation, and beneficiation; digesters, washers, bleaching plants, white water systems, and pulverizer water systems in paper mills; black liquor evaporators in the pulp industry; gas scrubbers and air washers; continuous casting processes in the metallurgical industry; air conditioning and refrigeration systems; building fire-fighting heating water, e.g., sterilized water; water reuse and purification systems; membrane filtration water systems; food processing lines and waste treatment systems, as well as purifiers, liquid-solid applications, and urban wastewater treatment systems; and systems used in industrial or urban water distribution systems. 【0082】 In some embodiments, the aqueous system may be a cooling system, a boiler system, a heating system, a membrane system, a papermaking system, a food and beverage system, a petroleum and gas system, or any system containing water. 【0083】 In certain aspects of this disclosure, inhibitor compositions may be used in conjunction with dishwashing compositions. Dishwashing compositions may be used to protect articles such as glassware or silverware from corrosion in a dishwasher or dishwashing machine. However, it should be understood that dishwashing compositions containing the inhibitor compositions of this disclosure may be available for use in clean environments other than the interior of a dishwasher or dishwashing machine. 【0084】 In certain embodiments, the disclosed inhibitor composition may have one or more of the following characteristics: Halogen stability up to approximately 0.5 ppm of free residual chlorine (FRC), Capable of handling water temperatures up to approximately 100°C. Compatibility with azoles, dispersants, and cooling water polymers, Calcium tolerance up to approximately 500 ppm as CaCO3. Chloride tolerance up to approximately 600 ppm as Cl. Stability across a pH range of approximately 6 to 9. Low toxicity (e.g., LC) 50 >100 mg / L), and Stable across a holding time index (HTI) ranging from a few seconds to approximately 5 years. 【0085】 In some embodiments, the temperature of the aqueous medium may be between about 4°C and about 100°C. In a pressurized closed-loop system, the water temperature may exceed about 100°C, and the compositions of this disclosure can be used at such temperatures. 【0086】 Any of the aqueous systems described herein can be automatically monitored and controlled. For example, the pH of the system can be monitored and controlled, or the amount of inhibitory composition in the aqueous system can be monitored and controlled. 【0087】 The disclosure also describes online units and systems for measuring, controlling, and / or optimizing one or more system parameters or properties of water. Optimization may include, for example, measuring one or more properties related to water to ensure that one or more properties are within a predetermined acceptable range, and if one or more properties are not within a predetermined acceptable range, measuring a predetermined range for each property and causing a change in the water to bring the properties back within a predetermined acceptable range. 【0088】 In certain embodiments, the system includes a monitoring and control unit comprising a controller and a plurality of sensors. Each of the sensors may be in communication with the controller. For example, if the unit comprises five sensors, each of the five sensors may be in communication with the controller. In certain embodiments, the controller may be mounted on a skid or other type of support member so as to be movable. 【0089】 As used herein, the term "controller" means a manual operator or electronic device having components such as a processor, memory device, digital storage medium, communication interface including communication circuitry capable of supporting any number of communication protocols and / or network-based communications, user interface (a graphical user interface which may include, for example, a cathode ray tube, liquid crystal display, plasma display, touchscreen, or other monitor), and / or other components. 【0090】 The controller is preferably operable to integrate with one or more application-specific integrated circuits, programs, computer executable instructions or algorithms, one or more hardwired devices, wireless devices, and / or one or more mechanical devices. Furthermore, the controller is operable to integrate the feedback, feedforward, and / or predictive loops(s) of the present invention. Some or all of the controller system functions may be located in a central position, such as a network server, for communications in a local area network, wide area network, wireless network, internet connection, microwave link, infrared link, wired network (e.g., Ethernet®). Furthermore, other components such as signal regulators or system monitors may be included to facilitate signal transmission and signal processing algorithms. 【0091】 In certain embodiments, the controller includes hierarchical logic for prioritizing any measured or predicted characteristics related to system parameters. For example, the controller may be programmed to prioritize the system's pH over conductivity, or vice versa. The purpose of such hierarchical logic should be understood as enabling improved control over system parameters and avoiding cyclical control loops. 