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Blue passivator for steel parts and preparation method thereof

A passivation agent, blue technology, applied in the direction of metal material coating process, etc., can solve the problems of corrosion resistance, inability to meet industrialization requirements, weak corrosion resistance of passivation layer, etc., to achieve the effect of improving corrosion resistance

Inactive Publication Date: 2021-04-30
安徽鼎旺环保材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are many types of chromium-free passivation processes, and the processes are not mature enough to meet the requirements of industrialization.
The trivalent chromium compound can also form a passivation film under acidic conditions, and the passivation of the trivalent chromium compound has been popularized, but the anti-corrosion ability of the trivalent chromium compound passivation layer is still weak compared with the traditional hexavalent chromium passivation layer Not a lot, this is because the passivation film thickness of the traditional trivalent chromium blue passivator is only about 80nm, and the corrosion resistance of its products is affected

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  • Blue passivator for steel parts and preparation method thereof
  • Blue passivator for steel parts and preparation method thereof

Examples

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Effect test

Embodiment 1

[0013] Embodiment 1, be used for the blue passivating agent of iron and steel parts, comprise following weight parts (kg) raw material: chromium sulfate 150, nano silica sol 80, malonic acid 20, sodium hydroxide 70, cobalt sulfate 100, citric acid 40 , sodium nitrate 10, nitric acid 20, sulfuric acid 30, sodium fluoride 10 and appropriate amount of deionized water.

[0014] The preparation method of the blue passivating agent that is used for iron and steel parts, comprises the following steps:

[0015] Ⅰ Mix chromium sulfate, citric acid, malonic acid, nitric acid, sulfuric acid and deionized water, heat to 75°C, keep it warm for 3 hours, then let it stand and cool to 20°C;

[0016] Ⅱ Add sodium hydroxide, sodium nitrate, sodium fluoride, stir and mix well;

[0017] Ⅲ Adjust the temperature of the mixed solution to 25°C, add cobalt sulfate and nano-silica sol, stir for 8 minutes, and let stand for 2 hours.

Embodiment 2

[0018] Embodiment 2, be used for the blue passivating agent of iron and steel parts, comprise following weight parts (kg) raw material: chromium sulfate 185, nano silica sol 100, malonic acid 25, sodium hydroxide 75, cobalt sulfate 110, citric acid 45 , 15% sodium nitrate, 25% nitric acid, 35% sulfuric acid, 15% sodium fluoride and an appropriate amount of deionized water.

[0019] The preparation method of the blue passivating agent that is used for iron and steel parts, comprises the following steps:

[0020] Ⅰ Mix chromium sulfate, citric acid, malonic acid, nitric acid, sulfuric acid and deionized water, heat to 80°C, keep warm for 3.5h, then let stand and cool to 25°C;

[0021] Ⅱ Add sodium hydroxide, sodium nitrate, sodium fluoride, stir and mix well;

[0022] Ⅲ Adjust the temperature of the mixed solution to 30°C, add cobalt sulfate and nano-silica sol, stir for 10 minutes, and let stand for 2.5 hours.

Embodiment 3

[0023] Embodiment 3, be used for the blue passivating agent of iron and steel parts, comprise following weight parts (kg) raw material: chromium sulfate 220, nano silica sol 120, malonic acid 30, sodium hydroxide 80, cobalt sulfate 120, citric acid 50 , sodium nitrate 20, nitric acid 30, sulfuric acid 40, sodium fluoride 20 and appropriate amount of deionized water.

[0024] The preparation method of the blue passivating agent that is used for iron and steel parts, comprises the following steps:

[0025] Ⅰ Mix chromium sulfate, citric acid, malonic acid, nitric acid, sulfuric acid and deionized water, heat to 85°C, keep it warm for 4 hours, then let it stand and cool to 30°C;

[0026] Ⅱ Add sodium hydroxide, sodium nitrate, sodium fluoride, stir and mix well;

[0027] Ⅲ Adjust the temperature of the mixed solution to 35°C, add cobalt sulfate and nano-silica sol, stir for 12 minutes, and let stand for 3 hours.

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Abstract

The invention discloses a blue passivator for steel parts and a preparation method thereof. The blue passivator comprises the following raw materials in parts by weight: 150 to 220 parts of chromium sulfate, 80 to 120 parts of nano silica sol, 20 to 30 parts of malonic acid, 70 to 80 parts of sodium hydroxide, 100 to 120 parts of cobalt sulfate, 40 to 50 parts of citric acid, 10 to 20 parts of sodium nitrate, 20 to 30 parts of nitric acid, 30 to 40 parts of sulfuric acid, 10 to 20 parts of sodium fluoride and a proper amount of deionized water. According to the blue passivator for the steel parts provided by the invention, after the nanoscale silica sol is added, micropores of a passivating film layer can be filled with the nanoscale silica sol, so that a prepared film layer is thick, pores of the passivating film are sealed, and the corrosion resistance of the passivating film is greatly improved.

Description

technical field [0001] The invention relates to the technical field of blue passivating agent, in particular to a blue passivating agent used for iron and steel parts and a preparation method thereof. Background technique [0002] The purpose of electro-galvanizing is to prevent steel objects from being corroded, improve the corrosion resistance and service life of steel, and also increase the decorative appearance of the product. Steel will be weathered and corroded by water or soil over time. The steel that is corroded every year in China accounts for almost one-tenth of the total amount of steel. Therefore, in order to protect the service life of steel or its parts, electrogalvanizing is generally used to process steel. Since zinc is more conductive than steel, it provides excellent protection and acts as a corrosion medium. However, there is a huge potential difference between the steel and the coating, which makes the dissolution rate of the coating high. However, zin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/50C23C22/82
CPCC23C22/50C23C22/82
Inventor 范文俊
Owner 安徽鼎旺环保材料科技有限公司
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