243results about How to "High corrosion inhibition efficiency" patented technology

The invention discloses a water soluble corrosion inhibitor, the preparation method and the application of the corrosion inhibitor, solving the defect of narrow application range of the corrosion inhibitor pH in the prior art; the water soluble corrosion inhibitor is composed of 20-70 weight proportion of imidazolines derivates, 1-10 weight proportion of pyridine derivates, 1-20 weight proportion of corrosion inhibition auxiliary agent and 10-50 weight proportion of solvent, based on the total weight of the corrosion inhibitor as the reference. The water soluble corrosion inhibitor in the invention has corrosion inhibition effect on the metal material in the medium with wide PH variation range (pH equals to 1-10) and good metal surface film formation property.

The invention belongs to the field of petroleum engineering and relates to a shale gas reservoir pre-fracture composite acid solution and its preparation method and application. The composite acid solution comprises the following components: Component a) at least one component of hydrochloric acid, hydrofluoric acid, fluorboric acid, phosphoric acid, formic acid and acetic acid; and Component b) a corrosion inhibitor, a discharge aiding agent, a ferric iron stabilizer and a clay stabilizer. The composite acid solution containing different acids is selected for different reservoirs. Rock core corrosion ratio is 25-30%. A certain rock core corrosion ratio is maintained, and borehole wall collapse caused by too high corrosion ratio is also prevented. The corrosion inhibitor, the discharge aiding agent, the ferric iron stabilizer and the clay stabilizer which are used as additives have good compatibility with acid. The composite acid solution provided by the invention has advantages of fast dissolving speed, uniform mixing, high corrosion inhibition efficiency, high surface activity, good clay stabilizing effect and wide range. Applicable temperature of the composite acid solution is 20-180 DEG C. by the use of the composite acid solution, normal construction of large-scale fracturing of long horizontal-section shale gas wells can be guaranteed under the condition of existing equipment capacity.

The invention discloses a deformed steel bar compound corrosion-inhibited quenching agent and a usage method thereof. The compound corrosion-inhibited quenching agent is obtained by mixing the following compositions in parts by weight: 0-1 part of sodium carboxy methyl cellulose, 0-1 part of sodium polyacrylate, 0.1-1 part of sodium benzoate, 0.1-2 parts of triethanolamine, 0-0.1 part of sodium molybdate, 0-5 parts of sodium hydroxide, 0-10 parts of sodium carbonate, 5-15 parts of sodium silicate, and 70-90 parts of water. In use, the non-rusted deformed steel bar is subjected to quenching treatment in the corrosion-inhibited quenching agent for 1-2s at 100-200 DEG C, thereby being capable of slowing down the corrosion of the deformed steel bar under the atmosphere. The corrosion-inhibited quenching agent does not contain nitrite and chromate, has no S and P atoms, and is green and environment-friendly, low in cost, and recyclable.

The invention relates to a acidified corrosion inhibitor for oil well and preparation method thereof. The preparation has the steps of: firstly synthesizing imidazoline intermediate body, carrying out quaternization reaction with benzyl chloride, and then compounding generated quaternary ammonium salt and propiolic alcohol according to mass ratio 3:1 for obtaining the product. 0.4% (mass percentage content) of present corrosion inhibitor in 15% HCl medium has obvious inhibition for corrosion of N80 carbon steel. The corrosion rate is 0.70 g / mh after 4h of corrosion at 60 DEG C, the corrosion inhibition efficiency thereof can reach to 99.39%; the corrosion rate is 1.44 g / mh after 4h of corrosion at 90 DEG C, which is superior to oil and gas industry standard of the People's Republic of China SY / T5405-1996 corrosion evaluating indicator first grade product standard (at 60 DEG C, first grade product standard is 2-3g / mh; at 90 DEG C, first grade product standard is 3-4g / mh).

