Blue and white passivating agent preparation method

A passivating agent, blue-white technology, applied in the direction of metal material coating process, etc., can solve the problems of high cost, poor film quality, complex process, etc., achieve low cost, excellent corrosion resistance, uniform film formation Effect

Inactive Publication Date: 2014-04-02
天津祥和兴金属制品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing chromium-free passivation technology still has disadvantages such as poor film quality, complicated process, and high cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] The formula is: chromium trichloride is 15g / L, KH550 is 2g / L, cobalt sulfate is 1g / L, sodium nitrate is 8g / L, malonic acid is 10g / L, ammonium bifluoride is 2g / L and deionized water The ratio is made, the operating temperature: 40 ℃, the pH value is controlled at: 1.8. The passivation time is 55 seconds, the surface color of the metal zinc layer is uniform blue-white, and there is a uniform passivation film on the surface.

Embodiment 2

[0010] The formula is: 10g / L of chromium trichloride, 1g / L of KH550, 1g / L of cobalt sulfate, 6g / L of sodium nitrate, 4g / L of malonic acid, 5g / L of ammonium bifluoride and deionized water Proportioned, operating temperature: 45°C, pH value controlled at: 1.5. The passivation time is 55 seconds, the surface color of the metal zinc layer is blue-white, and there is a uniform passivation film on the surface.

[0011]

Embodiment 3

[0013] The formula is: chromium trichloride is 15g / L, KH550 is 5g / L, cobalt sulfate is 2g / L, sodium nitrate is 5g / L, malonic acid is 10g / L, ammonium bifluoride is 5g / L and deionized water The ratio is made, the operating temperature: 40 ℃, the pH value is controlled at: 1.8. The passivation time is 30 seconds, the surface color of the metal zinc layer is blue-white, and there is a uniform passivation film on the surface.

[0014]

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PUM

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Abstract

The invention discloses a blue and white passivating agent preparation method. A formula of a blue and white passivating agent comprises chromium trichloride, KH550, cobalt sulfate, sodium nitrate, propane diacid, ammonium bifluoride and deionized water. A trivalent chromium passivating film developed in the invention has the advantages of brilliant color, uniform film formation, and excellent corrosion resistance. A passivatign liquid has the advantages of stable performances, low cost and price, and good performances.

Description

technical field [0001] The present invention relates to a kind of preparation method of the passivating agent that is used for metal zinc surface passivation treatment, relates in particular to A preparation method of a blue-white passivator. Background technique [0002] It is well known that hexavalent chromium is highly toxic and pollutes the environment. Therefore, the passivation treatment of metal zinc surface must seek non-polluting hexavalent chromium replacement technology, and the alternative technologies that have appeared now include chromium-free passivation and trivalent chromium passivation. However, the existing chromium-free passivation technology still has disadvantages such as poor film quality, complicated process, and high cost. [0003] The trivalent chromium compound is an important substance constituting the passivation film and is the skeleton of the film layer. The experiment proves that the trivalent chromium passivation process can achieve the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/34
Inventor 杨其祥
Owner 天津祥和兴金属制品有限公司
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