Effect of pH and H 2 Sc oncentration on sulfide stress corrosion cracking( SSCC) of API 2205 duplex stainless steelThe role of pH value and H 2 Sconcentration on the sulfide stress corrosion cracking of API 2205d uplex 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 Sc oncentration increased.W hent he pH valuew as 2.8, the susceptibility stayed at al ow level in 500 ppm H 2 Sc oncentration but there existed ac ritical H 2 Sc oncentration between 500 ppm and 1000 ppm, above which the susceptibility rapidly increased.T he sulfide stress corrosion cracking resulted from hydrogen-induced cracking and exhibited the characteristics of hydrogen embrittlement. The boundary of a phase and c phase promoted the initiation of stress corrosion cracking, while c phase inhibited its propagation.R. Liu et al.: Effect of pH and H 2 Sc oncentration on sulfide stress corrosion cracking (SSCC) of API 2205 DSS Int.