The invention belongs to the field of preparation of intelligent corrosion inhibitors, and particularly relates to a preparation method of a pH-controlled-release long-acting intelligent corrosion inhibitor. A using method of the conventional corrosion inhibitor is realized mainly through one-time addition or continuous addition for multiple times, and the concentration of the corrosion inhibitor in an early period is too high, while the concentration of the corrosion inhibitor in a late period is too low, therefore, resource waste is caused, the slow release efficiency is reduced, and even sometimes, the corrosion rate is accelerated, as a result, the invention prepares the pH-controlled-release long-acting intelligent corrosion inhibitor which is a hydrogel-embedded corrosion inhibitor, is sensitive to ambient pH and has a corrosion inhibiting function; and the intelligent corrosion inhibitor can determine the release condition according to different properties of an ambient medium.

This disclosure relates to a preparation method of a low-pH controlled-release intelligent corrosion inhibitor. The low-pH controlled-release intelligent corrosion inhibitor comprises a hydrogel with low pH responsiveness and a corrosion inhibiting substance having the capacity of corrosion inhibition. That is, a corrosion inhibiting substance is wrapped in a low-pH sensitive hydrogel. The swelling degree of the pH sensitive hydrogel may be changed according to the amounts of monomers and crosslinking agents so as to control the releasing speed of the corrosion inhibiting substance. By the soaking experiment and the measurements of electrochemical polarization curves and alternating impedance spectra, the sensitive and long-lasting features of the low-pH controlled-release intelligent corrosion inhibitor are indicated. Therefore, the advantageous effects of this disclosure lies in that: 1) the system enables the releasing speed of the corrosion inhibiting substance to be controlled by pH; 2) the system enables long-lasting effect and high corrosion inhibition efficiency of the corrosion inhibiting substance; and 3) the system has broad applicability.

The invention relates to a preparation method of acidizing corrosion inhibitor in a high-temperature and concentrated acid environment. The preparation method is used for an acidification technology in carbonate oil reservoir exploration and overcomes the problem that existing high-temperature acidification corrosion inhibitor is poor in solubility and dispersion in use and prone to coking. According to the technical scheme, firstly, formaldehyde, benzene methanamine, absolute ethyl alcohol and concentrated hydrochloric acid are added into a three-necked flask, and then the three-necked flask is placed into an oil bath pan with the temperature being 110 DEG C for conducting a reaction for 2 hours; then, acetophenone is added, the pH is adjusted to 4 through concentrated hydrochloric acid, a reaction is conducted for 4 hours, and a coarse mannich base is obtained; thirdly, a vacuum rotary evaporation instrument is utilized for purification, separation is conducted, and a mannich base intermediate is obtained; fourthly, after the intermediate obtained in step 3 is washed, benzyl chloride is added, a reaction is conducted for 6 hours at the temperature of 110 DEG C, evaporation and separation are conducted through the vacuum rotary evaporation instrument, and mannich base quaternary ammonium salt is obtained; finally, potassium iodide is added in the mannich base quaternary ammonium salt stirring process for conducting mixed distribution, and the high-temperature acidizing corrosion inhibitor is obtained. The acidizing corrosion inhibitor has good solubility and dispersion, can further improve corrosion inhibition efficiency and is good in stability.

The invention relates to a water-soluble neutralizing agent mainly for oil-extraction plant low-temperature light oil position metallic conservation, which is prepared form naphthenic acid, polyenamine and organic acid anhydrides or ethylene oxide as raw material through mixing with neutralization agent and dissolvent.

The invention discloses a high-efficient compounding plant inhibitor as well as a preparation method and application thereof. The high-efficient compounding plant inhibitor is prepared from 0.03-1.5 g / L of a plant extract, 0.05-0.1 g / L of a natural polymer compound, 0.01-0.05 g / L of an auxiliary agent and the balance of a pickling solution. The preparation method comprises the steps of preparing raw materials and performing compounding. The high-efficient compounding plant inhibitor can be applied for preparing cleaning agents for steel, petro-chemical equipment, filtration and pipelines. The high-efficient compounding plant inhibitor disclosed by the invention has the advantages of being high in corrosion inhibition efficiency, remarkable in mutual synergistic reaction, high in adaptability, after effectiveness and high temperature resistance, and the like, and besides, the corrode effects of acid to steel and aluminum are remarkably restrained, so that the high-efficient compounding plant inhibitor can be suitable for pickling the steel and the aluminum in the acid, and can be applied for cleaning equipment including the petro-chemical equipment, boilers, pipeline and the like. The inhibitor disclosed by the invention is convenient and safe to use and simple to operate, and takes effect quickly.

