Nickel plating solution and electroplating method for automobile trims

Abstract

The invention relates to the technical field of electroplating solutions, in particular to a nickel plating solution and an electroplating method for automobile trims. The nickel plating solution forthe automobile trims comprises the following components: every 1L of the nickel plating solution composition contains the following components of: 200 g to 230 g of nickel nitrate hexahydrate, 20 g to30 g of boric acid, 8 g to 13 g of nanometer titanium dioxide, 0.05 g to 0.09 g of lauryl sodium sulfate, 0.5 g to 1.0 g of saccharin sodium, 5 g to 8 g of yttrium oxide and the balance distilled water; and the pH of the solution is regulated to be 3.0 to 4.5 by using a PH modifier. In an electroplating process, the surface of the titanium dioxide in the electroplating solution takes charges, sothe titanium dioxide can be dispersed on the surface of a substrate in the electroplating process so as to fill pinhole pores of a nickel layer, thus generation of pores is prevented, meanwhile fine grains are strengthened, dislocation motion is resisted, and the strength and the corrosion resistance of a plated layer are improved.

Description

technical field [0001] The invention relates to the technical field of electroplating solutions, in particular to a nickel plating solution for automotive trims and an electroplating method thereof. Background technique [0002] my country's nickel plating industry started relatively late. The nickel plating solution mainly uses a reducing agent to reduce and deposit the nickel ions in the solution on the surface with catalytic activity, and then uses sodium hypophosphite as the reducing agent for electroless plating. Co-deposition, so the nickel plating layer is a nickel-phosphorus alloy coating in which phosphorus is dispersed. After plating, coatings with different phosphorus contents will change in hardness, corrosion resistance, etc. according to the treatment process, and the operation is difficult. [0003] The electroplating solution is mainly composed of nickel salt, conductive salt, pH buffer, and wetting agent. It is electroplated on the cathode by direct current, ...

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Problems solved by technology

[0002] my country's nickel plating industry started relatively late. The nickel plating solution mainly uses a reducing agent to reduce and deposit the nickel ions in the solution on the surface with catalytic activity, and then uses sodium hypophosphite as the reducing agent for electroless plating. Co-deposition, so the nickel plating layer is a nickel-phosphorus alloy coating with phosphorus in a dispersed state. After plating, coatings with different phosphorus contents will change in hardness, corrosion resistance, etc. according to the treatment process, and the operation is difficult.

[0003] The electroplating solution is mainly composed of nickel salt, conductive salt, pH buffer, and wetting agent. It is electroplated on the cathode by direct current, but compared with electroless nickel plating, there are pores in the cathode coating, which causes corrosion. The phenomenon of large cathode and small cathode will be formed, which will accelerate the corrosion rate of the substrate and weaken the protective effect.