【0092】 In some embodiments, the monitoring and control unit and related methods include an automatic controller. In some embodiments, the controller is manual or semi-manual. For example, if the system includes one or more data sets received from various sensors within the system, the controller can automatically determine which data points / data sets to process further, or an operator can make such a decision partially or completely. For example, a data set of an industrial body of water may include variables or system parameters such as oxidation / reduction potential (ORP), dissolved oxygen (DO), conductivity, pH, turbidity, concentrations of specific chemicals such as biocides, scale inhibitors, friction reducers, acids, bases and / or deoxidizers, ion levels (e.g., determined empirically, automatically, fluorescently, electrochemically, colorimetrically, directly measured, and calculated), temperature, pressure, flow rate, total dissolved or suspended solids. Such system parameters are typically measured by any type of suitable data acquisition equipment, such as sensors specifically designed for these parameters, e.g., pH sensors, ion analyzers, temperature sensors, thermocouples, pressure sensors, corrosion probes, and / or any other suitable devices or sensors. The data acquisition equipment is preferably in communication with a controller and, according to some embodiments, may have advanced functions provided by the controller (including any part of the control algorithms described herein). 【0093】 The monitoring and control unit may comprise multiple sensors capable of analyzing water and transmitting data related to the water to a controller. These sensors may, for example, be for measuring conductivity, pH, ORP, biocide concentration, turbidity, temperature, flow rate, and DO in water. The monitoring and control unit may comprise any of these sensors, all of these sensors, a combination of two or more of these sensors, or one or more further sensors not specifically mentioned herein, and the sensors may be in communication with the controller. Other types of sensors contemplated in this disclosure include, but are not limited to, oil-in-water sensors, total dissolved solids sensors, and total suspended solids sensors. 【0094】 The monitoring and control system of this disclosure comprises, in certain embodiments, one or more chemical injection pumps. Each chemical injection pump may be in fluid communication with a storage device. Each storage device may contain one or more chemicals, and the chemical injection pumps can transport these chemicals into a water mass. In some embodiments, the chemical injection pumps are provided with storage devices. The chemical injection pumps may be in communication with a controller by any means, such as wired, wireless, electronic, cellular, infrared, satellite, or any other type of communication network, topology, protocol, standard, etc. Thus, the controller can send signals to the pumps to control the rate at which they supply the chemicals. 【0095】 In certain embodiments, the monitoring and control system is implemented such that multiple sensors provide continuous or intermittent feedback, feedforward, and / or predictive information to a controller, which can relay this information to a relay device such as a Nalco Global Gateway, which can transmit this information via cellular communication to a remote device such as a mobile phone, computer, and / or any other device capable of receiving cellular communication. The remote device can interpret the information and automatically send signals (e.g., electronic commands) back to the controller via the relay device, causing the controller to make specific adjustments to the pump output. This information may also be processed internally by the controller, which can automatically send signals to pumps, for example, to adjust the amount of chemical injected. Based on the information received by the controller from multiple sensors or remote devices, the controller can transmit signals to various pumps to automatically adjust the amount of chemical the pumps are injecting into the water in real time. 【0096】 Alternatively, an operator of a remote device receiving cellular communication from the controller can manually operate the pumps through the remote device. The operator can transmit instructions to the controller via the remote device, either cellularly or by other means, and the controller can adjust the chemical addition rate of the chemical injection pumps. For example, the operator can receive signals or warnings from the remote device via cellular communication from the controller and use the remote device to send instructions or signals back to the controller to turn on one or more chemical injection pumps, turn off one or more chemical injection pumps, increase or decrease the amount of chemical added to the water by one or more injection pumps, or any combination thereof. The controller and / or remote device can also automatically perform any of the aforementioned adjustments or modifications without the operator actually sending or inputting instructions. Pre-configured parameters or programs are input to the controller or remote device so that the controller or remote device can determine whether the measured characteristics are outside the acceptable range. Based on information received by multiple sensors, the controller or remote device can appropriately adjust the pumps or send appropriate warnings. [Examples] 【0097】 The pilot closed-loop test apparatus included a coupon rack constructed on a recirculating water bath. The water bath had an operating temperature range of approximately -30°C to 200°C, depending on the circulating medium used. Typically, the test temperature was approximately 10°C, 60°C, or 80°C to simulate both the cooling and heating loops. The performance of the corrosion inhibitor was evaluated by metal coupon testing or online electrochemical methods (linear polarization resistance). 