The invention relates to a novel amido-linkage imidazolium salt gemini surfactant and a preparation method thereof, and the preparation method can be used for solving the problems that the existing preparation method of the amido-linkage heterocyclic gemini surfactant is complicated to operate, high in cost and reaction temperature, long in reaction time, and large in solvent toxicity. The preparation method comprises the following steps of: I, N-alkylation; II, amidation; III, quaternization to obtain the product amido-linkage imidazolium salt gemini surfactant. The preparation method is simple for three-step reaction operations, capable of shortening the reaction time, and mild in reaction conditions, the solvent toxicity is small, the raw material cost is low, the hydrophilic property of the novel amido-linkage imidazolium salt gemini surfactant can be greatly improved through introducing strong-polarity amido linkage and two positive nitrogen ion heads, the novel amido-linkage imidazolium salt gemini surfactant has good biodegradability through introducing nitrogen heterocyclic ring and amido linkage, and the environmentally-friendly gemini surfactant can be used in multiple fields of cleaning, sterilization, restraint of metal corrosion, sewage treatment and the like.

The invention discloses an efficient combined corrosion inhibitor and a preparation method and application thereof. The efficient combined corrosion inhibitor comprises N-heterocyclic compounds of 0.02-1.0 g / L, surface active agents of 0.01-0.05 g / L, high-molecule compounds of 0.005-0.01 g / L, auxiliary agents of 0.01-0.05 g / L and the balance nitric acid pickling solutions. The preparation method comprises the steps of raw material preparation and preparation. According to the application, the efficient combined corrosion inhibitor can be applied to preparation of cleaning agents for steel, petrochemical equipment, boilers and pipelines. The efficient combined corrosion inhibitor has the advantages of being high in corrosion inhibition efficiency, remarkable in mutual synergistic effect, high in adaptability, good in aftereffect and high in resistance to high temperature, obviously inhibiting the corrosion effect of nitric acid to the steel, being suitable for acid pickling of the steel in the nitric acid, being suitable for cleaning of the petrochemical equipment, the boilers and the pipelines, being convenient and safe to use, being easy to operate and being fast in effect.

The invention discloses a corrosion inhibitor and preparation and application thereof. The corrosion inhibitor consists of the following components by total weight of the corrosion inhibitor: 1 to 15 weight percent of imidazoline ester, 1 to 10 weight percent of corrosion inhibition auxiliary and 5 to 50 weight percent of solvent. At a temperature of 30 to 130 DEG C, the corrosion inhibitor has good film forming property, has excellent dispersibility and solubility property and has the corrosion inhibition rate of over 86 percent under the condition of an additive amount of 20 to 50mg / L.

The invention discloses compound ionic liquid braunification liquid for printed-circuit boards. The braunification liquid comprises the following raw materials according to the mass concentrations in the braunification liquid: 70-120 g / L acidic functionalized ionic liquid, 5-20 g / L hydrogen peroxide, 5-15 g / L an ionic liquid corrosion inhibitor and 0.5-5 g / L ionic liquid binding force accelerant, wherein the acidic functionalized ionic liquid is imidazole functionalized ionic liquid with substituted sulfonic group with the side chain length of C2-C8 or substituted carboxylic group, pyridine functionalized ionic liquid or quaternary ammonium salt functionalized ionic liquid; the compound ionic liquid braunification liquid adopts sulfate radical, trifluoro sulfoacid radical and dihydrogen phosphate as negative ions; the density of the obtained braunification liquid is within 1-1.45 g / mL, the pH value is smaller than 4, and the copper loading capacity can reach up to 60 g / L; the braunification liquid has stable binding force with prepregs and good heat resistance, and has remarkable environment-friendly superiority due to the environment-friendly property and nonvolatility of the ionic liquid.

