Effects of Alloying Element Ca on the Corrosion Behavior and Bioactivity of Anodic Films Formed on AM60 Mg Alloys

Anawati Anawati; Hidetaka Asoh; Sachiko Ono

doi:10.3390/ma10010011

Effects of Alloying Element Ca on the Corrosion Behavior and Bioactivity of Anodic Films Formed on AM60 Mg Alloys

Materials (Basel). 2016 Dec 26;10(1):11. doi: 10.3390/ma10010011.

Authors

Anawati Anawati^{1

2}, Hidetaka Asoh^{3

4}, Sachiko Ono^{5

6}

Affiliations

¹ Research Institute for Science and Technology, Kogakuin University, 2665-1 Nakano, Hachioji, Tokyo 192-0015, Japan. anawati04@ui.ac.id.
² Department of Physics, Faculty of Mathematics and Natural Sciences, University of Indonesia, Depok 16424, Indonesia. anawati04@ui.ac.id.
³ Research Institute for Science and Technology, Kogakuin University, 2665-1 Nakano, Hachioji, Tokyo 192-0015, Japan. asoh@cc.kogakuin.ac.jp.
⁴ Department of Applied Chemistry, Kogakuin University, 2665-1 Nakano, Hachioji, Tokyo 192-0015, Japan. asoh@cc.kogakuin.ac.jp.
⁵ Research Institute for Science and Technology, Kogakuin University, 2665-1 Nakano, Hachioji, Tokyo 192-0015, Japan. sachiono@cc.kogakuin.ac.jp.
⁶ Department of Applied Chemistry, Kogakuin University, 2665-1 Nakano, Hachioji, Tokyo 192-0015, Japan. sachiono@cc.kogakuin.ac.jp.

Abstract

Effects of alloying element Ca on the corrosion behavior and bioactivity of films formed by plasma electrolytic oxidation (PEO) on AM60 alloys were investigated. The corrosion behavior was studied by conducting electrochemical tests in 0.9% NaCl solution while the bioactivity was evaluated by soaking the specimens in simulated body fluid (SBF). Under identical anodization conditions, the PEO film thicknesses increased with increasing Ca content in the alloys, which enhanced the corrosion resistance in NaCl solution. Thicker apatite layers grew on the PEO films of Ca-containing alloys because Ca was incorporated into the PEO film and because Ca was present in the alloys. Improvement of corrosion resistance and bioactivity of the PEO-coated AM60 by alloying with Ca may be beneficial for biodegradable implant applications.

Keywords: anodic films; biodegradable; corrosion; magnesium alloy; polarization.