PREPARATION OF BLACK STAINLESS STEEL BY NORMAL PLUSE VOLTAMMETRY METHOD

A normal pluse voltammetry method to obtain black film on stainless steel in Cr-free boracic acid solution was developed.The working temperature was lowered by using a special additive.The corrosion behavior of anodic oxide film on stainless steel in 3.5% NaCl solution was evalueted by potentiodynamic polarization and scan probe microscopy(SPM).The new technology can replace other chemical coloring methods and avoid environmental pollution.The obtained anodized coating on stainless steel was black and had excellent heat resistance and wear resistance.