The invention provides a corrosion inhibitor for oil and gas wells, and a preparation method and application thereof. The corrosion inhibitor comprises, by weight (100%), 40 to 60% of an imidazoline derivative, 8 to 40% of organic phosphonate, 30 to 50% of a dispersant and 2 to 15% of a surfactant. The corrosion inhibitor for the oil and gas wells in the invention has high-temperature resistance,stable performance and excellent corrosion inhibition effect, can be used as a broad-spectrum corrosion inhibitor for exploitation in oil and gas fields, and overcomes the shortcomings of conventionalcorrosion inhibitors; the corrosion inhibitor is applicable to crude oil medium environment s in oil well, gas medium environments in gas wells, and water medium environments in water injection wellsin oil fields; and the corrosion inhibitor has good effect on improving the corrosion resistance of metal equipment used in a H2S-CO2-Cl<-> system with high temperature and high salinity during the exploitation of oil and gas wells.

The invention discloses an environment-friendly metal corrosion inhibitor and a preparation method thereof. Inedible cassava starch, canna edulis ker starch and the like are used as raw materials; the raw materials and acrylamide undergo graft copolymerization reaction under the action of a catalyst to form the metal corrosion inhibitor; the catalyst is potassium peroxydisulfate-sodium hydrogensulfite or ammonium persulfate-sodium hydrogensulfite; and the molar ratio of the potassium peroxydisulfate or the ammonium persulfate to the sodium hydrogensulfite is 1:0.5-1:1.5. The product can effectively prevent the corrosion of a metal material, and has the characteristics of low consumption, high corrosion inhibiting efficiency and the like compared with the current common corrosion inhibitor. Meanwhile, the corrosion inhibitor has wide raw material source and low price, is regenerative and non-toxic, can be fully decomposed by organisms and form virtuous circle in the nature, and has good application prospect.

The invention relates to amino acid composite acid cleaning inhibiter and an application method thereof. The inhibiter consists of amino acid, iodized salt and hexadecyl trimethyl ammonium bromide, and the mixing ratio of the three components is 1-5: 1-5: 1-5; the inhibiter is used for industrial acid cleaning together with acid pickling solution, and the application method is as follows: the acid pickling solution is dilute sulphuric acid or dilute hydrochloric acid with 0.1m to 2m of concentration, the weight content of the inhibiter in the acid pickling solution is 0.001g / l to 2.0g / l, the acid cleaning temperature is 20 DEG C to 60 DEG C, and the acid cleaning time is 0.5h to 6h. The invention is mixed inhibiter with amino acid as the main component; amino acid can be well dissolved in water, has no toxin and harm to the environment, is capable of biodegradation, has high restraining efficiency, strong continuity capability and is very potential green inhibiter; in addition, the inhibiter has high efficiency, has no toxin and harm, small dosage and quite low production cost, and opens up a novel field for the safety and high-efficiency utilization of inhibiter.

The invention belongs to the technical field of fuel batteries, and particularly discloses a high-concentration salt alkaline electrolyte which comprises high-concentration sodium potassium salt and an alkaline solution. The invention further discloses application of the electrolyte in preparation of an aluminum-air fuel battery. The invention also provides the alkaline electrolyte and an aluminum-air battery containing the alkaline electrolyte. The high-concentration sodium potassium salt provided by the invention can effectively inhibit anode self-corrosion by inhibiting the activity of water molecules and increasing the activation energy of hydrogen evolution reaction, so that the self-discharge of the battery can be greatly reduced, and meanwhile, the discharge product of the battery can be removed in time and recycled under a cyclic condition. When the high-concentration salt alkaline electrolyte is added to the aluminum-air battery, the corrosion inhibition efficiency can reach 93.55% at most, the specific capacity can reach 2412mAh / g, and the energy density can reach 426Wh / kg or above. Under the same condition, compared with the traditional electrolyte, the electrolyte has the advantage that the service life of the battery is nearly 5 times of the original service life.

