退火时间对锌镁合金镀层显微组织及耐蚀性的影响
Influence of Annealing Time on Microstructure and Corrosion Resistance of Zinc-Magnesium Alloy Coating
摘 要
采用物理气相沉积(PVD)镀镁加退火的复合工艺制备了锌镁合金镀层,采用XRD,SEM和EDS能谱分析锌镁合金镀层的相组成和微观结构,采用中性盐雾试验、中性循环盐雾加速腐蚀试验和电化学测试考察锌镁合金镀层的耐蚀性.结果表明,相比镀锌钢材(GI)镀层,锌镁合金镀层表观厚度增加不过10%,但是耐蚀性得到显著提升,具有优异的耐切边腐蚀能力,在镀层破损处具有优异的自愈能力,合金相的形成及腐蚀生成物是锌镁合金镀层具有高耐蚀特性的原因.
镀锌钢材(PVD)
耐蚀性
微观结构
Zn-Mg alloy coating
PVD (Physical Vapor Deposition)
corrosion resistance
microstructure
Abstract
A combined process of depositing Mg by PVD (Physical Vapor Deposition) followed by annealing was used to acquire Zn-Mg alloy coating.Phase composition and microstructure of Zn-Mg alloy coating were analyzed by XRD,SEM and EDS.NSST (Neutral Salt Spray Test),NCCT (Neutral Cyclic Corrosion Test) and electrochemical test were conducted to investigate the corrosion resistance of Zn-Mg alloy coatings.Experiments showed that compared with GI (Galvanized Iron),although the apparent thickness increased within 10%,the corrosion resistance of Zn-Mg alloy coating was greatly enhanced.Besides,Zn-Mg alloy coating has excellent self-healing ability at the cut-edge and damaged areas.Zn-Mg alloy phases and corrosion products could account for the enhanced corrosion resistance of Zn-Mg alloy coatings.
中图分类号 TG174
所属栏目 镀层专题
基金项目 国家“十二五”科技支撑计划(2012BAJ13B03)
收稿日期 2014/6/16
修改稿日期
网络出版日期
作者单位点击查看
备注习中革(1968-),高级工程师,博士研究生,从事钢带腐蚀与防护技术工作.
引用该论文: XI Zhong-ge,ZHANG QI-fu,JIANG She-ming,LIU Qiu-yuan,HU Chun-dong,GUO Da-wei. Influence of Annealing Time on Microstructure and Corrosion Resistance of Zinc-Magnesium Alloy Coating[J]. Corrosion & Protection, 2015, 36(5): 427
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