Enhancement of corrosion resistance of Mg-9 wt.% Al-1 wt.% Zn alloy by a calcite (CaCO3) conversion hard coating |
| |
Authors: | BL Yu |
| |
Affiliation: | Department of Materials Science and Engineering, National Chung Hsing University, 250 Kuo-Kuang Rd., Taichung 402, Taiwan, ROC |
| |
Abstract: | A calcite (CaCO3) coating on Mg alloy, formed by chemical conversion treatment, was investigated. Aqueous with Ca2+ concentration of ∼220 ppm was employed in the chemical conversion treatment. Cross-sectional microstructures of the coated sample after 2 h of treatment revealed a two-layer coating structure. The corrosion current density (Icorr) of the coated sample was approximately two orders of magnitude lower than that of the untreated sample. Electrochemical impedance spectroscopy (EIS) and an appropriate equivalent circuit suggested that each of the layers of the two-layer coating effectively protects Mg alloy against corrosion. |
| |
Keywords: | A Magnesium Conversion coating B EIS Corrosion |
本文献已被 ScienceDirect 等数据库收录! |
|