Oxide Films Formed on Pure Iron in Concentrated Hydrochloric Acid

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Abstract

WORK is being done in this laboratory on various atmospheric corrosion problems. An apparatus has been set up which measures corrosion-rates by following the oxygen consumption. This apparatus will be described elsewhere. During early stages of this work, an investigation was carried out to find a suitable method for cleaning specimens so that repeated use could be made of them. It was found then that treatment of specimens of enamelling iron (C = 0·01, Ni = 0·1, Cr = 0·1, Si = 0·005, Mn = 0·14, trace Cu, Sn, As, Al and Ca) in hot dilute hydrochloric acid gave fairly reproducible corrosion-rates using half-normal sodium chloride solutions in the apparatus. Treatment in cold concentrated hydrochloric acid reduced the corrosion-rate of the specimens to a value approximately one and a half times less than the rate after treatment in the dilute acid.

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References

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    Guitton, L., C.R. Acad. Sci., Paris, 203, 1254 (1936).

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    Müller, W. J., and Machu, W., Z. Elektrochem., 41, 641 (1935).

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    Yamamoto, Inst. Phys. Chem. Res. Bull. Tokyo, 17, 517 (1938).

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WHITTON, W. Oxide Films Formed on Pure Iron in Concentrated Hydrochloric Acid. Nature 163, 763–764 (1949) doi:10.1038/163763a0

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