Effect of Y and Zr addition on the intergranular corrosion of Al-Mg alloy after sensitization treatment

IF 2.2 3区工程技术 Q1 MICROSCOPY Micron Pub Date : 2025-02-08 DOI:10.1016/j.micron.2025.103789

Zhiqiang Ru , Lili Wei , Ming Liu , Zhimin Pi , Chang Han , Ming Qiu , Enbang Li , Hongfeng Huang , Degui Li

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Abstract

This paper investigates the effect of adding 0.1 % Y and 0.1 % Zr microalloying on the microstructure and corrosion resistance behavior of Al-5.5Mg-0.3Mn alloys sensitization treatment. The results show that the composite addition of Y and Zr could refine the grain structure and reduce the segregation of the Mg elements during casting. Some micro-scale AlMgYZr phases could also be found in the interior region of grains. After sensitization treatment, nano-sized Al₃(Y_1-x, Zr_x) particles induce a high proportion of low-angle grain boundaries (LAGBs) in the alloy, and the AlMgYZr phase suppresses the precipitation and coarsening of β phase (Al_xMg_y) at the grain boundaries (GBs). The refinement of the β phase reduces the micro-coupling corrosion effect at GBs and improves the intergranular corrosion (IGC) resistance of the alloy. The electrochemical self-corrosion voltage of the alloy is increased, and the self-corrosion current is decreased.

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添加Y和Zr对铝镁合金敏化后晶间腐蚀的影响

研究了添加0.1 % Y和0.1 % Zr微合金化对Al-5.5Mg-0.3Mn合金敏化处理组织和耐蚀性能的影响。结果表明，Y和Zr的复合添加可以细化晶粒组织，减少Mg元素的偏析。晶粒内部还存在一些微尺度的AlMgYZr相。敏化处理后，纳米Al3（Y1-x, Zrx）颗粒在合金中诱导出高比例的低角度晶界（LAGBs）， AlMgYZr相抑制了晶界(GBs) β相（AlxMgy）的析出和粗化。β相的细化降低了GBs处的微耦合腐蚀效应，提高了合金的抗晶间腐蚀性能。合金的电化学自腐蚀电压升高，自腐蚀电流减小。

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来源期刊

Micron 工程技术-显微镜技术

CiteScore

4.30

自引率

4.20%

发文量

100

审稿时长

31 days

期刊介绍： Micron is an interdisciplinary forum for all work that involves new applications of microscopy or where advanced microscopy plays a central role. The journal will publish on the design, methods, application, practice or theory of microscopy and microanalysis, including reports on optical, electron-beam, X-ray microtomography, and scanning-probe systems. It also aims at the regular publication of review papers, short communications, as well as thematic issues on contemporary developments in microscopy and microanalysis. The journal embraces original research in which microscopy has contributed significantly to knowledge in biology, life science, nanoscience and nanotechnology, materials science and engineering.