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Galvanized workpiece surface passivating solution

A technology of workpiece surface and passivation solution, which is applied in the direction of metal material coating process, etc.

Inactive Publication Date: 2015-02-04
无锡永发电镀有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to propose a kind of surface passivation solution of galvanized workpiece, this passivation solution replaces hexavalent chromium with trivalent chromium, overcomes the environmental pollution defect of hexavalent chromium, adopts the passivation film prepared by this passivation solution simultaneously Has good corrosion resistance, and has a certain self-healing ability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A kind of galvanized workpiece surface passivation solution, the composition of this passivation solution is: chromium sulfate 13g / L, sodium hypophosphite 9g / L, sodium fluoride 6g / L, sodium peroxide 7g / L, 70% sulfuric acid 5.5g / L, boric acid 6g / L, acetic acid 2g / L, acrylic resin 12g / L, water-based polyurethane 5g / L, and the balance is water.

Embodiment 2

[0016] A galvanized workpiece surface passivation solution, the passivation solution is composed of: chromium sulfate 17g / L, sodium hypophosphite 7g / L, sodium fluoride 8g / L, sodium peroxide 5g / L, 70% sulfuric acid 7.5g / L, boric acid 4g / L, acetic acid 4g / L, acrylic resin 10g / L, water-based polyurethane 7g / L, and the balance is water.

Embodiment 3

[0018] A galvanized workpiece surface passivation solution, the composition of the passivation solution is: chromium sulfate 15g / L, sodium hypophosphite 8g / L, sodium fluoride 7g / L, sodium peroxide 6g / L, 70% sulfuric acid 6.5g / L, boric acid 5g / L, acetic acid 3g / L, acrylic resin 11g / L, water-based polyurethane 6g / L, and the balance is water.

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PUM

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Abstract

The invention discloses a galvanized workpiece surface passivating solution comprising the following components: 13-17g / L of chromium sulfate, 7-9g / L of sodium hypophosphite, 6-8g / L of sodium fluoride, 5-7g / L of sodium peroxide, 5.5-7.5g / L of 70% sulfuric acid, 4-6g / L of boric acid and, 2-4g / L of acetic acid, 10-12g / L of acrylic resin, 5-7g / L of waterborne polyurethane, and the balance of water.

Description

technical field [0001] The invention relates to the technical field of surface treatment, in particular to a surface passivation solution for galvanized workpieces. Background technique [0002] After the workpiece is galvanized, the zinc layer is exposed in the air. After contacting with oxygen, water vapor and acid gas in the air, it is prone to oxidation reaction, producing oxide or basic zinc salt, so that the original smooth and flat surface of the workpiece is formed. A layer of white powder will seriously affect the appearance, anti-corrosion performance and coating performance of the workpiece. The solution to this problem is to passivate the zinc layer on the surface with a passivating agent after the zinc layer is plated on the workpiece to form a dense passivation film, so that the zinc layer of the workpiece is isolated from air, water vapor, and acid gas to prevent corrosion. corrosion occurs. [0003] The traditional hexavalent chromium passivation process ha...

Claims

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Application Information

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IPC IPC(8): C23C22/36
CPCC23C22/36
Inventor 石明
Owner 无锡永发电镀有限公司
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