Study of Corrosion Behavior of Mg–Gd-Based Soluble Magnesium Alloys
The corrosion behavior of soluble Mg–Gd-based alloys was systematically investigated by analyzing two key aspects: environmental factors and microstructural characteristics. Environmental influences were evaluated using immersion weight loss tests under varying Cl<sup>−</sup> concentrati...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-01-01
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| Series: | Metals |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2075-4701/15/1/35 |
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| Summary: | The corrosion behavior of soluble Mg–Gd-based alloys was systematically investigated by analyzing two key aspects: environmental factors and microstructural characteristics. Environmental influences were evaluated using immersion weight loss tests under varying Cl<sup>−</sup> concentrations and temperature conditions. From a microstructural perspective, the study examined the impact of different initial microstructural morphologies on corrosion performance. The second-phase compound Mg<sub>5</sub>Gd, formed in alloys prepared via melting, was subjected to both immersion weight loss and electrochemical testing. The results demonstrated that corrosion rates increased with higher Cl<sup>−</sup> concentrations and elevated temperatures, albeit in a nonlinear manner. Notably, significant effects on corrosion rates were observed in the Cl<sup>−</sup>concentration range of 1% to 3% and at temperatures between 75 °C and 100 °C. Additionally, the dissolution rate of the alloy increased markedly from 8.37 mg/cm<sup>2</sup>/h in the as-cast state to 43.85 mg/cm<sup>2</sup>/h following extrusion combined with perforation deformation. Microstructural analysis revealed that the extrusion process disrupted the coarse, reticulated second-phase structure observed in the as-cast state, thereby diminishing its corrosion-inhibiting properties. Electrochemical testing further confirmed that the Mg<sub>5</sub>Gd second phase, formed through the incorporation of the rare-earth element Gd, exhibited high electrochemical activity. |
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| ISSN: | 2075-4701 |