No abstract

The inhibition effect of molybdate on stress corrosion cracking (SCC) was investigated by many researchers, but few considered the molybdate effect on hydrogen permeation and the relationship between SCC and hydrogen permeation. This paper presents the effect of molybdate on SCC susceptibility and hydrogen permeation through the 2205 super duplex stainless steel in a sulfuric acid solution. An addition of molybdate has an interesting influence. It decreases the SCC susceptibility. With its increasing concentration, the inhibition effect on the hydrogen permeation remains steady. Attempts were made to understand this behaviour based on the role of molybdate in hydrogen permeation and pitting characteristics of the 2205 stainless steel in a sulfuric acid solution.