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Green benzoic acid heterocyclic carbon steel restrainer and application thereof

A technology of pickling corrosion inhibitor and benzoic acid, which is applied in the field of pickling corrosion inhibitor for steel, can solve the problems of poor environmental friendliness, toxic and side effects, and achieves inhibition of excessive corrosion, strong continuous action ability and good use effect. Effect

Inactive Publication Date: 2009-11-25
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

[0019] The pickling liquid is dilute hydrochloric acid, the concentration is 0.5M, the amount of pickling liquid is 100L, the active ingredient is 3,5-dimethylbenzoic acid-1,2,4-triazole-1-methyl ester 30g, in Submerge the steel to be cleaned in the pickling solution for 6 hours at a temperature of 25°C.

[0020] The highest corrosion inhibition efficiency obtained through experimental testing is 98%, which shows that it is an efficient corrosion inhibitor.

Embodiment 2

[0022] The pickling solution is dilute hydrochloric acid, the concentration is 0.5M, the amount of pickling solution is 100L, the active ingredient is 4-chloro-benzoic acid-1,2,4-triazole-1-methyl ester 30g, and the temperature is 25 Under the condition of ℃, immerse the steel to be cleaned in the pickling solution for 6h.

[0023] The highest corrosion inhibition efficiency obtained through experimental testing is 97%, which shows that it is an efficient corrosion inhibitor.

Embodiment 3

[0025] The pickling solution is dilute hydrochloric acid, the concentration is 0.5M, the amount of pickling solution is 100L, and the active ingredients are 15g of 3,5-dimethylbenzoic acid-1,2,4-triazole-1-methyl ester, 4 - Chloro-benzoic acid-1,2,4-triazole-1-methyl ester 15g, immerse the steel material to be cleaned in the pickling solution at a temperature of 25°C for 6h.

[0026] The highest corrosion inhibition efficiency of 99% is obtained through experimental tests, which shows that it is an efficient corrosion inhibitor.

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PUM

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Abstract

The invention relates to a steel (carbon steel) restrainer, in particular to a benzoic acid heterocyclic carbon steel restrainer used for preventing carbon steel materials and products thereof from corrosion during the acid cleaning and reducing the excessive consumption of acid liquor and application thereof. The effectively ingredient of the restrainer is one or the combination of two of 3, 5-methyl benzoic acid-1, 2, 4-triazole-1-monmethyl ester and 4-benzoic acid-1, 2, 4-triazole-1-monmethyl ester. The restrainer can effectively prevent the carbon steel from being corroded by acid during the acid cleaning and has the remarkable advantages of low consumption, high inhibition efficiency and stable inhibition property. The product has no pollution to the environment and has wide market prospect.

Description

technical field [0001] The invention relates to steel pickling corrosion inhibitors, specifically to prevent acid corrosion of carbon steel materials and excessive consumption of acid solution in the pickling process of carbon steel and its products. Carbon steel pickling corrosion inhibitor 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 process, but also part of the metal sub...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F11/14
Inventor 李伟华张胜涛陶志华邓俊英田惠文侯保荣
Owner INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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