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A weakly acidic to neutral zinc-nickel alloy electroplating additive and electroplating solution with high corrosion resistance

An electroplating additive, zinc-nickel alloy technology, applied in the field of metal surface treatment, can solve the problems of affecting the service life of equipment, complex operation process, affecting the nickel content of the coating, etc., to increase the range of current density, high current efficiency, and excellent anti-corrosion performance 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

[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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  • A weakly acidic to neutral zinc-nickel alloy electroplating additive and electroplating solution with high corrosion resistance
  • A weakly acidic to neutral zinc-nickel alloy electroplating additive and electroplating solution with high corrosion resistance
  • A weakly acidic to neutral zinc-nickel alloy electroplating additive and electroplating solution with high corrosion resistance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

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

[0035] Wherein, the composition (mass fraction) of the 23ml / L brightener is: 20% of potassium methylsulfonate, 5% of di-semicarbazide polymer, and water as the balance.

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

Embodiment 2

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

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

[0040] Wherein, the composition (mass fraction) of the 24ml / L brightener is: sodium propargyl sulfonate 29%, di-semicarbazide polymer 4.2%, and water as the balance.

[0041] Among them, the composition (mass fraction) of the 3.5ml / L displacement agent is 5% maleic anhydride, 5.4% dispersant NNO (sodium methylene bis-naphthalene sulfonate), 10% nicotinamide, and water as the balance.

Embodiment 3

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

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

[0045] Wherein, the composition (mass fraction) of the 25ml / L brightener is: sodium allyl sulfonate 18%, di-semicarbazide polymer 2.6%, and water as the balance.

[0046] Among them, the composition (mass fraction) of the 4ml / L walking agent is 8% maleic anhydride, 4% dispersant NNO (sodium methylene bis-naphthalene sulfonate), 13% 2-chloronicotinic acid, 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, in particular to a weakly acidic to neutral zinc-nickel alloy electroplating additive with high corrosion resistance and an electroplating solution. 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 sy...

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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