| 摘要 |
PURPOSE:To plate economically pure gold on stainless steel by electrolyzing cathodically stainless steel in an acidic electrolysis bath contg. hydrochloric acid and then in the acidic electrolysis bath contg. phosphoric acid and thereafter performing the extremely thin pure gold strike plating and the extremely thin pure gold plating. CONSTITUTION:Stainless steel is cathodically electrolyzed successively in the following acidic electrolysis baths to perform the surface activation, namely the acidic electrolysis bath blending by volume 15-30% 35%-hydrochloric acid, 4-6% 85%-sulfuric acid, 4-6% 68%-nitric acid, 0.5-1.5% 90%-acetic acid and by weight 5-15% citric acid, 0.1-0.3% nonionic or amphoteric surfactant and 0.05-0.15% corrosion inhibitor and the acidic electrolysis bath blending by volume 5-15% 85%-phosphoric acid, 0.5-1.5% 90%-acetic acid, 2-20% pyrrolidone derivative and by weight 5-15% citric acid, 0.1-0.3% nonionic or amphoteric surfactant, 0.5-7% acetylene glycol and 0.05-0.15% corrosion inhibitor. Then the extremely thin pure gold strike plating is performed in 0.005-0.1mum in the acidic plating bath for the stainless steel and furthermore the extremely thin pure gold plating is performed in 0.005-0.5mum.
|
