Fabrication of Coatings on the Surface of Magnesium Alloy by Plasma Electrolytic Oxidation Using ZrO₂ and SiO₂ Nanoparticles

Figure 10

Equivalent electrical circuit used to fitting experimental impedance spectra of the MA8 magnesium alloys samples with PEO coatings. CPE₁, and CPE₂, , the constant phase elements and the resistances of the outer porous layer and the inner nonporous layer, respectively. , the electrolyte resistance.