Electrochemical Behavior of Gradient Polished Surface of Hot Dipped Al–Si Coated Steel

抄録

A novel method for coating surface polishing has been applied for a systematic study of the localized individual coating regions of the Al–Si coated steel. Polarization, EPMA and corrosion potential measurements have been applied for determination the ability of each region for protection of underlying steel. The susceptibility of the Si rich region, interface region and Fe-rich region to pitting corrosion decreases in the following order: Si-rich region>Fe-rich region>interface region. The elemental distribution of Si and Fe plays an important role in the corrosion behavior of coating film and influences its susceptibility to pitting process.