A cyanide-free composite plating re-tio on the surface of steel substrate 2 - Plating method of ag layer
A re-tio2-ag, substrate surface technology, applied in coatings, electrolytic coatings, etc., can solve the problems of insufficient coating purity, decreased welding performance, and inability to use thick silver plating, and achieve the effect of simple electroplating process
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Embodiment 1
[0019] A kind of cyanide-free composite plating La-TiO on the surface of steel substrate 2 -A method for electroplating an Ag layer, comprising the steps of:
[0020] (1) Carry out pretreatment to steel substrate: carry out polishing successively, degreasing, acidification, activation step, wherein polishing is to adopt polishing machine to carry out polishing treatment to workpiece, and grinding belt speed 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 60°C, acidification is to use 20wt% mixed acid to remove residual lye and excess oxides on the surface, the 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 mixed acid with a mass fraction of 5wt% for activation. The activatio...
Embodiment 2
[0025] A kind of cyanide-free composite plating Pr-TiO on the surface of steel substrate 2 -A method for electroplating an Ag layer, comprising the steps of:
[0026] (1) Carry out pretreatment to steel substrate: carry out polishing successively, degreasing, acidification, activation step, wherein polishing is to adopt polishing machine to carry out polishing treatment to workpiece, and grinding belt speed 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 63°C, acidification is to use 30wt% mixed acid to remove residual lye and excess oxides on the surface, the 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 mixed acid with a mass fraction of 6.5wt% for activation. The activ...
Embodiment 3
[0031] A kind of cyanide-free composite plating Gd-TiO on the surface of steel substrate 2 -A method for electroplating an Ag layer, comprising the steps of:
[0032] (1) Carry out pretreatment to steel substrate: carry out polishing successively, degreasing, acidification, activation step, wherein polishing is to adopt polishing machine to carry out polishing treatment to workpiece, and grinding belt speed 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°C, acidification is to use 40wt% mixed acid to remove residual lye and excess oxides on the surface, the 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 mixed acid with a mass fraction of 8wt% for activation. The activat...
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