Abstract
? 2022 Elsevier B.V.In order to improve corrosion resistance of stainless steels, a CoCrNiMoBC coating was prepared by laser cladding. The microstructure, composition, and crystallographic orientation relationships of the coating were discussed. Electrochemical methods were used to evaluate its corrosion behavior. Results showed that the coating had remarkable resistance to chloride ion corrosion under strongly acidic conditions. The critical pitting temperature of the coating was higher than 80 °C in both neutral and acidic chloride ion environments. Immersion tests confirmed that pits did not expand significantly after 10 days immersion in 5 M HCl solution. The excellent corrosion resistance stemmed from a stable passivation film formed due to the synergistic effects of composition and microstructure.
NSTL
Elsevier