Effects of phosphates on microstructure and bioactivity of micro-arc oxidized calcium phosphate coatings on Mg–Zn–Zr magnesium alloy

Corrosion behavior of a self-sealing pore micro-arc oxidation film on AM60 magnesium alloy

“…Cl ions are susceptible to penetration the film inward through the micro-pore regions, which are detected by EDS as illustrated in Tab. 1 [24,25]. The presence of Cl ions can accelerate the dissolution of MgO within the micro-pores [26].…”

Biofunctional composite coating architectures based on polycaprolactone and nanohydroxyapatite for controlled corrosion activity and enhanced biocompatibility of magnesium AZ31 alloy

“…These include conversion coatings [14,15], sol-gel coatings [15], chemical deposition [16,17], micro-arc oxidation [18][19][20], hydroxyapatite coatings [21,22] and organic coatings [23]. For example, fluoride-based surface treatments of Mg alloys enhance bone regeneration [24,25] and delay the corrosion process as a result of MgF 2 formation but do not provide long term corrosion protection, so early failure of the implant may occur [26].…”

Calcium orthophosphate deposits: Preparation, properties and biomedical applications

“…Furthermore, the nature of the substrates was found to influence both the morphology and the composition of the MAO deposits[531]. In the presence of Ca-and Pcontaining salts, such deposits also contain various Ca-and P-containing compounds (but rarely CaPO 4 )[327,[532][533][534][535][536][537]. For example, MAO coatings on Ti were found to consist of a complicated mixture of titanium oxides (both anatase and rutile phases),…”