【0098】 The performance of the corrosion inhibitors was also evaluated using agitation and stagnant jar tests. In these tests, mild steel coupons were submerged in water for a set period of time. The coupons were then removed from the jar and inspected for weight loss. 【0099】 For most tests, three water matrices were used. Tap water from Naperville, Illinois (W1) is low in corrosive stress due to its relatively high calcium and alkalinity and low concentrations of corrosive ions such as chloride and sulfate. To increase the corrosivity of the water and stress the corrosion inhibitors, additional chloride (sodium chloride) and sulfate (sodium sulfate) were added to Naperville tap water to reach approximately 150 ppm chloride and approximately 200 ppm sulfate (W2). Typically, tests were conducted at approximately 60°C using W2 to test the performance of the newly developed formulations for their robustness. A chloride concentration of approximately 150 ppm and a sulfate concentration of approximately 200 ppm would correspond to 80% of US makeup water. A third water matrix was used to simulate makeup water typically used in closed-loop cooling water applications (W3). A summary of the water used in these experiments is shown in Table 1. [Table 1] 【0100】 Example 1 The results of the jar tests are shown in Tables 2 and 3. Items 1-12 describe a series of experiments investigating the dose profiles of closed-loop corrosion inhibitor packages in two different waters using mild steel coupons at approximately 60°C. The components investigated in these experiments were polymaleic acid (approximately 82-410 ppm), tolyltriazole sodium (approximately 10-52 ppm), dispersant (polyacrylic acid copolymer with AMPS, approximately 3-15 ppm), SiO2 (approximately 16-79 ppm), and sodium carbonate (approximately 23-114 ppm). The two waters used in the experiments were W2 and W3. The results show that polymaleic acid, the primary mild steel corrosion inhibitor, can reduce mild steel corrosion at a low dose of approximately 82 ppm in both W2 and W3. Items 1 and 7 are control experiments without the addition of corrosion inhibitor components. Items 13-18 show that the individual components without PMA are not acceptable corrosion inhibitors. 【0101】 Items 19-24 compared the performance of the compositions in this application (items 19 and 22) against existing corrosion inhibitors based on molybdate and nitrite at two different pH values. At pH 9, which represents a typical pH encountered in closed-loop applications, item 19 performed better than the molybdate-based corrosion inhibitor (item 20) and was comparable in performance to the nitrite-based corrosion inhibitor (item 21). At pH 7.5, the nitrite-based corrosion inhibitor provided excellent corrosion inhibition (item 24), while both item 22 and the molybdate-based corrosion inhibitor (item 23) provided insufficient corrosion inhibition. PMA is polymaleic acid, Na TT is tolyltriazole sodium, Disp. is a copolymer of polyacrylic acid and AMPS, Na PAA is sodium polyacrylate, TEA is triethanolamine, and Na BZT is benzotriazole sodium. Amounts in the table are ppm unless otherwise specified. RT refers to room temperature, which is estimated to be around 20°C. [Table 2] [Table 3] 【0102】 Example 2 Table 4 shows the results of the closed-loop test. Items 1-3 show the corrosion inhibition results of the polymaleic acid-based carbonate buffer corrosion inhibitor composition. Items 1 and 2 show good corrosion inhibitory performance at different concentrations of sodium carbonate (115, 204 ppm). Item 3 shows that the composition is effective even in the absence of SiO2. Item 4 shows the corrosion inhibitory performance of the current nitrite-based corrosion inhibitor. The nitrite-based corrosion inhibitor exhibits good performance, demonstrating the effectiveness of the test method. Items 6-8 demonstrate the effectiveness of using TEA as a buffer instead of sodium carbonate. Item 6 shows that the TEA-containing composition can effectively inhibit mild steel corrosion at approximately 80°C and pH 7.3 in W2. Item 8 shows good performance of the PMA-based TEA buffer composition at approximately 80°C and in W1. N-methyl is N-methylimidazole. AB is Admiralty brass. [Table 4] 【0103】 Example 3 Hydrolyzed polymaleic acid (HPMA), a compound of formulas (III) to (VI), was tested for corrosion control of aluminum alloys. HPMA provides excellent protection to certain aluminum alloys, including Al1100 and Al6061. Surprisingly, it also provides excellent corrosion protection to mild steel coupons even at approximately 80°C in water W1. Further testing of HPMA in water W2 at approximately 80°C demonstrated excellent corrosion control of mild steel. HPMA is sufficiently effective to replace molybdates and nitrites for corrosion control of mild steel in closed-loop applications. 【0104】 A formulation of HPMA was prepared containing approximately 17% by weight of HPMA, approximately 63% by weight of TEA, and approximately 1.7% by weight of TT. Water W1 was used at a pH of approximately 7.9 and a temperature of approximately 80°C. The concentration of HPMA in the water containing the metal test coupon was approximately 375 ppm. The concentration of TEA was approximately 1583 ppm. The concentration of TT was approximately 42 ppm. 【0105】 The results showed that after approximately 6 days, the corrosion rate of the mild steel coupon was approximately 0.4 mpy, copper was 0.0 mpy, Admiralty metal was approximately 0.0 mpy, and Al1100 was approximately 4.8 mpy. 