Abstract
The electrochemical behaviour of AISI 304 stainless steel has been studied in de-aerated methanolic solutions containing different concentrations of H2SO4 (0.001–1 M). During cathodic polarization diffusion controlled behaviour is observed which is prominent, particularly in mixtures containing low concentrations of acid in methanol solutions. With anodic polarization the critical current for passivity increases as the concentration of sulphuric acid is increased in methanol. In anodic studies in 1 and 0.1 M H2SO4-methanol solutions, cathodic loops are observed. Transpassivity is observed at above 1.1 V in high concentrations of H2SO4. After anodic polarization the electrode surface was examined by SEM which showed numerous pits in each concentration of acid in methanol. The pitting potential is found to be nobler with higher acid concentrations.
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