Abstract
The corrosion reaction of iron in acid solutions have been studied by means of chemical kinetics. The cathodes of local cells in iron are oxygen electrodes at higher pH than 4 and hydrogen electrodes at lower pH than 4. The corrosion ersistivity of metals K is related to the standard electrode potential EM0 and the specific reaction rate constant of hydrogen electrode K1 by the expression(This article is not displayable. Please see full text pdf.) \ oindentwhere n is the valency of metal ions. 1>α>0, T the absolute temperature and R and F are universal constants. There seems to be some relation between K and the work function of metals. The general Eq. of corrosion rate are as follows:(This article is not displayable. Please see full text pdf.) \ oindentwhere β is a constant of the anode film, β≥1, C is the concentration of adsorbed water molecule on metals, DM is the diffusion constant of metal ions and δm the thickness of diffusion layer.
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