【0106】 Another formulation of HPMA was prepared containing approximately 18% by weight of HPMA, approximately 56% by weight of TEA, and approximately 3% by weight of TT. Water W2 was used at a pH of approximately 7.45 to approximately 7.57 and a temperature of approximately 80°C. The concentration of HPMA in the water containing the metal test coupon was approximately 440 ppm. The concentration of TEA was approximately 1412 ppm. The concentration of TT was approximately 75 ppm. The concentration of the dispersant was approximately 10 ppm. 【0107】 The results showed that after approximately two weeks, the corrosion rates were approximately 0.53 mpy for mild steel coupons, 0.05 mpy for copper, 0.74 mpy for Al6061, and 0.6 mpy for Al1100. 【0108】 Example 4 A formulation of HPMA was prepared containing approximately 21% by weight of HPMA, approximately 10% by weight of NaOH, approximately 3.6% by weight of TT, approximately 2.75% by weight of mercaptobenzothiazole, and approximately 5.4% by weight of Na2SiO3.5H2O. Water W1 was used at a pH of approximately 9.4 to approximately 10.5 and a temperature of approximately 25°C. The concentration of HPMA in the water containing the metal test coupon was approximately 520 ppm. The concentration of TT was approximately 90 ppm. The concentration of mercaptobenzothiazole was approximately 69 ppm. The concentration of Na2SiO3.5H2O was approximately 135 ppm. 【0109】 The results showed that after approximately 24 days, the formulation provided protection for mild steel, copper, Admiralty metal, galvanized steel, and Al7075. Another test using the same formulation at 80°C with a pH of approximately 9.11–10.32 showed good protection for mild steel, copper, Al6061, Al1100, and galvanized steel. 【0110】 Example 5 A polymaleic acid (PMA) formulation containing PMA, NaOH, TEA, TT, a dispersant, water, and NaNO3 was prepared. The concentration of PMA in water containing a metal test coupon was approximately 500 ppm. The concentration of TEA was approximately 600 ppm. The concentration of TT was approximately 84 ppm. The concentration of the dispersant was approximately 13.5 ppm. The concentration of NaNO3 was approximately 801 ppm. 【0111】 The results showed very good protection for galvanically bonded Al7075 containing yellow metal. Mild steel and yellow metal coupons were also adequately protected. In W2 water at 60°C, the formulation protected Al360. 【0112】 Example 6 A compound of polyepoxysuccinic acid (PESA) containing PESA, water, TEA, TT, a dispersant, and Na2SiO3.5H2O was prepared. The W2 water was used at a temperature of approximately 60°C. The concentration of PESA in water containing a metal test coupon was approximately 2500 ppm. 【0113】 The results showed very good protection for mild steel and copper. 【0114】 Any composition disclosed herein may contain, consist of, or essentially consist of any of the compounds / components disclosed herein. According to this disclosure, phrases such as “consist essentially of,” “consists essentially of,” and “consisting essentially of” limit the claims to any particular material or step and any material or step that does not substantially affect the basic and novel features of the claimed invention. 【0115】 As used herein, the term “approximately” means a cited value that is within the error resulting from the standard deviation observed in each of those test measurements, and if those errors cannot be determined, “approximately” means within 10% of the cited value. 【0116】 All compositions and methods disclosed and claimed herein can be prepared and performed without undue experimentation, taking into consideration this disclosure. The present invention can be embodied in many different forms, and certain preferred embodiments of the present invention are described in detail herein. This disclosure is illustrative of the principles of the present invention and is not intended to limit the present invention to the specific embodiments illustrated. Furthermore, unless expressly stated otherwise, the use of the term “one (a)” is intended to include “at least one” or “one or more.” For example, “one polymer” is intended to include “at least one polymer” or “one or more polymers.” 【0117】 Any range given by either an absolute or approximate term is intended to encompass both, and any definitions used herein are intended to clarify, not limit. Numerical ranges and parameters that specify the broad scope of the invention are approximate, but the numerical values ​​specified in specific examples are reported as accurately as possible. However, any numerical value inherently contains a certain error that inevitably results from the standard deviation observed in their respective test measurements. Furthermore, all ranges disclosed herein should be understood to encompass all subranges contained therein (including all decimal values ​​and whole values). 【0118】 Furthermore, the present invention encompasses all possible combinations of some or all of the various embodiments described herein. It should also be understood that various changes and modifications to the preferred embodiments of the present invention described herein will be obvious to those skilled in the art. Such changes and modifications may be made without departing from the spirit and scope of the invention and without diminishing its intended advantages. Accordingly, such changes and modifications are intended to be covered by the appended claims. Examples of embodiments of the present disclosure are listed in the following items [1] to

