Corrosion inhibitor composition, and method and system for using the same.

Abstract

A corrosion inhibitor for non-ferrous metals comprises (i) a bio-chelating agent, (ii) a solvent, and (iii) at least one material selected from the group consisting essentially of ring openers, organic acids, general corrosion inhibitors, and combinations thereof. A method for reducing corrosion in a system comprising an industrial water and a metal surface comprises introducing a corrosion inhibitor composition to the system, the corrosion inhibitor composition comprising (i) a bio-chelating agent, (ii) a solvent, and (iii) at least one material selected from the group consisting essentially of ring openers, organic acids, general corrosion inhibitors, and combinations thereof.

Description

TECHNICAL FIELD

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This application claims priority to U.S. Provisional Patent Application No. 63 / 215,392, filed June 25, 2021, entitled "ALUMINUM CORROSION INHIBITORS AND METHODS OF USING SAME", and U.S. Provisional Patent Application No. 63 / 228,567, filed August 2, 2021, entitled "COMPOSITIONS AND METHODS FOR INHIBITING WHITE RUST", the entire disclosures of which are incorporated herein by reference for all purposes.

[0002] Water is inherently corrosive, as it tends to undergo reactions that release hydrogen atoms. In water-using systems, corrosion inhibitors are generally introduced into the system to extend the service life of system components such as pipes and conduits.

[0003] Corrosion is the result of a complex series of reactions. For example, corrosion can occur between water and metal surfaces (such as metal piping) or materials in which water is stored or transported. The corrosion process is an oxidation-reduction reaction that results in the conversion of refined or processed metals to a more stable state. Two major categories of non-ferrous metal-containing materials are aluminum-containing materials and zinc-containing materials.

[0004] Corrosion of aluminum-containing materials (e.g., aluminum alloys) is typically addressed by using soluble silicates (inorganic acid technology - IAT) in closed-loop cooling systems. IAT inhibitors were designed in an era when engines were primarily composed of iron alloys. To adequately suppress the corrosion of ferrous metals, IAT inhibitors are usually buffered to a pH range of 10-11 using borate buffers. Since this pH range is not optimal for inhibiting aluminum corrosion, such inhibitors often contained silicates, which are well-known aluminum corrosion inhibitors. However, when hard water is introduced into cooling systems treated with these inhibitors, calcium and magnesium silicates precipitate, creating harmful deposits and rendering the corrosion inhibitory effect ineffective. Modern internal combustion engines have a higher aluminum content and lower iron alloy content than older generations of engines, making aluminum corrosion inhibition relatively more important.

[0005] Another type of corrosion inhibitor for aluminum-containing materials utilizes organic acid technology (OAT) in a closed-loop system. OAT uses mixtures of aliphatic monobasic and dibasic acid salts, such as benzotriazole, mercaptobenzothiazole, toltriazole, and their derivatives, that have been found to be effective as corrosion inhibitors at high doses. These inhibitors are mixtures of monobasic and dibasic aliphatic acids, such as sebacic acid and heptanoic acid, and include buffers to control the pH of the composition within the range of 8-9. OAT inhibitors may also include inorganic components such as silicates and nitrites, which are referred to as "hybrid technologies." However, these hybrid technologies also suffer from adverse effects due to hard water precipitation and toxicity issues.

[0006] Another form of non-ferrous corrosion occurs in the aqueous corrosion of the zinc layer of galvanized steel. This results in a large amount of fracturing layer of corrosion products commonly known as "white rust." White rust is a white, calcium carbonate-like substance that forms on the surface of zinc materials such as galvanized steel. Common mechanisms to mitigate white rust formation include adjusting the chemical properties of the aqueous fluid in contact with the galvanized steel to conditions unsuitable for white rust formation. This mechanism to mitigate white rust formation is not optimal because it requires the possibility of continuous monitoring and adjustment of the fluid composition to ensure that conditions unsuitable for white rust formation are maintained.

[0007] There is a continuing demand for novel corrosion inhibitors for non-ferrous metal-containing materials that do not have the above-mentioned drawbacks. [Brief explanation of the drawing]

[0008] For a detailed description of the disclosed methods and systems, please refer to the attached drawings.

[0009] [Figure 1] Figure 1 is a graph showing the corrosion rate of the sample from Example 1 as a function of time.

[0010] [Figure 2] Figure 2 is a photograph of the test specimen exposed to the sample of Example 2. [Overview of the project]

[0011] This specification discloses corrosion inhibitors for nonferrous metals, comprising (i) a biochelating agent, (ii) a solvent, and (iii) at least one material selected from the group consisting of basically ring-opening agents, organic acids, general corrosion inhibitors, and combinations thereof.

[0012] This specification also discloses a method for reducing corrosion in a system having industrial water and metal surfaces, comprising introducing a corrosion inhibitor composition into the system, the composition comprising (i) a biochelating agent, (ii) a solvent, and (iii) at least one material selected from the group consisting of ring-opening agents, organic acids, general corrosion inhibitors, and combinations thereof.

[0013] Furthermore, this specification discloses a system comprising at least one metal surface, a corrosion inhibitor, and industrial water, wherein the corrosion inhibitor comprises a biochelating agent in an amount of about 0.5% to about 70% by weight relative to the total weight of the corrosion inhibitor, and the system comprises a boiler, a cooling tower, a cooling system, a closed-circulation cooling system, a dry cooling tower, an open-circulation system, or an internal combustion engine. [Modes for carrying out the invention]

[0014] To more clearly define the terms used herein, the following definitions are provided. Unless otherwise specified, the following definitions apply to this disclosure. If a term is used in this disclosure but is not specifically defined herein, the definition in IUPAC Compendium of Chemical Terminology, 2nd Ed (1997) may be applied, provided that the definition does not conflict with other disclosures or definitions applicable herein, or that it does not obscure or render unusable the claims to which the definition applies.

[0015] The element groups in the periodic table are represented using the numbering method shown in the version of the periodic table published in Chemical and Engineering News, 63(5), 27, 1985. For example, alkali metals are Group 1 elements, alkaline earth metals are Group 2 elements, transition metals are Groups 3-12 elements, and halogens are Group 17 elements.

[0016] Regarding transitional terms or phrases in claims, the transitional phrase "having," which is synonymous with "including," "containing," "equipping," or "characterized by," is comprehensive or open-ended and does not exclude additional, uncited elements or steps of a method. The transitional phrase "consisting of" excludes elements, steps, or components not specified in the claim. The transitional phrase "consisting essentially of" limits the scope of the claim to the specified materials or steps and those that do not materially affect the basic and novel features of the invention described in the claim. Claims "consisting essentially of" occupy an intermediate position between closed claims written in the "consisting only of" form and fully open claims written in the "having" form. Unless otherwise specified, when describing a compound or composition, "consisting essentially of" is not to be interpreted as "having," but is intended to refer to described components, including materials, that do not materially alter the composition or method to which the term applies. Where a composition and method is described using the term "having" various components or steps, the composition and method may also "become" or "become" of various components or steps.

