ステンレス鋼の耐食性に及ぼす溶接スケールの影響

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タイトル別名
  • Effect of Weld Scale on Corrosion Resistance of Stainless Steels
  • ステンレス コウ ノ タイショクセイ ニ オヨボス ヨウセツ スケール ノ エ

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The tinted weldments of stainless steels were investigated on their corrosion behavior in aqueous chloride solution. The oxide scale formed on the simulated HAZ of SUS316L was studied by suface analysis techniques. Generally, the pitting resistance of the HAZ with the scale was deteriorated compared with ones whose scale was removed by polishing with emery paper in all stainless steels tested. The comparison of the pitting corrosion behavior between the TIG weldment and the simulated HAZ showed that the pitting resistance of the HAZ was markedly deteriorated by heating at the temperature between about 600 and 700°C. The secondary ion mass spectroscopy (SIMS) analysis of the simulated HAZ revealed that the scale formed by the heating at the temperature below 800°C consisted of Fe oxide on its surface and Cr-Fe oxide by heating at the higher temperature. The Cr oxide in the surface of the scale was found to be transformed into the oxyhydroxide after pitting potential measurement. And, there was a good correlation between the pitting potential of the simulated HAZ and the Cr content in the outer layer of the scale after the pitting potential measurement. Accordingly, the Cr oxyhydroxide is thought to behave like a passive film in aqueous chloride solution.

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