| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1607478 | Journal of Alloys and Compounds | 2016 | 8 Pages |
•Crack-free hybrid coatings were fabricated on AZ31 magnesium alloy.•Hydrothermal treatment repaired the defects in the precursor coating.•Increasing temperature promoted the crystallization of HA.•Hybrid coatings showed good corrosion resistance.
To improve the corrosion resistance of AZ31 magnesium alloy, a crack-free hydroxyapatite/phytic acid (HA/PA) hybrid coating was synthesized on AZ31 substrate via a chemical conversion deposition to form precursor coating, and followed by a hydrothermal treatment in the saturated CaO solution. During the hydrothermal treatment, the phosphate and calcium ions diffused to the interface of the precursor coating/solution to form amorphous CaP compound and subsequently crystallized into HA particles that repaired the defects in the precursor coating and exhibited a high bonding strength of 24.3 ± 1.7 MPa between the hybrid coating and the magnesium alloy substrate. Electrochemical measurements in simulated body fluid (SBF) revealed that the HA/PA hybrid coating could effectively provide protection for magnesium (Mg) alloy on account of the stable barrier properties.
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