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Novel silane nano trivalent chromium passivation solution and preparation method thereof

A technology of trivalent chromium and passivation solution, which is applied in the coating process of metal materials, etc., can solve the problems of affecting corrosion resistance, poor corrosion resistance, and high surface energy, so as to enhance adhesion and corrosion resistance, and reduce environmental pollution. Harm, the effect of improving corrosion resistance

Inactive Publication Date: 2014-07-02
苏州禾川化学技术服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The complexing agent in the first-generation trivalent chromium passivation solution is mainly fluoride, which has poor corrosion resistance and has been gradually eliminated.
The complexing agent in the second-generation trivalent chromium passivation solution is mainly organic complexes, and other metals are added to greatly improve its corrosion resistance; however, the formed passivation layer has a rough surface and many micropore defects, which affect the passivation The brightness of the layer and its corrosion resistance
However, silica sol may react with trivalent chromium to form insoluble chromium silicate, which may reduce the uniformity of the passivation film and affect its corrosion resistance.
In Zhang Jinsheng's master's thesis "Cr 3+ passivation and process research on electro-galvanized sheet", nano-scale silicon oxide was added to close the gaps in the passivation film, but nano-scale silicon oxide was dispersed in the passivation solution It is a heterogeneous phase, its surface energy is very high, and it is easy to agglomerate, so it cannot form a uniform passivation layer well

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The steps of the preparation method of a silicane nano -nanometer chromium passivation solution, the steps are as follows:

[0038] 1) 3 parts of chromium sulfate, 3 parts of fluoropromic acid, 1.5 sodium fluorinate, 0.3 copies of chloride chloride, KH550 0.5 parts, 0.3 parts of ethylene ethylene ether, 2 parts of nitric acid, hydrochloric acid hydrochloric acid, 0.1 part of the silicon bubbles, 88.3 water;

[0039] 2) Add 3 parts of fluorinic acid to 50 parts of water and stir until fully dissolved;

[0040] 3) Add 1.5 parts of sodium fluorine in step 2 and stir until fully dissolved;

[0041] 4) Add 3 parts of chromium sulfate to stir in step 3 until fully dissolved;

[0042] 5) Add 2 parts of nitric acid and 1 serving of hydrochloric acid in step 4 until dissolved;

[0043] 6) Add 0.3 part of chloride chloride in step 5 until fully dissolved;

[0044] 7) Add 0.5 parts of KH550 to stir in step 6 until fully dissolved;

[0045] 8) Add 0.3 part of the laurel alcohol polyoxy...

Embodiment 2

[0049] The steps of the preparation method of a silicane nano -nanometer chromium passivation solution, the steps are as follows:

[0050] 1) Called 5 chromium chromics, 4 parts of fluorine, 3 parts of ammonium silicate, 0.5 copper chloride chloride, KH560 0.5 parts, nitric acid, 0.5 copies of phosphoric acid, 85.5 water;

[0051] 2) Add 4 parts of fluoribacteric acid to 50 parts of water and stir until fully dissolved;

[0052] 3) Add 3 parts of ammonium silicic acid in step 2 until fully dissolved;

[0053] 4) Add 5 parts of chromium fluoride to stir in step 3 until fully dissolved;

[0054] 5) Add 1 part of nitric acid and 0.5 parts of phosphate until dissolved;

[0055] 6) Add 0.5 parts of chloride chloride to stir in step 5 until fully dissolved;

[0056] 7) Add 0.5 parts of KH560 to stir in step 6 until fully dissolved;

[0057] 8) Add 35.5 parts of water to the step 7 until mixed evenly.

Embodiment 3

[0059] The steps of the preparation method of a silicane nano -nanometer chromium passivation solution, the steps are as follows:

[0060] 1) Called 6 copies of chromium nitrate, 2 parts of fluoric acid, sodium sodium sodium sodium, 0.3 copper chloride chloride, 1 portion of kH550, 3 copies of nitric acid, 1 sulfuric acid, 0.5 polyethylene glycol, water, water, water, water, water, water, water, water, water, water83.2 copies;

[0061] 2) Add 2 parts of fluorosilicic acid to 50 parts of water and stir until fully dissolved;

[0062] 3) Add 3 parts of sodium sodium silicone to stir in step 2 until fully dissolved;

[0063] 4) Add 6 parts of chromium nitrate to stir in step 3 until fully dissolved;

[0064] 5) Add 3 parts of nitric acid and 1 part of sulfuric acid in step 4 until dissolved;

[0065] 6) Add 0.3 part of chloride chloride in step 5 until fully dissolved;

[0066] 7) Add 1 portion of KH550 in step 6 until fully dissolved;

[0067] 8) Add 0.5 parts of polyethylene glycol...

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PUM

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Abstract

The invention relates to a novel silane nano trivalent chromium passivation solution and a preparation method thereof, and especially provides a technology and a preparation process of the passivation solution. The formula of the passivation solution is a complex formulation comprising the following raw materials: 3-10 parts of a trivalent chromium compound, 3-8 parts of a titanium zirconium (zirconium silicon) compound, 0-2 parts of zirconium oxide (hafnium dioxide), 0-3 parts of a silane coupling agent, 0-2 parts of a surface wetting agent, 1-5 parts of inorganic acid, 0-0.5 part of an antifoaming agent and 70-90 parts of water. The nano silane trivalent chromium passivation solution prepared by the preparation process has good stability, can be applied to surface treatment of steel, zinc and aluminum to form a nano oxide conversion coating on the workpiece to be processed, and can greatly enhance the uniformity and compactness of a passivation film, so as to improve corrosion resistance of the passivation film. The additional silane coupling agent can improve the adhesion of the film, and hardness and wear resistance of the passivation film, so as to increase the salt fog time of the passivation film.

Description

Technical field [0001] The present invention involves the prevailing technology in the field of metal surface treatment, which specifically involves a formula and its preparation method for a new type of silate nano -valent chromium puzzle liquid. Background technique [0002] Chromate is the main component of common passivation solution in electroplating and surface treatment.At present, the natalized liquids are generally used. The main problem of the type of passivation solution of this type is that the toxicity of hexavalent chromium is large, which can cause cancer and have a serious impact on the human body and the environment.With the enhancement of people's environmental awareness, the application of hexavalent chromium has gradually been restricted.Because the toxicity of three -valent chromium is only 1%of the hexagonal chromium toxicity, and the trace amount of three -valent chromium is also the essential metal ion for the human body, and the cost of three -valent chro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/48
Inventor 景欣欣
Owner 苏州禾川化学技术服务有限公司
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