CREVICE CORROSION OF DUPLEX STAINLESS STEEL IN SIMULATED SOUR GAS ENVIRONMENTS

The crevice corrosion behaviour of 22% Cr duplex stainless steel (SS), which has become widely used because of its high strength and stress corrosion cracking (SCC) resistance, was investigated in simulated sour gas conditions. The crevice corrosion is accelerated with increasing partial pressure of hydrogen sulphide and temperature, decreasing pH of the test solution and the addition of sulphur. The duplex SS was more resistant to the crevice corrosion than AISI 316 SS in the hydrogen sulphide-chlorine ion environment. A simple model of the crevice corrosion, in which the initiation process and the mode of crevice corrosion were discussed, was proposed. The crevice corrosion incubation time based on the model was calculated, and the effect of the crevice gap and the partial pressure of hydrogen sulphide was clarified. The mode of the crevice corrosion changed with the partial pressure of hydrogen sulphide, which was explained by the stability of the NiS film and the depassivation pH in the crevice.

• Supplemental Notes:
  • Corrosion, 45 (1989), p.235 (Mar.) [8 pp., 14 ref., 3 tab., 16 fig.]
• Authors:
  • AZUMA, S
  • Tsuge, H
• Publication Date: 1989

Language

• English

Subject/Index Terms

• Old TRIS Terms: Crevice corrosion sulphidisation stainless steel
• Subject Areas: Marine Transportation;

Filing Info

• Accession Number: 00695562
• Record Type: Publication
• Source Agency: British Maritime Technology
• Files: TRIS
• Created Date: Aug 14 1995 12:00AM