FOERFARANDE FOER FOERBEHANDLING AV KARBOXYLAMIDGRUPPHALTIGA TERMOPLASTISKA PLASTER FOER FRAMSTAELLNAV FAESTANDE METALLBELAEGGNINGAR

摘要

The pretreating of thermoplastic substrates containing carbonamide groups and an inorganic, fine-particulate adhesion filler, is improved to produce strongly adhering metal coatings thereon, by combining the following steps: the pickling is divided in at least two partial steps, where the first partial step comprises predipping in a pickling solution such as 50 to 96% sulfuric acid where the surface tension is lowered to at most 25 mN/m at 20 DEG C., and the pretreated plastic is dried at 70 DEG to 110 DEG C. before the actual galvanic metal deposition.