高温濃厚苛性ソーダ溶液中における実用ステンレス鋼の腐食

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タイトル別名
  • Corrosion of Various Commercial Alloys in Hot Concentrated Caustic Soda Solutions
  • コウオン ノウコウ カセイソーダ ヨウエキチュウ ニ オケル ジツヨウ ステン

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説明

The corrosion behaviour of various commercial alloys was studied by measurements of potentio-dynamic polarization curves, the change in corrosion potential with time and the average corrosion rate. The corrodent used was 48%NaOH solution at temperatures between 373 and 473 K, and the following results were obtained. The corrosion resistance of stainless steels was improved by adding nickel and chromium. Especially, immersion tests showed that ferritic stainless steels containing 27-30% chromium and austenitic stainless steels containing nickel more than 20% possessed excellent corrosion resistance. On the other hand, addition of molybdenum and copper to the stainless steels gave no protective effects as to the alkaline corrosion. When the corrodent was a 48%NaOH solution obtained by the diaphragm process, NaClO3 contained in the solution acted as an oxidizer. Its oxidation powder increased somewhat the tendency of the high chromium steels to become passive, but promoted dissolution of nickel.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 49 (3), 202-209, 1985

    公益社団法人 日本金属学会

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