Green oxadiazoles carbon steel restrainer and uses thereof

A technology of pickling corrosion inhibitors and triazoles, which is applied in the field of steel pickling corrosion inhibitors, can solve the problems of poor environmental friendliness, toxic and side effects, etc., and achieve the advantages of inhibiting excessive corrosion, strong continuous action ability, and low cost Effect

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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Currently commonly used corrosion inhibitors mainly include inorganic compounds such as chromate, nitrate, and nitrite. Due to their toxic side effects and poor environmental friendliness, their application is being restricted and will be phased out.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The pickling solution is dilute hydrochloric acid, the concentration is 0.5M, the amount of pickling solution is 100L, and 4-methylacetophenone-O-1'-(1'.3'.4'-triazole) methylene oxime is added 30g, immerse the steel to be cleaned in the pickling solution for 4 hours at room temperature.

[0021] The highest corrosion inhibition efficiency obtained through experimental testing is 95%, which shows that it is an efficient corrosion inhibitor.

Embodiment 2

[0023] The pickling solution is dilute hydrochloric acid, the concentration is 0.5M, the amount of pickling solution is 100L, and 4-methylacetophenone-O-1'-(1'3'4-triazole) methylene oxime, 1 -(4'-N,N-Dimethylbenzimido)-2-mercapto-5-[1"-(1"3"4"-triazole)methylene]-1,3, 20g of 4-triazole, and immerse the steel to be cleaned in the pickling solution for 4 hours at room temperature.

[0024] The highest corrosion inhibition efficiency obtained through experimental testing is 97%, showing that it is an efficient corrosion inhibitor.

Embodiment 3

[0026] The pickling solution is dilute hydrochloric acid, the concentration is 1M, the amount of pickling solution is 100L, add 1-(4′-N,N-dimethylbenzylimino)-2-mercapto-5-[1″-(1 "3"4"-triazole) methylene]-1,3,4-triazole 40g, immerse the steel to be cleaned in the pickling solution for 4 hours at room temperature.

[0027] The highest corrosion inhibition efficiency obtained through experimental testing is 93%, showing that it is an efficient corrosion inhibitor.

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PUM

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Abstract

The invention relates to a corrosion inhibiter for acid pickling steels, in particular to an environment-friendly triazole corrosion inhibiter for acid pickling carbon steels, can avoid the corrosion of acid to carbon steel and products thereof in the acid picking process and over consumption of acidizing fluid and application thereof. The components of corrosion inhibiter are 4-methoxy acetophenone-O-1'- (1', 3', 4'-ltriazole) methylene oxime and/or 1- (4'- N, N-dimethyl benzene methylene imino) - 2 - sulfhydryl -5- (1'(1', 3', 4'-triazole) methylene)-1, 3, 4-triazole. The corrosion inhibiter of the invention can effectively prevent corrosion of acid to carbon steel materials in the acid picking process and has the outstanding advantages of low consumption, high corrosion inhibition efficiency, and stable corrosion inhibiting performance. Besides, the corrosion inhibiter for acid pickling steels of the invention has no pollution to environment with wide market prospect.

Description

technical field [0001] The invention relates to steel pickling corrosion inhibitors, specifically a green triazole carbon steel acid used to prevent acid corrosion of carbon steel materials and excessive consumption of acid solution in the pickling process of carbon steel and its products Corrosion inhibitors and their applications. Background technique [0002] Strong acid cleaning of surface rust and dirt is an important cleaning method for surface pretreatment of metal materials, cleaning and descaling of pipes and boiler systems. Because pickling is of great significance to maintain the normal operation of equipment, it is still widely used in metal materials, machinery, metallurgy, chemical industry and other industries. [0003] Because strong acid has a corrosive effect on metal equipment, the phenomenon of "over-corrosion" often occurs in the pickling process, that is, not only the rust and dirt on the metal surface are removed during the pickling process, but also ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/02C23G1/06C23G1/08
Inventor 李伟华庞雪辉何桥裴长岭王爱华侯保荣
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