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Regeneration method of chemical plating NiWP solution

An electroless plating and solution technology, applied in the field of surface electroless plating, can solve the problems of high cost, inappropriate regeneration, high price of tungsten, etc., and achieve the effect of improving service life, easy removal, and reducing production cost

Inactive Publication Date: 2017-05-10
上海丰豫新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the solubility of calcium tungstate is equivalent to that of calcium phosphite, which is about 0.002g / 100g of water, so the addition of calcium ion compounds will also precipitate calcium tungstate together. Tungsten is expensive, so it will inevitably lead to cost A substantial increase; other methods, the price itself is high, coupled with the interference of tungstate, so it is very inappropriate to be used for the regeneration of electroless NiWP plating solution
Therefore, there is no patent information and papers on the regeneration of electroless NiWP plating solution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A kind of regeneration method of chemical plating NiWP solution, comprises the following steps:

[0025] (1) Preparation process: Weigh 55 g of sodium tungstate, 75 g of sodium citrate, 15 g of sodium hypophosphite, 15 g of boric acid, 2 g of dimethylammonium borane, add 5 L of pure water, and heat the solution while stirring. The heating temperature is 50 ℃, then add 15g of nickel sulfate and stir to dissolve, then add sodium hydroxide to adjust the pH until the pH is adjusted to 7.0±0.2, add 3L of water to constant volume, then carry out electroless NiWP plating, when the quality of the plated layer reaches 40± 2g, proceed to the next step;

[0026] (2) Electrolysis process: use stainless steel as the positive electrode, iron plate as the negative electrode, and control the current density at 2A / dm during electrolysis 2 , the electrolysis time is controlled at 8h, and the electricity passing through each liter of the electroplating solution is 40Ah, until the color o...

Embodiment 2

[0029] A kind of regeneration method of chemical plating NiWP solution, comprises the following steps:

[0030] (1) Preparation process: Weigh 55-65 g of sodium tungstate, 75-85 g of sodium citrate, 15-25 g of sodium hypophosphite, 15-25 g of boric acid, 2-7 g of dimethyl ammonium borane, and add 5-7 L of pure Water, heat the solution while stirring, the heating temperature is 50-55°C, then add 15-25g of nickel sulfate and stir to dissolve, then add sodium hydroxide to adjust the pH until the pH is adjusted to 7.0±0.2, add 3-5L of water Constant volume, followed by electroless NiWP plating, when the quality of the plated coating reaches 40±2g, proceed to the next step;

[0031] (2) Electrolysis process: use stainless steel as the positive electrode, iron plate as the negative electrode, and control the current density at 2-5A / dm during electrolysis 2 , the electrolysis time is controlled at 8-12h, and the electricity passing through each liter of electroplating solution is 40...

Embodiment 3

[0040] A kind of regeneration method of chemical plating NiWP solution, comprises the following steps:

[0041] (1) Preparation process: Weigh 55-65 g of sodium tungstate, 75-85 g of sodium citrate, 15-25 g of sodium hypophosphite, 15-25 g of boric acid, 2-7 g of dimethyl ammonium borane, and add 5-7 L of pure Water, heat the solution while stirring, the heating temperature is 50-55°C, then add 15-25g of nickel sulfate and stir to dissolve, then add sodium hydroxide to adjust the pH until the pH is adjusted to 7.0±0.2, add 3-5L of water Constant volume, followed by electroless NiWP plating, when the quality of the plated coating reaches 40±2g, proceed to the next step;

[0042] (2) Electrolysis process: use stainless steel as the positive electrode, iron plate as the negative electrode, and control the current density at 2-5A / dm during electrolysis 2 , the electrolysis time is controlled at 8-12h, and the electricity passing through each liter of electroplating solution is 40...

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PUM

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Abstract

The invention discloses a regeneration method of a chemical plating NiWP solution. The regeneration method comprises the following steps: (1) a preparation process; (2) an electrolysis process; (3) a cooling and crystallization process. According to the regeneration method, hypophosphite ions in the chemical plating NiWP plating solution are oxidized into phosphate ions through an electrolysis method, and the solubility of sodium phosphate is smaller than that of sodium hypophosphite and thus sodium phosphate is easier to remove; meanwhile, heavy metal ions, such as Pb<2+> (which is commonly used as a stabilizer in the chemical plating solution), in the plating solution are removed through electrolytic deposition, so that the aim of purifying the plating solution is realized; phosphate, sulfate and sodium ions are removed through freezing and wastes are changed into valuable things; the utilization period of the chemical plating NiWP solution is prolonged and the production cost is reduced.

Description

technical field [0001] The invention relates to the field of surface chemical plating, in particular to a method for regenerating a chemical plating NiWP solution. Background technique [0002] The electroless NiWP coating has more excellent corrosion resistance and wear resistance. In the past 10 years, nearly 20 patent technologies of electroless NiWP plating have been disclosed in China, but the service life is not long, and the electroless plating solution cannot be regenerated, which limits application of its technology. [0003] The composition of the electroless NiWP plating solution is as follows: 1. Nickel sulfate and sodium tungstate provide nickel and tungsten elements respectively; 2. The reducing agent is sodium hypophosphite, which provides phosphorus element at the same time; Add sodium gluconate, sodium lactate and other auxiliary complexing agents; 4. Stabilizers and accelerators are selected from thiourea, fluoride ion, potassium iodate, etc.; 5. Ammonia o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/50
CPCC23C18/50C23C18/1617
Inventor 苏长伟黄继杰刘家炎
Owner 上海丰豫新材料科技有限公司
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