文献类型：期刊文献

中文题名：Y_2O_3对铝合金磷化促进机理及成膜过程的影响

英文题名：Effect of Yttrium Oxide on Film-Forming Process of Phosphate Conversion Coating on Aluminium Alloy

作者：李红玲[1];刘双枝[2]

第一作者：李红玲

机构：[1]新乡学院化学与化工学院;[2]开封大学化学工程学院

第一机构：新乡学院化学化工学院

年份：2014

卷号：47

期号：1

起止页码：1-4

中文期刊名：材料保护

外文期刊名：Materials Protection

收录：CSTPCD;;北大核心:【北大核心2011】；CSCD:【CSCD2013_2014】；

基金：河南省科技攻关重点项目(122102310321)资助

语种：中文

中文关键词：磷化膜;氧化钇;铝合金;促进机理;成膜过程

外文关键词：phosphate conversion coating;;Y2O3;;Al alloy;;accelerating mechanism;;film-forming process

摘要：为了探讨稀土氧化物(Y2O3)对铝合金磷化处理过程的影响,采用SEM,EDS,交流阻抗及FTIR方法,对以Y2O3为添加剂的铝合金磷化的促进机理及成膜过程进行了研究。结果表明:Y2O3具有良好的载氧能力和阴极去极化作用,一方面Y2O3改变了铝合金的腐蚀反应动力学,电极表面生成的磷化膜阻碍了电子在铝合金表面的吸附与传输,一定程度上抑制了阴极反应,导致阴极电流密度下降;另一方面在成膜过程中使电极电位达到稳定的时间提前,成膜电流密度增大,成膜速度加快。
Y2O3,one kind of rare earth oxide,was introduced as an additive into the phosphate conversion fluid of aluminium alloy to prepare phosphate conversion coating. The effect of Y2O3on the film-forming process of the phosphate conversion coating was investigated based on scanning electron microscopic analysis,energy dispersive spectrometric analysis,and Fourier transform infrared spectrometric analysis as well as alternating current impedance spectroscopic measurement. It was found that Y2O3possessed good capacity to transport oxygen and depolarize cathode polarization. On the one hand,Y2O3led to change in the corrosion reaction kinetics of Al alloy, while the conversion coating formed on electrode surface retarded the adsorption and transmission of electrons on Al alloy surface. As a result,the cathode reaction was inhibited to some extent,and the cathode current density was reduced. On the other hand,Y2O3was able to reduce the time for the electrode potential to reach steady thereby increasing film-forming current density and accelerating film formation.