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Environment-friendly carbon steel restrainer and uses thereof

An environmentally friendly, corrosion inhibitor technology, applied in the field of steel pickling corrosion inhibitors, can solve the problems of toxic side effects, poor environmental friendliness, etc., and achieve the effects of strong continuous action ability, inhibition of excessive corrosion, and low cost

Inactive Publication Date: 2008-08-20
INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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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, 35g of valerophenone-O-1-(1.3.4-triazole) methylene oxime is added, and the to-be-cleaned The steel is immersed in the pickling solution for 3h.

[0021] The highest corrosion inhibition efficiency obtained through experimental testing is 97%, showing 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-fluoroacetophenone-O-1'-(1'.3'.4'-triazole) methylene oxime is added 20 g and 20 g of valerone-O-1-(1.3.4-triazole) methylene oxime, and immerse the steel to be cleaned in the pickling solution for 3 hours at room temperature.

[0024] The highest corrosion inhibition efficiency obtained through experimental testing is 94%, which shows 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, and 35g of 4-fluoroacetophenone-O-1'-(1'.3'.4'-triazole)methylene oxime is added , Submerge the steel to be cleaned in the pickling solution for 3 hours at room temperature.

[0027] The highest corrosion inhibition efficiency obtained through experimental testing is 88%, which shows 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 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.

Description

technical field [0001] The invention relates to steel pickling corrosion inhibitors, in particular to an environmentally friendly carbon steel pickling inhibitor 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. etchant and its application. 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 proc...

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
Owner INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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