Polishing refers to the use of mechanical, chemical or electrochemical action to reduce the surface roughness of the workpiece to obtain a bright and smooth surface.
Anodizing is electrolytic process that deposits a chemically stable oxide layer on aluminum surfaces. The resulting oxide film is thicker and stronger than the native oxide coating of aluminum.
Micro-arc oxidation MAO, also known as plasma electrolytic oxidation PEO, is developed on the basis of anodizing technology and forms a coating superior to that of anodizing.