| 摘要 |
<p>Stainless steel can be directly plated with gold by a process wherein stainless steel is dipped in an activating solution; the activated stainless steel is subjected to cathodic electrolysis in a cathode electrolytic activation solution and then the treated stainless steel is directly plated with gold. A preferable activating solution contains (i) 3 - 20 wt.% of HCI, (ii) 2 - 30 wt.% of H<Sub>2</Sub>SO<Sub>4</Sub>, (iii) 0.1 - 5 wt.% of a nonionic or cationic surfactant and (iv) 0.1 - 20 wt.% of 2-pyrrolidone or N-alkyl-2-pyrrolidone. A preferable cathode electrolytic activation solution contains (i) 5 - 20 wt.% of H<Sub>3</Sub>PO<Sub>4</Sub>, (ii) 2 - 10% HNO<Sub>3</Sub>, (iii) 0.1 - 5 wt.% of a nonionic or cationic surfactant and (iv) 0.1 - 20 wt.% of 2-pyrrolidone or N-alkyl-2-pyrrolidone.</p> |
