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Chromate-free passivation solution and preparation method thereof

A technology of chromium-free passivation and configuration method, which is applied in the direction of metal material coating process, etc., can solve environmental pollution and other problems, and achieve the effect of controlling reaction time

Inactive Publication Date: 2018-10-26
ZHEJIANG KANGSHENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional metal passivation solution uses trivalent chromium to passivate the metal. This passivation solution will cause serious pollution to the environment. With the strict requirements of environmental protection standards in many countries, the electroplating industry is increasingly in need of a Chromium-free passivation solution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A chromium-free passivation solution, including the following substances: 5-35w% water-based functional siloxane oligomer, 1-15ML / L phytic acid, 1-20ML / L phosphoric acid, 1-8g / L zinc ion, and the rest for water.

[0028] The aforementioned chromium-free passivation solution includes the following substances: water-based functional siloxane oligomer 8-32w%, phytic acid 3-13ML / L, phosphoric acid 3-18ML / L, zinc ion 4-6g / L, and the rest is water .

[0029] The aforementioned chromium-free passivation solution includes the following substances: water-based functional siloxane oligomer 10-30w%, phytic acid 5-10ML / L, phosphoric acid 5-15ML / L, zinc ion 3-5g / L, and the rest is water .

[0030] The phytic acid concentration is 0.5-1%.

[0031] The phosphoric acid concentration is 0.5-1.5%.

[0032] A configuration method of the aforementioned chromium-free passivation solution, comprising steps:

[0033] A. Prepare materials, prepare raw materials according to the formula; ...

Embodiment 2

[0047] A chromium-free passivation solution includes the following substances: 8-32w% water-based functional siloxane oligomer, 3-13ML / L phytic acid, 3-18ML / L phosphoric acid, 4-6g / L zinc ion, and the rest are water.

[0048] The phytic acid concentration is 0.5-1%.

[0049] The phosphoric acid concentration is 0.5-1.5%.

[0050] A configuration method of the aforementioned chromium-free passivation solution, comprising steps:

[0051] A. Prepare materials, prepare raw materials according to the formula;

[0052] B. Prepare water, add 1 / 3 of the water required by the formula into the reactor;

[0053] C. add acid, in the reactor, add required phosphoric acid, obtain product c;

[0054] D. Add silicon, in the reaction kettle, add the required water-based functional siloxane oligomer to obtain the product d;

[0055] E. Stir, open the stirring device in the reactor, stir with 2900 rev / min speeds,;

[0056] F. feed, add phytic acid and zinc ion in reactor, obtain product f;...

Embodiment 3

[0064] A chromium-free passivation solution includes the following substances: water-based functional siloxane oligomer 10-30w%, phytic acid 5-10ML / L, phosphoric acid 5-15ML / L, zinc ions 3-5g / L, and the rest are water.

[0065] The phytic acid concentration is 0.5-1%.

[0066] The phosphoric acid concentration is 0.5-1.5%.

[0067] A configuration method of the aforementioned chromium-free passivation solution, comprising steps:

[0068] A. Prepare materials, prepare raw materials according to the formula;

[0069] B. Prepare water, add 1 / 3 of the water required by the formula into the reactor;

[0070] C. add acid, in the reactor, add required phosphoric acid, obtain product c;

[0071] D. Add silicon, in the reaction kettle, add the required water-based functional siloxane oligomer to obtain the product d;

[0072] E. Stir, open the stirring device in the reactor, stir with 2900 rev / min speeds,;

[0073] F. feed, add phytic acid and zinc ion in reactor, obtain product f;...

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PUM

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Abstract

The invention discloses a chromate-free passivation solution which is prepared from the following substances of, by weight, 5 to 35 percent of water-based functional siloxane oligomer, 1 to 15ML / L ofphytic acid, 1 to 20ML / L of phosphoric acid, 1 to 8g / L of zinc ion, and the balance water. The invention further provides a preparation method of the chromate-free passivation solution. The water-based functional siloxane oligomer and the phytic acid jointly form a film forming matter of a passivation film. The phosphoric acid and the zinc ion form an auxiliary forming film. The formula provided by the invention is completely free of chromium elements so as to be environmentally friendly. The chromate-free passivation solution provided by the invention can solve the problem of chromium pollution caused by current chromium passivation, and is the environment-friendly passivation solution free of any heavy metal.

Description

technical field [0001] The invention relates to the field of metal passivation, in particular to a chromium-free passivation solution. Background technique [0002] Steel parts are usually passivated after electro-galvanizing or hot-dip galvanizing to prevent white rust in a short time. [0003] The traditional metal passivation solution uses trivalent chromium to passivate the metal. This passivation solution will cause serious pollution to the environment. With the strict requirements of environmental protection standards in many countries, the electroplating industry is increasingly in need of a Chromium-free passivating solution. Contents of the invention [0004] The object of the present invention is to provide a chromium-free passivation solution. The invention is a chromium-free passivation solution, which not only has a long service life of the passivation solution and is easy to control the passivation process, but also uses the passivation solution to produce ...

Claims

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Application Information

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IPC IPC(8): C23C22/12
CPCC23C22/12
Inventor 滕世政占利华徐军余国华徐新毅王泽方程小爱何柳
Owner ZHEJIANG KANGSHENG CO LTD
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