Abstract

Hydroxyapatite coating by alternative dipping method on light metals such as Al, Mg and Ti having porous surface was studied with focusing on the morphology and composition of the surface layer. HAp coating is significantly enhanced by porous substrates having a pore size of 10 nm ~ 30 nm, i.e., mesoporous range. Incorporated electrolyte species into the substrates assist the precipitation of HAp in the following order: Sulfuric acid ≧ NaOH > Oxalic acid > Phosphoric acid. Plate-like deposit was formed on Mg substrate having thin natural oxide or defective anodic films. However, no deposit was found on chemically etched surface. Thus, it was clarified that the meso-porous size as well as incorporated anions of porous substrate strongly affected to the HAp coating.

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