Plasma electrolytic oxidation of an Al-Cu-Li alloy in alkaline aluminate electrolytes: A competition between growth and dissolution for the initial ultra-thin films

Plasma electrolytic oxidation(PEO) of a 2A97 Al-Cu-Li alloy (a) without and (b)with a thin pre-existing PEO film in 32 g l−1 NaAlO2 + 1 g l−1 KOH.