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High corrosion resistance trivalent chromium blue and white passivating liquid as well as preparation method and application of blue and white passivating liquid

A technology of trivalent chromium and high corrosion resistance, applied in the direction of metal material coating process, etc., can solve the problems of low corrosion resistance and thin thickness of the passivation film, and achieve the production cost reduction, simple preparation method and stable performance. Effect

Active Publication Date: 2013-04-17
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] One of the purposes of the present invention is to provide a high corrosion resistance trivalent chromium blue-white passivation solution in order to solve the above-mentioned technical problem that the corrosion resistance of the passivation film is not high and the thickness is relatively thin

Method used

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  • High corrosion resistance trivalent chromium blue and white passivating liquid as well as preparation method and application of blue and white passivating liquid
  • High corrosion resistance trivalent chromium blue and white passivating liquid as well as preparation method and application of blue and white passivating liquid
  • High corrosion resistance trivalent chromium blue and white passivating liquid as well as preparation method and application of blue and white passivating liquid

Examples

Experimental program
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Effect test

Embodiment 1

[0030] A high corrosion resistance trivalent chromium blue-white passivation solution, calculated per liter, its components and contents are as follows:

[0031] Chromium sulfate 10g

[0032] Sodium Fluoride 5g

[0033] Sodium hypophosphite 2g

[0034] Citric acid 0.3g

[0035] Sodium nitrate 2g

[0036] Cobalt Sulfate Heptahydrate 5g

[0037] The balance is deionized water.

[0038] The preparation method of above-mentioned high corrosion resistance trivalent chromium blue-white passivation solution, the steps are as follows:

[0039] Weigh chromium sulfate and dissolve it in deionized water, then add citric acid, add sodium hypophosphite and sodium nitrate after stirring and dissolving, stir again to completely dissolve, then add cobalt sulfate heptahydrate to dissolve, and finally add sodium fluoride and continue stirring for 2 hours to make All raw materials are mixed evenly to obtain trivalent chr...

Embodiment 2

[0050] A high corrosion resistance trivalent chromium blue-white passivation solution, calculated per liter, its components and contents are as follows:

[0051] Chromium sulfate 10g

[0052] Sodium Fluoride 4g

[0053] Sodium hypophosphite 3g

[0054] Citric acid 1g

[0055] Sodium nitrate 3g

[0056] Cobalt Sulfate Heptahydrate 10g

[0057] The balance is deionized water.

[0058] The preparation method of above-mentioned high corrosion resistance trivalent chromium blue-white passivation solution, the steps are as follows:

[0059] Weigh chromium sulfate and dissolve it in deionized water, then add citric acid, stir to dissolve, add sodium hypophosphite and sodium nitrate, stir again to dissolve completely, then add cobalt sulfate heptahydrate to dissolve, and finally add and continue stirring for 2 hours to mix the raw materials Uniform, finally get high corrosion resistance trivalent chromium blue-...

Embodiment 3

[0061] A high corrosion resistance trivalent chromium blue-white passivation solution, calculated per liter, its components and contents are as follows:

[0062] Chromium sulfate 25g

[0063] Sodium fluoride 8g

[0064] Sodium hypophosphite 5g

[0065] Citric acid 1.5g

[0066] Sodium nitrate 5g

[0067] Cobalt Sulfate Heptahydrate 10g

[0068] The balance is deionized water.

[0069] The preparation method of above-mentioned high corrosion resistance trivalent chromium blue-white passivation solution, the steps are as follows:

[0070] Weigh chromium sulfate and dissolve it in deionized water, then add citric acid, add sodium hypophosphite and sodium nitrate after stirring and dissolving, stir again to completely dissolve, then add cobalt sulfate heptahydrate to dissolve, and finally add sodium fluoride and continue stirring for 2 hours to make All raw materials are mixed evenly, and finally a high-corrosion-resistant trivalent chromium blue-white passivation solution i...

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Abstract

The invention discloses high corrosion resistance trivalent chromium blue and white passivating liquid and a preparation method of the blue and white passivating liquid. Calculated by each litre, the high corrosion resistance trivalent chromium blue and white passivating liquid consists of 5-25g of chromium sulfate, 2-8g of sodium fluoride, 1-6g of sodium hypophosphite, 0.3-1.5g of citric acid, 1-5g of sodium nitrate, 5-15g of cobaltous sulfate heptahydrate and the balance of deionized water. The preparation method comprises the following steps of: dissolving the chromium sulfate into the deionized water; adding citric acid to stir and dissolve; adding the sodium hypophosphite and the sodium nitrate to stir again until the solutions are completely dissolved; adding the cobaltous sulfate heptahydrate into the solutions to be dissolved; and finally adding the sodium fluoride to continuously stir to uniformly mix the raw materials to obtain the high corrosion resistance trivalent chromium blue and white passivating liquid which is stable in performance, long in service life, low in production cost and environment-friendly, and avoids toxicity. The preparation method for the trivalent chromium blue and white passivating liquid is simple, easy to operate, and suitable for industrial production.

Description

technical field [0001] The invention relates to a metal passivation solution, more specifically to a high-corrosion-resistant trivalent chromium blue-white passivation solution used for surface passivation of steel after galvanizing, and a preparation method and application thereof. Background technique [0002] Galvanized layer is widely used as an anodic protective layer for the protection of steel surfaces. In the atmosphere with humidity higher than 70%, the surface of metal zinc is easy to corrode, and the product is white rust. In order to slow down the generation of white rust, a layer of chromate film with high chemical stability is usually formed on the surface of galvanized layer to improve its corrosion resistance. This film is called passivation film or conversion film. [0003] The most commonly used passivation process for galvanized layer passivation is chromate passivation, because the passivation film formed has good shielding performance and self-repairin...

Claims

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Application Information

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IPC IPC(8): C23C22/36
Inventor 韩生缪树婷曹磊昌王金钻王建华夏乃洁何忠义熊丽萍郁平孙揭阳高峰朱贤王爱民
Owner SHANGHAI INST OF TECH
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