STUDY ON THE ELECTROCHEMICAL CORROSION BEHAVIOR OF Mg-xSn-0.6Ca (x = 1, 2, 6, 7) ALLOYS
Abstract
This study systematically investigated the effects of different Sn contents on the microstructure and electrochemical corrosion behavior of Mg-xSn-0.6Ca (x = 1, 2, 6, 7) alloys. The corrosion behavior of the alloys in a 3.5 w/% NaCl solution was evaluated using hydrogen evolution weight loss analysis, potentiodynamic polarization curve analysis, and electrochemical impedance spectroscopy (EIS). The results indicate that as the Sn content increases, the quantity and size of the Mg2Sn and CaMgSn secondary phases in the alloys significantly increase, effectively hindering the diffusion of corrosive media, thereby enhancing the corrosion resistance of the alloys. When the Sn content is 6 %, the Mg-6Sn-0.6Ca alloy exhibits the best corrosion resistance. Electrochemical test results show that the Mg-6Sn-0.6Ca alloy has the lowest self-corrosion current density. Additionally, scanning electron microscope (SEM) and energy dispersive spectrometer (EDS) analyses reveal that the synergistic effect of Sn and Ca elements significantly improves the corrosion resistance of the alloy. However, an excessive Sn content (e.g., 7 %) may lead to localized micro-galvanic corrosion, reducing the corrosion resistance.
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