[20] . [1] A method for suppressing corrosion of a metal surface in contact with an aqueous medium, wherein the method is: The method includes bringing the metal surface into contact with a corrosion inhibitor composition within a closed-loop system, wherein the corrosion inhibitor composition comprises a compound of formula (I) or a salt thereof. [ka] In the formula, L is either a single bond or a double bond. R 1 However, hydrogen, -CH 2 -COOH, [ka] And n is an integer between 1 and 100, m is an integer between 1 and 100, and p is an integer between 2 and 20. R 3 However, -OH, -OCH 3 aryl group, or C 1 ~C 4 It is alkyl, and R 2 However, hydrogen, -OH, -OCH 3 aryl group, or C 1 ~C 4 A method that is alkyl. [2] R 1 but, 【change】 The method described in item 1. [3] R 1 but, 【change】 And L is a double bond, and R 2 However, the method described in item 1 is hydrogen. [4] R 1 but, 【change】 And R 2 However, the method described in item 1, which is -OH. [5] The method according to any one of items 1 to 4, wherein the corrosion inhibitor composition further comprises a non-borate buffer. [6] The method according to any one of items 1 to 5, wherein the corrosion inhibitor composition further comprises a nitrate. [7] The method according to item 5 or 6, wherein the buffer is triethanolamine (TEA), morpholine, N-methylimidazole, 1,4-diazabicyclo[2.2.2]octane, quinuclidine, urotropin, imidazole, methylimidazole, p-phenolsulfonate, diethylethanolamine, methoxypropylamine, diethylenetriamine, triethylenetetramine, borate, phosphate, bicine, glycine, or any combination thereof. [8] The method according to item 5 or 6, wherein the buffer is a carbonate buffer. [9] The method according to any one of items 1 to 8, wherein the corrosion inhibitor composition further comprises a silicate.

