The aim of the present study was to develop the deposition process of cerium compound doped phosphate–permanganate conversion coating on the carbon steel surface and to evaluate its protective and self-healing capacities. The SEM and XPS techniques were applied to characterize the structure and composition of the investigated coatings. Voltammetric measurements were carried out to determine the protective ability of the passive layer, while EIS studies yielded information on the self-healing properties of different protective systems affected by introduced artificial defects. The phosphate–permanganate conversion coating on carbon steel was chosen as the base for deposition of cerium films from the Ce(NO₃)₃ solution without and with SO₄^2– ions. The presence of permanganate in the phosphating solution and incorporation of Ce into the phosphate–permanganate layer on the steel surface increase the protective ability of the conversion coating. It was stated that the low frequency impedance has the same value as before the scratch formation. This suggests that the presence of Ce in the phosphate–permanganate coating leads to high values of low frequency impedance due to the healing of defects. These coatings provide corrosion protection for carbon steel and can be candidates for development of environmentally friendly pretreatments.

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