A kind of zinc corrosion inhibitor in hydrochloric acid medium and its preparation method and application

A technology of corrosion inhibitor and medium, applied in the field of zinc corrosion inhibitor and its preparation, can solve the problems of low zinc potential and accelerate the corrosion effect of zinc film, and achieve the effects of short time, easy discharge and production cost saving.

Active Publication Date: 2020-07-10
HENAN CHEM IND RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although hydrochloric acid has a very good effect in descaling, when using hydrochloric acid to clean the heat exchange tube covered with zinc film, zinc is an active metal, and both the zinc element and the zinc oxide film are easily mixed with strong acid (hydrochloric acid). reaction, and the potential of zinc is low, therefore, if the corrosion inhibitor is not properly added during the cleaning process, the corrosion of the zinc film will be further accelerated

Method used

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  • A kind of zinc corrosion inhibitor in hydrochloric acid medium and its preparation method and application
  • A kind of zinc corrosion inhibitor in hydrochloric acid medium and its preparation method and application
  • A kind of zinc corrosion inhibitor in hydrochloric acid medium and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A zinc corrosion inhibitor in hydrochloric acid medium, the corrosion inhibitor is prepared from the following raw materials in parts by weight: 2.0g phthalocyanine, 3.0g chitosan, 0.5g methylpyrrolidone, 0.8g thiourea, 1.5g ten Hexaalkylammonium bromide, 1.0g cinnamaldehyde, 2.0g hydroxypropyl cross-linked starch, 1.0g butynediol, mixed solvent (DMF30g, glacial acetic acid 25g, acetone 20g, ethanol 13.2g), fully stirred, heated to 50~80℃, completely dissolve the solute in the solvent, and set aside.

[0037] Adopt the corrosion inhibition rate and the corrosion rate of this corrosion inhibitor prepared by weight loss test to zinc, the steps are as follows:

[0038] Prepare 6 parts of the same hydrochloric acid with a mass percentage of 6% each 100ml, and carry out numbering 1, 2, 3, 4, 5, 6; then add the buffer prepared above from No. 1 to No. Etchant 0.5g, 1.0g, 1.5g, 2.0g, 2.5g and 3.0g, stir and mix well;

[0039] Take 6 pieces of zinc test pieces with a specifica...

Embodiment 2

[0047] A zinc corrosion inhibitor in hydrochloric acid medium, the corrosion inhibitor is prepared from the following raw materials in parts by weight: 2.0g cobalt phthalocyanine, 3.0g chitosan, 0.5g methylpyrrolidone, 1.0g thiourea, 1.8g Cetyl ammonium bromide, 1.2g cinnamaldehyde, 2.0g sodium carboxymethylcellulose, 1.0g butynediol, mixed solvent (DMF 30g, glacial acetic acid 25g, acetone 20g, ethanol 6g, butyl acetate 6.5g ), fully stirred, heated to 50-80°C to completely dissolve the solute in the solvent, and set aside.

[0048] Adopt the corrosion inhibition rate and the corrosion rate of this corrosion inhibitor prepared by weight loss test to zinc, the steps are as follows:

[0049] Prepare 6 parts of the same hydrochloric acid with a mass percentage of 6% each 100ml, and carry out numbering 1, 2, 3, 4, 5, 6; then add the buffer prepared above from No. 1 to No. Etchant 0.5g, 1.0g, 1.5g, 2.0g, 2.5g and 3.0g, stir and mix well;

[0050] Take 6 pieces of zinc test piece...

Embodiment 3

[0057] A zinc corrosion inhibitor in hydrochloric acid medium, the corrosion inhibitor is prepared from the following raw materials in parts by weight: 2.0g zinc phthalocyanine, 3.0g chitosan, 1.0g methylpyrrolidone, 0.8g thiourea, 1.5g Cetyl ammonium bromide, 1.5g cinnamaldehyde, 2.0g sodium carboxymethylcellulose, 1.5g butynediol, mixed solvent (DMF 30g, glacial acetic acid 25g, acetone 20g, ethanol 5g, glycerin 6.7g ), fully stirred, heated to 50-80°C to completely dissolve the solute in the solvent, and set aside.

[0058] Adopt the corrosion inhibition rate and the corrosion rate of this corrosion inhibitor prepared by weight loss test to zinc, the steps are as follows:

[0059] Prepare 6 parts of the same hydrochloric acid with a mass percentage of 6% each 100ml, and carry out numbering 1, 2, 3, 4, 5, 6; then add the buffer prepared above from No. 1 to No. Etchant 0.5g, 1.0g, 1.5g, 2.0g, 2.5g and 3.0g, stir and mix well;

[0060] Take 6 pieces of zinc test pieces with ...

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PUM

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Abstract

The invention provides a zinc corrosion inhibitor for a hydrochloric acid medium and a preparation method and application thereof. The zinc corrosion inhibitor is prepared by the following componentsof solute phthalocyanine and metal phthalocyanine compounds, chitosan compounds, polyhydroxy compounds, nitrogen compounds, sulfur compounds, quaternary ammonium salt compounds, aldehyde compounds andacetylene compounds, as well as solvent DMF (dimethyl formamide), glacial acetic acid, acetone, polyhydric alcohols and / or butyl acetate. The zinc corrosion inhibitor has the advantages that while the water scale at the surface layer of an evaporation cold type heat exchange pipe is thoroughly cleaned by the hydrochloric acid, the good protection function is realized on the zinc at the surface ofthe pipe body, and the corrosion inhibition rate can reach 98% or above; the good protection and anti-corrosion functions are realized on the zinc with high activity; the corrosion inhibitor is simple and safe, and is very suitable for industrialized application.

Description

technical field [0001] The invention relates to the technical field of corrosion and protection. In particular, it relates to a zinc corrosion inhibitor in hydrochloric acid medium, its preparation method and application. [0002] technical background [0003] Zinc is an important non-ferrous metal with the advantages of non-toxicity, low price and easy processing. In the environment of atmosphere, fresh water and other neutral media, a dense oxide film is easy to form on the surface of zinc, which has good stability. Therefore, zinc is widely used in protective coating materials of metals such as steel. [0004] In order to prevent corrosion by various factors in the environment, traditional evaporative cooling pipe heat exchange equipment often uses stainless steel pipes, but stainless steel pipes are expensive and do not use industrialized large-scale applications. In order to reduce the cost of evaporative cooling and heat exchange equipment, carbon steel pipes are com...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23G1/06C23G1/10
CPCC23G1/06C23G1/10
Inventor 谢云漫王敬臣李玉峰李玉敏刘玉林谢存明吴建波谢志涛杨献红赵怡丽袁竹青邵永涛王芳陈昊马欣乔桂芳陈蕾刘秀伟李娟袁琳黄蓓李佳珂李长林阮晨蕾罗迎娣
Owner HENAN CHEM IND RES INST
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