クロム炭化物系Ni-Cr複合合金のアノード分極特性(<特集>腐食防食)

概要

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The anodic polarization behavior and corrosion products of Cr carbide-Ni-Cr alloy in soduim sulfate solution containing sodium chloride were studied using electrochemical techniques, scanning electron microscopy and energy dispersive spectroscopy. The investigation was carried out on the thermal spray films processed by the high velocity oxygen-fuel spraying method. An increase in NaCl concentration in the deaerated Na_2SO_4 solution resulted in the increase of the degree of passive current and caused the production of uplifting corrosion film on the Ni-Cr alloy matrix. The Ni element in the Cr_3C_2-Ni-Cr alloy preferentially dissolved at less noble potential in the passive region and not only Ni-Cr alloy matrix but Cr carbide dissolved at more noble potential than 0.7 V vs.Ag/AgCl.
社団法人日本材料学会の論文
1995-11-15