1(Al2CuLi)相數(shù)量增加,并且形成了明顯的晶界無(wú)沉淀帶(Precipitate Free Zone,PFZ)。焊態(tài)下接頭未出現(xiàn)晶間腐蝕,熱影響區(qū)和母材區(qū)均出現(xiàn)了孔蝕；焊后時(shí)效處理增大了接頭的晶間腐蝕傾向,熱影響區(qū)同時(shí)發(fā)生了孔蝕和晶間腐蝕,母材區(qū)出現(xiàn)了嚴(yán)重的晶間腐蝕。焊態(tài)下焊縫和熱影響區(qū)均具有優(yōu)異的抗剝蝕能力,母材區(qū)對(duì)剝蝕的敏感性較高；焊后時(shí)效處理可提高接頭母材區(qū)的抗剝蝕能力,但會(huì)增大熱影響區(qū)的剝蝕敏感性。電化學(xué)腐蝕測(cè)試表明,與時(shí)效后的接頭焊縫相比,焊態(tài)下焊縫的自腐蝕電位較高,腐蝕電流密度小,具有相對(duì)較好的耐蝕性。"/>

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時(shí)效處理對(duì)鋁鋰合金電子束焊接頭耐蝕性能的影響
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南京航空航天大學(xué)材料科學(xué)與技術(shù)學(xué)院,南京航空航天大學(xué)材料科學(xué)與技術(shù)學(xué)院,南京航空航天大學(xué)材料科學(xué)與技術(shù)學(xué)院

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TG456.3

基金項(xiàng)目:

航空科學(xué)基金資助項(xiàng)目(No. 2015ZE52048);江蘇高校優(yōu)勢(shì)學(xué)科建設(shè)工程資助項(xiàng)目


Effect of Aging Treatment on Corrosion Resistance of Al-Li Alloy Joint Welded by Electron Beam Welding
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College of Material Science and Technology,Nanjing University of Aeronautics and Astronautics,College of Material Science and Technology,Nanjing University of Aeronautics and Astronautics,College of Material Science and Technology,Nanjing University of Aeronautics and Astronautics

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Aeronautical Science Foundation of China(No. 2015ZE52048);A Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions

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    摘要:

    對(duì)鋁鋰合金電子束焊接頭進(jìn)行焊后熱處理,研究了時(shí)效處理前后接頭各區(qū)域的晶間腐蝕、剝蝕和電化學(xué)腐蝕行為。結(jié)果表明,接頭經(jīng)過(guò)時(shí)效處理后,焊縫晶界析出的T1(Al2CuLi)相數(shù)量增加,并且形成了明顯的晶界無(wú)沉淀帶(Precipitate Free Zone,PFZ)。焊態(tài)下接頭未出現(xiàn)晶間腐蝕,熱影響區(qū)和母材區(qū)均出現(xiàn)了孔蝕；焊后時(shí)效處理增大了接頭的晶間腐蝕傾向,熱影響區(qū)同時(shí)發(fā)生了孔蝕和晶間腐蝕,母材區(qū)出現(xiàn)了嚴(yán)重的晶間腐蝕。焊態(tài)下焊縫和熱影響區(qū)均具有優(yōu)異的抗剝蝕能力,母材區(qū)對(duì)剝蝕的敏感性較高；焊后時(shí)效處理可提高接頭母材區(qū)的抗剝蝕能力,但會(huì)增大熱影響區(qū)的剝蝕敏感性。電化學(xué)腐蝕測(cè)試表明,與時(shí)效后的接頭焊縫相比,焊態(tài)下焊縫的自腐蝕電位較高,腐蝕電流密度小,具有相對(duì)較好的耐蝕性。

    Abstract:

    The post-weld heat treatment(PWHT) is carried out to Al-Li alloy joints welded by electron beam welding(EBW), and the behaviour of intergranular corrosion(IGC), exfoliation corrosion(EXCO) and electrochemical corrosion of different zones of welded joint before and after PWHT are investigated. Results show that the quantity of phase T1(Al2CuLi) in grain boundry of weldment increased after solution and aging treatment, and the obvious precipitate free zone(PFZ) generated to grain boundry. The IGC does not occur to joint in as-welded(AW) condition, while the pitting corrosion occurs to both heat-affected zone(HAZ) and base metal of welded joint. The susceptibility to IGC of joint increased after aging treatment, both the pitting corrosion and IGC occurred to HAZ, and the severe IGC produced to base metal. It has excellent EXCO resistance for both weld metal and HAZ in AW condition, while the susceptibility to EXCO is higher for base metal. The EXCO resistance can be improved to base metal after aging treatment, however the susceptibility to EXCO will increase to HAZ. Results of electrochemical corrosion measurement show that, compared to the weldment after aging treatment, the self-corrosion potential of weldment is a little higher in AW condition, and its density of self-corrosion current is lower, consequently, it has the relatively better corrosion resistance.

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王少剛,黃燕,趙禮.時(shí)效處理對(duì)鋁鋰合金電子束焊接頭耐蝕性能的影響[J].稀有金屬材料與工程,2018,47(7):1973~1979.[Wang Shaogang, Huang Yan, Zhao Li. Effect of Aging Treatment on Corrosion Resistance of Al-Li Alloy Joint Welded by Electron Beam Welding[J]. Rare Metal Materials and Engineering,2018,47(7):1973~1979.]
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  • 收稿日期:2016-12-17
  • 最后修改日期:2017-03-05
  • 錄用日期:2017-03-16
  • 在線發(fā)布日期: 2018-10-10
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