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Galfan合金中的稀土元素对合金的组织和耐蚀性有显著影响。实验研究了稀土元素Ce含量(质量分数)分别为0,0.05%,0.10%和0.20%的Zn-5%Al-x Ce合金在炉冷、空冷和水冷3种冷却条件下的凝固组织及其耐蚀性,进而分析稀土元素添加量和冷却方式对Galfan合金显微组织及耐蚀性的影响。结果表明,冷却条件和Ce含量对Zn-5%Al-x Ce合金的显微组织和耐蚀性有明显影响。随Ce含量的增加,Zn-5%Alx Ce合金的层片共晶组织分布均匀,杂质、裂纹等缺陷减少。Ce元素的加入显著改善了合金的凝固组织和耐蚀性,使合金的耐蚀性先增强后减弱。此外,合金的冷却速度越大,获得的组织越致密,且耐蚀性越好。Zn固溶体呈完整树枝状,棒状,胞枝状到胞状变化。研究认为,添加0.1%Ce的Galfan合金水冷后的耐蚀性最好。
The rare earth elements in Galfan alloy have a significant effect on the microstructure and corrosion resistance of the alloy. The solidification microstructure of Zn-5% Al-x Ce alloy with 0, 0.05%, 0.10% and 0.20% Ce of rare earth elements (mass fraction) under three cooling conditions of furnace cooling, air cooling and water cooling Corrosion resistance, and then analyze the rare earth element addition and cooling mode on Galfan alloy microstructure and corrosion resistance. The results show that the cooling conditions and the content of Ce significantly affect the microstructure and corrosion resistance of Zn-5% Al-x Ce alloy. With the increase of Ce content, the eutectic microstructure of Zn-5% Alx Ce alloy is uniform and the defects such as impurities and cracks are reduced. The addition of Ce significantly improves the solidified structure and corrosion resistance of the alloy, so the corrosion resistance of the alloy first increases and then decreases. In addition, the greater the cooling rate of the alloy, the denser the structure obtained and the better the corrosion resistance. Zn solid solution showed a complete dendritic, rod-shaped, cell dendritic to cellular changes. It is considered that Galfan alloy with 0.1% Ce is the best corrosion resistance after water cooling.