合金化对Al-Si压铸铝合金的组织与性能影响的研究
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摘要
采用正交实验,研究了Si、Ti、Mn三种元素对金属型铸造A380合金组织和耐腐蚀性能的影响,并优化得到了组织和性能最佳的合金成分。采用全浸实验测试了优化合金与A380合金的腐蚀速率,在光学显微镜和带有能谱仪的扫描电镜下研究了两种合金腐蚀前后的组织和腐蚀产物,结合电化学极化曲线分析了新型合金的腐蚀机理。结果表明,A380合金的耐腐蚀性能影响因素为Si>Ti>Mn;优化合金基体上腐蚀斑点比A380合金的明显减少,而且基体表面生成了保护性氧化物层,耐腐蚀性能更佳,且其综合力学性能也更优异。
Orthogonal test was used to study the influence of Si, Ti and Mn elements on the microstructure and corrosion resistance of permanent mold casting A380 alloy, and an optimized alloy composition corresponding to better microstructure and corrosion resistance was obtained. The corrosion rate of the optimal alloy and A380 alloy was tested by using a full immersion test. The microstructure and corrosion products of the two alloys before and after corrosion were studied by optical microscopy and scanning electron microscopy equipped with an energy dispersive spectrometer. The corrosion mechanism of the new alloy were analyzed by combining with electrochemical polarization curves. The results show that the order of influence on the corrosion resistance of A380 alloy is Si>Ti>Mn. The corrosion spots on the optimized alloy matrix are less compared with those on A380 alloy, and the corrosion resistance is better due to the formation of a protective oxide layer on the surface of the substrate, and its comprehensive mechanical property is superior.
Orthogonal test was used to study the influence of Si, Ti and Mn elements on the microstructure and corrosion resistance of permanent mold casting A380 alloy, and an optimized alloy composition corresponding to better microstructure and corrosion resistance was obtained. The corrosion rate of the optimal alloy and A380 alloy was tested by using a full immersion test. The microstructure and corrosion products of the two alloys before and after corrosion were studied by optical microscopy and scanning electron microscopy equipped with an energy dispersive spectrometer. The corrosion mechanism of the new alloy were analyzed by combining with electrochemical polarization curves. The results show that the order of influence on the corrosion resistance of A380 alloy is Si>Ti>Mn. The corrosion spots on the optimized alloy matrix are less compared with those on A380 alloy, and the corrosion resistance is better due to the formation of a protective oxide layer on the surface of the substrate, and its comprehensive mechanical property is superior.
引文
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[11]刘涛,苏光.Mn对A356铝合金铁相形貌组织和力学性能的影响[J].铸造,2014,63(7):647-650.
[12]黄大贺,梁新理,刘文凤,等.Fe含量对过共晶铝硅合金组织及流动性的影响[J].科技与创新,2016(21):11-12.
[2]冯正海,李念奎.新型Al-Mg-Cu铝合金铸锭均匀化过程中相的变化[J].轻合金加工技术,2009,37(9):29-33.
[3]李世伟,高波,涂赣峰,等.Cu和La对Al-12.6Si合金微观组织和性能的影响[J].东北大学学报(自然科学版),2012,33(11):86-89.
[4]左秀荣,李立祥,仲志国.Ti、B、Sr、RE联合细化及变质对A356铝合金微观组织的影响[J].铸造技术,2007,28(1):57-59.
[5]廖恒成,孙瑜,孙国雄,等.Al-5%Ti-1%B对Sr变质Al-13.0%Si合金组织影响的研究[J].铸造,2000,49(5):251-256.
[6]廖恒成,丁毅,孙国雄.Sr对Al-Si-Mg铸造合金中Mg2Si相结晶行为影响的研究[J].铸造,2002,51(2):80-84.
[7] Gao T, Zhu X, Sun Q, Liu X.Morphological evolution of Zr AlSi phase and its impact on the elevated-temperature properties of Al-Si piston alloy[J].Journal of Alloys and Compounds,2013,567:82-88.
[8]吴亮,金青林,蒋业华,等.Mn、Sr对铝硅合金中铁相的影响[J].铸造,2011,60(12):1185-1189.
[9]惠林海,耿浩然,王守仁,等.Al3Ti金属间化合物的研究进展[J].机械工程材料,2007,31(9):1-6.
[10]李世伟,高波,涂赣峰,等.Cu和La对Al-12.6Si合金微观组织和性能的影响[J].东北大学学报(自然科学版),2012,33(11):86-89.
[11]刘涛,苏光.Mn对A356铝合金铁相形貌组织和力学性能的影响[J].铸造,2014,63(7):647-650.
[12]黄大贺,梁新理,刘文凤,等.Fe含量对过共晶铝硅合金组织及流动性的影响[J].科技与创新,2016(21):11-12.