金属間化合物FeAl，FeAl(Cr)の塩酸，水酸化ナトリウム，食塩水中での腐食特性

概要

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To obtain information about the corrosion characteristics of aluminum treated in a pressurized vessel. Corrosion tests on inter-metallic compounds FeAl and FeAl(Cr) in 1 mole solution of HCl, NaOH, and NaCl were performed. As a result, the mass decreasing curves of FeAl and FeAl(Cr) in HCl solution were at first greatly increasing to approximately 90 kg/m2 per year until hitting 250 ks, and then decreasing to one-fiftieth at 2200 ks. The mass decreasing curves of SUS316 steel and CrMo steel in HCl solution were continuously changed, compared to the inter-metallic compounds. It is clear that the mass decreasing rate of FeAl(Cr) at 2200 ks was nearly equal to that of SUS316 steel, which the rate became larger in order for SUS316 steel≒FeAl(Cr), FeAl, CrMo steel. The cause of the decreasing corrosion rate at 2200 ks seems to be because of the formation of AlO(OH) or CrO(OH). The mass decreasing rate in NaCl solution became larger, in the order of SUS316 steel, FeAl(Cr), FeAl, and CrMo steel. However, corrosion in NaOH solution for all the materials was hardly observed.