FLUORIDE-CHLORIDE ELECTOLYTE FOR TIN-COBALT COATING DEPOSITION

摘要

Tin-cobalt coatings may replace silver coatings in strong current equipment, such as switches, cable shoes, radio locator antennas, etc. They have an enhanced rigidity, resistance to wear and corrosion. The electrolyte contains (in g/l) : tin chloride (from 25 to 40); cobalt chloride (5 - 15); ammonium fluoride (20 - 30); ammonium chloride (30 - 50); ammonium citrate (30 - 50); nonylphenolpolyglycolether with 20 etoxygroups (3 - 5); sulphosalicylic acid (1 - 3); and dextrin (0.5 - 2).