Advancement of plasma electrolytic oxidation towards non-valve metals

Discharge phenomena in electrolytes were discovered many decades ago. However, the research and development of plasma oxidation for surface engineering have only truly been actively performed recent years, particularly stimulated by a review paper entitled Plasma Electrolysis Surface Engineering published 1999. Among electrolysis processes, electrolytic (PEO) caught most attention from academic industrial communities. PEO has largely restricted to valve metals, such as Al, Mg Ti their alloys. This intends explore current boundaries process extend it into non-valve metals. The therefore first describes coating growth mechanisms which are different conventional (conversion) on Particular emphasis is given revealing details deposition behavior through direct observations analysis metallic substrates coatings formed at timescales process. Copper ferrous materials chosen appropriate metal properties terms mechanical, corrosion, thermal electrical aspects summarized. results show that high hardness adhesion strength, corrosion resistance, good insulation performances achievable PEO-derived These also open doors emerging applications, example vehicles. Such applications presented reporting application an e-motor bearing brake disc two examples. Future perspectives discussed with hope stir new wave metals realized previous research.