The green acid washing corrosion inhibitor consists of berberine hydrochloride 80-98 wt%, epiberberine hydrochloride 0.1-10 wt% and jatrorrhizine hydrochloride 0.1-10 wt%. It is added into acid washing solution of dilute hydrochloric acid or dilute sulfuric acid of 0.1-2 M concentration and the added amount is 0.001-5 kg / cu m. The acid washing solution is then heated to 25-50 deg.c and used in acid washing of steel parts. The present invention can avoid the corrosion of steel, and compared with available acid washing corrosion inhibitor, the present invention has the advantages of low consumption, high corrosion inhibiting efficiency, and powerful lasting effect. The green acid washing corrosion inhibitor is harmful to environment and living being.

The invention relates to a steel (carbon steel) seawater corrosion inhibitor, in particular to a carboxymethyl chitosan oligosaccharide schiff base organic carbon steel seawater corrosion inhibitor and application thereof. The corrosion inhibitor comprises components of one or two of highly water soluble carboxymethyl chitosan oligosaccharide schiff base, disodium hydrogen phosphate and mixture of highly water soluble carboxymethyl chitosan oligosaccharide schiff base and disodium hydrogen phosphate. The corrosion inhibitor in the invention can effectively prevent seawater from corroding carbon steel and has the greatest advantages of small used amount, high corrosion inhibition efficiency and long acting time. The product in the invention is an 'environmentally-friendly' green corrosion inhibitor, has a wide source range and has a promising market prospect and a high application value.

The invention relates to an application method of a compound tungstate corrosion inhibitor of sea water by using the sea water as circulating cooling water, which contains raw materials of tungstate, polyepoxysuccinic acid, sodium gluconate and zinc salts. The application method comprises the following steps: metered by 1L of the sea water, respectively adding 40mg / L of the tungstate, 40mg / L of the polyepoxysuccinic acid, 10mg / L of the sodium gluconate and 4mg / L of the zinc salts to the circulating cooling sea water according to mass concentration; testing the corrosion reaching a standard requirement of the annual corrosion rate of carbon steel specified in China under the conditions that the temperature is 30-60 DEG C and the pH value is 6.5-9.0. The corrosion inhibitor has good dissolubility, no poison and harm to environment, biodegradability, high corrosion inhibition efficiency and strong capacity of sustained action and is a green corrosion inhibitor having excellent development potential. The method for adding the corrosion inhibitor to the sea water is convenient and has low cost.

The invention discloses an inhibitor to inhibit steel erosion for crude oil desalting, dewatering device salt, acid, water mixed agent of refinery under 160 deg. c, which comprises the following steps: synthesizing high temperature inhibitor with 10-99. 5%boric acid and organic amine with mole ratio at 1 : 0. 5-3; mixing with one or above two at will of keto-aldehyde amine inhibitor, imidazoline inhibitor and alkynyl oxygen methyl amine inhibitor completely; getting the product; mixing the 30-2000pp inhibitor with salt, acid and water completely; preventing erosion of device, apparatus and line. This invention is easy and simple, which can be used to processing course of oil refining and oil chemical industry.

The invention discloses a corrosion inhibitor capable of inhibiting carbon steel from corroding in salt water (sea) medium, a preparation method and application thereof, and belongs to the technical field of corrosion inhibition of carbon steel. The corrosion inhibitor comprises 20-40 parts of zinc sulfate, 5-15 parts of calcium gluconate, 5-15 parts of sodium tungstate, 3-10 parts of sodium silicate, 1-3 parts of thiourea, 1-5 parts of ethanolamine phosphate, 0.3-0.8 parts of dodecyl polyglucoside, 0.5-1 part of hexadecanoic acid isopropyl ester, and 30-45 parts of water. The preparation method comprises the following steps: (a) dissolving the calcium gluconate in water according to the proportion, stirring and dissolving; (b) adding the sodium tungstate into the solution obtained by the step (a), stirring and dissolving; (c) sequentially adding zinc sulfate, thiourea, ethanolamine phosphate and dodecyl polyglucoside into the solution obtained by the step (b) according to the proportion, stirring and dissolving, and adding calcium silicate and stirring; (d) adding hexadecanoic acid isopropyl ester according to the proportion and stirring for 10-15 min. The corrosion inhibitor has advantages of high corrosion inhibition efficiency, small dosage, low cost, convenient use, and environmentally friendly type.

