Effect of Ca Addition on Corrosion Behavior of Wrought AM60 Magnesium Alloy in Alkaline Solutions

Magnesium (Mg) alloys possess the lowest density among structural materials, and their application in automotive aircraft industries might enhance fuel efficiency. The mechanical properties can be improved by addition of alloying elements. However, since Mg its are very susceptible to corrosion degradation, it is important study effect these elements on alloys’ behavior. In this study, 1 wt% calcium (Ca) was added wrought AM60 alloy, electrochemical behavior alkaline solutions with without Cl? ions compared. investigated means immersion tests, gravimetric measurements potentiodynamic polarization (PDP); characteristics oxide layer were studied impedance spectroscopy (EIS) X-ray photoelectron (XPS). Ca resulted precipitation ternary aluminum-rich (Mg-Al)2Ca phase. Scanning Kelvin probe force microscope (SKPFM) identified that phase has a cathodic relative ?-Mg matrix; hence serve as additional sites for initiation pitting corrosion. As result, resistance alloy deteriorated NaCl solution. absence ions, improves due stabilization products layer. long-period time oxidation discussed.