[0017] Disclosed herein are corrosion inhibitors for non-ferrous metal-containing materials exposed to fluids such as aqueous fluids. In some embodiments, the compositions disclosed herein generally reduce the amount of material deposited on and / or the chemical alteration of metal-containing surfaces. In one or more embodiments, the metal-containing surface is a component of equipment, and corrosion is detrimental to the equipment and / or the way the equipment is used.

[0018] In one embodiment, the metal-containing surface contains zinc. In another embodiment, the metal-containing surface contains aluminum. Here, a corrosion inhibitor composition formulated to reduce corrosion of a zinc-containing surface (e.g., galvanized steel) is called a zinc corrosion inhibitor composition and is referred to as CIC-Zn. Here, a corrosion inhibitor composition formulated to reduce corrosion of an aluminum-containing surface (e.g., an aluminum alloy) is called an aluminum corrosion inhibitor composition and is referred to as CIC-Al.

[0019] In one embodiment, the corrosion inhibitors disclosed herein reduce corrosion of metal-containing surfaces exposed to aqueous fluids. In one embodiment, the aqueous fluid includes industrial water. In this embodiment, “industrial water” means water used in industrial operations such as the manufacture, processing, cleaning, dilution, cooling, or transport of products, the incorporation of water into products, or for sanitary purposes. In one embodiment, industrial water is feedwater, which is water used in boilers and cooling towers for purposes such as ensuring or improving efficiency, maximizing the lifespan of boilers and systems, reducing maintenance costs, and maintaining operational performance. In one or more embodiments, industrial water is present in cooling systems such as once-through cooling systems, closed-circulation cooling systems, and dry cooling towers, or in open-circulation systems such as wet cooling towers and evaporative cooling towers. In another embodiment, industrial water facilitates the cooling of modern internal combustion engines.

[0020] In some embodiments, CIC-Al and CIC-Zn contain a chelating agent. Here, a chelating agent, also called a sequestering agent, chelating drug, or sequestering agent, refers to a molecule that can bond with or complex with a metal. A chelating agent is characterized as a ligand containing two or more electron-donating groups, and multiple bonds are formed between the atoms on each electron-donating group of the ligand and the metal. These bonds can be coordinate bonds or coordinate covalent bonds, meaning that each electronegative atom provides both electrons to form a bond to the metal center. In some embodiments, the chelating agent is a biochelating agent. Here, the term "biochelating agent" refers to a molecule that can chelate a metal as described above, and is (i) derived from natural resources, (ii) biodegradable, or both.

[0021] In one embodiment, the biochelating agent contains an aldonic acid, a uronic acid, an aldalic acid, or a combination thereof, and a countercation. For example, the biochelating agent may be a mixture of an aldalic acid, a uronic acid, and their respective countercations.

[0022] In another aspect, the biochelating agent consists of a glucose oxidation product, a gluconic acid oxidation product, a gluconate, or a combination thereof. The glucose oxidation product, gluconic acid oxidation product, or combination thereof may be buffered to a suitable pH.

[0023] Additionally or alternatively, in one or more aspects, the biochelating agent contains glucaric acid, gluconic acid, glucuronic acid, a glucose oxidation product, a gluconic acid oxidation product, or a combination thereof. Additionally or alternatively, in one or more aspects, the biochelating agent contains a disaccharide, an oxidized disaccharide, a uronic acid, an aldaric acid, or a combination thereof.

[0024] Additionally or alternatively, in one or more aspects, the biochelating agent contains gluconic acid, glucaric acid, glucuronic acid, an n-keto acid, a C2 to C6 diacid, or a combination thereof.

[0025] Additionally or alternatively, in one or more aspects, the biochelating agent contains an oxidation product having galactonic acid, galactaric acid, galactonic acid and / or galactaric acid as a main component (for example, greater than about 50% by weight) and an n-keto acid, a C2 to C6 diacid, or a combination thereof as an auxiliary component. Additionally or alternatively, in one or more aspects, the biochelating agent comprises glutamic acid. Additionally or alternatively, in one or more aspects, the biochelating agent contains glucodialdose, 2-ketoglucose, or a combination thereof.

[0026] In such an aspect, the buffered glucose oxidation product, buffered gluconic acid oxidation product, or combination thereof is buffered to a suitable pH. For example, the glucose oxidation product, gluconic acid oxidation product, or combination thereof may be buffered to a pH of about 1 to about 5. Buffering of the chelating agent can be performed using any suitable acid, base, or combination thereof.

[0027] In one or more embodiments, any biochelating agent or combination of biochelating agents disclosed herein may further comprise a countercation such as a Group 1 alkali metal, Group 2 alkaline earth metal, Group 8 metal, Group 11 metal, Group 12 metal, or combinations thereof. For example, the countercation may contain silicate, borate, aluminum, calcium, magnesium, ammonium, sodium, potassium, cesium, strontium, zinc, copper, ferric iron, ferrous iron, or combinations thereof.

[0028] In certain embodiments, the biochelating agent comprises a glucose oxidation product, a gluconic acid oxidation product, gluconate, glucaric acid, oxidized glucuronolactone, a uronic acid oxidation product, or a combination thereof. Alternatively, the biochelating agent comprises a buffered glucose oxidation product, a buffered gluconic acid oxidation product, or a combination thereof. In such embodiments, the buffered glucose oxidation product, buffered gluconic acid oxidation product, or combination thereof is buffered to a pH within the ranges disclosed herein using any suitable acid or base, such as sodium hydroxide. In one example of such an embodiment, the biochelating agent comprises a mixture of gluconic acid and glucaric acid, and further comprises secondary components consisting of n-keto acids, C2 to C6 diacids, or combinations thereof. In certain embodiments, the biochelating agent consists of the metal chelate product commercially available as BIOCHELATE™ from Solugen, Inc. of Houston, Texas.

[0029] In various embodiments, the chelating agent may be present in a corrosion inhibitor composition of the type disclosed herein (e.g., CIC-Al or CIC-Zn) in an amount of from about 0.5 weight percent (wt%) to about 70 weight percent, about 5 weight percent to about 50 weight percent, about 10 weight percent to about 60 weight percent, about 0.5 weight percent to about 10 weight percent, or about 20 weight percent to about 70 weight percent, based on the total weight of the corrosion inhibitor composition. All weight percentages herein are based on the total weight of the recited composition unless otherwise specified.

