Insights into the Corrosion Behavior of Pure Magnesium and Magnesium–Calcium Alloy (Mg-1.8 at.% Ca) in Thin-Film and Bulk Forms
Hüseyin Zengin, Andrei Ionut Mardare, Andreas Greul, Manuel Hofinger, Gianina Popescu-Pelin, Gabriel Socol, Achim Walter Hassel
TL;DR
This study compares the corrosion behavior of pure magnesium and a magnesium-calcium alloy in bulk and thin-film forms, showing that thin-film Mg-1.8Ca has better corrosion resistance due to its microstructure.
Contribution
The study reveals that thin-film Mg-1.8Ca alloy exhibits superior corrosion resistance due to its single-phase microstructure and stable surface film.
Findings
Bulk Mg-1.8Ca alloy forms a Mg2Ca intermetallic phase, while thin-film Mg-1.8Ca remains single-phase.
Thin-film Mg-1.8Ca shows significantly better corrosion resistance than its bulk counterpart.
Microstructural control through manufacturing techniques can enhance the performance of Mg alloys.
Abstract
This study investigates the microstructural and corrosion properties of pure magnesium (Mg) and Mg-1.8Ca (at.%) alloy in both bulk and thin-film forms. Microstructure investigations showed that the addition of calcium (Ca) to Mg resulted in significant differences in microstructures. The bulk pure Mg exhibited coarse and elongated α-Mg grains, which were refined by Ca addition, together with the formation of a Mg2Ca intermetallic phase distributed throughout the microstructure. In contrast, thin-film Mg-1.8Ca alloys displayed a refined single-phase microstructure with uniform nm-scale grains and no intermetallic formation. The electrochemical corrosion tests revealed that the bulk and thin-film pure Mg exhibited comparable corrosion rates, while a substantial difference between the corrosion resistance of bulk and thin-film Mg-1.8Ca (at.%) alloy was observed. The thin-film Mg-1.8Ca…
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Taxonomy
TopicsMagnesium Alloys: Properties and Applications · Aluminum Alloys Composites Properties · Corrosion Behavior and Inhibition