Relationship between susceptibility to embrittlement and hybrogen permeation current for UNS G10190 steel in 5%NaCl solution containing H{sub}2S

摘要

The sulphide stress corrosion cracking (SSCC) behaviour of UNS G10190 steel in a 5% sodium chloride (NaCl) solution containing hydrogen sulphide (H{sub}2S) was studied by slow strain rate tensile testing (SSRT), scanning electron microscopy (SEM), and the electrochemical hydrogen permeation technique. The results revealed different cracking mechanisms and hydrogen permeation currents I{sub}H for UNS G10190 steel sheet in different concentrations of H25 solution. The susceptibility to SSCC of UNSG10190 steel in a 5%NaCl solution containing H{sub}2S was evaluated from the permeation current I{sub}H (μA) which depended on the H{sub}2S concentration C (ppm) according to the relationship I{sub}H = 24.5C{sup}0.36. It is shown that the use of anelectrochemical hydrogen permeation probe is a practical way to assess susceptibility to SSCC.