Abstract
This study aimed to elucidate the effect of “pre-treatment” and “post-treatment” operations on the corrosion resistance of ceria conversion coatings (CCOC) deposited on Al-1050. Based on the XPS data, it has been ascertained that there is a substantial influence of the phosphate post-treatments on the chemical composition and state of the elements on the surface of studied systems. The concentrations of Al2O3 and Ce2O3 + CeO2 components in CCOC are reduced at the expense of the formation of AlPO4 and AlOOH, CePO4 as well as PO3-, P2O5 and P4O10 compounds with Al and Ce. Electrochemical and XPS investigations revealed that these layers are a more effective barrier against diffusion of Cl− to the Al surface, increasing the resistance to the pitting and general corrosion.
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