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镁合金上Cr/CrN多层膜的沉积与腐蚀性能

发表时间:2013-05-15  浏览量:1049  下载量:325
全部作者: 宋贵宏,杨肖平,熊光连,陈立佳,李锋
作者单位: 沈阳工业大学材料科学与工程学院
摘 要: 利用电弧离子镀技术,通过周期性改变沉积腔内生长气氛,在镁合金上制备了Cr/CrN多层膜。截面形貌显示沉积膜与衬底结合较好,基本没有孔洞等缺陷;膜层界面清晰,具有明显的层状周期性特征。氮化物单层较薄(调制周期较小)时,多层膜中仅有CrN相,而氮化物单层到一定厚度时,还有Cr2N相形成。多层膜的阳极极化曲线显示:镀膜试样的腐蚀电位均高于未镀膜试样,且相同厚度情况下,膜层的层数越多(调制周期越小),膜层的腐蚀电位越向正方向移动。然而,从腐蚀电位增加幅度和腐蚀电流变化来看,Cr/CrN多层膜对镁合金试样耐蚀性的改善非常有限,几乎没有防护作用。
关 键 词: 材料表面与界面;Cr/CrN多层膜;镁合金;腐蚀性能;电弧离子镀;调制周期
Title: Preparation and corrosive resistance of the Cr/CrN multilayer coatings on Mg alloy
Author: SONG Guihong, YANG Xiaoping, XIONG Guanglian, CHEN Lijia, LI Feng
Organization: School of Material Science & Engineering, Shenyang University of Technology
Abstract: The Cr/CrN multilayer films were prepared using arc ion plating on Mg alloy by periodically adjusting the growth atmosphere in chamber. The cross-section morphology showed that the films adhered well without defects such as pinhole on the interface between film and substrate. The films possessed the clear periodicity of the Cr and nitride and the clear interface between individual layers. As individual nitride layer is thinner (shorter modulation period), only CrN phase was in nitride layer. The Cr2N phase as well as CrN phase occurred as the individual nitride layer reached a critical thickness. The polarization curves of multilayer film showed that the corrosion potential of all samples with films was higher than one of the sample without films. Under same thickness, the corrosion potential shift toward positive with the more layer numbers (shorter modulation period) in multilayer films. However, the corrosion resistance of multilayer films had been hardly improved considering the increase amplitude of corrosion potential and variation of corrosion current.
Key words: surface and interface of material; Cr/CrN multilayer coating; Mg alloy; corrosive resistance; arc ion plating; modulation period
发表期数: 2013年5月第9期
引用格式: 宋贵宏,杨肖平,熊光连,等. 镁合金上Cr/CrN多层膜的沉积与腐蚀性能[J]. 中国科技论文在线精品论文,2013,6(9):823-828.
 
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