光輝焼鈍した 430 フェライトステンレス鋼の酸化皮膜の結晶構造と防食効果に及ぼす Mn, Si 量の影響

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The crystal structures of oxide films formed on the surface of 17% Cr-Fe alloys containing various amounts of Mn and Si, when treated in H_2-H_2O atmospheres with dew points of -25°and -36℃, were investigated. The influence of the oxide films with different crystal structures on the corrosion resistance of alloys to dilute sulphuric acid was also studied. The results obtained are as follows : The alloys form (Cr. Fe)_2O_3, MnCr_2O_4 and SiO_2, depending on the content of Mn and 【Si, even when the oxygen potentials (dew points) of the atmospheres are those that would normally produce a Cr_2O_3 film on pure Cr-Fe alloys. These oxides show less resistance to corrosion than Cr_2O_3. A pure 17% Cr-Fe alloy forms only Cr_2O_3 and exhibits especially excellent corrosion resistance. However, 17% Cr-Mn-Fe alloys with a small amount of Mn in the range of 0.08 to 0.25% appear to form spinel type (MnCr_2O_4 etc) oxides and have a different behavior in their resistance to corrosion. The minimal corrosion rate is attained at 0.08% Mn, beyond which the corrosion rate increases as the Mn content increases. On the contrary, the 17% Cr-Si-Fe alloy with a Si content of 0.10% forms (Cr. Fe)_2O_3 and SiO_2. When the Si content is increased beyond 0.10%, (Cr. Fe)_2O_3 disappears and Cr_2O_3 forms, improving corrosion resistance. The corrosion resistance behavior of the alloys mentioned above can be explained by the variation of the crystal structures and thickness of the oxide films formed under varying controlled atmospheres.
社団法人日本鉄鋼協会の論文
1983-01-01

光輝焼鈍した 430 フェライトステンレス鋼の酸化皮膜の結晶構造と防食効果に及ぼす Mn, Si 量の影響

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