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

Figure 12

Scratch testing data for the sample with PEO coating containing ZrO₂ nanoparticles and image of the scratch after the experiment: lines correspond to the values of loads, at which scaling of coatings parts (а) and its plastic abrasion down to metal () (b) occur. 1: applied load, 2: depth of indenter penetration at load, 3: acoustic emission, 4: friction force, and 5: residual depth of indenter penetration after unloading.