Chen Yajun*,Chen Zhuo,Wang Hansen,et al.Salt spray corrosion test and simulation of 2A12/TC4 coupling system under the influence of corrosion products[J].Plating & Finishing,2024,(3):6-15.[doi:10.3969/j.issn.1001-3849.2024.03.002]
腐蚀产物对2A12/TC4偶合体系盐雾腐蚀性能影响及仿真
- Title:
- Salt spray corrosion test and simulation of 2A12/TC4 coupling system under the influence of corrosion products
- 分类号:
- TG178
- 文献标志码:
- A
- 摘要:
- 研究了 2A12/TC4 偶合体系腐蚀机制以及腐蚀产物对腐蚀进程的影响。采用中性盐雾试验、腐蚀形貌观测、产物分析以及电化学测试等方法研究腐蚀产物对 2A12/TC4 偶合体系腐蚀进程的影响。搭建薄液膜环境下材料电化学测试平台，测量了 500 μ m NaCl 液膜下 2A12 铝合金、 TC4 钛合金的极化曲线，建立了腐蚀产物影响下的双金属电偶腐蚀模型，分析比对了偶合体系下电解质电位、电流密度、腐蚀深度以及腐蚀产物孔隙率等关键参数。由于腐蚀产物的阻碍作用， 2A12 铝合金腐蚀速率由 1.99 mm/a 降低至 0.97 mm/a ，腐蚀电流密度由 2.01×10 -5 A/cm 2 降低至 1.17×10 -5 A/cm 2 ，耐蚀性逐渐提高。生成的 Al 2 O 3 、 AlOOH 及 Al （ OH ） 3 等产物使结构逐渐致密，有效阻碍了腐蚀介质与基体的接触及带电粒子的扩散行为，因而腐蚀进程逐渐减缓。由构建的腐蚀产物影响下电偶腐蚀模型可知，在腐蚀过程中，腐蚀产物的孔隙率由 0.8 逐渐降低至 0.2 ，极大地阻碍了离子的扩散和迁移过程，使得电化学腐蚀效应减弱。由试验及模拟的腐蚀深度值对比可知，试验值均落在模拟结果的 10% 误差范围内。
- Abstract:
- ： The corrosion mechanism of 2A12/TC4 coupling system and the impact of corrosion products on the corrosion process were studied.Neutral salt spray test ， corrosion morphology observation ， product analysis and electrochemical testing were used to study the effect of corrosion products on the corrosion process of 2A12/TC4 coupling system. The electrochemical test platform was built in a thin liquid film environment ， and the polarization curves of 2A12 aluminum alloy and TC4 titanium alloy were measured under a 500 μ m NaCl liquid film ， and a model of bimetallic galvanic corrosion under the influence of corrosion products was established. Due to the hindering effect of corrosion products ， the corrosion rate of 2A12 aluminum alloy was reduced from 1.99 mm/a to 0.97 mm/a ， and the corrosion current density was reduced from 2.01×10 -5 A/cm 2 to 1.17×10 -5 A/cm 2 ， and the corrosion resistance was gradually improved. The generated products such as Al 2 O 3 ， AlOOH and Al （ OH ） 3 make the structure gradually dense ， which effectively hinders the contact between the corrosive medium and the substrate and the diffusion behavior of charged particles ， thus the corrosion process gradually slows down. From the constructed corrosion products under the influence of galvanic corrosion model can be seen ， in the corrosion process ， the porosity of corrosion products gradually reduced from 0.8 to 0.2 ， greatly hindered the diffusion and migration process of ions ， making the electrochemical corrosion effect weakened. From the comparison of test and simulation of the corrosion depth value ， the test values fall within the 10% error range of the simulation results.
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备注/Memo
收稿日期： 2023-05-15 修回日期： 2023-06-12 作者简介： 陈亚军（ 1976 —），男，博士，教授，研究方向为飞机结构材料失效分析， email ： yjchen@cauc.edu.cn 基金项目： 中央高校基本科研业务费高水平成果培育专项（ 3122022PY09 ）