2 相ステンレス鋼の耐食性におよぼす冷間加工とフェライト量の影響

概要

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The effects of cold working and volume fraction of ferrite on corrosion behavior of the active and pitting region of duplex stainless steel have been studied in sulfuric acid and chloride media. The main results obtained are summarized as follows : (1) In boiling 5% H_2SO_4 solution, the corrosion loss and the critical current density for passivation of specimens decreased with the progress of working and the increase in α content. In all of the specimens, the preferential dissolution phase in the active region was γ, but the dissolution of γ was retarded by working. (2) In boiling 5% H_2SO_4+NaCl solution, the corrosion loss, in not more than 0.1% NaCl, was less in specimens containing much α and undergoing much degree of working. In case of 1% NaCl, however, it was more in those specimens. The preferential dissolution phase in the active region, on additions of 1% NaCl, changed by working and α content and it changed obviously with potential in specimen containing the least α. (3) In 3% NaCl solution at 30℃, it was found that pitting potentials had a tendency to become noble with the increase in α content, the effect of working on that, however, was not obvious. In all of the specimens, the pitts produced with anodic polarization occurred in γ and grew preferentially into γ.
社団法人日本鉄鋼協会の論文
1983-09-01