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• Hydroxyapatite/graphene oxide (HA/GO#) bilayer coating is prepared on AZ31 alloy via hydrothermal treatment and spin coating. • The presence of GO can effectively inhibit the formation and growth of cracks on HA layer. • HA/GO# coating shows enhanced corrosion resistance and biocompatibility. Fast degradation is the major limitation for biomedical application of Mg alloy. In the current work, a bilayer coating (HA/GO#) with hydroxyapatite as the inner layer and graphene oxide as the out layer was prepared on AZ31 alloy. Graphene oxide could sufficiently inhibit the formation and growth of corrosion cracks on hydroxyapatite layer, which result in its superior corrosion resistance. In vitro cell viability results suggested that MC3T3-E1 cells exhibited larger spreading area on HA/GO# coating at the initial 4 h of incubation. Furthermore, cells on HA/GO# coating showed superior proliferation rate. Considering its satisfied corrosion resistance and biocompatibility, the as prepared bilayer coating on AZ31 alloy is promising for clinical application. [ABSTRACT FROM AUTHOR]

• A self-healing coating was prepared on a magnesium surface using a simple deposition method. • The prepared coating exhibited excellent corrosion resistance and self-healing ability. • The prepared coating demonstrated good biocompatibility. To improve the corrosion resistance and biocompatibility of magnesium (Mg) for biomedical applications, a novel coating comprising self-healing dicalcium phosphate dihydrate (DCPD) was applied to Mg using a simple deposition method, without the need for the addition of corrosion inhibitors. Scratch and immersion tests demonstrated that the prepared coating displayed impressive self-healing capabilities, with artificial scratches within 4 h when exposed to 0.9 wt% NaCl solution. The electrochemical test suggested that the DCPD-coating, whether scratched or not, provided effective corrosion protection for the Mg substrate. In vitro cell culture results revealed that the DCPD-coated samples exhibited superior biocompatibility compared to pure Mg. This work offers a new perspective on designing self-healing coatings for Mg, eliminating the need for additional corrosion inhibitors. [ABSTRACT FROM AUTHOR]

• Ti coatings are prepared on pure Zn via magnetron sputtering technology. • The presence of Ti coatings can effectively inhibit the release of Zn ions from the substrate. • The Ti-coated Zn show enhanced corrosion resistance and biocompatibility. Recently, Zn and its alloys are hotspots in biodegradable implants for their desirable degradation rate. In this study, Ti coatings are deposited on Zn by magnetron sputtering to enhance its corrosion resistance and biocompatibility. The surface morphology and chemical compositions of the coatings are studied by SEM, XRD, and XPS. Though obvious Ti elements are detected on the surface of the coatings, the surface views do not change after deposited with Ti. Potentiodynamic polarization, Zn ion release, and corrosion morphology observations suggest that Ti coatings can improve the corrosion resistance of Zn. The cells cultured in the extracts of Ti-coated samples exhibit higher viability than those cultured in the extract of Zn. With enhanced corrosion resistance and cytocompatibility, Ti-coated Zn is believed to be a candidate coating for implant application. [ABSTRACT FROM AUTHOR]