Relation between Abrasion Resistance and Electrolytic Current Wave Forms in Anodization.

There are many research reports on the relation between abrasion resistance and electrolytic conditions and kinds of aluminum alloys in hard anodization.But reports on the relation between electrolytic wave forms porous layer structure and hardness, and abrasion resistance are few. So we studied the effects of electrolytic wave forms on them. The waves examined were direct current, superimposed alternating current to direct current, periodic reverse current and interrupted current.The following results were obtained:(1) The harder the anodized coating, the better the wear resistance.(2) Interrupted current is the best electrolytic wave form in terms of hardness and wear resistance for anodized coatings.(3) A regularly porous layer is not clearly recognizable in this anodized coating.