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High corrosion resistance zinc-nickel alloy electroplating additive with weak acidity to neutrality and electroplating liquid

An electroplating additive, zinc-nickel alloy technology, applied in the field of metal surface treatment, can solve the problems affecting the service life of the equipment, complicated operation process, unstable pH of the plating solution, etc., to increase the current density range, high current efficiency, and corrosion resistance. excellent effect

Active Publication Date: 2015-05-27
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

[0007] Chinese patent application number: CN201110362502.5 Although the composition is relatively simple, it can only be used on the surface of steel substrates, and the pH is low (less than 5, between 3-4), which is highly corrosive to equipment and seriously affects the service life of equipment.
Chinese patent application number: CN201210451680.X Although the pH is high, it is less corrosive to equipment, but its electroplating temperature is 30-40°C, the operating temperature is relatively narrow, and the electroplating process requires pre-plating and re-plating, and the operating process is relatively complex. complex
But the water solubility of boric acid is not good, and hot water above 70°C is needed for dissolving, and it is easy to precipitate when the temperature is low. Will form black spots on the surface of the coating and affect the performance of the coating

Method used

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  • High corrosion resistance zinc-nickel alloy electroplating additive with weak acidity to neutrality and electroplating liquid
  • High corrosion resistance zinc-nickel alloy electroplating additive with weak acidity to neutrality and electroplating liquid
  • High corrosion resistance zinc-nickel alloy electroplating additive with weak acidity to neutrality and electroplating liquid

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Experimental program
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Effect test

Embodiment 1

[0033] The composition of the basic solution is: potassium chloride 150g / L, potassium acetate 35g / L, zinc chloride 54g / L, and nickel chloride 57g / L. Add complexing agent: 62ml / L, brightening agent: 23ml / L, and positioning agent: 3ml / L to the above weak acid to neutral base solution, and stir evenly to obtain zinc-nickel alloy electroplating solution.

[0034] Among them, the 62ml / L complexing agent composition (mass fraction) is 7% of acetylsalicylic acid, 42% of caprolactam, and water as the balance.

[0035] Among them, the 23ml / L brightener composition (mass fraction) is: 20% potassium hydroxymethanesulfonate, 5% diaminocarbazide polymer, and water as the balance.

[0036] Among them, the composition (mass fraction) of 3ml / L positioning agent is maleic anhydride 6%, dispersant NNO (sodium methylene naphthalene sulfonate) 3.5%, niacin 16%, and water as the balance.

Embodiment 2

[0038] The composition of the base solution is: potassium chloride 176g / L, potassium acetate 38g / L, zinc chloride 50g / L, and nickel chloride 67.5g / L. Add complexing agent: 60ml / L, brightening agent: 24ml / L, and positioning agent: 3.5ml / L to the above weak acid to neutral base solution, and stir well to obtain zinc-nickel alloy electroplating solution.

[0039] Among them, the composition (mass fraction) of the 60ml / L complexing agent is 7.5% of acetylsalicylic acid, 35% of β-propiolactam, and water as the balance.

[0040] Among them, the composition (mass fraction) of 24ml / L brightener is 29% sodium propargyl sulfonate, 4.2% diaminourea polymer, and water as the balance.

[0041] Among them, the 3.5ml / L positioner composition (mass fraction) is maleic anhydride 5%, dispersant NNO (sodium methylene naphthalene sulfonate) 5.4%, niacin amine 10%, and water as the balance.

Embodiment 3

[0043] The composition of the base solution is: potassium chloride 168g / L, potassium acetate 43g / L, zinc chloride 58g / L, and nickel chloride 55g / L. Add complexing agent: 82ml / L, brightening agent: 25ml / L, and positioning agent: 4ml / L to the above weak acid to neutral base solution, and stir evenly to obtain zinc-nickel alloy electroplating solution.

[0044] Among them, the composition (mass fraction) of the 82ml / L complexing agent is 5% of acetylsalicylic acid, 30% of imidazole, and water as the balance.

[0045] Among them, the 25ml / L brightener composition (mass fraction) is: sodium allyl sulfonate 18%, diaminocarbazide polymer 2.6%, and water as the balance.

[0046] Among them, the composition of 4ml / L positioning agent (mass fraction) is 8% maleic anhydride, dispersant NNO (sodium methylene naphthalene sulfonate) 4%, 2-chloronicotinic acid 13%, and water as the balance .

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Abstract

The invention discloses a high corrosion resistance zinc-nickel alloy electroplating additive with weak acidity to neutrality and an electroplating liquid. The high corrosion resistance zinc-nickel alloy electroplating additive comprises the following components in parts by volume: 60-90 parts of a complexing agent, 15-25 parts of brightener, and 1-5 parts of a change agent. The electroplating liquid prepared from the additive consists of 150-220g / L of potassium chloride, 35-70g / L of potassium acetate, 50-75g / L of zinc chloride, 55-80g / L of nickel chloride, 60-90ml / L of a complexing agent, 15-25ml / L of a brightener, 1-5ml / L of a change agent and the balance of water. The high corrosion resistance zinc-nickel alloy electroplating additive disclosed by the invention is free of boric acid and ammonium chloride, the current efficiency of the high corrosion resistance zinc-nickel alloy electroplating additive is as high as 95%, as the basic liquid is free of boric acid, the pH value is relatively high and can be stabilized to be 5.5-7, the nickel content of a layer formed by electroplating with the electroplating liquid with the additive is stabilized to be within 10-15%, and the electroplated layer is stable in gamma crystal phase and excellent in anti-corrosion property.

Description

Technical field [0001] The invention relates to the technical field of metal surface treatment, and more specifically to a weakly acidic to neutral zinc-nickel alloy electroplating additive and electroplating solution with high corrosion resistance. Background technique [0002] Electroplated zinc-nickel alloy is a kind of steel anode protective coating that has emerged in the past 20 years. The zinc-nickel alloy coating not only has a corrosion resistance 5-10 times higher than that of the traditional zinc coating, but also has good paintability, weldability and formability, has excellent corrosion resistance and low hydrogen embrittlement, and is suitable for electroplating requiring 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 ...

Claims

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Application Information

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IPC IPC(8): C25D3/56
CPCC25D3/565
Inventor 王婷张红利王池黄丹张迎袁震芹田桂梅李杨李雪芬杨吕毕超群徐秀萍吴霞
Owner 武汉风帆电化科技股份有限公司
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