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

作　　者：习中革 张启富 江社明 刘秋元 胡春东 郭大伟 

机构地区：[1]中国钢研科技集团有限公司先进金属材料涂镀国家工程实验室,北京100081

出　　处：《腐蚀与防护》2015年第5期427-431,434,共6页Corrosion & Protection

基　　金：国家"十二五"科技支撑计划(2012BAJ13B03)

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。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.

关 键 词：锌镁合金 镀锌钢材(PVD) 耐蚀性 微观结构 

分 类 号：TG174[金属学及工艺—金属表面处理]