Fabrication of calcium phosphate/chitosan coatings on AZ91D magnesium alloy with a novel method

Effect of the addition CNTs on performance of CaP/chitosan/coating deposited on magnesium alloy by electrophoretic deposition

“…Just as the previous work, nano-hydroxyapatite (nHA) for EPD was prepared by chemical precipitation technology [18]. 0.25 g of CS, 1.0 g of nHA particles and 0.025-0.2 g (or without) of CNTs particles were added into 200 ml of an acetic acid aqueous solution under agitation, respectively.…”

Synthesis and in vitro degradation evaluation of the nano-HA/MgF2 and DCPD/MgF2 composite coating on biodegradable Mg–Ca–Zn alloy

“…The Ca/P atomic ratio of HA and DCPD was about 1.41 and 1.52, respectively, which was lower than the theoretical HA value of 1.67. This indicates that calcium deficient HA was deposited on the substrate [20,23]. As the fresh substrate was exposed to the SBF solution, the formation mechanism of calcium phosphate coatings can be illustrated via the following reaction which includes the precipitation reaction and the crystallization process.…”

Surface modification of magnesium and its biodegradable alloys by calcium orthophosphate coatings to improve corrosion resistance and biocompatibility

“…This technique was found to be applicable to deposit ceramic coatings on Mg and its alloys with simultaneous corrosion resistance Liu et al, 2014;Shi et al, 2009Shi et al, , 2011Sreekanth & Rameshbabu, 2012;Wu et al, 2010;Zhang, Dai, et al, 2012;Zhang, Dai, et al, 2013;Zhang et al, 2007). It combines an electrochemical oxidation with a high-voltage spark treatment performed in aqueous electrolytic baths, which also contain modifying elements in the form of dissolved salts (e.g., silicates, borates) to be incorporated into the resulting coatings.…”

“…However, using other techniques, such as chemical precipitation Zhang, Dai, et al, 2013) or electrodeposition Shi et al, 2011;Sreekanth & Rameshbabu, 2012;Wu et al, 2010;Zhang, Dai, et al, 2012), calcium orthophosphate coatings might be deposited over the microarc oxidative coatings (Figures 7.12 and 7.13). Namely, MgeZneCa alloys coated with such composite coatings were found to induce rapid precipitation of calcium orthophosphates from simulated solutions, with simultaneous increasing of the corrosion resistance of Mg and its alloys .…”