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| Material and method | Findings |
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| Calcium addition to AZ91Ca (1 wt%) and AZ61 (0.4 wt%) alloys [81] | The high amount of Ca in the alloy enhanced the formation of calcium phosphate on the surface and improved corrosion resistance; there was only a slight decrease in mechanical property of the alloy in SBF as compared to that of in air |
| Mg-Mn and Mg-Mn-Zn alloys [82] | Addition of Mn and Zn elements accelerated the formation of Mg-containing phosphate and provided better protection for matrix alloy; Zn-containing phosphate layer provided an effective protection to the alloy |
| Alkaline heat treatment on Mg-Ca alloy [83] | Corrosion rates of treated alloy in SBF were decreased; the treated alloy samples did not induce toxicity to L-929 cells during 7 days of culture |
| MgF2 coating on extruded LAE442 alloy [84] | Extruded LAE442 alloy provided low corrosion rates and reacts in vivo with an acceptable host response; localized corrosion attack was observed in both coated and uncoated LAE442 implants |
| Hydroxyapatite coating on AZ91 alloy [85] | The coated alloy showed 20% improvement in the mechanical strength as compared to that of the uncoated one; 40% loss in the mechanical strength after 5 days of exposure to SBF was measured for the uncoated alloy |
| Hydroxyapatite coating with MgF2 interlayer on pure Mg [86] | Coated Mg corroded less than bare Mg and showed an effective protection from in vivo corrosion; coated Mg had a higher bone-to-implant contact ratio in the cortical bone area of the rabbit femora 4 weeks after implantation |
| Phosphating treatment to form brushite layer on extruded Mg-Mn-Zn alloy [81, 87] | Electrochemical and immersion tests showed that the brushite (CaHPO4·2H2O) coating provided a good protection against corrosion in SBF; corrosion resistance increased with the increase of the phosphating time within 50 min |
| Chitosan coating on Mg-1Ca alloy [88] | Corrosion resistance of the coated alloy in SBF was improved |
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