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The effect of tensile stress on the passive film formed on carbon steel in chloride-free alkaline solutions is investigated. Results indicate that tensile stress induces crack-shaped micro-defects on the passive film, with film-penetrating fractures detected under high stress levels. Electrochemical noise (EN) measurements successfully capture instantaneous current spikes, signaling localized metal exposure due to passive film rupture. Furthermore, rapid repassivation occurs following localized film rupture under elastic stress conditions. Note that, the presence of chlorides may alter this behavior, warranting further investigation.

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Tension-Induced Mechanical Damage on Passive Film of Carbon Steel in Alkaline Environment

  • 会议论文

  • 发表日期：

    2026年

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  • Zheng Dong,
  • Ueli Angst

摘要

The effect of tensile stress on the passive film formed on carbon steel in chloride-free alkaline solutions is investigated. Results indicate that tensile stress induces crack-shaped micro-defects on the passive film, with film-penetrating fractures detected under high stress levels. Electrochemical noise (EN) measurements successfully capture instantaneous current spikes, signaling localized metal exposure due to passive film rupture. Furthermore, rapid repassivation occurs following localized film rupture under elastic stress conditions. Note that, the presence of chlorides may alter this behavior, warranting further investigation.