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N-heterocyclic carbon steel pickling corrosion inhibitor and application thereof

A technology of pickling corrosion inhibitor and nitrogen heterocyclic ring, which is applied in the field of steel pickling corrosion inhibitor, can solve the problems of poor environmental friendliness, toxic and side effects, etc., achieve excessive corrosion inhibition, strong continuous action ability, and cheap and easy-to-obtain raw materials Effect

Inactive Publication Date: 2009-10-14
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, add 1-phenyl-2-{5-(1,2,4-triazole)-1methyl-(1,3, 35 g of 4-oxadiazole)-2-thio}-ethanone, and immerse the steel to be cleaned in the pickling solution for 3 hours at room temperature.

[0021] The highest corrosion inhibition efficiency obtained through experimental testing is 95%, which shows 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, add 2-(4-tert-butyl-benzylsulfur)-5-(1,2,4-triazole)-methyl -(1,3,4-oxadiazole) 20g, 1-(4-fluorophenyl)-3-{4-(1,2,4-triazole-1-methoxy)-benzene}- 20g of propylene, 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 96%, showing 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, add 1-(4-fluorophenyl)-3-{4-(1,2,4-triazole-1-methoxy) -35g of benzene}-propylene, just immerse 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 93%, showing that it is an efficient corrosion inhibitor.

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PUM

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Abstract

The invention relates to a steel pickling corrosion inhibitor, in particular to an N-heterocyclic carbon steel pickling corrosion inhibitor for avoiding unnecessary corrosion and acid liquor consumption in the pickling process of carbon steel as well as produced products and an application thereof. The corrosion inhibitor is a triazole or oxadiazole heterocyclic compound or the combination thereof and is submerged with cleaning liquid added with the corrosion inhibitor for washing the carbon steel; and the cleaning liquid is pickling liquor with the concentration of 0.1mol / L-1mol / L, and each liter of acid liquor is added with 0.00-2.0g of corrosion inhibitor and submerged for 0.5-4 h. The corrosion inhibitor includes the triazole heterocyclic compound which has the characteristics of no poison, innocuity, easy synthesis and low price and easily obtained raw materials; and the corrosion inhibitor is adopted for cleaning the carbon steel and the surfaces of the products thereof and can avoid the excessive corrosion of the matrix metal and the excessive consumption of the acid liquor in the pickling process and has the advantages of low consumption and efficiency and continuous capability.

Description

technical field [0001] The invention relates to steel pickling corrosion inhibitors, specifically a nitrogen-heterocyclic high-efficiency carbon steel acid 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 Corrosion inhibitors and their applications. 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] The most commonly used acids for pickling are hydrochloric acid, sulfuric acid, citric acid, etc., but because strong acids have a corrosive effect on metal equipment, the phenomenon of "over-corrosion" often occurs duri...

Claims

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Application Information

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IPC IPC(8): C23F11/14C23F11/16
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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