Carbon steel pickling benzimidazole corrosion inhibitor and application thereof

A technology of pickling corrosion inhibitor and benzimidazoles, which is applied in the field of benzimidazoles high-efficiency carbon steel pickling corrosion inhibitors, can solve the problems of poor environmental friendliness, toxic and side effects, etc., and achieve the suppression of excessive corrosion and continuous effect The effect of strong ability and cheap and easy-to-obtain raw materials

Inactive Publication Date: 2015-05-20
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 pickling solution is dilute hydrochloric acid, the concentration is 1mol / L, the amount of pickling solution is 100L, 5g of 1-butyl-2-(4-methylphenyl)benzimidazole is added, and the steel to be cleaned is Immerse in pickling solution for 24h.

[0018] The highest corrosion inhibition efficiency obtained through experimental testing is 83%, showing that it is an efficient corrosion inhibitor.

Embodiment 2

[0020] The pickling solution is dilute hydrochloric acid, the concentration is 1mol / L, the amount of pickling solution is 100L, 10g of 1-butyl-2-(4-methylphenyl)benzimidazole is added, and the steel to be cleaned is Immerse in pickling solution for 24h.

[0021] The highest corrosion inhibition efficiency obtained through experimental testing is 91%, showing that it is an efficient corrosion inhibitor.

Embodiment 3

[0023] The pickling solution is dilute hydrochloric acid, the concentration is 1mol / L, the amount of pickling solution is 100L, 15g of 1-butyl-2-(4-methylphenyl)benzimidazole is added, and the steel to be cleaned is Immerse in pickling solution for 24h.

[0024] 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 the technical fields of metal surface corrosion and corrosion inhibitor production, and concretely relates to a carbon steel pickling benzimidazole corrosion inhibitor for preventing unnecessary corrosion and acid solution excess consumption in the hydrochloric acid pickling process of carbon steel and products thereof, and an application thereof. The corrosion inhibitor is one of 1-butyl-2-(4-methylphenyl)benzimidazole and 1-ethyl-2-(4-bromophenyl)benzimidazole. The corrosion inhibitor can effectively prevent the corrosion of hydrochloric acid to carbon steel materials in the pickling process, and has the advantages of low dosage, high corrosion inhibition efficiency, stable performances, environmental protection, high production values and wide market prospect.

Description

technical field [0001] The invention relates to the technical field of metal surface corrosion and corrosion inhibitor production, specifically a benzimidazole-based high-efficiency carbon steel used to prevent unnecessary corrosion and excessive consumption of acid solution in the process of hydrochloric acid pickling of carbon steel and its products. Steel pickling corrosion inhibitor and its application. Background technique [0002] In metal materials, machinery, metallurgy, chemical industry and other industries, strong acid cleaning of surface rust and dirt is an important cleaning method for surface pretreatment of metal materials, cleaning and descaling of pipelines and boiler systems. Pickling can reduce fuel consumption caused by dirt, reduce fuel exhaust gas and air pollution, and reduce the possibility of pipe burst caused by local elevation of pipeline due to dirt. Therefore, pickling is of great significance to maintain the normal operation of equipment, and i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/06C23G1/08
CPCC23G1/063C23G1/08
Inventor 杨文忠徐斌吴迪刘瑛尹晓爽施红
Owner NANJING UNIV OF TECH
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