An electrochemical study on the influence of oxygen in tinplate corrosion and inhibition

Abstract Four substrates were studied: tinplate; pure tin; alloy layer (FeSn 2 ); and bare steel. The experiments were carried out in citrate solutions of pH = 6, both aerated and de-aerated, with and without inibitor. The following experimental techniques were used: polarisation curves, polarisation resistance and impedance. The results show that oxygen is of great importance in the process of tinplate corrosion. In aerated solutions the corrosion inhibitor is much more effective on bare steel than on the remaining materials tested. Data on the open circuit potential show that the inhibitor used is primarily anodic.