[0030] In one or more embodiments, the corrosion inhibitor compositions of the Disclosure may exclude the use of chelating agents other than those disclosed herein as biochelating agents. Furthermore, in one or more other embodiments, the corrosion inhibitors of the Disclosure may exclude the use of other compounds known to function as corrosion inhibitors (referred to herein as “general corrosion inhibitors”).

[0031] In one embodiment, a general corrosion inhibitor comprises a heterocyclic organic compound, a molybdate, a phosphate, or a combination thereof.

[0032] In one embodiment, common corrosion inhibitors consist of heterocyclic organic compounds, thiazoles, triazoles, or combinations thereof. Thiazoles and triazoles are 5-atom aromatic ring molecules containing a nitrogen atom and at least one other nitrogen, oxygen, or sulfur atom as part of the ring. Azole compounds are broadly classified into three types: N-, N&O-, and N&S-containing azole sets.

[0033] In one embodiment, conventional corrosion inhibitors include imidazole, pyrazole, 1,2,3-triazole, 1,2,4-triazole, tetrazol, oxazole, isoxazole, 1,2,4-oxadiazole, 1,3,4-oxadiazole, thiazole, 1,2,4-thiadiazole, mercaptobenzothiazole, mercaptobenzimidazole, butylbenzotriazole, 1,3,4-thiadiazole, benzotriazole, tolyltriazole, (2-pyrrolecarbonyl)benzotriazole, (2-thienylcarbonyl)benzotriazole, amino-1,2,4-triazole, diamino-1,2,4-triazole, mercapto-1H-1,2,4-triazole, methyl-2-phenylimidazole, amino-3-hydrazino-5-mercapto-1,2,4-triazole, phenyl-1-H-tetrazol, chlorotolyltriazole, derivatives thereof, or combinations thereof.

[0034] In one embodiment, the general corrosion inhibitor contains a molybdate. For example, the general corrosion inhibitor may contain a molybdate (including heteropolymolybdate). In another embodiment, the general corrosion inhibitor contains an alkali metal salt of molybdate.

[0035] In one embodiment, common corrosion inhibitors are phosphorus-containing compounds. Non-limiting examples of phosphorus-containing compounds suitable for use in this disclosure include aminotrimethylenephosphonic acid (ATMP), 1-hydroxyethylidene-1,1-diphosphonic acid (HEDP), hydrolyzed polymaleic anhydride (HPMA), 2-hydrophosphonocarboxylic acid (HPAA), polyaminopolyetherphosphonate (PAPEMP), aminoethylethanolamine (AEEA), diethylenetriaminepenta (DTPMP), bis(hexamethylenetriaminepenta(methylenephosphonic acid)) (BHMT), diethylenetriaminepenta(methylenephosphonic acid)) (BTPMP), 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTC), and anionic polymers or copolymers incorporating phosphorus functional groups into polymer chains.

[0036] In some embodiments, the corrosion inhibitor compositions of this disclosure may include the use of a chelating agent disclosed herein as a biochelating agent in combination with any common corrosion inhibitor. In some embodiments, the common corrosion inhibitor is present in the corrosion inhibitor composition in an amount of about 0.5% to about 60% by weight, about 5% to about 50% by weight, about 10% to about 60% by weight, or about 0.5% to about 10% by weight.

[0037] In one embodiment, the corrosion inhibitor is CIC-Al, which reduces the amount of corrosion occurring on surfaces made of aluminum and / or aluminum alloys. In such embodiments, in addition to a biochelating agent and an optionally selected general corrosion inhibitor, CIC-Al further comprises a solvent and at least one material selected from the group consisting of a ring-opening agent, an organic acid, or a combination thereof.

[0038] In one embodiment, the CIC-Al of this disclosure includes a ring-opening agent. While not intended to be limited by theory, the biochelating agents disclosed herein exist in equilibrium between the carboxylic acid and lactone forms of the disclosed compounds. The carboxylic acid form of the disclosed biochelating agents plays a role in chelating metal ions that act to corrode metal surfaces of the type disclosed herein. When a ring-opening agent binds to a linear biochelating agent, it retains the linear biochelating agent and shifts the equilibrium to decrease or minimize the lactone biochelating agent. The equilibrium shift caused by the ring-opening agent increases the amount of biochelating agent available to coordinate cations that contribute to corrosion.

[0039] In one embodiment, the ring-opening agent is a lanthanide-containing compound. Lanthanides suitable for use in this disclosure are any member of the lanthanide system, e.g., lanthanum (La), cerium (Ce), praseodymium (Pr), neodymium (Nd), promethium (Pm), samarium (Sm), europium (Eu), gadolinium (Gd), terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm), ytterbium (Yb), and lutetium (Lu). In one embodiment, the oxidation state of the lanthanides described herein is +3, e.g., Nd(II), Pm(II), Eu(II), Gd(II), Tb(II), Dy(II), Ho(II), Er(II), Tm(II), Yb(II), or Lu(II). In one embodiment, the oxidation state of the lanthanides described herein is +3, for example, Nd(III), Pm(III), Eu(III), Gd(III), Tb(III), Dy(III), Ho(III), Er(III), Tm(III), Yb(III), or Lu(III). In one embodiment, the lanthanides associate with anions to form lanthanide salts.

[0040] In one embodiment, the ring-opening agent is aluminic acid (AlO2 - In one or more embodiments, the ring-opening agent is an aluminate such as an alkali metal salt or an alkaline earth metal salt.

[0041] In some embodiments, the ring-opening agent is present in CIC-Al in amounts of about 0.01% to about 80% by weight, about 10% to about 80% by weight, about 5% to about 20% by weight, or about 0.01% to about 5% by weight, relative to the total weight of the composition.

[0042] In one embodiment, the CIC-Al of this disclosure contains an organic acid, where an organic acid is a weakly acidic organic compound that does not completely dissociate in water. Generally, any organic acid that is compatible with the other components of CIC-Al and can provide an acidic species is available. Non-limiting examples of organic acids suitable for use in this disclosure include citric acid, lactic acid, acetic acid, formic acid, oxalic acid, uric acid, malic acid, tartaric acid, and combinations thereof.

[0043] In some embodiments, organic acids are present in CIC-Al in amounts of approximately 0.01% to approximately 70% by weight, approximately 0.1% to approximately 70% by weight, approximately 0.1% to approximately 15% by weight, or approximately 0.01% to approximately 2.5% by weight.

