Abstract
The authors have investigated the effect of dissolved oxygen and H2O2 in alkaline solutions upon contact corrosion loss ΔW of zinc, in a zinc-mild steel corrosion couple. Considering oxygen electrode reaction, we have derived a formula of ΔW, k and concentration C of H2O2, which shows that the smaller the value of k and the electric resistance of the solutions, the larger is the value of \left|\dfrac∂ΔW∂k\ ight|, and have interpreted the observed effect by calculating the extent of change of ΔW, in the case of k taking a value according to the amount of dissolved oxygen or H2O2. ΔW increases by adding a small amount of H2O2 and shows a decline as the dissolved oxygen decreases. The reason why ΔW increases is, it appears, in the case of pH 7, mainly due to the depolarization of cathode effected by the dissolved oxygen or H2O2, and in the case of pH 12.5, due to the fact that the corrosion product Zn(OH)2 changes into a soluble substance HZnO2− or ZnO2−− and both the electrodes depolarize.
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