Abstract
Recent methods using electronic potentiostats allow electrode potential to be altered as a controlled function of time.The transpassivity of iron and several steels has been studied by these methods, with a rate of variation of potential between 10−2 and 150 V/min, the current/potential curve with the electrode potential as independent variable being obtained.In the transpassivity region of 18-8 austenitic stainless steels, a fall of current corresponding to a decrease of dissolution rate of the alloy-secondary passivity-is observed.The phenomenon, as reported elsewhere, is connected with the carbon content, and at sufficiently low carbon content, with the rate of variation of anode potential. Further work with pure iron and steels having carbon content between 0·001 and 0·3 der cent shows that the phenomenon still depends intimately on the rate of potential variation and moreover that it is connected with the surface condition of the electrode.
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