why is gold electroplated over other metals in jewellery
Answers
Answer:
Most often, the base metal for gold plating is copper or copper alloy. When gold is plated on copper, a barrier layer must be plated between copper and gold to prevent copper diffusion in gold and eventual migration on gold surface. ... These anions also help to keep the metals in solution. No free cyanide is in the bath.
Answer:
Most often, the base metal for gold plating is copper or copper alloy. When gold is plated on copper, a barrier layer must be plated between copper and gold to prevent copper diffusion in gold and eventual migration on gold surface. The electrical conductivity would otherwise drop drastically, and the corrosion products of copper would cover the surface. A sulfamate nickel plating is used most often, but for jewelry it should not be used due to the potential allergy hazard of nickel.