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Title
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The Yttrium-Incorporated Aluminizing of Mg-3%Al Alloy for Improved Tribological and Corrosion Properties
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Type
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JournalPaper
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Keywords
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aluminizing, corrosion, magnesium, rare earth, wear, yttrium
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Abstract
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Modification of the surface is an effective approach for increasing the corrosion resistance of Mg alloys without influencing their bulk properties. Among numerous surface modification techniques, aluminizing is a low-cost and effective approach that is applied on many alloys for improved resistance to wear and corrosion. Based on the previous research, the enhancement by aluminizing can be further increased by the addition of rare-earth elements such as Y. In the current work, the effect of the addition of yttrium to the aluminizing mixture on the corrosion and tribological behavior of Mg-3%Al alloy was studied. Ball-on-disk tribometer and electrochemical testing apparatus were used to test wear and corrosion behavior and scanning electron microscopy was utilized to study the microstructures and worn surfaces. The results demonstrated that the aluminizing process is beneficial to the resistance of the alloy to wear, corrosion, and corrosive wear. The addition of Y makes the benefits larger. By adding Y, the wear volume loss decreased from 5.63107 to 3.53107 lm3 and the corrosive wear volume loss decreased from 4.13106 to 3.53106 lm3. In addition, incorporating Y in the aluminizing mixture resulted in a decrease in corrosion current from 4.59310-2 to 6.17310-3 lA. The improved properties are mainly attributed to the improved passivation capability of the modified surface layer.
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Researchers
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Dongyang Li (Second Researcher), Meisam Nouri (First Researcher)
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