PROCESS FOR MAKING TIN-LAY ON THE INNERSURFACE OF CUPPER-ALLOY MATERIAL HOLE BUILDER-PANELS

摘要

Production of a tin layer on the inner surface of hollow copper alloy parts comprises reducing the lead content of the inner surface by treating with an aqueous reduction solution based on an acid and then chemically plating the hollow parts with tin. The aqueous reduction solution is hydrogen acid. Preferred Features: The aqueous reduction solution is a non-oxidizing hydrogen acid which is free from chloride and sulfate.