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1-ethyl-2-substituted benzimidazole carbon steel acid pickling inhibitor and applications thereof

A technology of benzimidazole and pickling corrosion inhibitor, which is used in the field of metal surface corrosion and corrosion inhibitor production, can solve the problems of toxic side effects, poor environmental friendliness, etc. small effect

Inactive Publication Date: 2015-04-15
NANJING UNIV OF TECH
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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

[0017] The acid lotion is dilute hydrochloric acid, the concentration is 1mol / L, the amount of the acid lotion is 100L, and 5g of 1-ethyl-2-(4-(N,N-diphenyl)aminophenyl)benzimidazole is added. The steel to be cleaned was immersed in the pickling solution for 18 hours at ℃.

[0018] The highest corrosion inhibition efficiency obtained through experimental tests is 89%, which shows that it is an efficient corrosion inhibitor.

Embodiment 2

[0020] The acid lotion is dilute hydrochloric acid, the concentration is 1mol / L, the amount of the acid lotion is 100L, and 10g of 1-ethyl-2-(4-(N,N-diphenyl)aminophenyl)benzimidazole is added. The steel to be cleaned was immersed in the pickling solution for 18 hours at ℃.

[0021] The highest corrosion inhibition efficiency obtained through experimental testing is 93%, which shows that it is an efficient corrosion inhibitor.

Embodiment 3

[0023] The acid lotion is dilute hydrochloric acid, the concentration is 1mol / L, the amount of the acid lotion is 100L, and 15g of 1-ethyl-2-(4-(N,N-diphenyl)aminophenyl)benzimidazole is added. The steel to be cleaned was immersed in the pickling solution for 18 hours at ℃.

[0024] The highest corrosion inhibition efficiency obtained through experimental testing is 96%, which shows that it is an efficient corrosion inhibitor.

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PUM

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Abstract

The invention relates to the technical field of production of corrosion inhibitors for preventing metal surface corrosion, and specifically relates to a 1-ethyl-2-substituted benzimidazole carbon steel acid pickling inhibitor, which can prevent unnecessary corrosion and excess acid consumption during the hydrochloric acid pickling process, and applications thereof. The acid pickling inhibitor is 1-ethyl-2-(4-(N,N-diphenyl)aminophenyl)benzimidazole or 1-ethyl-2-((4-carbazole-9-yl)phenyl)benzimidazole. The provided acid pickling inhibitor can effectively prevent the hydrochloric acid corrosion on carbon steel during the pickling process and has the advantages of little using amount, high carrions inhibition efficiency, stable property, and environment-friendliness. The provided acid pickling inhibitor has a high production value and wide market prospect.

Description

Technical field [0001] The invention relates to the technical field of metal surface corrosion and corrosion inhibitor production, in particular to prevent unnecessary corrosion of carbon steel and its products in the hydrochloric acid pickling process and excessive consumption of acid liquid-a kind of 1-ethyl-2 -Substituted benzimidazole high-efficiency carbon steel pickling corrosion inhibitor and its application. Background technique [0002] In the metal materials, machinery, metallurgy, chemical and other industries, strong acid cleaning of surface rust and dirt is an important cleaning method for surface pretreatment of metal materials, and cleaning and descaling of pipelines and boiler systems. Pickling can reduce fuel consumption due to fouling, reduce fuel exhaust gas and air pollution, and reduce the possibility of pipe bursts caused by fouling. Therefore, pickling is of great significance to maintaining the normal operation of the equipment and is a convenient, effici...

Claims

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Application Information

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IPC IPC(8): C23G1/06C23G1/08
CPCC23G1/063C23G1/08
Inventor 杨文忠徐斌刘瑛尹晓爽徐洁施红
Owner NANJING UNIV OF TECH
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