title: Rapid coating of AZ31 magnesium alloy with calcium deficient hydroxyapatite using microwave energy.
abstract: Due to their unique biodegradability, magnesium alloys have been recognized as suitable metallic implant materials for degradable bone implants and bioresorbable cardiovascular stents. However, the extremely high degradation rate of magnesium alloys in physiological environment has restricted its practical application. This paper reports the use of a novel microwave assisted coating technology to improve the in vitro corrosion resistance and biocompatibility of Mg alloy AZ31. Results indicate that a dense calcium deficient hydroxyapatite (CDHA) layer was uniformly coated on a AZ31 substrate in less than 10min. Weight loss measurement and SEM were used to evaluate corrosion behaviors in vitro of coated samples and of non-coated samples. It was seen that CDHA coatings remarkably reduced the mass loss of AZ31 alloy after 7days of immersion in SBF. In addition, the prompt precipitation of bone-like apatite layer on the sample surface during immersion demonstrated a good bioactivity of the CDHA coatings. Proliferation of osteoblast cells was promoted in 5days of incubation, which indicated that the CDHA coatings could improve the cytocompatibility of the AZ31 alloy. All the results suggest that the CDHA coatings, serving as a protective layer, can enhance the corrosion resistance and biological response of magnesium alloys. Furthermore, this microwave assisted coating technology could be a promising method for rapid surface modification of biomedical materials.
authors: Department of Mechanical, Industrial and Manufacturing Engineering, The University of Toledo, Toledo, OH, USA. Electronic address: Yufu.Ren@rockets.utoledo.edu.
authors: Yufu
authors: Y
authors: Ren
authors: Department of Mechanical, Industrial and Manufacturing Engineering, The University of Toledo, Toledo, OH, USA; Institute of Biomedical Engineering and Health Sciences, Changzhou University, Changzhou, Jiangsu, China.
authors: Huan
authors: H
authors: Zhou
authors: Department of Bioengineering, The University of Toledo, Toledo, OH, USA.
authors: Maryam
authors: M
authors: Nabiyouni
authors: Department of Mechanical, Industrial and Manufacturing Engineering, The University of Toledo, Toledo, OH, USA; Division of Dentistry, The University of Toledo, Toledo, OH, USA.
authors: Sarit B
authors: SB
authors: Bhaduri
mesh_terms: D000497:Alloys; D002118:Calcium; D020099:Coated Materials, Biocompatible; D017886:Durapatite; D008855:Microscopy, Electron, Scanning; D008872:Microwaves; D017550:Spectroscopy, Fourier Transform Infrared; D014961:X-Ray Diffraction
chemical_list: D000497:Alloys; D020099:Coated Materials, Biocompatible; C586533:Mg-Al-Zn-Mn-Si-Cu alloy; D017886:Durapatite; D002118:Calcium
keywords: AZ31 magnesium alloy; Biocompatible coating; Calcium deficient hydroxyapatite coating; Microwave