Abstract
Corrosion rates and electrode potentials of some carbon steels in HCl solutions have been measured. The influence of acid concentration, carbon content, annealing and temp has been examined. Corrosion rates and electrode potentials increase exponentially with acid concentration. The influence of carbon content is most pronounced when cémentite exists as a separate phase. Annealing counteracts this effect. The corrosion rates in 3N HCI fit the Arrhenius equation; ΔG is lower for the steel containing cementite than for steels containing ferrite as a separate phase. The results are interpreted by assuming cathodic control.
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