Mechanism and Properties of Al2O3-Ru Composite Coatings Prepared by Cathode Plasma Electrolytic Deposition
Alumina coatings doped with different precious metals were prepared by cathode plasma electrolytic deposition.Results show that the porosity of precious metal-doped alumina coatings(especially Al2O3-Ru)decreases,and the high-temperature cyclic oxidation resistance and spallation resistance are enhanced.The Al2O3-Ru composite coating shows better effect:its average oxidation rate K and average amount of oxide spallation G are minimum.Meanwhile,Nernst equation was used to explain the simultaneous deposition of precious metal and alumina,and the whole process and mechanism of deposition were analyzed.
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