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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