7075-T6铝合金在3.5%NaCl溶液中的摩擦腐蚀性能研究  

Tribo-corrosion Performance of 7075-T6 Al-alloy in 3.5%NaCl Solution

作　　者：杜晋[1] 胡林岚[1] 孙健 宋庆华 陈蒙 肖金坤[2] DU Jin;HU Linlan;SUN Jian;SONG Qinghua;CHEN Meng;XIAO Jinkun(School of Mechanical Engineering,Yangzhou Polytechnic College,Yangzhou 225009,China;School of Mechanical Engineering,Yangzhou University,Yangzhou 225127,China)

机构地区：[1]扬州市职业大学机械工程学院,扬州225009 [2]扬州大学机械工程学院,扬州225127

出　　处：《中国腐蚀与防护学报》2025年第3期803-811,共9页Journal of Chinese Society For Corrosion and Protection

基　　金：国家自然科学基金(52374372);扬州市科技计划项目(YZ2023207)。

摘　　要：研究7075-T6铝合金在3.5%(质量分数)NaCl溶液中的摩擦腐蚀性能,对铝合金表层钝化膜和摩擦腐蚀表面进行了观察和分析。结果表明:滑动摩擦导致铝合金材料开路电位和动电位极化腐蚀电位降低以及腐蚀电流密度显著增加。在恒阴极电位条件下,摩擦行为去除了钝化膜,加速了析氢反应。在恒阳极电位条件下,摩擦导致腐蚀电流密度显著增大,加速了材料的腐蚀。XPS分析显示,钝化膜的主要成分为Al_(2)O_(3)。在干摩擦、开路电位、恒阳极电位和恒阴极电位条件下的摩擦系数和磨损率排序规律一致,为干摩擦>恒阳极电位>开路电位>恒阴极电位。干摩擦磨损机制为粘着磨损,开路电位和恒阴极电位下的磨损机制为磨粒磨损,恒阳极电位下的磨损机制为腐蚀磨损。The tribo-corrosion performance of 7075-T6 Al-alloy in 3.5%(mass fraction)NaCl solution was studied,while the variation of the passivation film and the tribo-corroded surface was also examined versus the tribo-corrosion process.The results demonstrate that sliding friction leads to a decrease in the open-circuit potential(OCP)and the potentiodynamic polarization corrosion potential of Al-alloy,whereas,a significant increase in the corrosion current density.In constant cathodic potential condition,the passivation film was removed due to the friction,accelerating the hydrogen evolution reaction.In constant anodic potential condition,friction leads to a significant increase in corrosion current density,accelerating the corrosion of the alloy.XPS analysis result indicates that the primary constituent of the passivation film is Al_(2)O_(3).In conditions of dry sliding friction,OCP,constant anodic potential,and constant cathodic potential,respectively,the values of friction coefficient and wear rate can be ranked as the following decline order:dry sliding friction>constant anodic potential>OCP>constant cathodic potential.The wear mechanism in dry sliding friction condition is adhesive wear,the wear mechanisms in OCP and constant cathodic potential conditions are abrasive wear,and the wear mechanism in constant anodic potential condition is corrosive wear.

关 键 词：7075-T6铝合金 腐蚀 摩擦腐蚀 磨损机制 

分 类 号：TG172[金属学及工艺—金属表面处理]