FeAlの塩酸水溶液中における耐食性に及ぼすCr濃度の影響

概要

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Addition of Cr in intermetallic compound FeAl improves its corrosion resistance protecting grain corrosion. At the same time it has been clarified that the addition of Cr in FeAl has the possibility to improve the corrosion rate to almost zero. The relationship between corrosion resistance of FeAl(Cr) and Cr contents has been proved.The phenomenon of corrosion rate of FeAl(Cr) that was fast with little Cr addition but slow with much Cr addition was observed. Corrosion rate of FeAl(Cr) which is added until 8 at% Cr is faster than that of FeAl or same. It is getting late at added 10 at% Cr and then addition of 12 at% Cr makes it almost zero. The corrosion of not only FeAl but FeAl(Cr) starts from grain corrosion and it has become obvious there are much Fe at grain boundary of FeAl and FeAl(Cr).Anodic polarization curves for the specimens in 0.1 mol/L HCl solution showed that addition of Cr increased corrosion resistance by forming protective film easily.