|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Surface Engineering for Improved Corrosion Resistance
||Corrosion Behavior of Microarc Oxidized Mg Alloy in Simulated Body Fluid
||Junqing Zhang, Lei Zhang, Benjamin M. Wilke, Weiping Li, Chengyun Ning, Tonoy Chowdhury
|On-Site Speaker (Planned)
Microarc oxidation (MAO) coatings were deposited on AZ31 Mg alloy at different pulse frequencies. Samples were immersed in Earle’s Balance Salt Solution (EBSS) up to 21 days. SEM, EIS, and XRD were performed to evaluate the corrosion behavior of MAO coatings in EBSS as compared to uncoated AZ31. MAO-coated samples demonstrated improved corrosion resistance compared to the bare AZ31, indicating that MAO coating exhibited good corrosion protection of AZ31 in EBSS. Given the same immersion time, MAO-coated samples showed decreased corrosion current density and increased electrochemical impedance with increasing the pulse frequency. The coating produced at 3000 Hz exhibited the best corrosion resistance compared to the ones produced at 300, 500, and 1000 Hz due to its uniform and dense structure. XRD analysis showed that the corrosion products of the MAO-coated samples after immersion into the EBSS for 21 days were primarily composed of Mg(OH)2, Mg4Al2(CO3)(OH)12·3H2O, and hydroxyapatite.
||Planned: Supplemental Proceedings volume