Electroplating electrolyte MIRALLOY® 2847

Copper-tin-(zinc) electrolytes as nickel-free alternatives Since 1981, MIRALLOY* has been a good alternative for the nickel free coating of costume jewellery. Particularly endange- red skin zones are the earlobes because of ear-piercing, neck and arms (costume jewellery and wrist watches). MIRALLOY” is an alkaline-cyanide electrolyte for depositing copper-tin or copper-tin-zinc coatings in both barrel and rack operation. Depending on the type of electrolyte used, either white or yellow layers can be deposited. White coatings contain about 55 % copper, 30 % tin and 15 % zinc. Yellow coatings have average alloy percentages of 80 % copper, 17.5 % tin and 2.5% zinc; 80 % copper and 20 % tin, or 85 % copper, 10 % tin and 5 % zinc. MIRALLOY" coatings are characterized by a very good metal dis- tribution and, depending on the type of electrolyte used, high tarnish resistance, levelling, abrasion resistance and excellent corrosion resistance. Subsequent plating with gold, rhodium or other precious metals is unproblematic if suitable processes and pre-tieatment steps are chosen, this will provide optimum corrosion protection.