Chitosan carbon steel restrainer and use thereof

A technology of corrosion inhibitor and carbon steel acid, which is applied in the field of chitosan carbon steel pickling corrosion inhibitor, can solve the problems of not having market competitiveness, not adapting to global environmental protection requirements, toxic and side effects of cleaning agents, etc. Achieve the effect of low price, prevent excessive corrosion of metal, and strong continuous effect

Inactive Publication Date: 2009-11-18
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Currently commonly used cleaning agents mainly include toxic inorganic corrosion inhibitors such as chromate, nitrate, and nitrite, as well as some organic phosphorus corrosion inhibitors, whose discharge may cause eutrophication of water bodies. Most cleaning agents have toxic and side effects, do not have market competitiveness, and do not meet the worldwide environmental protection requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The corrosion inhibitor contains 35g hydroxypropyl chitosan or 35g carboxymethyl chitosan, which is added to 100L of dilute hydrochloric acid with a concentration of 0.1M, and the steel to be cleaned is immersed in the pickling solution at room temperature Medium 4h can be.

[0018] The highest corrosion inhibition efficiency obtained through experimental testing is 95% / 93%, which shows that it is an efficient cleaning agent.

Embodiment 2

[0020] The corrosion inhibitor contains 20g hydroxypropyl chitosan and 20g carboxymethyl chitosan, which is added to 100L of dilute hydrochloric acid with a concentration of 0.1M, and the steel to be cleaned is immersed in the pickling solution at room temperature Medium 4h can be.

[0021] The highest corrosion inhibition efficiency obtained through experimental testing is 96%, which shows that it is an efficient cleaning agent.

Embodiment 3

[0023] Described corrosion inhibitor contains 20g hydroxypropyl chitosan and 20g carboxymethyl chitosan, it is added in 100L concentration and is the dilute hydrochloric acid of 1M, under room temperature condition, the steel material to be cleaned is immersed in pickling solution 2 hours is enough.

[0024] The highest corrosion inhibition efficiency obtained through experimental testing is 92%, which shows that it is an efficient cleaning agent.

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PUM

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Abstract

The invention relates to a chitosan carbon steel restrainer, which comprises components that are more than one selected from hydroxypropyl chitosan and carboxymethyl chitosan. The use of chitosan carbon steel restrainer is that the restrainer can be added into cleaning solution to clean steel by immersion. The cleaning solution is acid liquor, the addition amount of the restrainer in the acid liquor is 0.001 to 3.0 g/L, and the immersion is performed at room temperature for 0.5 to 4 hours. The product of the invention is used for surface cleaning of carbon steel and carbon steel product and the method can prevent over metal etching and excessive acid liquor consumption during cleaning and has the outstanding advantages of low price, low dosage, high efficiency and high continuous acting force.

Description

technical field [0001] The invention belongs to the technical field of corrosion inhibitor production, in particular to a chitosan-based carbon steel pickling corrosion inhibitor used to prevent carbon steel and its products from unnecessary corrosion and acid consumption in the pickling process and its application . Background technique [0002] Steel is used more and more widely. In the process of product processing and application, dilute sulfuric acid or dilute hydrochloric acid is often used to clean the surface to remove the oxide film or corrosion products on the surface. Since strong acid has a corrosive effect on metal equipment, it is often used in the pickling process. The phenomenon of "over-corrosion" occurs. This process will not only cause corrosion of metal materials, but also produce a large amount of acid, which will cause serious damage to the environment. In order to avoid excessive consumption of metal or acid during pickling and prevent harmful corrosi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/06C23G1/08
Inventor 庞雪辉隋卫平翟利民谭福能张洁高创
Owner UNIV OF JINAN
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