Tatsuo Maekawa1, Nobuo Nakajima1 and Masaru Kagawa1
1Engineering and Research Laboratory, Mitsubishi Atomic Power Industries Incorporated, Saitama
Anodic polarization behaviors of AISI Type 304 and 304L stainless steels in deaerated sulfuric acid solution were studied as the function of the cold-working degree, ferrite content and surface finish by means of a potentiostat. The results may be summarized as follows: (1) When the ferrite phase was produced by cold working, a significant effect of the ferrite phase on the current density was observed in the active region, and the critical current density increased approximately in proportion to the ferrite content. However, in passive and transpassive regions, no effect of the ferrite phase was observed. (2) When no ferrite was produced, the anodic behaviors seemed unaffected by cold-working. (3) Anodic behaviors of the annealed stainless steel which has the property to produce the ferrite phase by cold-working were significantly affected by abrading of the surface.
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