The invention relates to water soluble neutralization corrosion inhibitor mainly used for corrosion prevention of metal in a low-temperature light oil part of an oil refinery, and a preparation method thereof. The water soluble neutralization corrosion inhibitor is imidazoline type derivative corrosion inhibitor prepared by using oleic acid, polyene polyamine and quaternization reagent as raw materials, and is prepared by compounding assistant corrosion inhibitor, neutralizing agent and solvent; compared with similar corrosion inhibitor, the additive dosage is low (5-10 ppm); and the corrosion inhibitor has good water solubility, high corrosion inhibition efficiency and good chemical stability and heat stability, and has dual effects of film corrosion inhibitor and neutralization to enable the scene operation to become simple.

The invention relates to a steel product (carbon steel) seawater corrosion inhibitor, in particular to an oligochitosan corrosion inhibitor and an application thereof. The corrosion inhibitor comprises the components of oligochitosan with better water solubility after chitosan degradation or a combination of oligochitosan with one or two of zinc sulfate and hexamethylene tetramine. The corrosion inhibitor can effectively prevent the corrosion of seawater on carbon steel and has the advantages of low use amount, high corrosion inhibition efficiency and strong action duration capability. The product of the invention is an environmental-friendly green corrosion inhibitor and has a wide material source range, a broad market prospect and a good application value.

The invention relates to a volatile corrosion inhibitor containing natural gas with carbon dioxide and mainly solves the problem that carbon dioxide contained in natural gas severely corrodes steel so as to greatly minimize the lifetime of oil and gas well. The volatile corrosion inhibitor comprises the following components of: by weight, 10-20% of N-methyl diethanolamine, 1-3% of Penetrant JFC-2, 3-10% of benzotriazol, 4-15% of 5,7 dinitrogen-8-hydroxyquinoline, and 52-82% of anhydrous ethanol. The content of each component is the weight percent of the gross weight of the corrosion inhibitor. The volatile corrosion inhibitor containing natural gas with carbon dioxide has high inhibition efficiency and will not influence the lifetime of the oil and gas well.

The invention provides a preparation method for a plant acid pickling corrosion inhibitor. According to the preparation method, five pteridophytes serve as raw materials, and the carbon steel acid pickling corrosion inhibitor is prepared through the steps of ultrasonic extraction, extraction separation, alcohol precipitation and impurity removal, concentration and drying and the like. The preparation method has the advantages that the plant acid pickling corrosion inhibitor is extracted from the five pteridophytes for the first time, the highest corrosion inhibition efficiency of the plant acid pickling corrosion inhibitor extracted from the five pteridophytes is 85% or above under an experiment condition, it is illustrated that the industrial value of the pteridophytes for preparing the plant acid pickling corrosion inhibitor is extremely high, the industrial value of the pteridophytes in addition to the aspects of plant taxonomy and pharmacological biology is excavated, and a new application field is developed for the pteridophytes; and compared with a synthesized organic acid pickling corrosion inhibitor, the plant acid pickling corrosion inhibitor has the characteristics of being simple in preparation process, low in production cost, good in water solubility, non-toxic, easily degradable, high in corrosion inhibition efficiency, worthy of large-scale popularization and application and the like.

