Black Chrome Plating:
Black chrome is usually plated over bright nickel or matte nickel in the same manner as decorative chrome. Black chrome is not quite as hard or wear resistant as normal nickel/chrome and it is not lustrous. The finish may waxed or oiled to improve the final appearance. Black chrome offers high solar absorption and low emissivity useful in solar panel applications. It is also used for optical components, gun sights and components, lighting and plumbing fixtures and some automotive parts.
Duplex application of Nickel under Chrome is often applied for exterior use. Chrome plating will comply with RoHS – Eurpoean Union requirements in most applications. Abrasion resistance and hardness are characteristics specific to Chrome plating and contribute to its usefulness as a protective decorative finish.