• Nakatsuji, S.
• Hasegawa, Y.
• Kitagawa, Yuichi
• Shoji, S.
• Yanagimoto, H.
• Fushimi, Koji
• Baba, K.

Abstract

<jats:p>A liquid-phase ion gun (LPIG) was used to create a local H<jats:sub>2</jats:sub>S enriched environment near Cr-containing steel surface in Na<jats:sub>2</jats:sub>S solutions in attempt to induce sulfide stress cracking on the specimen surface. In a 1.5 mM Na<jats:sub>2</jats:sub>S solution, anodic polarization of LPIG Pt microelectrode at a potential of 1.90 V vs SHE resulted in that local solution was successfully acidified to below pH 4, a pseudo-sour environment. When Cr-containing steels were potentiostatically polarized under this pseudo-sour environment by LPIG, sulfides were formed on the specimen surface depending on Cr-concentration, specimen potential, and chloride ion in solution. When LPIG was operated on Cr-containing steels subjected to tensile stress using a four-point bending tester, cracks were formed on the steel surface.</jats:p>

Topics

• surface
• phase
• crack
• steel
• Cr-containing