[10] The method according to any one of items 1 to 9, wherein the corrosion inhibitor composition further comprises an azole selected from the group consisting of tritriazole (TT), benzotriazole (BZT), meceptbenzosadil (MBT), butylbenzotriazole (BBT), halogen-resistant azole (HRA), benzimidazole, and any combination thereof.

[11] The method according to item 10, wherein azole is TT.

[12] The method according to any one of items 1 to 11, wherein the corrosion inhibitor composition further comprises water.

[13] The method according to any one of items 1 to 12, wherein the aqueous medium has a pH of about 6 to about 12.

[14] The method according to any one of items 1 to 13, wherein the corrosion inhibitor composition does not contain at least one of nitrite, phosphorus, borate, or molybdate.

[15] The method according to any one of items 1 to 12, further comprising adding the corrosion inhibitor composition to the aqueous medium at a concentration of the compound of formula I ranging from approximately 10 ppm to approximately 50,000 ppm.

[16] The method according to any one of items 9 to 15, wherein the corrosion inhibitor composition comprises about 1% to about 99% by weight of the compound of formula (I) or a salt thereof, about 0.5% to about 90% by weight of the silicate, and about 0.5% to about 20% by weight of the buffer.

[17] The method according to any one of items 1 to 16, wherein the metal surface includes mild steel, copper, copper alloys, iron, iron alloys, Admiralty brass, about 90% copper and about 10% nickel, about 80% copper and about 20% nickel, about 70% copper and about 30% nickel, aluminum, aluminum alloys, aluminum brass, manganese brass, leaded naval bronze, phosphor bronze, galvanized steel, and any combination thereof.

[18] A corrosion inhibitor composition comprising a silicate, a buffer, and a compound of formula (I) or a salt thereof, 【change】 In the formula, L is either a single bond or a double bond. R 1 However, hydrogen, -CH 2 -COOH, 【change】 And n is an integer between 1 and 100, m is an integer between 1 and 100, and p is an integer between 2 and 20. R 3 However, -OH, -OCH 3 aryl group, or C 1 ~C 4 It is alkyl, and R 2 However, hydrogen, -OH, -OCH 3 aryl group, or C 1 ~C 4 A corrosion inhibitor composition that is alkyl.

[19] The corrosion inhibitor composition according to item 18, further comprising an azole selected from the group consisting of TT, BZT, MBT, BBT, HRA, benzimidazole, and any combination thereof.

[20] Use of a corrosion inhibitor composition for suppressing corrosion of a metal surface in contact with an aqueous medium, wherein the corrosion inhibitor composition comprises a compound of formula (I) or a salt thereof, a silicate, and a buffering agent.