[0044] In some embodiments, the CIC-Al of this disclosure further comprises a solvent. Generally, any solvent suitable for CIC-Al and / or the intended activity is available. In some embodiments, the solvent comprises water, alcohol, and / or polyol. In some embodiments, the polyol may be an aliphatic polyol such as ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, tripropylene glycol, 1,2-propanediol, 1,3-propanediol, 1,2-butanediol, 1,3-butanediol, 1,4-butanediol, 1,5-pentanediol, neopentyl glycol, 1,2-hexanediol, 1,6-hexanediol, 1,2-octanediol, 1,8-octanediol, 1,2-decanediol, 1,10-decanediol, glycerol, 2,2-dimethylolpropane, trimethylolethane, trimethylolpropane, pentaerythritol, dipentaerythritol, sorbitol, 1,2,4-butanetriol, 2,2,4-trimethyl-1,3-pentanediol, or a combination thereof. Non-limiting examples of suitable alcohols that can be used as solvents include methanol, ethanol, propanol, isopropanol, n-butanol, isobutanol, pentanol, hexanol, heptanol, octanol, benzyl alcohol, phenol, cyclohexanol, and combinations thereof. In some embodiments, the solvent includes water, methanol, ethanol, ethylene glycol, propylene glycol, or combinations thereof.

[0045] In one embodiment, the solvent may be present in an amount of about 10% to about 100% of the total volume of the composition. In another embodiment, the solvent may be present in CIC-Al in an amount that constitutes the remainder of the composition once all other components are determined.

[0046] In one embodiment, CIC-Zn comprises a biochelating agent, a metal-counterion, one or more common corrosion inhibitors, and a solvent. The biochelating agent, metal-counterion, and common corrosion inhibitors may be of the types disclosed herein. In one embodiment, these materials may be present in CIC-Zn in the amounts previously disclosed herein for CIC-Al.

[0047] In some embodiments, CIC-Zn further comprises a solvent. Generally, any solvent suitable for CIC-Zn and / or the intended activity can be used. In some embodiments, the solvent includes water, alcohol, polyol, or a combination thereof.

[0048] In one embodiment, the solvent is a polyol. The polyol may be an aliphatic polyol such as ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, tripropylene glycol, 1,2-propanediol, 1,3-propanediol, 1,2-butanediol, 1,3-butanediol, 1,4-butanediol, 1,5-pentanediol, neopentyl glycol, 1,2-hexanediol, 1,6-hexanediol, 1,2-octanediol, 1,8-octanediol, 1,2-decanediol, 1,10-decanediol, glycerol, 2,2-dimethylolpropane, trimethylolethane, trimethylolpropane, pentaerythritol, dipentaerythritol, sorbitol, 1,2,4-butanetriol, 2,2,4-trimethyl-1,3-pentanediol, or a combination thereof.

[0049] In one embodiment, the solvent is an alcohol. Non-limiting examples of suitable alcohols available as solvents include methanol, ethanol, propanol, isopropanol, n-butanol, isobutanol, pentanol, hexanol, heptanol, octanol, benzyl alcohol, phenol, cyclohexanol, and combinations thereof. In one embodiment, the solvent includes water, methanol, ethanol, ethylene glycol, propylene glycol, or combinations thereof.

[0050] In one embodiment, the solvent may be present in an amount of about 10% to about 100% of the total volume of CIC-Zn. In another embodiment, the solvent may be present in CIC-Zn in an amount that constitutes the remainder of the composition once all other components are determined.

[0051] In one or more embodiments, the types of corrosion inhibitor compositions disclosed herein (e.g., CIC-Al, CIC-Zn, etc.) can be prepared by any suitable method. For example, two or more components of a corrosion inhibitor composition (e.g., a biochelating agent and a solvent) can be blended or mixed in a suitable container (e.g., a vessel, a blender, etc.). In one embodiment, the components of a corrosion inhibitor composition are mixed to form a homogeneous mixture that can be introduced into a system to promote corrosion inhibition.

[0052] A corrosion inhibitor composition can be introduced into an aqueous system in an amount effective to promote the activity targeted by the user and / or method (e.g., corrosion inhibition). For example, to effectively inhibit corrosion, the corrosion inhibitor composition may need to be present above a certain concentration. The minimum amount of inhibitor required to prevent corrosion is generally called the "minimum inhibitory concentration" (MIC) or "minimum effective concentration" (MEC). In one or more embodiments, a system into which a corrosion inhibitor composition has been introduced may be monitored to ensure that the amount of corrosion inhibitor composition maintains the MIC or MEC for that particular system.

[0053] In one embodiment, the MIC or MEC of the active components of CIC-Zn and / or CIC-Al (e.g., components other than the solvent) may be in the range of about 1 ppm to about 100 ppm, about 5 ppm to about 50 ppm, or about 10 ppm to about 30 ppm by weight in the aqueous fluid in the system.

[0054] In one or more embodiments, the type of corrosion inhibitor composition disclosed herein can also function to suppress scale formation. Here, scale refers to hard mineral coatings and corrosive deposits consisting of solids and sediments that accumulate on or inside water distribution systems, pipes, reservoirs and water conduits. In some embodiments, the type of corrosion inhibitor composition disclosed herein can reduce scale in systems containing industrial water to about 10% to about 90%, about 20% to about 80%, or about 30% to about 80% of the amount of scale that would form in the absence of the type of corrosion inhibitor composition disclosed herein.

[0055] The aqueous system into which the corrosion inhibitor composition may be introduced may further contain calcium ions, magnesium ions, or both. In one embodiment, the corrosion inhibitor composition is introduced into the system by any suitable method. For example, CIC-Zn and / or CIC-Al may be injected through a suitable system inlet, such as a port or valve, that brings CIC-Zn and / or CIC-Al into contact with the aqueous system. In one embodiment, the method of the Disclosure further includes monitoring and adjusting the amount of the corrosion inhibitor composition to maintain the amount of the composition in the system within a range required by the user and / or the method. In one embodiment, the type of corrosion inhibitor composition disclosed herein may be introduced into the system manually. In another embodiment, the introduction of the corrosion inhibitor composition may be automated. A method may be developed to monitor the concentration of the corrosion inhibitor composition in the system. Monitoring of the dosage of the corrosion inhibitor composition in the system may be continuous, semi-continuous, discontinuous, automatic, manual, or a combination thereof.

[0056] This method may involve programming a device such as a pump to supply a predetermined dose of the corrosion inhibitor composition to a particular system, which is at least MIC or MEC. This method can be automated by using a suitable supply device, such as a material feeder, or a pump, such as a programmable pump. The device, such as a pump, can be programmed to operate a specific number of times at specific execution time intervals to add only the necessary amount of the corrosion inhibitor composition to the water being treated.

