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A zinc-nickel alloy electroplating additive and electroplating solution with high corrosion resistance gamma crystal phase

An electroplating additive, zinc-nickel alloy technology, applied in the field of metal surface treatment, can solve the problems of uneven nickel content in the coating, accelerate the decomposition of additives, affect performance and other problems, and achieve excellent anti-corrosion performance, good anti-corrosion performance and good thermal shock resistance of the coating Effect

Active Publication Date: 2017-03-22
武汉风帆电化科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Chinese Patent Publication No. CN1746337A discloses an alkaline zincate plating solution. The current efficiency of this plating solution is low, the plating solution is not easy to control, it is easy to be unbalanced, and the nickel content of the coating is uneven, which easily leads to inconsistent product performance.
Patent CN201010501430.3 discloses a zinc-nickel alloy additive for alkaline electroplating. Although it can also prepare a zinc-nickel alloy coating with a nickel content of 12-15%, its plating solution is incompatible with the alkaline galvanizing bath and cannot be directly Realize the conversion from alkaline galvanizing to zinc-nickel alloy, and the red rust time of the neutral salt spray test is only 750h when the coating is about 25
The plating on the coating is slow, the current efficiency is low, the thickness of the coating is too thick, which is not conducive to the subsequent secondary processing, and the thermal shock resistance is also limited.
Moreover, the existing alkaline zinc-nickel alloy additives are not compatible with the alkaline galvanizing system
Carbonates and chlorides produced during the electroplating process of zinc-nickel alloys have poor tolerance. The presence of carbonates and chlorides will accelerate the decomposition of additives, seriously affecting the current efficiency and nickel content of the coating, thereby affecting the overall performance

Method used

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  • A zinc-nickel alloy electroplating additive and electroplating solution with high corrosion resistance gamma crystal phase
  • A zinc-nickel alloy electroplating additive and electroplating solution with high corrosion resistance gamma crystal phase
  • A zinc-nickel alloy electroplating additive and electroplating solution with high corrosion resistance gamma crystal phase

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The composition of the base liquid is ZNO: 7.5g / L, NaOH: 90g / L, 72ml / L of zinc complexing agent, 50ml / L of nickel complexing agent, 30ml / L of nickel additive, and 0.6ml / L of brightener are added to the above In the base liquid, the bath liquid for zinc-nickel alloy electroplating can be obtained after stirring evenly.

[0025] Wherein, the content of each component in the zinc complexing agent of 72ml / L is as follows: 1,10-phenanthroline 11%, antimony potassium tartrate 4%, mercapto compound 28% (dimethyl thioglycolic acid), water is surplus quantity

[0026] Wherein, the content of each component in the nickel complexing agent of 50ml / L is as follows: urotropine 15%, amine compound 29% (dimethylaminopropylamine), benzotriazole 8%, water is surplus .

[0027] Among them, the content of each component in the 30ml / L nickel supplement is as follows: nickel sulfate 40%, triethanolamine 9%, low molecular weight polyethyleneimine 7.5%, and water as the balance.

[0028] Wh...

Embodiment 2

[0030] The composition of the base liquid is ZNO: 7g / L, NaOH: 110g / L, 75ml / L of zinc complexing agent, 36ml / L of nickel complexing agent, 35ml / L of nickel additive, and 0.2ml / L of brightener are added to the above foundation In the solution, that is, the bath solution for zinc-nickel alloy electroplating can be obtained after stirring evenly.

[0031] Wherein, the content of each component in the zinc complexing agent of 75ml / L is as follows: 1,10-phenanthroline 8%, antimony potassium tartrate 2.7%, mercapto compound 23% (3-mercaptopropionic acid), water is surplus quantity

[0032] Wherein, the content of each component in the nickel complexing agent of 36ml / L is as follows: urotropine 12%, amine compound 36% (dimethylethanolamine), benzotriazole 6%, water is surplus.

[0033]Among them, the content of each component in the 35ml / L nickel supplement is as follows: nickel sulfate 36%, triethanolamine 11%, low molecular weight polyethyleneimine 10%, and water as the balance.

...

Embodiment 3

[0036] The composition of the base liquid is ZNO: 11g / L, NaOH: 96g / L, 55ml / L of zinc complexing agent, 45ml / L of nickel complexing agent, 25ml / L of nickel additive, and 0.9ml / L of brightener are added to the above foundation In the solution, that is, the bath solution for zinc-nickel alloy electroplating can be obtained after stirring evenly.

[0037] Wherein, the content of each component in the zinc complexing agent of 55ml / L is as follows: 1,10-phenanthroline 14%, antimony potassium tartrate 2.25%, mercapto compound 22% (mercaptoacetic acid, cysteine), water for the margin

[0038] Wherein, the content of each component in the nickel complexing agent of 45ml / L is as follows: urotropine 10%, amine compound 20% (pentaethylene hexamine, dopamine), benzotriazole 7%, water is surplus quantity.

[0039] Among them, the content of each component in the 25ml / L nickel supplement is as follows: 38% of nickel sulfate, 10% of triethanolamine, 9% of low molecular weight polyethyleneim...

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Abstract

The invention provides a high-corrosion-resistance gamma crystalline phase zinc-nickel alloy electroplating additive and an electroplating liquid. The additive comprises 40-75 parts of a zinc complexing agent, 30-50 parts of a nickel complexing agent, 15-35 parts of a nickel additive and 0.2-2 parts of a brightener; the electroplating liquid comprises 7-12g / L ZnO, 90-130g / L NaOH, a 40-75ml / L zinc complexing agent, a 30-50ml / L nickel complexing agent, a 15-35ml / L nickel additive, a 0.2-2ml / L brightener and the balance being water. The zinc and nickel ions stably exist in the electroplating liquid; the content of nickel in an electroplated coating is within the range of 10-15%; the coating has a stable gamma crystalline phase and has excellent corrosion resistance; besides, the additive system is compatible with an alkaline galvanizing system, so that the direct transformation to a zinc-nickel alloy from alkaline galvanizing can be realized without re-preparing a basic liquid, and the cost is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of metal surface treatment, in particular to a zinc-nickel alloy electroplating additive and electroplating solution with high corrosion resistance gamma crystal phase. Background technique [0002] Zinc-nickel alloy electroplating is a steel anode type protective coating that has emerged in the past 20 years. Zinc-nickel alloy coating not only has 5-10 times higher corrosion resistance than traditional zinc coating, but also has good paintability, weldability and formability, excellent corrosion resistance and low hydrogen embrittlement, suitable for electroplating requirements for fatigue resistance, Such as springs, fasteners and other structural parts or parts used at higher temperatures, so they are widely used in automobiles, aerospace, light industry, home appliances and other industries. [0003] Like traditional electroplating, zinc-nickel alloys are also divided into acidic and alkaline systems. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D3/56
CPCC25D3/565
Inventor 王婷王茂堂王池
Owner 武汉风帆电化科技股份有限公司
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