초록 ▼

Non-metallic surfaces are prepared to receive an electroless metal deposit of copper, gold or nickel using a two-step adsorption procedure to sensitize the surface. The surface is first immersed in a bath containing copper in solution or suspension to adsorb the copper on the surface, followed by co

Non-metallic surfaces are prepared to receive an electroless metal deposit of copper, gold or nickel using a two-step adsorption procedure to sensitize the surface. The surface is first immersed in a bath containing copper in solution or suspension to adsorb the copper on the surface, followed by contact with a nickel or cobalt bath at a pH above 4 to encourage adsorption of the second metal. The adsorbed metals are then reduced with a borohydride reducing agent, with the nickel or cobalt serving to catalyze the reduction of the copper. The surface can be rinsed between the two adsorption steps without decreasing the effectiveness of the treatment.

대표청구항 ▼

A process of preparing a non-metallic surface for the electroless deposition of a metallic layer of copper, nickel or gold comprising the steps of (a) contacting the surface with a copper compound available from a bath selected from the group consisting of (1) a solution of a simple cupric compound;

A process of preparing a non-metallic surface for the electroless deposition of a metallic layer of copper, nickel or gold comprising the steps of (a) contacting the surface with a copper compound available from a bath selected from the group consisting of (1) a solution of a simple cupric compound; (2) a basic cupric hydrate suspension or colloid prepared by adding an alkali to the solution of (1); (3) a clear cuprate solution; and (4) a complex solution of copper containing a suitable complexing agent; (b) thereafter contacting the surface with an accelerator selected from the group consisting of (1) a nickel salt; and (2) a cobalt salt available as a simple solution, suspension or a complex solution; (c) rinsing the surface; and (d) contacting the surface with a reducing agent selected from the group consisting of a borohydride, hydrazine and a borane.