A kind of cyanide-free composite plating la-tio on the surface of steel substrate 2 -The electroplating method of the ag layer
A base material surface and composite plating technology, which is applied in the direction of superimposed layer plating, metal material coating process, coating, etc., can solve the problems of slow electrodeposition, insufficient purity of the coating, high hardness, etc., and achieve improved corrosion resistance , The electroplating process is simple, and the surface is even and smooth
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Embodiment 1
[0021] A Cyanide-free Composite La-TiO Plating on the Surface of a Steel Substrate 2 -The electroplating method of Ag layer, comprises the steps:
[0022] (1) Pretreatment of the steel substrate: polishing, degreasing, acidification, and activation steps are carried out in sequence, wherein the polishing is to use a polishing machine to polish the workpiece, the grinding belt speed is 0.5-1m / s, and the abrasive It is one or more mixtures of 200-280 mesh alumina, silicon carbide or zirconia. The degreasing is an alkaline degreasing agent composed of sodium carbonate, sodium phosphate, sodium silicate and emulsifier. The degreasing temperature is 60 o C, acidification is to use 20wt.% mixed acid to remove residual lye and excess oxides on the surface, mixed acid includes hydrofluoric acid and nitric acid, the volume ratio is 0.5:1, and the activation step is to use VHCl:VH 2 SO 4 =1:2 5wt.% mixed acid for activation. The activation process includes auxiliary steps such as stir...
Embodiment 2
[0027] A Cyanide-free Composite La-TiO Plating on the Surface of a Steel Substrate 2 -The electroplating method of Ag layer, comprises the steps:
[0028] (1) Pretreatment of the steel substrate: polishing, degreasing, acidification, and activation steps are carried out in sequence, wherein the polishing is to use a polishing machine to polish the workpiece, the grinding belt speed is 0.5-1m / s, and the abrasive It is one or more mixtures of 200-280 mesh alumina, silicon carbide or zirconia. The degreasing is an alkaline degreasing agent composed of sodium carbonate, sodium phosphate, sodium silicate and emulsifier. The degreasing temperature is 63 o C, acidification is to use 30wt.% mixed acid to remove residual lye and excess oxides on the surface, mixed acid includes hydrofluoric acid and nitric acid, the volume ratio is 0.5:1.3, and the activation step is to use VHCl:VH 2 SO 4 =1:2 composition of 6.5wt.% mixed acid for activation. The activation process includes auxiliary...
Embodiment 3
[0033] A Cyanide-free Composite La-TiO Plating on the Surface of a Steel Substrate 2 -The electroplating method of Ag layer, comprises the steps:
[0034] (1) Pretreatment of the steel base material: polishing, degreasing, acidification, and activation steps are carried out in sequence. The polishing is to use a polishing machine to polish the workpiece, and the speed of the grinding belt is 0.5-1m / s. The abrasive is one or more mixtures of 200-280 mesh alumina, silicon carbide or zirconia. The degreasing agent is an alkaline degreasing agent composed of sodium carbonate, sodium phosphate, sodium silicate and emulsifier. The degreasing temperature 65 o C, acidification is to use 40wt.% mixed acid to remove residual lye and excess oxides on the surface, mixed acid includes hydrofluoric acid and nitric acid, the volume ratio is 0.5:1.5, and the activation step is to use VHCl:VH 2 SO 4 =1:2 8wt.% mixed acid for activation. The activation process includes auxiliary steps such a...
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