CORROSION BEHAVIOR OF AMORPHOUS ALLOYS
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概要
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Amorphous iron- and nickel-base alloys containing certain amounts of chromium and phosphorus possess an extremely high corrosion resistance. In particular, the amorphous alloys are practically immune to corrosion in various neutral and acidic solutions containing chloride ions. However, when boron and/or silicon are added to the amorphous alloys instead of phosphorus, the amorphous Fe-Cr-B-C and Fe-Cr-B-Si do not show a high corrosion resistance. The corrosion rate decreases in the order of the alloy containing silicon, boron, carbon and phosphorus in acidic solutions. The extremely high corrosion resistance of the amorphous alloys is interpreted in terms of the rapid formation of a uniform passive hydrated chromium oxy-hydroxide film. The chemically homogeneous single phase nature of the amorphous alloys without crystalline defects provides the formation of a uniform passive film without weak points with respect to corrosion. Phosphorus contained in large amounts in the amorphous alloys accelerates the active disolution of the alloys. The rapid active dissolution leads to the rapid enrichment of chromium species in the alloy/solution interface and to the rapid formation of a significantly chromium-enriched passive film. On the contrary, boron and silicon do not facilitate the active dissolution and interfere the chromium enrichment in the passive film due mainly to the fact that they are incorporated in the film as borate and silicate. The hydrogen embrittlement of some amorphous alloys is also described.
- 東北大学の論文
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