[0057] In some embodiments, the corrosion inhibitor compositions of the present disclosure surprisingly exhibit improved corrosion inhibition compared to conventional corrosion inhibitors. For example, CIC-Al, which contains a biochelating agent, an organic acid, and a conventional corrosion inhibitor (e.g., triazole), shows unexpectedly beneficial improvements in corrosion inhibition of about 10% to about 100%, about 70% to about 90%, or about 90% to about 99% compared to the corrosion inhibition observed with conventional corrosion inhibitors alone.

[0058] In one embodiment, a synergistic effect can be observed when the type of corrosion inhibitor composition disclosed herein is used in combination with a common corrosion inhibitor (e.g., triazole). As a result, the minimum concentration of the common corrosion inhibitor required to effectively address corrosion problems may be reduced. Specifically, the addition of the type of corrosion inhibitor composition disclosed herein may reduce the amount of common corrosion inhibitor required to achieve the same level of corrosion suppression by about 10%, 15%, or even 20% or more. Consequently, the amount of common corrosion inhibitor used decreases, and consequently, the costs and environmental impact associated with the manufacture and use of these compounds also decrease.

[0059] Examples While the subject matter of this disclosure has been described in general terms, the following examples are presented to illustrate specific aspects of the subject matter and to demonstrate their implementation and merits. It should be understood that the examples are presented for illustrative purposes only and are not intended to limit the scope of this specification or the claims in any way.

[0060] Example 1 The effectiveness of corrosion inhibitor compositions was evaluated. Specifically, the corrosion rate of aluminum test specimens was measured in mills per year (mpy) for the following: (1) a blank sample containing only saline solution (no additives), (2) CIC-Al containing 84% glucaric acid solution and 16% LaCl3 salt, (3) CIC-Al containing 53.6% aqueous glucaric acid solution, (4) CIC-Al containing 31.4% aqueous sodium aluminate solution, 53.6% aqueous glucaric acid solution, and 15% aqueous sodium hydroxide solution, and (5) 4 ppm sodium tolyltriazole (TTA). The corrosion rate was measured using aluminum test specimens under the following test conditions: 100% water content, 3% NaCl saline solution, rotation speed of 100 rpm, pH 8, and reaction time of 24 hours.

[0061] Table 1 shows the experimental results of the amount of corrosion observed in mpy after 24 hours, and Figure 1 shows the corrosion rate as a function of time in the sample. [Table 1]

[0062] Surprisingly, the corrosion inhibitor compositions of the type disclosed herein were demonstrated to provide significantly better corrosion inhibition of aluminum alloys than uncomplexed acids and other compounds. Corrosion inhibitor compositions of the type disclosed herein, containing aluminum complexes or lanthanum complexes, showed the highest level of corrosion inhibition.

[0063] Example 2 The effectiveness of CIC-Zn as a corrosion inhibitor for galvanized steel sheets was evaluated. Specifically, a one-week corrosion test was conducted on multiple galvanized test specimens, simulating severe corrosion conditions with high chloride content and low alkalinity. The specific conditions were as follows: after air purging, the galvanized test specimens were exposed for one week to 25 ppm alkalinity, 2000 ppm chloride, pH 8 to 8.5, and a temperature of 40°C. The weight of the test specimens was measured before and after the test, and the corrosion rate was calculated. The test results are shown in Table 2. [Table 2]

[0064] As shown in Table 2, the performance of TTA is improved by adding glucaric acid (6.28 MPY vs. 3.54 MPY). Furthermore, the corrosion rates are dramatically reduced to 0.29 MPY and 0.36 MPY, respectively, when cations such as silicates and aluminates are used, with or without azoles.

[0065] Images of the test specimens from Tests 1-5 are shown in Figure 2. As can be seen in Figure 2, a considerable amount of white rust occurred with TTA alone (Test 1), and the corrosion rate was also high. With CIC-Zn alone or in the presence of TTA (No. 4, No. 5), the corrosion rate was the lowest, and the test specimens were the cleanest.

[0066] Additional disclosures The following listed embodiments of this disclosure are provided as non-limiting examples.

[0067] The first embodiment is a corrosion inhibitor for nonferrous metals, comprising (i) a biochelating agent, (ii) a solvent, and (iii) at least one material selected from the group consisting of basically ring-opening agents, organic acids, general corrosion inhibitors, and combinations thereof.

[0068] The second embodiment is a corrosion inhibitor of the first embodiment, wherein the biochelating agent includes aldonic acid, uronic acid, aldalic acid, gluconic acid oxidation products, gluconates, glucaric acid, gluconic acid, glucuronic acid, glucose oxidation products, galactonic acid, galactaric acid, glutamic acid, glucodialdose, 2-ketoglucose, disaccharides, disaccharide oxides, n-keto acids, C2-C6 diacides, salts thereof, or combinations thereof.

[0069] A third embodiment is a corrosion inhibitor of the first or second embodiment, wherein the biochelating agent comprises sodium gluconate, oxidation products of sodium glucarate, salts thereof, derivatives thereof, or combinations thereof.

[0070] The fourth embodiment is a corrosion inhibitor according to any of the first to third embodiments, wherein the biochelating agent is present in an amount of approximately 0.5% to approximately 70% by weight relative to the total weight of the corrosion inhibitor.

[0071] The fifth embodiment is a corrosion inhibitor according to any of the first to fourth embodiments, wherein the ring-opening agent comprises a lanthanide salt, an aluminate, or a combination thereof.

[0072] The sixth aspect is a corrosion inhibitor of the fifth aspect, wherein the lanthanide salt comprises lanthanum (La), cerium (Ce), praseodymium (Pr), neodymium (Nd), promethium (Pm), samarium (Sm), europium (Eu), gadolinium (Gd), terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm), ytterbium (Yb), lutetium (Lu), or a combination thereof.

[0073] The seventh embodiment is a corrosion inhibitor according to any of the first to sixth embodiments, wherein the organic acid comprises citric acid, lactic acid, acetic acid, formic acid, oxalic acid, uric acid, malic acid, tartaric acid, or a combination thereof.

[0074] The eighth aspect is a corrosion inhibitor of any of the first to seventh aspects, where a general corrosion inhibitor is imidazole, pyrazole, 1,2,3-triazole, 1,2,4-triazole, tetrazol, oxazole, isoxazole, 1,2,4-oxadiazole, 1,3,4-oxadiazole, thiazole, 1,2,4-thiadiazole, mercaptobenzothiazole, mercaptobenzoimidazole, butylbenzotriazole, 1,3,4-thiadiazole, benzo This includes triazoles, 2,4-tolyltriazoles, (2-pyrrolecarbonyl)benzotriazoles, (2-thienylcarbonyl)benzotriazoles, amino-1,2,4-triazoles, diamino-1,2,4-triazoles, mercapto-1H-1,2,4-triazoles, methyl-2-phenylimidazoles, amino-3-hydrazino-5-mercapto-1,2,4-triazoles, phenyl-1-H-tetrazoles, their derivatives, or combinations thereof.

