Blackening of Bearing Stainless Steel 9Cr18

The technology of blackening for bearing stainless steel 9Cr18 was studied.The electrolytic technology could greatly improve the corrosion resistance of blackened bearing stainless steel and its hardness was maintained.The scanning electron microscopy (SEC) and auger electron spectroscopy (AES) showed that the main factors of corrosion resistance was the increasing of the rate of Fe/Cr in the black film.