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Zinc-nickel alloy trivalent chromium black passivator and preparation process thereof

A zinc-nickel alloy and a preparation process technology, applied in the field of electrochemical deposition, can solve problems such as increasing production costs, environmental pollution, white rust, etc., and achieve the effects of increasing stability, good corrosion resistance, and good wear resistance

Inactive Publication Date: 2019-01-25
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

[0002] Zinc-nickel alloy itself has high corrosion resistance. However, since the main component of zinc-nickel alloy is zinc, if it is not passivated, it is prone to corrosion in harsh environments, thus forming zinc oxide or zinc hydroxide white rust, which affects Protective and decorative functions of zinc-nickel alloys
[0003] Therefore, passivation treatment is usually carried out on the surface of zinc-nickel alloy. After passivation treatment, the appearance and anti-corrosion ability of the zinc-nickel alloy coating can be improved and improved. At present, the common black passivation process uses hexavalent chromium as Passivator, its salt spray ability and passivation appearance are superior, but hexavalent chromium is a highly toxic substance, if it is discharged without treatment, it will cause serious pollution to the environment, if it is treated, it will increase Therefore, the passivation solution of trivalent chromium has gradually become the main demand of the market. However, the corrosion resistance and appearance of the trivalent chromium passivation layer are not as good as those of hexavalent chromium, and the stability of the trivalent chromium passivation agent is poor. , the solution produces precipitation, and the appearance of the resulting passivation layer is not full enough

Method used

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  • Zinc-nickel alloy trivalent chromium black passivator and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Weigh 8g of chromium hydroxide, 0.5g of polyethylene oxide and 50ml of water, mix, heat to 90°C, keep stirring for 0.5h, after the heat preservation is completed, let it stand and cool down to 20°C to obtain a trivalent chromium compound solution, and weigh 0.5g of lemon Disodium hydrogen citrate and 21ml of water were mixed and stirred until the sodium hydroxide was completely dissolved to obtain a disodium hydrogen citrate solution. The disodium hydrogen citrate solution was added dropwise to the trivalent chromium compound solution and stirred. After the addition was completed, Supplement 20ml of water to get A agent;

[0040] Weigh 0.5g of glycerol ether, 10g of glacial acetic acid and 86.5ml of water, mix and dissolve to obtain Agent B;

[0041] Control the temperature of 10ml of agent A, 5ml of agent B and 1000ml of water prepared in this example at 30°C, mix and stir for 5 minutes, let stand for 2 hours, adjust the pH to 2, and passivate the zinc-nickel alloy. Th...

Embodiment 2

[0043] Weigh 9g of chromium chloride, 1g of polyethylene oxide and 40ml of water, mix them, heat to 95°C, heat and stir for 45min, after the heat preservation is completed, let stand and cool down to 25°C to obtain a trivalent chromium compound solution, weigh 1g of hydrogen citrate Sodium and 25ml of water, mixed and stirred, stirred until the sodium hydroxide was completely dissolved to obtain a disodium hydrogen citrate solution, and the disodium hydrogen citrate solution was added dropwise to the trivalent chromium compound solution and stirred, after the addition was completed, 24ml of water to obtain agent A;

[0044] Weigh 1g of glycerol ether, 12g of glacial acetic acid and 87ml of water, mix and stir to dissolve to obtain agent B;

[0045] Control the temperature of 15ml of agent A, 7ml of agent B and 1000ml of water prepared in this example at 35°C, mix and stir for 10 minutes, let it stand for 3 hours, adjust the pH to 2, and passivate the zinc-nickel alloy. The pas...

Embodiment 3

[0047] Weigh 10g of chromium sulfate, 1.5g of polyethylene oxide and 40ml of water, mix them, heat to 100°C, heat and stir for 1h, after the heat preservation is completed, let stand and cool down to 30°C to obtain a trivalent chromium compound solution, weigh 2g of hydrogen citrate Sodium and 26.5ml of water, mix and stir until the sodium hydroxide is completely dissolved to obtain a disodium hydrogen citrate solution, add the disodium hydrogen citrate solution dropwise to the trivalent chromium compound solution and stir, after the addition is complete, add 20ml of water to obtain agent A;

[0048] Weigh 2g of glycerol ether, 14g of glacial acetic acid and 84ml of water, mix and stir to dissolve to obtain agent B;

[0049] Control the temperature of 20ml of agent A, 10ml of agent B and 1000ml of water prepared in this example at 40°C, mix and stir for 5 minutes, let it stand for 2 hours, adjust the pH to 2, and passivate the zinc-nickel alloy. The passivation time is 35 seco...

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Abstract

The invention provides a zinc-nickel alloy trivalent chromium black passivator and a preparation process thereof. The passivator comprises an agent A, an agent B and water, wherein the agent A comprises a trivalent chromium compound, polyoxyethylene, disodium hydrogen citrate and water, and the agent B comprises glyceryl ether, glacial acetic acid and water; the trivalent chromium compound, polyoxyethylene and water are mixed to obtain a trivalent chromium compound solution, and a disodium hydrogen citrate solution is dropwise added to the trivalent chromium compound solution to obtain the agent A; the glyceryl ether, glacial acetic acid and water are mixed to obtain the agent B; the agent A and the agent B are mixed to obtain the zinc-nickel alloy trivalent chromium black passivator. Theblack passivator is more excellent in stability, a generated passivation layer is better in appearance and full in color, and the corrosion resistance is improved to a certain extent.

Description

technical field [0001] The invention relates to the technical field of electrochemical deposition, in particular to a zinc-nickel alloy trivalent chromium black passivator and a preparation process thereof. Background technique [0002] Zinc-nickel alloy itself has high corrosion resistance. However, since the main component of zinc-nickel alloy is zinc, if it is not passivated, it is prone to corrosion in harsh environments, thus forming zinc oxide or zinc hydroxide white rust, which affects The protective and decorative functions of zinc-nickel alloys. [0003] Therefore, passivation treatment is usually carried out on the surface of zinc-nickel alloy. After passivation treatment, the appearance and anti-corrosion ability of the zinc-nickel alloy coating can be improved and improved. At present, the common black passivation process uses hexavalent chromium as Passivator, its salt spray ability and passivation appearance are superior, but hexavalent chromium is a highly to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/53
CPCC23C22/53C23C2222/10
Inventor 张红利凡宝安王池李雪芬罗江张帅袁震芹
Owner 武汉风帆电化科技股份有限公司
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