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Zinc-nickel alloy blue passivation agent and its preparation process

A technology of zinc-nickel alloy and passivation agent, applied in the direction of metal material coating process, etc., can solve the problems of various types of chromium-free passivation process, unable to meet industrialization requirements, weak anti-corrosion ability, etc., to achieve good chemical polishing effect, Conducive to the point deposition of chromium and the effect of low bath resistance

Active Publication Date: 2021-01-01
武汉风帆电化科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 Many, the corrosion resistance of its products is affected
At the same time, strong acidic passivation solution is generally used in the market, and this kind of passivation solution causes serious loss of coating.

Method used

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  • Zinc-nickel alloy blue passivation agent and its preparation process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Weigh 150g of chromium chloride, 40g of citric acid, 10g of oxalic acid, 10g of trisodium phosphate and 400ml of water, mix them, heat to 70°C, heat and stir for 2 hours, after the heat preservation is completed, let stand and cool down to 20°C to obtain a trivalent chromium compound solution. Weigh 70g of sodium hydroxide, 20g of ammonium sulfate and 200ml of water, mix and stir until the sodium hydroxide and ammonium sulfate are completely dissolved, let stand and cool to 20°C to obtain a mixed solution, and add the mixed solution dropwise to the trivalent chromium compound solution Add 10ml of water to obtain Agent A after the dropwise addition is completed;

[0041] Weigh 70g of cobalt nitrate, 50g of nickel sulfate, 10g of sodium nitrate, 10g of citric acid and 860ml of water, mix and dissolve to obtain Agent B;

[0042] Heat 20ml of Agent A, 40ml of Agent B and 940ml of water prepared in this example to 25°C, mix and stir for 5 minutes, let stand for 2 hours, adju...

Embodiment 2

[0044] Weigh 210g of chromium hydroxide, 45g of citric acid, 30g of oxalic acid, 20g of trisodium phosphate and 300ml of water, mix them, heat to 80°C, heat and stir for 3 hours, after the heat preservation is completed, let stand and cool down to 25°C to obtain a trivalent chromium compound solution, Weigh 80g of sodium hydroxide, 25g of ammonium chloride and 200ml of water, mix and stir until the sodium hydroxide and ammonium chloride are completely dissolved, let stand and cool to 25°C to obtain a mixed solution, and add the mixed solution dropwise to trivalent chromium Compound solution and stirred, after the dropwise addition, add 90ml of water to obtain agent A;

[0045] Weigh 100g of cobalt sulfate, 100g of nickel chloride, 15g of sodium chloride, 15g of tartaric acid and 770ml of water, mix and dissolve to obtain B agent;

[0046] Heat 25ml of agent A, 50ml of agent B and 925ml of water prepared in this example to 30°C, mix and stir for 10 minutes, let stand for 2 hour...

Embodiment 3

[0048] Weigh 270g of chromium sulfate, 60g of citric acid, 40g of oxalic acid, 30g of trisodium phosphate and 200ml of water, mix them, heat to 90°C, keep stirring for 4 hours, after the heat preservation is completed, let stand and cool down to 30°C to obtain a trivalent chromium compound solution, weigh Take 90g of sodium hydroxide, 10g of ammonium chloride, 20g of ammonium oxalate and 200ml of water, mix and stir until the sodium hydroxide is completely dissolved, let stand and cool to 30°C to obtain a mixed solution, and add the mixed solution dropwise to the trivalent chromium compound solution and stirred, after the dropwise addition, add 140ml of water to obtain agent A;

[0049] Weigh 100g of cobalt nitrate, 30g of cobalt sulfate, 100g of nickel sulfate, 50g of nickel chloride, 20g of sodium molybdate, 15g of citric acid, 5g of tartaric acid and 680ml of water, mix and dissolve to obtain agent B;

[0050] Heat 30ml of Agent A, 60ml of Agent B and 910ml of water prepare...

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Abstract

The invention discloses a zinc-nickel alloy blue passivator and a preparation method thereof. The passivator comprises an agent A and an agent B, wherein the agent A comprises a trivalent chromium compound, oxalic acid, citric acid, trisodium phosphate, sodium hydroxide, a complexing agent and deionized water; the agent B comprises cobalt salt, nickel salt, sodium salt, a stabilizer and deionizedwater. The preparation method of the zinc-nickel alloy blue passivator comprises the following steps: mixing the trivalent chromium compound, oxalic acid, citric acid and trisodium phosphate with water, heating and preserving heat to obtain a trivalent chromium compound solution, dropwise adding a sodium hydroxide solution into the trivalent chromium compound solution to obtain the agent A, mixingcobalt salt, nickel salt, sodium salt and the stabilizer with water to obtain the agent B, and mixing the agent A and the agent B with water to obtain the zinc-nickel alloy blue passivator. The bluepassivator is capable of reducing loss of coating; the service life of the passivator is longer; meanwhile, the passivated appearance is better; the corrosion resistance of the coating is greatly improved.

Description

technical field [0001] The invention relates to the technical field of metal surface treatment and protection, in particular to a zinc-nickel alloy blue passivator and a preparation process thereof. Background technique [0002] The early chromate passivation film mainly uses hexavalent chromium as the main salt, and the formed film has excellent performance and the stability of the passivation solution is good. However, due to the hazards of hexavalent chromium, research on chromium-free passivation has been carried out. 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 hexavale...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/47
CPCC23C22/47C23C2222/10
Inventor 张红利罗江李锋清王池李雪芬李杨凡宝安
Owner 武汉风帆电化科技股份有限公司
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