<strong>7075-T6</strong>铝合金在<strong>3.5%NaCl</strong>溶液中的摩擦腐蚀性能研究

doi:10.11902/1005.4537.2024.201

中国腐蚀与防护学报

2025, Vol. 45

Issue (3): 803-811 CSTR: 32134.14.1005.4537.2024.201 DOI: 10.11902/1005.4537.2024.201

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7075-T6铝合金在3.5%NaCl溶液中的摩擦腐蚀性能研究

杜晋¹(

), 胡林岚¹, 孙健¹, 宋庆华¹, 陈蒙¹, 肖金坤²

^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

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

DU Jin¹(

), HU Linlan¹, SUN Jian¹, SONG Qinghua¹, CHEN Meng¹, XIAO Jinkun²

^1.School of Mechanical Engineering, Yangzhou Polytechnic College, Yangzhou 225009, China
^2.School of Mechanical Engineering, Yangzhou University, Yangzhou 225127, China

引用本文:

杜晋, 胡林岚, 孙健, 宋庆华, 陈蒙, 肖金坤. 7075-T6铝合金在3.5%NaCl溶液中的摩擦腐蚀性能研究[J]. 中国腐蚀与防护学报, 2025, 45(3): 803-811.
Jin DU, Linlan HU, Jian SUN, Qinghua SONG, Meng CHEN, Jinkun XIAO. Tribo-corrosion Performance of 7075-T6 Al-alloy in 3.5%NaCl Solution[J]. Journal of Chinese Society for Corrosion and protection, 2025, 45(3): 803-811.

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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Al₂O₃。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。

关键词 ： 7075-T6铝合金, 腐蚀, 摩擦腐蚀, 磨损机制

Abstract：

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 Al₂O₃. 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.

Key words： 7075-T6 Al-alloy corrosion tribo-corrosion wear mechanism

收稿日期: 2024-07-05 32134.14.1005.4537.2024.201

ZTFLH:

TG172

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

通讯作者: 杜晋，E-mail：dj.yangzhou@163.com，研究方向为金属表面改性与腐蚀防护

Corresponding author: DU Jin, E-mail: dj.yangzhou@163.com

作者简介: 杜晋，男，1978年生，博士，副教授

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https://www.jcscp.org/CN/10.11902/1005.4537.2024.201 或 https://www.jcscp.org/CN/Y2025/V45/I3/803

图1 摩擦腐蚀实验装置图

图2 7075-T6铝合金XRD谱

图3 7075-T6铝合金组织光镜图

图4 7075-T6铝合金在3.5%NaCl溶液中摩擦腐蚀条件下的OCP值和摩擦系数

图5 7075-T6铝合金在纯腐蚀和摩擦腐蚀条件下的动电位极化曲线

表1 7075-T6铝合金在纯腐蚀和在3.5%NaCl溶液中摩擦腐蚀条件下Tafel分析结果

图6 7075-T6铝合金在3.5%NaCl溶液中-1.5 VAg/AgCl和-0.7 VAg/AgCl恒电位条件下的电流密度和摩擦系数

图7 7075-T6铝合金在干摩擦和在3.5%NaCl溶液中摩擦腐蚀测试的摩擦系数

图8 7075-T6铝合金在干摩擦条件和在3.5%NaCl溶液中摩擦腐蚀测试的耐磨性

图9 7075-T6铝合金在干摩擦条件和在3.5%NaCl溶液中摩擦腐蚀测试的磨损率

图10 Si3N4对摩球在干摩擦条件和在3.5%NaCl溶液中摩擦腐蚀测试后的磨痕图

图11 7075-T6铝合金在干摩擦条件和在3.5%NaCl溶液中摩擦腐蚀测试后磨损表面的SEM图

图12 7075-T6铝合金在-1.5 VAg/AgCl和-0.7 VAg/AgCl条件下磨损表面的EDS图谱

图13 7075-T6铝合金磨痕的XPS图谱分析

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