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Preparation method of sealed passivation two-in-one treatment agent

A treatment agent and two-in-one technology are applied in the field of preparation of a closed passivation two-in-one treatment agent, which can solve the problems of spontaneous coagulation and precipitation, and difficulty in stripping the closed film, and achieve stable performance, low cost, and appearance. Even color 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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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0007] 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, KH550 The ratio of silane coupling agent 2g / L and deionized water is made, 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

[0009] 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, KH550 The silane coupling agent is 3g / L mixed with deionized 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

[0011] 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, KH550 silane coupling agent 4g / L is mixed with deionized water, the operating temperature is 30℃, 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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Abstract

The invention discloses a preparation method of a sealed passivation two-in-one treatment agent. The formula of the treatment agent comprises chromium sulfate, sodium silicate, cobalt nitrate, sodium nitrate, malonic acid, nickel sulfate, a KH550 silane coupling agent and deionized water. The preparation method has the advantages that the passivation film obtained by the formula is uniform is appearance color and free of colors, and achieves 8-9 level by a neutral salt spray test 96H, and the passivation solution is stable in performance, low in cost price and good in property.

Description

technical field [0001] The invention relates to a preparation method of a passivating agent used for the passivation treatment of metal zinc surfaces, in particular to a preparation method of a closed passivation two-in-one treatment agent. 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 beneficial to prolo...

Claims

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Application Information

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IPC IPC(8): C23C22/53C25D5/48
Inventor 张汝山
Owner TIANJIN DAGANG GALVANIZED FACTORY
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