Improving the bioactivity and corrosion resistance properties of electrodeposited hydroxyapatite coating by dual doping of bivalent strontium and manganese ion

• Published in: Surface & coatings technology Vol. 291; pp. 205 - 215
• Main Authors: Huang, Yong, Qiao, Haixia, Nian, Xiaofeng, Zhang, Xuejiao, Zhang, Xiaoyun, Song, Guiqin, Xu, Zhiwei, Zhang, Honglei, Han, Shuguang
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.04.2016
• Subjects: Biocompatibility; Biomaterials; Biomedical materials; Coating; Corrosion resistance; Hydroxyapatite; Hydroxyapatite coating; Manganese; Strontium; Surgical implants; Strontium; Corrosion resistance; Biocompatibility; Hydroxyapatite coating; Manganese
• ISSN: 0257-8972; 1879-3347
• DOI: 10.1016/j.surfcoat.2016.02.042

The key property in the preparation of a biomaterial is to facilitate the regeneration and/or replacement of injured organs and tissues. To obtain such a biomaterial, strontium and manganese co-substituted hydroxyapatite (SrMnHA) ceramic coatings on commercially pure titanium (CP-Ti) were successfully prepared by a cathodic electrodeposition method. The formation of SrMnHA coating was investigated using Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, energy dispersive X-ray analysis and inductively coupled plasma. Co-doping of Sr2+ and Mn2+ ions decreased hydroxyapatite unit cell volume and grain sizes. Obtained coatings were crack-free and dense, which led to the decrease in the corrosion current densities of CP-Ti in physiological solutions. The dissolution tests performed on SrMnHA resulted in the leaching of Sr2+ and Mn2+ at low levels. SrMnHAs have moderately hydrophilic surfaces with a contact angle of 23.8°. Additionally, the MC3T3-E1 cells show better cell morphology, adhesion, spreading, proliferation and expression of alkaline phosphatase on SrMnHA than on HA. The excellent biocompatibility of SrMnHA is mainly attributed to a probable effect of a combination of good surface wettability and ion release (Sr2+ and Mn2+). Results suggest that SrMnHA composite-coated CP-Ti can be a potential candidate for orthopaedic applications. •We developed a SrMnHA-coated Ti implant by using an ED method.•Obtained SrMnHA coatings were crack-free and dense.•The SrMnHA coating possessed an excellent corrosion protection ability.•The composite coated CP-Ti possesses favourable cytocompatibility.