| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1529473 | Materials Science and Engineering: B | 2012 | 9 Pages |
This study elucidated structure and mechanical properties of the electroplated hydroxyapatite/nano-TiO2 composite coatings on Ti–6Al–4V alloy. Their effect on the corrosion and wear corrosion resistance in Hanks’ solution was examined as well. The anodizing process was performed on Ti–6Al–4V alloy surface to enhance the adhesion of these composite coatings on Ti alloy. Anodizing treatment was then conducted at 10 V at room temperature with different times of 40, 50, 60, 120 and 180 min. Experimental results indicate that the hardness of Ti–6Al–4V alloy was increased due to the anodizing treatment, capable of improving the adhesion of electroplated calcium phosphate coating in addition to the electroplated hydroxyapatite/nano-TiO2 composite coatings. Additionally, the coatings on anodic substrate exhibited a higher uniformity and Ca/P ratio and thickness than that on nonanodized substrate. The nano-TiO2 particles could be co-deposited on the Ti–6Al–4V alloys and capable of reinforcing the hydroxyapatite coating, subsequently increasing the hardness and refining the structure. Moreover, the corrosion and wear corrosion resistance of the electroplated hydroxyapatite/nano-TiO2 composite coatings were also improved significantly when increasing the duration of anodizing alloy substrates.
► Anodic oxide film of Ti–6Al–4V fabricated in phosphoric acid was TiO2 and phosphates. ► The oxide thickness and microhardness increased with increasing anodizing duration. ► The bioactive HA formed on the anodic Ti–6Al–4V substrate was HA composite. ► Nanocomposite HA/TiO2 possessed an excellent wear corrosion protection ability.
