Abstract
Experiments using photopotential, galvanic current, a.c. impedance and harmonic analysis techniques were carried out to observe the effect of visible light on mild steel in a citric acid solution. The photopotential and galvanic current techniques show that the steady state potential and current after illumination of one of the electrodes is negative with respect to the electrode in darkness. Both the impedance and harmonic analysis techniques indicate an increase in the corrosion rate of the illuminated electrode. On coating the mild steel with a vinyl lacquer, the effect of illumination is eliminated.
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