Zhong Zhijian*,Liu Chao,Li Chang.Study on surface modification and corrosion resistance of magnesium alloy for automobile[J].Plating & Finishing,2024,(7):15-21.[doi:10.3969/j.issn.1001-3849.2024.07.003]
汽车用镁合金的表面改性及耐蚀性能研究
- Title:
- Study on surface modification and corrosion resistance of magnesium alloy for automobile
- Keywords:
- automobiles ; AZ31B magnesium alloy ; coating ; soaking ; corrosion resistance
- 分类号:
- TG174.4
- 文献标志码:
- A
- 摘要:
- 采用旋涂法在汽车用镁合金表面制备了 4 种改性涂层（不含有机改性硅酸盐涂层和有机改性硅酸盐涂层），对比分析了改性涂层的显微形貌以及在 3.5% NaCl 溶液中浸泡不同时间后的耐腐蚀性能。结果表明，相较镁合金基体，浸泡前的不含有机改性硅酸盐涂层 A 试样和浸泡 1 d~9 d 的涂层试样的腐蚀电位都正移，腐蚀电流密度明显减小，涂层 A 的耐腐蚀性能明显优于镁合金基体； 4 种改性涂层的腐蚀电位都相较镁合金基体发生正向移动，且有机改性硅酸盐涂层（涂层 B 、涂层 C 和涂层 D ）的腐蚀电位都比涂层 A 更正、腐蚀电流密度相较涂层 A 更小，腐蚀电流密度从小至大顺序为：涂层 C< 涂层 D< 涂层 B< 涂层 A< 基体。随着浸泡时间的延长， 4 种改性涂层的腐蚀电流密度都在增加，但相同浸泡时间下，涂层 B 和涂层 C 的腐蚀倾向相比涂层 A 更小、腐蚀速率相比涂层 A 较慢，且涂层 C （ KH - 570/BTMSE=3/2 ）具有最佳的耐蚀性能。
- Abstract:
- ： Four modified coatings （ excluding organic modified silicate coatings and organic modified silicate coatings ） were prepared on the surface of magnesium alloy for automotive using spin coating method. The microstructure of the modified coatings and their corrosion resistance after immersion in 3.5%NaCl solution for different times were compared and analyzed. The results showed that the corrosion potential of the coating A sample before immersion and the coating sample soaked for 1-9 days both shifted in a positive direction compared to the magnesium alloy matrix ， resulting in a significant decrease in corrosion current density. The corrosion resistance of coating A was significantly better than that of the magnesium alloy matrix ； The corrosion potential of the four modified coatings shows a positive shift compared to the magnesium alloy substrate ， and the corrosion potential of organic modified silicate coatings （ coating B ， coating C ， and coating D ） is corrected compared to coating A. The corrosion current density is smaller than that of coating A. The order of corrosion current density from low to high is ： coating C< coating D
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备注/Memo
收稿日期： 2023-09-21 修回日期： 2023-10-28 作者简介： 钟志坚（ 1973 —），男，本科，讲师，研究方向：汽车材料， email ： zhzj148@126.com 基金项目： 广东省科技厅科技攻关项目（ 22GD02210019 ）?/html>