Effect of surface potential on corrosion behavior of the fusion boundary in the dissimilar welds between 316L stainless steels and Inconel 182 alloy

The microstructure, surface potential value and corrosion properties of fusion boundary in 316L stainless steel/Inconel 182 dissimilar welds were investigated. The results indicated that there were two different types of fusion boundaries alternately distributed in the dissimilar welds, and there was a large potential value difference between two sides of the fusion line in different types of fusion boundaries. The oxides and oxidation behavior of different types of fusion boundaries were strongly dependent on their surface potential value change on the fusion boundaries.