塩化物-硫化物水溶液中におけるステンレス鋼のエロージョン・コロージョン

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  • Erosion-Corrosion of Stainless Steels in Aqueous Chloride-Sulfide Solution
  • エンカブツ リュウカブツ スイヨウエキチュウ ニ オケル ステンレス コウ ノ

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Erosion-corrosion attack of stainless steels was investigated in aqueous solution containing chloride and sulfide, and effects of material factors on the relation between electrochemical characteristic and erosion-corrosion resistance were elucidated. Erosion-corrosion attack of solution treated steels was influenced by pH of solution and alloy composition. This attack depended not on hardness but on corrosion resistance. Although an excellent relation is obtained between erosion-corrosion weight loss and pitting potential at constant pH, the relation varied with pH. No dependency on pH was observed for the relation between the weight loss and the repassivation potential, thus this potential is considered to be valid for evaluation of erosion-corrosion resistance. For sensitized steels, this evalutation by repassivation potential was valid to N bearing stable austenitic steels, but it is not applicable for the steels susceptible to selective attack due to carbide or σ phase precipitation.

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