[0075] The ninth aspect is a corrosion inhibitor according to any of the first to eighth aspects, wherein the general corrosion inhibitor contains a molybdate salt.

[0076] The tenth embodiment is a corrosion inhibitor according to any of the first to ninth embodiments, wherein the general corrosion inhibitor includes aminotrimethylenephosphonic acid (ATMP), 1-hydroxyethylidene-1,1-diphosphonic acid (HEDP), hydrolyzed polymaleic anhydride (HPMA), 2-hydrophosphonocarboxylic acid (HPAA), polyaminopolyetherphosphonate (PAPEMP), aminoethylethanolamine (AEEA), diethylenetriaminepenta (DTPMP), bis(hexamethylenetriaminepenta(methylenephosphonic acid)) (BHMT), diethylenetriaminepenta(methylenephosphonic acid) (BTPMP), 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTC), polymacrylates, maleic acid, polyaspartic acid, sodium aspartate, phosphinocarboxylate, acrylic acid-2-acrylamide-2-methylpropanesulfonic acid (AA-AMPS), or a combination thereof.

[0077] The eleventh embodiment is a corrosion inhibitor according to any of the first to tenth embodiments, wherein the solvent includes water, ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, tripropylene glycol, 1,2-propanediol, 1,3-propanediol, 1,2-butanediol, 1,3-butanediol, 1,4-butanediol, 1,5-pentanediol, neopentyl glycol, 1,2-hexanediol, 1,6-hexanediol, 1,2-octanediol, 1,8-octanediol, 1,2-decanediol, 1,10-decanediol, glycerol, 2,2-dimethylolpropane, trimethylolethane, trimethylolpropane, pentaerythritol, dipentaerythritol, sorbitol, 1,2,4-butanetriol, 2,2,4-trimethyl-1,3-pentanediol, or a combination thereof.

[0078] A twelfth aspect is a method for reducing corrosion in a system having industrial water and a metal surface, comprising introducing a corrosion inhibitor composition into the system, which comprises (i) a biochelating agent, (ii) a solvent, and (iii) at least one material selected from the group consisting of ring-opening agents, organic acids, general corrosion inhibitors, and combinations thereof.

[0079] A thirteenth aspect is the method of the twelfth aspect, wherein the metal surface consists of an aluminum-containing compound, a zinc-containing compound, or a combination thereof.

[0080] A 14th aspect is a method according to the 12th or 13th aspect, wherein the biochelating agent includes aldonic acid, uronic acid, aldalic acid, glucose oxidation products, gluconic acid oxidation products, gluconates, glucaric acid, gluconic acid, glucuronic acid, galactonic acid, galactaric acid, glutamic acid, glucodialdose, 2-ketoglucose, disaccharides, disaccharide oxides, n-keto acids, C2 to C6 diacides, salts thereof, or combinations thereof.

[0081] The 15th embodiment is a method according to any of the 12th to 14th embodiments, wherein the ring-opening agent comprises a lanthanide salt, an aluminate, or a combination thereof.

[0082] The sixteenth aspect is a method according to any of the twelve to fifteenth aspects, wherein the organic acid includes citric acid, lactic acid, acetic acid, formic acid, oxalic acid, uric acid, malic acid, tartaric acid, or a combination thereof.

[0083] The 17th aspect is a method according to any of the 12th to 16th aspects, wherein the general corrosion inhibitor includes imidazole, pyrazole, 1,2,3-triazole, 1,2,4-triazole, tetrazol, oxazole, isoxazole, 1,2,4-oxadiazole, 1,3,4-oxadiazole, thiazole, 1,2,4-thiadiazole, 1,3,4-thiadiazole, benzotriazole, 2,4-tolyltriazole, derivatives thereof, or combinations thereof.

[0084] The 18th embodiment is a method according to any of the 12th to 17th embodiments, wherein the organic acid includes citric acid, lactic acid, acetic acid, formic acid, oxalic acid, uric acid, malic acid, tartaric acid, or a combination thereof.

[0085] The 19th aspect is a method according to any of the 12th to 18th aspects, wherein the solvent includes water, ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, tripropylene glycol, 1,2-propanediol, 1,3-propanediol, 1,2-butanediol, 1,3-butanediol, 1,4-butanediol, 1,5-pentanediol, neopentyl glycol, 1,2-hexanediol, 1,6-hexanediol, 1,2-octanediol, 1,8-octanediol, 1,2-decanediol, 1,10-decanediol, glycerol, 2,2-dimethylolpropane, trimethylolethane, trimethylolpropane, pentaerythritol, dipentaerythritol, sorbitol, 1,2,4-butanetriol, 2,2,4-trimethyl-1,3-pentanediol, or a combination thereof.

[0086] The 20th aspect is a method according to any of the 12th to 19th aspects, wherein the system includes a boiler, a cooling tower, a cooling system, a closed recirculation cooling system, a dry cooling tower, an open recirculation system, or an internal combustion engine.

[0087] A 21st embodiment is a system comprising at least one metal surface, a corrosion inhibitor, and industrial water, wherein the corrosion inhibitor comprises a biochelating agent in an amount of about 0.5% to about 70% by weight relative to the total weight of the corrosion inhibitor, and the system comprises a boiler, a cooling tower, a cooling system, a closed recirculation cooling system, a dry cooling tower, an open recirculation system, or an internal combustion engine.

[0088] The 22nd aspect is a system of the 21st aspect, wherein the metal surface consists of an aluminum-containing compound, a zinc-containing compound, or a combination thereof.

[0089] The 23rd embodiment is a corrosion inhibitor comprising a biochelating agent, a solvent, and at least two materials selected from the group consisting of ring-opening agents, organic acids, conventional corrosion inhibitors, and combinations thereof.

[0090] The 24th aspect is a corrosion inhibitor of the 23rd aspect, wherein the biochelating agent is a naturally occurring molecule such as a monosaccharide or polysaccharide, or derived from a naturally occurring molecule.

[0091] The 25th embodiment is a corrosion inhibitor according to the 23rd or 24th embodiment, wherein the biochelating agent comprises aldonic acid, uronic acid, aldalic acid, salts thereof, derivatives thereof, or combinations thereof.

[0092] The 26th embodiment is a corrosion inhibitor according to any of the 23rd to 25th embodiments, wherein the biochelating agent comprises sodium gluconate, oxidation products of sodium glucarate, one or more salts thereof, one or more derivatives thereof, or a combination thereof.

