塩酸溶液中におけるSUS304およびSUS316オーステナイトステンレス鋼の選択溶解挙動

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タイトル別名
  • The Selective Dissolution of SUS304 and SUS316 Austenitic Stainless Steels in a Hydrochloric Acid Solution
  • エンサン ヨウエキチュウ ニ オケル SUS304 オヨビ SUS316 オー

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The anodic behavior and selective dissolution of SUS304 and SUS316 austenitic stainless steels were investigated as a function of potential in a 1 kmol·m−3HCl solution by using electrochemical technique and Inductively Coupled Plasma Emission Spectrometry (ICP).<BR>On the basis of the comparison between the amount of total anodic charge passed and that of electric charge obtained from dissolution, it was found that the anodic polarization curves of SUS304 and SUS316 were divided into three regions, the active dissolution, the film formation, and the film destruction. The compositions of metal ions dissolved in the solution revealed that the preferential dissolution of Fe took place on both steels in the active dissolution region and led to the enrichment of Cr on SUS304 surface and that of Cr, Ni and Mo on SUS316 surface. In the region of the film formation, it was found that a film formed on SUS304 was enriched with Cr because of the preferential dissolution of Fe. In the case of SUS316, it was suggested in terms of the preferential dissolution of Ni and Mo that a film changed from Cr, Ni, Mo-rich layer into Cr-rich layer during anodic oxidation.<BR>It was, furthermore, deduced that Mo lowered the activity or density of active centers such as MnS on SUS316 surface in the process of active dissolution and consequently contributed to the formation of a uniform film free from defects.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 47 (5), 413-419, 1983

    公益社団法人 日本金属学会

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