Abstract
The development of corrosion resistance biological coatings on magnesium and its alloy that can be used for controlling the degradation rate and corresponding biological properties from the surface of implants could have a significant impact in the field of bone tissue regeneration. This work reported the fabrication of quickly deposited biphasic calcium phosphate (CaP) coatings on alkali (sodium hydroxide, NaOH) and acid (hydrofluoric, HF) pretreated magnesium alloy (AZ31) substrates using microwave assisted method. The results indicated that the pretreatment layers (formed on NaOH or HF pretreated AZ31 substrates) could protect substrates from etching of H+ during the deposition process of CaP coating. Meanwhile, different pretreatment layers have been shown to greatly influence the phase component, morphology, thickness and corrosion resistance of the resultant CaP coatings. The CaP coating based on the acid pretreatment layer was mainly composed of compact chrysanthemum-like F-doped hydroxyapatite (HA) with obvious c-axis growth orientation and exhibited excellent corrosion resistance in the simulated body fluid (SBF), which could provide more than 10 weeks of protection for magnesium alloy substrate.
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