时效处理对新型Al-5.6Zn-1.6Mg-0.15Zr合金显微组织及耐腐蚀性能的影响

doi:10.13251/j.issn.0254-6051.2021.01.030

金属热处理 ›› 2021, Vol. 46 ›› Issue (1): 161-166.DOI: 10.13251/j.issn.0254-6051.2021.01.030

时效处理对新型Al-5.6Zn-1.6Mg-0.15Zr合金显微组织及耐腐蚀性能的影响

黄元春^1,2, 谭维杨¹, 张传超¹, 王艳玲¹

1.中南大学轻合金研究院,湖南长沙 410083;
2.中南大学高性能复杂制造国家重点实验室,湖南长沙 410083

收稿日期:2020-06-19 出版日期:2021-01-25 发布日期:2021-01-26
作者简介:黄元春(1966—),男,教授,博士,主要研究方向为金属材料设计及构件成形工艺,E-mail:science@csu.edu.cn
基金资助:
国家自然科学基金(U1837207)

Effect of aging treatment on microstructure and corrosion resistance of new Al-5.6Zn-1.6Mg-0.15Zr alloy

Huang Yuanchun^1,2, Tan Weiyang¹, Zhang Chuanchao¹, Wang Yanling¹

1. Light Alloy Research Institute,Central South University,Changsha Hunan 410083,China;
2. State Key Laboratory of High Performance and Complex Manufacturing,Central South University,Changsha Hunan 410083,China

Received:2020-06-19 Online:2021-01-25 Published:2021-01-26

摘要/Abstract

摘要： 通过晶间腐蚀试验(IGC)、剥落腐蚀试验(EXCO)及电化学腐蚀试验,结合光学显微镜(OM)、扫描电镜(SEM)及配套能谱分析仪(EDS)和透射电镜(TEM)等手段,研究Al-5.6Zn-1.6Mg-0.15Zr合金板材在120 ℃下时效不同时间后微观组织、腐蚀状态及耐腐蚀性能的变化。结果表明:新型Al-5.6Zn-1.6Mg-0.15Zr合金整体耐腐蚀性能较好,其晶间腐蚀和剥落腐蚀敏感性随着时效时间的增加明显降低,经电化学腐蚀试验所得极化曲线也表现出了相同的趋势。时效处理对合金耐蚀性的影响主要与晶界析出相η(MgZn₂)和无沉淀析出带(PFZ)的变化有关。随着时效时间的增加,晶界析出相聚集粗化,且由连续析出转变成不连续析出,无沉淀析出带变宽,这些变化使得阳极腐蚀通道被切断,腐蚀不能连续进行,从而提高了合金的耐腐蚀性能。

关键词: Al-Zn-Mg-Zr合金, 晶间腐蚀, 剥落腐蚀, 显微组织, 耐腐蚀性能

Abstract: Changes in the microstructure,corrosion states,and corrosion resistance of Al-5.6Zn-1.6Mg-0.15Zr alloy sheet after aging at 120 ℃ for different time were studied by means of intergranular corrosion experiment (IGC),exfoliation corrosion experiment (EXCO) and electrochemical corrosion experiment,optical microscope (OM),scanning electron microscope (SEM),energy spectrum analysis (EDS) and transmission electron microscope (TEM).The results show that the new Al-5.6Zn-1.6Mg-0.15Zr alloy has good overall corrosion resistance,and its sensitivity to intergranular corrosion and spalling corrosion decreases significantly with the increase of aging time.The polarization curve obtained by electrochemical corrosion experiments also shows the same trend.The effect of aging on corrosion resistance of the alloy is mainly related to the change of grain boundary precipitation phase η (MgZn₂) and the precipitation-free zone (PFZ).With the increase of aging time,the grain boundary precipitation phase aggregates and coarsens,and changes from continuous precipitation to discontinuous precipitation,and the PFZ becomes wider.These changes cause the anodic corrosion channel to be cut off,and the corrosion cannot continue,thereby improves the corrosion resistance of the alloy.

Key words: Al-Zn-Mg-Zr alloy, intergranular corrosion, exfoliation corrosion, microstructure, corrosion resistance

中图分类号:

TG146.2

黄元春, 谭维杨, 张传超, 王艳玲. 时效处理对新型Al-5.6Zn-1.6Mg-0.15Zr合金显微组织及耐腐蚀性能的影响[J]. 金属热处理, 2021, 46(1): 161-166.

Huang Yuanchun, Tan Weiyang, Zhang Chuanchao, Wang Yanling. Effect of aging treatment on microstructure and corrosion resistance of new Al-5.6Zn-1.6Mg-0.15Zr alloy[J]. Heat Treatment of Metals, 2021, 46(1): 161-166.

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时效处理对新型Al-5.6Zn-1.6Mg-0.15Zr合金显微组织及耐腐蚀性能的影响

Effect of aging treatment on microstructure and corrosion resistance of new Al-5.6Zn-1.6Mg-0.15Zr alloy

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