[0093] The 27th aspect is a corrosion inhibitor of the 26th aspect, wherein the biochelating agent further comprises less than about 50% by weight of an n-keto acid and a diacid from C2 to C5.

[0094] The 28th embodiment is a corrosion inhibitor according to any of the 23rd to 27th embodiments, wherein the ring-opening agent comprises a lanthanide salt, an aluminate, or a combination thereof.

[0095] The 29th embodiment is a corrosion inhibitor according to any of the 23rd to 28th embodiments, wherein the conventional corrosion inhibitor includes imidazole, pyrazole, 1,2,3-triazole, 1,2,4-triazole, tetrazol, oxazole, isoxazole, 1,2,4-oxadiazole, 1,3,4-oxadiazole, thiazole, 1,2,4-thiadiazole, 1,3,4-thiadiazole, benzotriazole, toltriazole, derivatives thereof, or combinations thereof.

[0096] The 30th embodiment is a corrosion inhibitor according to any of the 23rd to 29th embodiments, wherein the organic acid includes citric acid, lactic acid, acetic acid, formic acid, oxalic acid, uric acid, malic acid, tartaric acid, or a combination thereof.

[0097] The 31st embodiment is a corrosion inhibitor according to any of the 23rd to 30th embodiments, wherein the solvent includes water, ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, tripropylene glycol, 1,2-propanediol, 1,3-propanediol, 1,2-butanediol, 1,3-butanediol, 1,4-butanediol, 1,5-pentanediol, neopentyl glycol, 1,2-hexanediol, 1,6-hexanediol, 1,2-octanediol, 1,8-octanediol, 1,2-decanediol, 1,10-decanediol, glycerol, 2,2-dimethylolpropane, trimethylolethane, trimethylolpropane, pentaerythritol, dipentaerythritol, sorbitol, 1,2,4-butanetriol, 2,2,4-trimethyl-1,3-pentanediol, or a combination thereof.

[0098] The 32nd embodiment is a corrosion inhibitor according to any of the 23rd to 31st embodiments, wherein the solvent comprises water, methanol, ethanol, ethylene glycol, propylene glycol, ethylene glycol monobutyl ether, or a combination thereof.

[0099] The 33rd aspect is a method for reducing corrosion in a system having an aluminum or aluminum alloy surface, comprising introducing an aqueous solution containing a corrosion inhibitor according to any of the 23rd to 32nd aspects.

[0100] A 34th embodiment is a white rust inhibitor for aqueous systems containing zinc or galvanized steel, comprising a biochelating agent, a counterion, a conventional corrosion inhibitor, and a solvent.

[0101] The 35th aspect is the inhibitor of the 34th aspect, wherein the biochelating agent is a naturally occurring molecule such as a monosaccharide or polysaccharide, or derived from a naturally occurring molecule.

[0102] The 36th aspect is an inhibitor of the 34th or 35th aspect, wherein the biochelating agent comprises aldonic acid, uronic acid, aldalic acid, salts thereof, derivatives thereof, or combinations thereof.

[0103] The 37th embodiment is an inhibitor according to any of the 34th to 36th embodiments, wherein the biochelating agent comprises sodium gluconate, an oxidation product of sodium glucarate, one or more salts thereof, one or more derivatives thereof, or a combination thereof.

[0104] The 38th aspect is the inhibitor of the 37th aspect, wherein the biochelating agent further comprises less than about 50% by weight of an n-keto acid and a C2 to C6 diacid.

[0105] The 39th embodiment is an inhibitor according to any of the 34th to 38th embodiments, wherein the conventional corrosion inhibitor includes thiazole, triazole, or a combination thereof.

[0106] The 40th aspect is an inhibitor of any of the 34th to 39th aspects, wherein the conventional corrosion inhibitor is imidazole, pyrazole, 1,2,3-triazole, 1,2,4-triazole, tetrazol, oxazole, isoxazole, 1,2,4-oxadiazole, 1,3,4-oxadiazole, thiazole, 1,2,4-thiadiazole, mercaptobenzothiazole, mercaptobenzoimidazole, butylbenzotriazole, 1,3,4-thiadiazole, benzo This includes riazole, toltriazole, (2-pyrrolecarbonyl)benzotriazole, (2-thienylcarbonyl)benzotriazole, amino-1,2,4-triazole, diamino-1,2,4-triazole, mercapto-1H-1,2,4-triazole, methyl-2-phenylimidazole, amino-3-hydrazino-5-mercapto-1,2,4-triazole, phenyl-1-H-tetrazole, one or more derivatives thereof, or combinations thereof.

[0107] The 41st embodiment is an inhibitor according to any of the 34th to 40th embodiments, wherein the conventional corrosion inhibitor contains a molybdate salt.

[0108] The 42nd embodiment is an inhibitor of any of the 34th to 41st embodiments, wherein the conventional corrosion inhibitor includes ATMP (aminotrimethylenephosphonic acid), HEDP (1-hydroxyethylidene-1,1-diphosphonic acid), HPMA (hydrolyzed polymaleic anhydride), HPAA (2-hydrophosphonocarboxylic acid), PAPEMP (polyaminopolyetherphosphonate), AEEA (aminoethylethanolamine), DTPMP (diethylenetriaminepentaphosphonic acid), BHMT (bis(hexamethylenetriaminepenta(methylenephosphonic acid))), BTPMP (diethylenetriaminepenta(methylenephosphonic acid)), PBTC (2-phosphonobutane-1,2,4-tricarboxylic acid), polymacrylate, maleic acid, polyaspartic acid, sodium aspartate, phosphinocarboxylate, AA-AMPS (acrylic acid-2-acrylamido-2-methylpropanesulfonic acid), or a combination thereof.

[0109] The 43rd embodiment is an inhibitor of any of the 34th to 42nd embodiments, wherein the solvent includes ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, tripropylene glycol, 1,2-propanediol, 1,3-propanediol, 1,2-butanediol, 1,3-butanediol, 1,4-butanediol, 1,5-pentanediol, neopentyl glycol, 1,2-hexanediol, 1,6-hexanediol, 1,2-octanediol, 1,8-octanediol, 1,2-decanediol, 1,10-decanediol, glycerol, 2,2-dimethylolpropane, trimethylolethane, trimethylolpropane, pentaerythritol, dipentaerythritol, sorbitol, 1,2,4-butanetriol, 2,2,4-trimethyl-1,3-pentanediol, or a combination thereof.

[0110] The 44th embodiment is an inhibitor according to any of the 34th to 43rd embodiments, wherein the solvent comprises water, methanol, ethanol, ethylene glycol, propylene glycol, or a combination thereof.