Claims

[Claim 1] A method for suppressing corrosion of a metal surface in contact with an aqueous medium, wherein the method is: The method comprises bringing the metal surface into contact with a corrosion inhibitor composition within a closed-loop system, wherein the corrosion inhibitor composition comprises a silicate, a non-borate buffer, and a compound of formula (I) or a salt thereof. 【Chemistry 1】 In the formula, L is either a single bond or a double bond. R １ but, 【Chemistry 2】 And m is an integer between 1 and 100, and p is an integer between 2 and 20. R ３ , -OH, -OCH ３ aryl group, or C １ ~C ４ It is alkyl, and R ２ is hydrogen, -OH, -OCH ３ , an aryl group, or C １ ~C ４ alkyl, and The corrosion inhibitor composition is free of phosphorus and tin. [Claim 2] R １ but, 【Transformation 3】 The method according to claim 1. [Claim 3] R １ but, 【Chemistry 4】 And L is a double bond, and R ２ The method according to claim 1, wherein the substance is hydrogen. [Claim 4] R ２ The method according to claim 1, wherein the compound is -OH. [Claim 5] The method according to any one of claims 1 to 4, wherein the corrosion inhibitor composition further comprises a nitrate. [Claim 6] The method according to claim 5, wherein the non-borate buffer is triethanolamine (TEA), morpholine, N-methylimidazole, 1,4-diazabicyclo[2.2.2]octane, quinuclidine, urotropin, imidazole, methylimidazole, p-phenolsulfonate, diethylethanolamine, methoxypropylamine, diethylenetriamine, triethylenetetramine, bicine, glycine, or any combination thereof. [Claim 7] The method according to any one of claims 1 to 5, wherein the non-borate buffer is a carbonate buffer. [Claim 8] The method according to any one of claims 1 to 7, wherein the corrosion inhibitor composition further comprises an azole selected from the group consisting of tritriazole (TT), benzotriazole (BZT), mercaptobenzothiazole (MBT), butylbenzotriazole (BBT), halogen-resistant azole (HRA), benzimidazole, and any combination thereof. [Claim 9] The method according to claim 8, wherein the azole is TT. [Claim 10] The method according to any one of claims 1 to 9, wherein the corrosion inhibitor composition further comprises water. [Claim 11] The method according to any one of claims 1 to 10, wherein the aqueous medium has a pH of about 6 to about 12. [Claim 12] The method according to any one of claims 1 to 11, wherein the corrosion inhibitor composition does not contain at least one of nitrite, borate, or molybdate. [Claim 13] The method according to any one of claims 1 to 10, further comprising adding the corrosion inhibitor composition to the aqueous medium at a concentration of the compound of formula I ranging from approximately 10 ppm to approximately 50,000 ppm. [Claim 14] The method according to claim 8 or 9, further comprising adding the corrosion inhibitor composition to the aqueous medium at a concentration of approximately 20 ppm to approximately 500 ppm of the azole. [Claim 15] The method according to any one of claims 1 to 14, wherein the corrosion inhibitor composition comprises about 1% to about 99% by weight of the compound of formula (I) or a salt thereof, about 0.5% to about 90% by weight of the silicate, and about 0.5% to about 20% by weight of the non-borate buffering agent. [Claim 16] The method according to any one of claims 1 to 15, wherein the metal surface includes mild steel, copper, copper alloys, iron, iron alloys, Admiralty brass, about 90% copper and about 10% nickel, about 80% copper and about 20% nickel, about 70% copper and about 30% nickel, aluminum, aluminum alloys, aluminum brass, manganese brass, leaded naval bronze, phosphor bronze, galvanized steel, and any combination thereof. [Claim 17] A corrosion inhibitor composition comprising a silicate, a non-borate buffer, and a compound of formula (I) or a salt thereof, 【Transformation 5】 In the formula, L is either a single bond or a double bond. R １ but, 【Transformation 6】 And m is an integer between 1 and 100, and p is an integer between 2 and 20. R ３ , -OH, -OCH ３ aryl group, or C １ ~C ４ It is alkyl, and R ２ However, hydrogen, -OH, -OCH ３ aryl group, or C １ ~C ４ It is alkyl, The corrosion inhibitor composition is a corrosion inhibitor composition that does not contain phosphorus and tin. [Claim 18] The corrosion inhibitor composition according to claim 17, further comprising an azole selected from the group consisting of TT, BZT, MBT, BBT, HRA, benzimidazole, and any combination thereof. [Claim 19] The use of a corrosion inhibitor composition for suppressing corrosion of a metal surface in contact with an aqueous medium, wherein the corrosion inhibitor composition comprises a compound of formula (I) or a salt thereof, a silicate, and a non-borate buffering agent. 【Transformation 7】 In the formula, L is either a single bond or a double bond. R １ but, 【Transformation 8】 And m is an integer between 1 and 100, and p is an integer between 2 and 20. R ３ , -OH, -OCH ３ aryl group, or C １ ~C ４ It is alkyl, and R ２ However, hydrogen, -OH, -OCH ３ aryl group, or C １ ~C ４ It is alkyl, The aforementioned corrosion inhibitor composition does not contain phosphorus and tin.

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