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研究304不锈钢、321不锈钢、Ti6Al4V合金和Ni板等相变储热容器壳体候选材料与Al-4%Cu-12%Mg-7%Si合金的相容性,实验温度为650℃历时360 h。结果表明Ti6Al4V合金的腐蚀失重最少,不锈钢次之,Ni板在液态铝合金中发生溶解反应,失重最大。采用扫描电镜观察腐蚀后各合金组织的变化,结果表明,在Ti6Al4V合金和液态铝合金的界面发生Ti的富集,限制了互扩散层的进一步生长;不锈钢与液态铝合金界面呈现Ni的贫化和Cr的富集;Ni板在Ni-Al合金溶液界面生成Ni-Al合金化合物并融入到铝合金中,因此,Ni最不耐熔融Al合金的侵蚀。
The compatibility of candidate material of phase change heat storage container shell 304 with Al-4% Cu-12% Mg-7% Si alloy was studied at 304 stainless steel, 321 stainless steel, Ti6Al4V alloy and Ni plate. . The results show that Ti6Al4V alloy has the least corrosion weight loss, followed by stainless steel. Ni plate dissolves in liquid aluminum alloy and has the largest weight loss. Scanning electron microscope (SEM) was used to observe the changes of the microstructures after corrosion. The results show that Ti enrichment at the interface of Ti6Al4V alloy and liquid aluminum alloy limits the further growth of interdiffusion layer. The interface between stainless steel and liquid aluminum alloy shows the depletion of Ni And Cr enrichment; Ni plate in the Ni-Al alloy solution interface generated Ni-Al alloy compound and into the aluminum alloy, therefore, Ni is the most resistant to erosion of molten Al alloy.