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Abstract

The sulphide stress corrosion cracking (SSCC) behaviour of UNS GI0190 steel in a 5% sodium chloride (NaCl) solution containing hydrogen sulphide (H₂S) 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_H for UNS G10190 steel sheet in different concentrations of H₂S solution. The susceptibility to SSCC of UNS G10190 steel in a 5%NaCl solution containing H₂S was evaluated from the permeation current I_H (μA) which depended on the H₂S concentration C (ppm) according to the relationship I_H = 24·5C^0·36. It is shown that the use of an electrochemical hydrogen permeation probe is a practical way to assess susceptibility to SSCC.

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

Abstract

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