Effect of Ho Content and Heat Treatment on the Corrosion Resistance of Mg-xHo-3Sm-0.5Zr Alloy
Tóm tắt
The corrosion resistance of as-cast Mg-xHo-3Sm-0.5Zr, solid solution and aged Mg-8Ho-3Sm-0.5Zr alloys was studied by electrochemical experiments, weight loss tests and microstructure analysis. The results showed that adding a proper amount of Ho to the as-cast alloy can refine the grain size. Furthermore, Ho can promote the precipitation of the Mg41Sm5 phase and form a new Mg24Ho5 phase. The Mg-8Ho-3Sm-0.5Zr alloy has the strongest corrosion resistance because of its uniform structure and the smallest grain size. Then, the Mg-8Ho-3Sm-0.5Zr alloy was heat treated. The results indicate that after solution treatment, the microstructure of the alloy is uniformly dispersed, and the second phase is dissolved in α-Mg, which improves the self-corrosion potential of the matrix. Its corrosion resistance is slightly better than that of the as-cast alloys. After aging treatment, a large number of second phases are uniformly dispersed to form a corrosion barrier, which further reduces the corrosion rate.
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