转化时间对镁合金表面铈转化膜的影响  

Influence of Immersion Time on Cerium Coatings on Magnesium Alloys

作　　者：李梅[1] 范蕾蕾[1] 耿浩然[1] 周永志[1] 

机构地区：[1]济南大学材料科学与工程学院,山东济南250022

出　　处：《济南大学学报（自然科学版）》2011年第3期231-234,共4页Journal of University of Jinan(Science and Technology)

基　　金：国家自然科学基金(50871047)

摘　　要：以0.02 mol/L的Ce(NO3)3和2.92 g/L的强氧化剂H2O2为原料,采用浸泡法在镁合金(AZ91)表面制备铈转化膜。采用扫描电镜(SEM)、能谱仪(EDS)和X-射线衍射(XRD)对转化膜进行检测,实验结果表明:Ce在转化膜中主要以Ce(OH)3和CeO2的形式存在,当转化时间为10,15,20和25 min时,Ce在转化膜中的质量分数分别为2.21%,3.89%,10.03%和12.95%,转化时间小于20 min时,转化膜的耐腐蚀性能逐渐提高,大于20 min时,转化膜的耐腐蚀性能开始下降。Fine corrosion resistance of cerium conversion coatings on AZ91 magnesium alloy were synthesized by immersion method using 0.02 mol/L Ce（NO3）3 and 2.92 g/L oxidant H2O2 as raw materials.The as-prepared samples were studied by scanning electron microscope（SEM）,energy disperse spectroscopy（EDS） and X-ray diffraction（XRD）.The results show that Ce mainly exists in the form of Ce（OH）3 and CeO2 in conversion coatings.When the immersion time is 10,15,20 and 25 min,the mass fraction of Ce in the conversion film is 2.21%,3.89%,10.03% and 12.95% respectively.And when the immersion time is less than 20 min,the corrosion resistance of conversion coatings can be gradually improved.However,it begins to decline after 20 min.

关 键 词：铈转化膜 AZ91镁合金 腐蚀防护 预处理 

分 类 号：TG178[金属学及工艺—金属表面处理]