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Metal zinc coating blackening agent and preparation method thereof

A technology of galvanized layer and blackening agent, which is applied in the coating process of metal materials, etc., can solve the problems of poor adhesion and wear resistance, high energy consumption, and high pretreatment requirements, and achieve good adhesion, simple process, and durability Corrosive effect

Active Publication Date: 2011-04-27
合肥华清高科表面技术股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the production cycle of this process is long, the energy consumption is large, and sodium nitrite is a recognized carcinogen, and the working environment is harsh
This has led many researchers to carry out a large amount of research work on the new blackening process in recent years, but for the blackening treatment of the metal galvanized layer, although the existing research work has made some progress, it is technically in general Not perfect yet, there are high requirements for pre-treatment, poor adhesion and wear resistance, many of which contain selenium salts in the blackening solution, resulting in high cost, and the selenium salts are also more harmful to the environment and human body

Method used

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  • Metal zinc coating blackening agent and preparation method thereof

Examples

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Effect test

Embodiment 1

[0026] (1) Add 40 parts of water in the reaction vessel, then add 20 parts of the main film-forming substance ammonium molybdate and 0.7 part of copper sulfate, stir to make it dissolve completely, and prepare the semi-finished product treatment liquid;

[0027] (2) Add 2.5 parts of nickel sulfate, 1 part of sodium sulfite, 2.5 parts of sodium thiosulfate, 4 parts of aluminum chloride, 3.5 parts of zinc chloride, 7.5 parts of potassium chloride in step (1) semi-finished product treatment liquid again, stir to make It is completely dissolved to obtain a semi-finished product treatment liquid;

[0028] (3) add 0.3 part of complexing agent ascorbic acid in step (2) semi-finished product treatment liquid again, stir and make it dissolve completely, then adjust its pH value at 1.5 with acetic acid, both obtained blackening agent of the present invention.

Embodiment 2

[0030] (1) Add 60 parts of water in the reaction vessel, then add 25 parts of the main film-forming substance ammonium molybdate and 0.5 part of copper sulfate, stir to make it dissolve completely, and prepare the semi-finished product treatment liquid;

[0031] (2) Add 3 parts of nickel sulfate, 3 parts of sodium sulfite, 3.5 parts of sodium thiosulfate, 3.5 parts of aluminum chloride, 3 parts of zinc chloride, 8 parts of potassium chloride in step (1) semi-finished product treatment liquid again, stir to make It is completely dissolved to obtain a semi-finished product treatment liquid;

[0032] (3) Add 0.5 part of complexing agent citric acid in step (2) semi-finished product treatment liquid again, stir to all dissolvings, then adjust its pH value at 1.0 with acetic acid, both obtained blackening agent of the present invention.

Embodiment 3

[0034] (1) Add 50 parts of water in the reaction vessel, then add 22 parts of the main film-forming substance ammonium molybdate and 0.6 part of copper sulfate, stir to make it dissolve completely, and prepare the semi-finished product treatment liquid;

[0035] (2) Add 2 parts of nickel sulfate, 2 parts of sodium sulfite, 3 parts of sodium thiosulfate, 4.5 parts of aluminum chloride, 4 parts of zinc chloride, 7 parts of potassium chloride successively in step (1) semi-finished product treatment liquid, stir Dissolve it completely to obtain a semi-finished treatment solution;

[0036] (3) add 0.4 part of complexing agent Hydroquinone to step (2) semi-finished product treatment liquid again, stir to all dissolvings, then adjust its pH value at 1.2 with acetic acid, both obtained blackening agent of the present invention.

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Abstract

The invention discloses a metal zinc coating blackening agent and a preparation method thereof. The metal zinc coating blackening agent consists of the following raw materials in parts by weight: 20 to 25 parts of ammonium molybdate, 0.5 to 0.7 part of copper sulfate, 2 to 3 parts of nickel sulfate, 1 to 3 parts of sodium sulfite, 2.5 to 3.5 parts of sodium thiosulfate, 3.5 to 4.5 parts of aluminum chloride, 3 to 4 parts of zinc chloride, 7 to 8 parts of potassium chloride, 0.3 to 0.5 part of complexing agent, proper amount of pH value regulator, and 40 to 60 parts of water, wherein the pH value of the metal zinc coating blackening agent is between 1.0 and 1.5. The blackening agent can form a blackening film layer with high compactness, high adhesive force and strong corrosion resistance on the surface of the zinc coating; and the blackening process is simple, and the blackening agent is non toxic and environment-friendly.

Description

technical field [0001] The invention relates to a metal blackening agent, in particular to a metal galvanized layer blackening agent and a preparation method thereof. Background technique [0002] Galvanized metal is widely used in industry. It has good corrosion resistance and natural appearance. It is very suitable for general applications. However, because industrial metal parts often need to be used in special environments such as humidity and high temperature, this requires it to have Even better performance. [0003] In order to meet the market demand, people have made many attempts to change the surface properties of the metal galvanized layer, and also developed some related products and processes. The work mainly focuses on the chemical blackening of the metal galvanized layer. Surface blackening technology has been used in the surface protection and decoration of various metal products for many years, but the traditional process uses an alkaline process containing...

Claims

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Application Information

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IPC IPC(8): C23C22/40
Inventor 刘万青饶丹
Owner 合肥华清高科表面技术股份有限公司
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