Abstract
Corrosion rates in dilute phosphoric acid containing a food additive (Blue Dye No. 1) are reported for four mild steels approximating in composition steels used commercially for tin plate manufacture. Specimens taken from various stages of tin plate manufacture (slab, hot strip rolled, first cold reduction, annealed, second cold reduction, tin plate) show that corrosion rates of cold worked steels exceed those of annealed steels by as much as an order of magnitude. The time dependence of corrosion rate is a function of the amount of cold work. The corrosion rate of fully annealed specimens approaches a steady state in a way consistent with the hypothesis that a corrosion inhibitor is generated during the corrosion process in solutions containing Blue Dye No. 1.
