Keronite surface treatment technology is based in the principles of Plasma Electrolytic Oxidation (PEO) or Micro Arc Oxidation (MAO) whereby a modulated electrical current is passed through a bath of proprietary electrolyte solution, converting the surface of light alloys into a hard yet flexible ceramic coating. Aluminium or magnesium parts are suspended from a bus bar and submerged in the electrolyte inside a stainless steel electrode cage. During the PEO surface treatment process, a controlled plasma discharge is formed on the surface of the light alloy, fusing the oxides of the substrate into a harder phase.