5083铝合金成分优化及耐腐蚀性能研究

采用正交试验设计了不同成分的5083铝合金。运用晶间腐蚀、剥落腐蚀、极化曲线测试等研究手段,采用金相光学显微镜(OM)、扫描电子显微镜(SEM)、能谱分析(EDS)等方法,分析了Mn、Zn、Mg、Si等元素对5083铝合金耐腐蚀性能的影响,得出各元素在5083铝合金中的最佳成分范围。结果表明,Mn含量控制在0.5%左右,Si含量不应超过0.2%,Zn含量控制在0.14%左右,Mg含量控制在4.3%左右,其余元素在限度范围内时,5083铝合金的耐腐蚀性能较好。

Study on Composition Optimization and Corrosion Resistance of 5083 Aluminum Alloy

5083 aluminum alloy has excellent corrosion resistance and welding performance, and is widely used in marine engineering, but it is still corroded by various factors in the ocean.The alloy with different composition is designed by orthogonal design method.Intergranular corrosion,exfoliation corrosion,and polarization curve were tested.Using Metallographic microscope,scanning electron microscope, and energy dispersive spectrometer to analysis the effects of Mn,Zn,Mg and Si on the corrosion resistance of 5083 aluminum alloy.And the optimun composition range of each element in 5083 aluminum alloy was obtained. The results show that the Mn content is about 0.5 wt.%,the Si content is less than 0.2 wt.% , the Zn content is about 0.14 wt.% ,the Mg content is about 4.3 wt.%,and remain elements within the composition range,the corrosion resistance of 5083 aluminum alloy is better.