Effect of Applied Potential on Stress Corrosion Cracking Susceptibility of 13Cr and 17Cr Martensitic Stainless Steels

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  • 13Crおよび17Crマルテンサイト系ステンレス鋼の応力腐食割れ感受性に及ぼす付与電位依存性
  • 13Cr オヨビ 17Cr マルテンサイトケイ ステンレス コウ ノ オウリョ

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Stress corrosion cracking susceptibility of 13Cr and 17Cr martensitic stainless steels was examined as a function of applied potential under slow strain rate test conditions in 1N-H2SO4 and neutral chloride solutions. The steels tempered at 550°C (sensitized) exhibit active path type stress corrosion cracking in the transition potential region betweem dissolution and passivation of Cr depleted zone in 1N-H2SO4 solution at room temperature. On the other hand, in 20-20, 000ppm chloride solution at 10-80°C the same steel shows active path type stress corrosion cracking independent of applied potential. Stress corrosion cracking occurs only in the environment in which the potential of the bottom of the localized corrosion attack is steadily kept in the above transition potential region, while in a mild environment the steel is repassivated and in an aggressive environment it shows pitting and crevice corrosion, thus being unable to keep the potential in the above cracking region. The steels tempered at the temperature other than sensitizing one do not show active path type stress corrosion cracking at the entire potential region tested (-0.6-+0.4V vs. SCE). Hydrogen embrittlement occurs at the cathodic potential and stress corrosion cracking susceptibility in neutral chloride solutions increases with increasing temperature and chloride concentration. Consequently the localized corrosion and stress corrosion cracking susceptible regions are plotted in the temperature-chloride concentration diagram.

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