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Preparation method of trivalent chromium colored passivator

A passivating agent and trivalent chromium technology, which is applied in the field of preparing trivalent chromium color passivating agents, can solve the problems of poor film quality, complicated process and high cost, and achieve low cost, uniform film formation and high performance. stable effect

Inactive Publication Date: 2014-03-26
TIANJIN DAGANG GALVANIZED FACTORY
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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 sulfate is 3.0ml / L, sodium silicate is 1g / L, cobalt nitrate is 1g / L, sodium nitrate is 5g / L, malonic acid is 3g / L, nickel sulfate is 0.8g / L and It is made of ionized water, the operating temperature is 20°C, and the pH value is controlled at: 2.2. The passivation time is 80 seconds, the surface color of the metal zinc layer is multicolored, the main color is pink, and there is a uniform passivation film on the surface.

Embodiment 2

[0010] The formula is: chromium sulfate is 5.0ml / L, sodium silicate is 2g / L, cobalt nitrate is 2g / L, sodium nitrate is 8g / L, malonic acid is 5g / L, nickel sulfate is 1.2g / L and It is made of ionized water, the operating temperature is 25°C, and the pH value is controlled at 2.0. The passivation time is 80 seconds, the surface color of the metal zinc layer is multicolored, the main color is green, and there is a uniform passivation film on the surface.

Embodiment 3

[0012] The formula is: chromium sulfate is 4.0ml / L, sodium silicate is 1.5g / L, cobalt nitrate is 1.5g / L, sodium nitrate is 6g / L, malonic acid is 4g / L, nickel sulfate is 1g / L and It is made of deionized water, the operating temperature is 30°C, and the pH value is controlled at 1.8. The passivation time is 20 seconds, the surface color of the metal zinc layer is multicolored, and there is a uniform passivation film on the surface.

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PUM

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Abstract

The invention provides a preparation method of a trivalent chromium colored passivator. The trivalent chromium colored passivator is composed of chromic sulfate, sodium silicate, cobalt nitrate, sodium nitrate, malonic acid, nickel sulfate and deionized water. The trivalent chromium passivating film has the advantages of bright color and high uniformity. The corrosion resistance is favorable. The passivation solution has the advantages of stable performance, low cost price and favorable properties.

Description

technical field [0001] The invention relates to a preparation method of a passivating agent used for passivating the surface of metal zinc, in particular to a preparation method of a trivalent chromium color passivating agent. 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 effect of hexaval...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/53
Inventor 张汝山
Owner TIANJIN DAGANG GALVANIZED FACTORY