Abstract
AbstractThe electrochemical behaviour of commercial tin anodes in sea water at different scan rates, pHs, temperatures and in the presence of some additives has been investigatesd. Open circut potentials (OCP), linear polarization (Rp) and potentiodynamic measurements revealed that the behaviour is dependent on the above mentioned conditions. The plot of critical current density (Cd) vs. the square root of the scan rate (SR) gave a straight line with positive slope and passing through the origin indicating diffusion kinetics for the anode film formation. The analysis of data in neutral sea water and Cl− solutions leads to the conclusion that the film is formed from tin oxides and/or hydroxides. The morphology of the electrode surface was found to be dependent on the operating conditions as the scanning electron microscopy studies suggested. On the other hand EDX analysis showed different amounts of chloride on the surface layer depending on pH. The O2 evolution was not observed upto 3.5 V (SCE).
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