Luo Youbin,Liu Ninghua*,Zheng Jiawei,et al.Preparation and performance characterization of Mo/Ti/V composite coating on 7075 aluminum alloy?/html>[J].Plating & Finishing,2024,(4):90-98.[doi:10.3969/j.issn.1001-3849.2024.04.013]
7075铝合金表面钼/钛/钒复合转化膜的制备与性能表征
- Title:
- Preparation and performance characterization of Mo/Ti/V composite coating on 7075 aluminum alloy?/html>
- 关键词:
- 7075 铝合金; 钼 / 钛 / 钒复合转化膜; 耐腐蚀; 钼酸铵; 无铬
- Keywords:
- 7075 aluminum alloys ; Mo/Ti/V composite coatings ; corrosion resistance ; ammonium molybdate solution ; chromium-free
- 摘要:
- 采用钼酸盐和钛酸盐为主盐，以偏钒酸钠为成膜促进剂，植酸钠为有机添加剂，在 7075 铝合金表面制备了钼 / 钛 / 钒复合转化膜。借助扫描电子显微镜（ SEM ）、能谱仪（ EDS ）和 X 射线光电子能谱仪（ XPS ）分析了膜层的微观形貌、元素组成和化学成分，采用电化学工作站考察了基体和膜层的耐蚀性。实验结果表明：最佳转化液配方为 2 g·L -1 植酸钠、 1.5 g·L -1 偏钒酸钠、 1.5 g·L -1 六氟钛酸及 25 g·L -1 钼酸铵，最佳成膜条件为 15 min 和 35 ℃ 。膜层主要成分为 Al 2 O 3 、 MoO 2 、 MoO 3 、 V 2 O?sub>5? TiO 2 。钼 / 钛 / 钒复合转化膜使 7075 铝合金的腐蚀电位正移了 206.401 mV ，腐蚀电流密度降低了 9.912 μ A·cm -2 ，有效提高了基体的耐蚀性。
- Abstract:
- ： Molybdenum/titanium/vanadium composite conversion coatings were prepared on the surface of 7075 aluminum alloy using molybdate and titanate as the main salts ， sodium metavanadate as the film-forming promoter and sodium phytate as the organic additive. The microscopic morphology ， elemental composition and chemical composition of the film layer were analysed with the aid of scanning electron microscope （ SEM ）， energy spectrometer （ EDS ） and X-ray photoelectron spectroscopy （ XPS ）， and the corrosion resistance of the substrate and the film layer were investigated using an electrochemical workstation. The experimental results showed that the optimum formulation of conversion solution was 2 g·L -1 sodium phytate solution ， 1.5 g·L -1 sodium metavanadate solution ， 1.5 g·L -1 hexafluoro titanate solution and 25 g·L -1 ammonium molybdate solution ， and the optimum film formation conditions were 15 minutes and 35 ℃. The main components of the coating were Al 2 O 3 ， MoO 2 ， MoO 3 ， V 2 O 5 and TiO 2 . Mo/Ti/V conversion coating positively shifted the corrosion potential of the 7075 aluminum alloy by 260.401 mV and reduced the self-corrosion current density by 9.912 μ A·cm -2 ， which effectively improved the corrosion resistance of the substrate.
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备注/Memo
收稿日期： 2023-09-06 修回日期： 2023-10-20 作者简介： 罗有斌（ 1996 —），男，工程师，主要研究金属环保型表面处理技术， email ： kylelo96@qq.com * 通信作者： 刘宁华（ 1985 —），女，工程师，主要研究金属环保型表面处理技术， email ： newliunh@126.com 7075?/html>