Ta Influence on Corrosion Resistance of Cr Coatings via Electrospark Deposition

Cr and Cr–10Ta coatings were prepared on CrNi3MoVA using electrospark deposition technology and evaluated for their corrosion resistance. The findings indicated that the Cr–10Ta coating demonstrated a 76% decrease in corrosion current density (Icorr) and a 13% increase in corrosion potential (Ecorr) compared to the CrNi3MoVA. The Cr coating exhibited a 46% reduction in Icorr and an 8% elevation in Ecorr. The charge transfer resistances of the Cr and Cr–10Ta coatings were 1.5 and 6.4 times higher than that of the CrNi3MoVA. The Cr–10Ta coating demonstrated better corrosion resistance than the Cr coating for the latter had a localized corrosion.