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Preparation method of high-efficiency blue-white passivation and closing passivator

A passivating agent, two-in-one technology, applied in the direction of metal material coating process, can solve the problems of spontaneous coagulation and precipitation, difficulty in stripping the closed film, etc., to achieve stable performance, excellent corrosion resistance, and low cost. 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

How much blue is covered depends on the thickness of the sealing film, the thicker the sealing film is, the more the background color is covered, and the extinction of the coating is more obvious, and some sealing films also have the problem of difficult deplating
Some studies have introduced sodium silicate with a sealing effect into the passivation solution, but experiments have shown that sodium silicate will react with trivalent chromium in the passivation solution to form chromium silicate precipitates, and some people have also studied the addition of sodium silicate to the passivation solution. Silica sol (dispersion system of nano-scale silicon dioxide) is added to the passivation film to close the gap and improve the corrosion resistance, but nano-scale silicon dioxide is easy to spontaneously condense and precipitate in the passivation solution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0007] The formula is: chromium trichloride is 25g / L, sodium silicate is 8g / L, nitric acid is 1ml / L, sodium nitrate is 10g / L, malonic acid is 5g / L, sodium fluoride is 0.8g / L, EDTA is 0.8g / L, KH550 silane coupling agent is 2g / L and deionized water. When used, it is diluted according to the ratio of 10% and water. Operating temperature: room temperature, PH value is controlled at: 2.0 Passivation time For 25 seconds, the surface color of the metal zinc layer is a blue-white and uniform passivation film.

Embodiment 2

[0009] The formula is: chromium trichloride 27.5g / L, sodium silicate 9g / L, nitric acid 1.5ml / L, sodium nitrate 12.5g / L, malonic acid 5-7.5g / L, sodium fluoride It is 1g / L, EDTA is 1g / L, KH550 silane coupling agent is 3g / L and deionized water. It is diluted according to the ratio of 10% and water when used. Operating temperature: room temperature, pH value is controlled at: 2.0. The passivation time is 20 seconds, and the surface color of the metal zinc layer is a blue-white and uniform passivation film.

Embodiment 3

[0011] The formula is: chromium trichloride is 30g / L, sodium silicate is 10g / L, nitric acid is 2ml / L, sodium nitrate is 15g / L, malonic acid is 10g / L, sodium fluoride is 1.2g / L, EDTA is 1.2g / L, KH550 silane coupling agent is 4g / L and deionized water. When used, it is diluted according to the ratio of 15% to water. Operating temperature: room temperature, pH value: 1.8-1.8. The passivation time is 15 seconds, and the surface color of the metal zinc layer is a blue-white and uniform passivation film.

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Abstract

The invention provides a preparation method of a high-efficiency blue-white passivation and closing passivator. The igh-efficiency blue-white passivator is composed of chromium trichloride, sodium silicate, nitric acid, sodium nitrate, malonic acid, sodium fluoride, EDTA (ethylene diamine tetraacetic acid), KH550 silane coupling agent and deionized water. The trivalent chromium passivating film has blue-white color and high uniformity, and the neutral salt fog experiment test 96H indicates that the trivalent chromium passivating film reaches Grade 8-9. 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 passivator used for the passivation treatment of metal zinc surfaces, in particular to a preparation method of a high-efficiency blue-white passivation and sealing two-in-one passivator. Background technique [0002] Electro-galvanizing is the most widely used protective coating, and passivation treatment is usually required to improve its corrosion resistance. The traditional hexavalent chromium passivation process has high toxicity. With the enhancement of environmental protection awareness, more and more The passivation process of many galvanized and zinc alloy products is switching to relatively environmentally friendly trivalent chromium. At present, in order to obtain a galvanized trivalent chromium blue-white passivation film with better corrosion resistance, a sealant is often applied after passivation water washing to improve its resistance to neutral salt spray. Although the sealing agent is...

Claims

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Application Information

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IPC IPC(8): C23C22/34
CPCC23C2222/20
Inventor 张汝山
Owner TIANJIN DAGANG GALVANIZED FACTORY
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