热处理工艺对电弧增材制造ZL114A铝合金耐蚀性能的影响  

Effect of heat treatment on corrosion resistance of ZL114A aluminum alloy fabricated by wire-arc additive manufacturing

作　　者：张艳[1] 沈志胤 张熠琨 ZHANG Yan;SHEN Zhi-yin;ZHANG Yi-kun(School of Environmental and Chemical Engineering,Shenyang University of Technology,Shenyang 110870,China)

机构地区：[1]沈阳工业大学环境与化学工程学院,沈阳110870

出　　处：《沈阳工业大学学报》2023年第4期403-410,共8页Journal of Shenyang University of Technology

基　　金：国家自然科学基金项目(51171199).

摘　　要：为了研究热处理工艺对电弧增材制造ZL114A铝合金耐蚀行为的影响,采用光学显微镜和附带能谱仪的扫描电子显微镜分析了第二相的形貌及成分,并采用电化学工作站测试了铝合金的腐蚀行为.结果表明:经过固溶和时效处理后,ZL114A铝合金的组织主要由α-(Al)基体、共晶Si和Mg 2Si相组成.当在540℃固溶处理时,随着固溶时间从2 h增加到14 h,合金中共晶硅相逐渐转变为球状.经过14 h的固溶处理后,合金表现出很强的钝化能力.合金经过时效处理后,随着时效时间从4 h增加到12 h,晶内析出的共晶硅和Mg 2Si相数量逐渐增多,合金耐蚀性能降低.In order to investigate the effect of heat treatment on the corrosion resistance of ZL114A aluminum alloy fabricated by wire-arc additive manufacturing(WAAM),the morphologies and chemical composition of second phases were analyzed by an optical microscope and a scanning electron microscope with energy dispersive spectrometer.The corrosion behavior was tested by an electrochemical test system.The results show that the microstructures of ZL114A aluminum alloy are mainly composed ofα-(Al)matrix,eutectic Si and Mg 2Si phases after the solution and aging treatment.The morphologies of eutectic silicon phase gradually change to be spherical with the time increasing from 2 h to 14 h at 540℃for solution treatment.The ZL114A alloy shows strong passivation ability after the solution treatment for 14 h.The amounts of eutectic silicon and Mg 2Si phase precipitated within grains gradually increase and the corrosion resistance of aluminum alloy decreases with the aging time changing from 4 h to 12 h.

关 键 词：电弧增材制造 ZL114A铝合金 热处理 第二相 耐蚀性能 固溶时间 共晶硅相 钝化能力 

分 类 号：TG178[金属学及工艺—金属表面处理]