Deposition of cerium contained conversion films on LC4 alloy with square wave pulse method

来源期刊：Rare Metals2004年第1期

论文作者：ZHANG Wei, LI Jiuqing, WU Yinshun, ZHANG Pei, and HE Jianping) Corrosion and Protection Center, University of Science and Technology Beijing, Beijing , China) State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing , China

文章页码：48 - 52

摘    要：<正> Cerium contained conversion films were deposited on LC4 aluminum alloy using square wave pulse （SWP） in a CeCl3 solution with KMnO4 as the oxidant. Energy dispersive spectroscopy （EDS） and scanning electron microscopy （SEM） were adopted to study the composition and the morphology of the film. It is found that the film is composed of Al, Zn, Cu, and small amount of cerium. The polarization curves of the specimens treated with SWP technique measured in 3.5% （mass fraction） NaCl solution reveal that the film thus formed inhibits both the anodic and cathodic process of the corrosion of the specimen. The immersion tests of treated specimens in 3.5% NaCl solution indicate that the corrosion resistance of the SWP treated specimen is better than that of the untreated and is equivalent to or even better than that of the traditionally electro-chemically treated specimens.