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Open AccessArticle

Evaluation of the Corrosion Resistance and Cytocompatibility of a Bioactive Micro-Arc Oxidation Coating on AZ31 Mg Alloy

1
Department of Chemistry and Materials Engineering, Chung Cheng Institute of Technology, National Defense University, Taoyuan 33591, Taiwan
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Department of Physiology, College of Medicine, Kaohsiung Medical University, Kaohsiung 80708, Taiwan
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Orthopaedic Research Center, Kaohsiung Medical University, Kaohsiung 80708, Taiwan
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Department of Marine Biotechnology and Resources, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
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Department of Medical Research, Kaohsiung Medical University Hospital, Kaohsiung 80708, Taiwan
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Department of Mechanical Engineering and Graduate Institute of Mechanical and Precision Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung 80778, Taiwan
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Combination Medical Device Technology Division, Medical Devices Department, Metal Industries Research & Development Centre, Kaohsiung 81160, Taiwan
*
Authors to whom correspondence should be addressed.
Coatings 2019, 9(6), 396; https://doi.org/10.3390/coatings9060396
Received: 13 May 2019 / Revised: 13 June 2019 / Accepted: 14 June 2019 / Published: 20 June 2019
(This article belongs to the Special Issue Plasma Electrolytic Oxidation (PEO) Coatings)
Magnesium alloys have recently been attracting attention as a degradable biomaterial. They have advantages including non-toxicity, biocompatibility, and biodegradability. To develop magnesium alloys into biodegradable medical materials, previous research has quantitatively analyzed magnesium alloy corrosion by focusing on the overall changes in the alloy. Therefore, the objective of this study is to develop a bioactive material by applying a ceramic oxide coating (magnesia) on AZ31 magnesium alloy through micro-arc oxidation (MAO) process. This MAO process is conducted under pulsed bipolar constant current conditions in a Si- and P-containing electrolyte and the optimal processing parameters in corrosion protection are obtained by the Taguchi method to design a coating with good anti-corrosion performance. The negative duty cycle and treatment time are two deciding factors of the coating’s capability in corrosion protection. Microstructure characterizations are investigated by means of SEM and XRD. The simulation body-fluid solution is utilized for testing the corrosion resistance with the potentiodynamic polarization and the electrochemical impedance test data. Finally, an in vivo testing shows that the MAO-coated AZ31 has good cytocompatibility and anticorrosive properties. View Full-Text
Keywords: magnesium alloy; micro-arc oxidation; Taguchi method; SBF; in-vivo test; biodegradability magnesium alloy; micro-arc oxidation; Taguchi method; SBF; in-vivo test; biodegradability
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MDPI and ACS Style

Jian, S.-Y.; Ho, M.-L.; Shih, B.-C.; Wang, Y.-J.; Weng, L.-W.; Wang, M.-W.; Tseng, C.-C. Evaluation of the Corrosion Resistance and Cytocompatibility of a Bioactive Micro-Arc Oxidation Coating on AZ31 Mg Alloy. Coatings 2019, 9, 396. https://doi.org/10.3390/coatings9060396

AMA Style

Jian S-Y, Ho M-L, Shih B-C, Wang Y-J, Weng L-W, Wang M-W, Tseng C-C. Evaluation of the Corrosion Resistance and Cytocompatibility of a Bioactive Micro-Arc Oxidation Coating on AZ31 Mg Alloy. Coatings. 2019; 9(6):396. https://doi.org/10.3390/coatings9060396

Chicago/Turabian Style

Jian, Shun-Yi; Ho, Mei-Ling; Shih, Bing-Ci; Wang, Yue-Jun; Weng, Li-Wen; Wang, Min-Wen; Tseng, Chun-Chieh. 2019. "Evaluation of the Corrosion Resistance and Cytocompatibility of a Bioactive Micro-Arc Oxidation Coating on AZ31 Mg Alloy" Coatings 9, no. 6: 396. https://doi.org/10.3390/coatings9060396

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