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The role of  pH  value and H 2 S concentration on the sulfide stress corrosion cracking of API 2205 duplex stainless steel was studied by means of slow strain-rate tests, polarization curve measurements and surface analysis. It was found that 2205 duplex stainless steel was highly susceptible to sulfide stress corrosion cracking as  pH  decreased and H 2 S concentration increased. When the  pH  value was 2.8, the susceptibility stayed at a low level in 500 ppm H 2 S concentration but there existed a critical H 2 S concentration between 500 ppm and 1 000 ppm, above which the susceptibility rapidly increased. The sulfide stress corrosion cracking resulted from hydrogen-induced cracking and exhibited the characteristics of hydrogen embrittlement. The boundary of a phase and γ phase promoted the initiation of stress corrosion cracking, while γ phase inhibited its propagation.

Effect of pH and H 2 S concentration on sulfide stress corrosion cracking (SSCC) of API 2205 duplex stainless steel