铝合金2024上钒酸盐转化膜的研究  

Study of vanadate conversion coating on the 2024Al alloy

作　　者：张学颖[1] 薛丽华[1] 吕坤[1] 王永光[1] 张建旗[1] 

机构地区：[1]内蒙古科技大学材料与冶金学院,内蒙古包头014010

出　　处：《内蒙古科技大学学报》2010年第4期327-329,333,共4页Journal of Inner Mongolia University of Science and Technology

摘　　要：利用浸渍法在铝合金表面获得钒酸盐转化膜,应用交流阻抗技术(EIS)研究了NaVO3浓度及浸泡时间对铝合金2024表面钒酸盐转化膜成膜过程的影响,扫描电子显微镜(SEM)与能量散射能谱(EDS)分析膜表面形貌与成分.结果表明,EIS显示当转化液中NaVO3的浓度为0.1 M时处理3 min得到的转化膜的阻抗值最大,达到7.17×105Ω.cm2;SEM显示在该溶液浓度下表面所形成的转化膜均匀致密,其成分主要由Al,V,Mg元素组成.钒酸盐转化膜工艺简单,对环境无污染,膜的耐蚀性强,具有一定的应用前景.2024 aluminum alloys were immersed in vanadium bath to obtain the vanadate conversion coating under various conditions,such as the vanadium concentration,immersion time.The corrosion resistance of the vanadate conversion coating surface was observed from the electrochemical impedance spectroscopy（EIS）;the scanning electron microscopy（SEM） and energy dispersive spectrometer（EDS） were used to analyze the surface morphology and composition of the layer.The results indicate that the better corrosion resistance coating can be obtained when the samples are submitted to an immersion in the conversion bath containing NaVO3 with concentration of 0.1 M for 3 min at 25 ℃,reaching 7.17×105 Ω·cm2;and a thicker conversion layer was observed from SEM in this case.EDS demonstrated that the layer is composed of Al,V,Mg and etc.The vanadate conversion process is simple and friendly to the environment;the film possesses high anticorrosive property,with a certain prospect in application.

关 键 词：钒酸盐转化膜 耐蚀性能 微观形态 铝合金2024 

分 类 号：TG146.21[一般工业技术—材料科学与工程]