[0111] The 45th embodiment is a inhibitor of any of the 34th to 44th embodiments, wherein the aqueous system contains copper ions.

[0112] The 46th embodiment is an inhibitor according to any of the 34th to 45th embodiments, wherein the counterion comprises silicon, silica silicon, silicates, aluminum, lanthanum, sodium, calcium, potassium, ammonium, boron, indium, or a combination thereof.

[0113] While aspects of the subject matter of this disclosure have been described in detail, those skilled in the art can modify them without departing from the spirit and teachings of the subject matter. The aspects described herein are illustrative and not intended to limit the scope. Many changes and modifications of the subject matter disclosed herein are possible and remain within the scope of the disclosed subject matter. Where a numerical range or limitation is expressly stated, such express range or limitation should be understood to include repeating ranges or limitations of similar magnitude that fall within the expressly stated range or limitation (for example, from about 1 to about 10 includes 2, 3, 4, etc., and greater than 0.10 includes 0.11, 0.12, 0.13, etc.). The use of the term “optionally” with respect to any element of a claim is intended to mean that the element in question is either essential or not essential. Both options are intended to be included in the claim. The use of broader terms such as "comprises," "includes," and "having" should be understood as providing support for narrower terms such as "consisting of," "consisting essentially of," and "consisting substantially of."

[0114] Accordingly, the scope of protection is not limited by the above description, but only by the claims below, which include all equivalents of the subject matter of the claims. Each claim is incorporated into the specification as an aspect of the present disclosure. Accordingly, the claims are further description and additional aspects of the present invention. The references herein, in particular references published after the priority date of this application, are not construed as prior art to the subject matter of the present disclosure. All patents, patent applications, and publications cited herein are incorporated herein by reference to the extent that they provide exemplary, procedural, or other details that supplement the descriptions herein.

Claims

1. A corrosion inhibitor composition for non-ferrous metals containing aluminum or zinc, (i) A biochelating agent comprising glucaric acid, glucarate, or a combination thereof, (ii) A ring-opening agent comprising a lanthanide salt, an aluminate, or a combination thereof, (iii) Solvent and Includes, The biochelating agent exists in an equilibrium state between the lactone form and the linear carboxylic acid form. A corrosion inhibitor composition wherein the ring-opening agent increases the amount of the biochelating agent that can coordinate with metal ions contributing to corrosion by shifting the equilibrium so that the proportion of the linear carboxylic acid type increases.

2. A corrosion inhibitor composition according to claim 1, The biochelating agent is present in an amount of about 0.5% to about 70% by weight relative to the total weight of the corrosion inhibitor composition. A corrosion inhibitor composition wherein the ring-opening agent is present in an amount of about 10% to about 80% by weight relative to the total weight of the corrosion inhibitor composition.

3. A corrosion inhibitor composition according to claim 1, The ring-opening agent comprises an aluminate, A corrosion inhibitor composition wherein the aluminate comprises sodium aluminate.

4. A corrosion inhibitor composition according to claim 1, The ring-opening agent comprises a lanthanide chloride salt, A corrosion inhibitor composition wherein the lanthanide chloride salt comprises lanthanum (La), cerium (Ce), praseodymium (Pr), neodymium (Nd), promethium (Pm), samarium (Sm), europium (Eu), gadolinium (Gd), terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm), ytterbium (Yb), lutetium (Lu), or a combination thereof.

5. A corrosion inhibitor composition according to claim 1, A corrosion inhibitor composition containing a triazole compound selected from benzotriazole, tritriazole, and combinations thereof.

6. A corrosion inhibitor composition according to claim 1, A corrosion inhibitor composition wherein the solvent comprises water, ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, tripropylene glycol, 1,2-propanediol, 1,3-propanediol, 1,2-butanediol, 1,3-butanediol, 1,4-butanediol, 1,5-pentanediol, neopentyl glycol, 1,2-hexanediol, 1,6-hexanediol, 1,2-octanediol, 1,8-octanediol, 1,2-decanediol, 1,10-decanediol, glycerol, 2,2-dimethylolpropane, trimethylolethane, trimethylolpropane, pentaerythritol, dipentaerythritol, sorbitol, 1,2,4-butanetriol, 2,2,4-trimethyl-1,3-pentanediol, or a combination thereof.

7. A method for reducing corrosion of non-ferrous metals containing aluminum or zinc on metal surfaces with industrial water, (i) A biochelating agent comprising glucaric acid, glucarate, or a combination thereof, (ii) A ring-opening agent comprising a lanthanide salt, an aluminate, or a combination thereof, (iii) Solvent and This includes introducing a corrosion inhibitor composition containing into the system, The biochelating agent exists in an equilibrium state between the lactone form and the linear carboxylic acid form. A method for increasing the amount of the biochelating agent that can coordinate with metal ions contributing to corrosion by shifting the equilibrium so that the proportion of the linear carboxylic acid type of the ring-opening agent increases.

8. The method according to claim 7, A method wherein the solvent comprises water, ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, tripropylene glycol, 1,2-propanediol, 1,3-propanediol, 1,2-butanediol, 1,3-butanediol, 1,4-butanediol, 1,5-pentanediol, neopentyl glycol, 1,2-hexanediol, 1,6-hexanediol, 1,2-octanediol, 1,8-octanediol, 1,2-decanediol, 1,10-decanediol, glycerol, 2,2-dimethylolpropane, trimethylolethane, trimethylolpropane, pentaerythritol, dipentaerythritol, sorbitol, 1,2,4-butanetriol, 2,2,4-trimethyl-1,3-pentanediol, or a combination thereof.

9. The method according to claim 7, A method wherein the system comprises a boiler, a cooling tower, a cooling system, a closed recirculation cooling system, a dry cooling tower, an open recirculation system, or an internal combustion engine.

10. A system comprising at least one non-ferrous metal surface, a corrosion inhibitor composition, and industrial water, The non-ferrous metal surface comprises an aluminum-containing compound, a zinc-containing compound, or a combination thereof. The aforementioned corrosion inhibitor composition is (i) A biochelating agent comprising glucaric acid, glucarate, or a combination thereof, (ii) A ring-opening agent comprising a lanthanide salt, an aluminate, or a combination thereof, (iii) A solvent containing water, It contains, The biochelating agent exists in an equilibrium state between the lactone form and the linear carboxylic acid form. The ring-opening agent increases the amount of the biochelating agent that can coordinate with metal ions contributing to corrosion by shifting the equilibrium so that the proportion of the linear carboxylic acid type increases. The system comprises a boiler, a cooling tower, a cooling system, a closed recirculation cooling system, a dry cooling tower, an open recirculation system, or an internal combustion engine.

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