The invention discloses an environment friendly gas phase corrosion inhibitor used for a direct air cooling system, which consists of the following materials in percentage by weight: 30-40% of organic amine, 20-30% of inorganic ammonium, 20-30% of sodium benzoate and 10-20% of sodium D-isoascorbate, wherein the organic amine is hexamethylentertr-amine, thiourea or carbamide, and the inorganic ammonium is diammonium phosphate, ammonium bicarbonate or ammonium carbonate. The sodium benzoate is commonly used for food preservatives; the diammonium phosphate is used for medicine, feed additives and the like; and the sodium D-isoascorbate is a novel food anti-oxygen and antiseptic fresh-keeping auxochromic agent; and the other components have very low toxicity or have no toxicity. The corrosion inhibitor has no harm on the environment and human body, has the advantages of convenient manufacturing and use, environment protection, high corrosion inhibition efficiency, long-lasting efficacy and the like, and can effectively prevent the direct air cooling system from being corroded.

The invention relates to a corrosion inhibitor for a steel neutral medium, particularly relating to a green sodium alginate corrosion inhibitor for a carbon steel neutral medium as well as an application thereof. The corrosion inhibitor is sodium alginate of which the chemical general formula is (C6H7NaO6)n and the average molecular weight (Mw) is 20000-100000. The sodium alginate corrosion inhibitor disclosed by the invention is a natural product extracted from brown algae, and is widely applied to food industry. The corrosion inhibitor is a copolymer formed by connecting alpha-L-mannuronic acid (M units) with beta-D-guluronic acid through 1,4-glucosidic bonds and composed of different GGGMMM fragments. The alpha-L-mannuronic acid unit contains a large amount of carboxyl and can be coordinated with metals. Compared with the current commonly-used organic corrosion inhibitor, the corrosion inhibitor disclosed by the invention is non-toxic and harmless, thereby having no environmental problem after use. In addition, the corrosion inhibitor is non-toxic and harmless to environment and living beings, thus conforming to development of green corrosion inhibitors.

The invention relates to a corrosion inhibiter for steel acid pickling, in particular to an environment-friendly corrosion inhibiter for carbon steel acid pickling, which can prevent carbon steels and the products from corroding carbon steel materials and over consumption of acidizing fluid in the acid picking process and the application thereof. The component of the corrosion inhibiter is one or the combination of hexanophenone-O-(1, 3, 4-tolyltriazole) methylene oxime, 4- methoxy acetophenone-O-1'- (1', 3', 4'- tolyltriazole) methylene oxime and 4-fluorine acetophenone-O-1'-(1', 3', 4'-tolyltriazole). The application of the corrosion inhibiter is that steels are immerged and washed in acid liquid added with tolyltriazole. The corrosion inhibiter of the invention can effectively prevent acid from corroding the carbon steel materials in acid picking process and has the outstanding advantages of low consumption, high corrosion inhibition efficiency, stable corrosion inhibiting performance and simple synthesis. Besides, the corrosion inhibiter for steel acid pickling of the invention has no pollution to environment, comparatively high productive value and wide market prospect.

The invention discloses a preparation method of a high-temperature corrosion inhibitor for inhibiting petroleum acid corrosion. The preparation method comprises the following steps: weighing p-aminophenol, dissolving the p-aminophenol in a dimethyl formamide (DMF) solution, heating, adding tall oil fatty acid dropwise while stirring, heating after finishing the dropwise adding, continuously stirring for reacting, heating, and separating generated water out of a water segregator through backflow; cooling after no water is distilled off, removing the DMF serving as a solvent from a product under reduced pressure with a rotary evaporator to obtain yellow thick liquid alkyl acylamino phenol; adding concentrated sulfuric acid into the alkyl acylamino phenol for reacting to generate ammonium sulfate, adding a potassium hydroxide solid after finishing the reaction for compounding to obtain a sulfonated fatty acylamino phenol corrosion inhibitor, namely, the high-temperature corrosion inhibitor for inhibiting petroleum acid corrosion. The prepared corrosion inhibitor meets the requirements of high temperature resistance and efficient corrosion inhibition, and is environment-friendly.