Poc-r, N thread through (all copper plated nickel)
Detailed
Copper nickel plating is nickel plating on a copper substrate.Nickel plating can be divided into electroplating nickel and electroless nickel plating.After the copper nickel plating can prevent the migration of copper atoms, if the direct chromium plating on the copper substrate, copper atoms will migrate the chromium coating, resulting in copper coating.Inactivity of nickel can protect copper from oxidation.After the plating work in the atmosphere and alkali solution chemical stability, not easy to change color, more than 600 degrees Celsius before oxidation.High hardness, easy to polish, the disadvantage is porous.In a lot of products (especially iron and steel), in the substrate to plating a layer of nickel, the purpose is not only to facilitate subsequent plating of other metals, there are relatively strong adhesion and wear resistance.