Abstract
The variation with time in the open-circuit potentials of four different steels was followed in aerated stagnant and stirred equimolar solutions of NaCl, Na 2SO 4 and NaNO 3. In all cases the potentials shifted towards more positive values, denoting film formation and thickening. Plots of the potentials as a function of the logarithm of immersion time were linear, showing that film growth followed a direct logarithmic law. No substantial difference was found in the thickness of oxides grown in stirred solutions and those produced under still conditions. Differences were noted in the behaviour of the steels in chloride and sulphate solutions, on the one hand, and in nitrate solutions, on the other.
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