Standard for thickness of black nickel coating on bolts

The standard thickness of black nickel plating on bolts is about 0.0 1-0.03mm, and the specific thickness depends on the size of metal wor

Standard for thickness of black nickel coating on bolts

The standard thickness of black nickel plating on bolts is about 0.0 1-0.03mm, and the specific thickness depends on the size of metal workpiece. Black nickel electroplating is often used in some industries with special requirements, such as optical instruments and photographic equipment. Black nickel coating has high absorption rate of solar energy and can be used for solar collector. Black nickel coating can be obtained from NiZn alloy plating solution and NiSn alloy plating solution. There are high nonmetallic phases in NiZn black nickel coating, such as nickel sulfide, zinc sulfide and organic mixture. The formation of sulfide is due to the reduction of thiocyanate on the cathode to release sulfur ions.