摘要
为了提高AZ80镁合金的耐磨及耐腐蚀性能,利用冷喷涂技术在其表面制备了316L不锈钢涂层。采用X射线衍射仪及扫描电镜对涂层的相结构、微观组织及粒子与基板的碰撞行为进行了分析,采用万能力学试验机测试了涂层的结合强度及内聚强度,并分别测试了涂层与块体的摩擦磨损及电化学腐蚀性能。结果表明:冷喷涂316L粒子与镁合金基板的碰撞行为主要呈现两种方式,一种是粒子在镁合金基板表面产生冲蚀坑,未能形成有效结合,另一种是粒子以球形方式嵌入镁合金基板内部,基板在两种碰撞行为中都形成射流,结合机理主要是机械咬合。316L涂层磨损率为1.16×10^(-4) mm^3/(N·m),其耐磨性较镁合金提高了8倍,涂层的自腐蚀电流较镁合金基体降低了4个数量级,能够有效保护镁合金基板。
In order to improve the wear resistance and corrosion resistance of AZ80 magnesium alloy,316 L stainless steel coating was prepared on its surface by cold spraying technology.The phase structure,microstructure and the impact behavior between particles and substrate were analyzed by means of X-ray diffractometer and scanning electron microscope.The bonding strength between the coating and the substrate was tested by universal mechanical testing machine.The friction,wear and electrochemical corrosion properties of the coating and the 316 L bulk were tested.The results show that the impact behavior between cold sprayed 316 L particles and magnesium alloy substrate is mainly in two ways:one is that the particles produce erosion pits on the surface of magnesium alloy substrate,which is unable to form an effective combination between the particles and the magnesium alloy substrate,the other is that the particles are embedded in the magnesium alloy substrate in a spherical manner,and the substrate forms a jet in both impact behaviors.The wear rate of the 316 L coating is 1.16×10-4 mm3/(N·m),and the wear resistance of the coating is 8 times higher than that of the magnesium alloy.The self-corrosion current of the coating is reduced by four orders of magnitude compared with that of the magnesium alloy substrate,which can effectively protect the magnesium alloy substrate.
作者
崔烺
刘光
贾利
王春婷
郑子云
马冰
CUI Lang;LIU Guang;JIA Li;WANG Chun-ting;ZHENG Zi-yun;MA Bing(Institute of Welding and Remanufacturing,Ningbo Branch of Chinese Academy of Ordnance Science,Ningbo 315103,China;Key Laboratory of Marine Materials and Related Technologies,Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences,Ningbo 315201,China)
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2019年第5期130-138,共9页
Transactions of Materials and Heat Treatment
基金
宁波市科技创新团队基金(2014B82001)
关键词
冷喷涂
316L不锈钢涂层
碰撞行为
摩擦磨损
电化学腐蚀
cold spray
316L stainless steel coating
impact behavior
frictional wear
electrochemical corrosion
