Plasma electrolytic oxidation for surface protection of aluminium, magnesium and titanium alloys

Abstract

Plasma electrolytic oxidation can harden the surface of aluminium to the extent that it enables steel replacement in many applications. On magnesium, the technology offers a chromium-free corrosion protection superior to that offered by hexavalent chromium. Finally, on titanium, the process offers wear protection, an anti-galling surface, and a bio-compatible surface. In all cases, the process offers coating structures and compositions which cannot be achieved by any other techniques.