Effect of second-phase particle on localized corrosion in Al–Zn–Mg–Cu–Mn alloy friction stir welded joint,Materials and Corrosion

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Effect of second-phase particle on localized corrosion in Al–Zn–Mg–Cu–Mn alloy friction stir welded joint
Materials and Corrosion ( IF 1.6 ) Pub Date : 2020-12-08 , DOI: 10.1002/maco.202012169
Haitao Dai ₁ , Lili Wei _{1,

2} , Hongfeng Huang _{1,

2} , Chongyu Liu ₁ , Zixing Jia ₁ , Xuda Xu ₃

Affiliation

The microstructure and corrosion behavior of a high-strength Al–Zn–Mg–Cu–Mn alloy friction stir welded (FSWed) joint were investigated using scanning electron microscope, transmission electron microscope, open-circuit potential test, and potentiodynamic polarization. The weld nugget zone and heat-affected zone (HAZ) of the FSWed joint showed diverse microstructural characteristics including micron-scale intermetallic particles and nanoscale precipitates, leading to different localized corrosion sensitivities. The results of electrochemical tests confirmed the regional difference of corrosion in FSWed joints. Detailed research on the corrosion process revealed that micron-scale Al(Fe,Mn,Si) particles promoted the dissolution of the vicinal matrix to induce pitting corrosion. The directionally distributed intermetallic particles and grain boundary precipitates in HAZ conduced to the development of intergranular microcracks into exfoliation. The matrix precipitates affected the localized corrosion tendency due to regional variation of the redissolution degree.

中文翻译：

第二相颗粒对Al-Zn-Mg-Cu-Mn合金搅拌摩擦焊接头局部腐蚀的影响

使用扫描电子显微镜、透射电子显微镜、开路电位测试和动电位极化研究了高强度 Al-Zn-Mg-Cu-Mn 合金搅拌摩擦焊 (FSWed) 接头的微观结构和腐蚀行为。FSWed 接头的焊核区和热影响区 (HAZ) 显示出多种微观结构特征，包括微米级金属间化合物颗粒和纳米级沉淀物，导致不同的局部腐蚀敏感性。电化学测试结果证实了 FSWed 接头腐蚀的区域差异。对腐蚀过程的详细研究表明，微米级的 Al(Fe,Mn,Si) 颗粒促进了邻近基体的溶解，从而诱发了点蚀。热影响区中定向分布的金属间化合物颗粒和晶界沉淀有助于晶间微裂纹发展为剥落。由于再溶解度的区域变化，基体析出物影响了局部腐蚀趋势。

更新日期：2020-12-08

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