Effect of surface microstructure of aluminum coating on corrosion properties of magnetic refrigerant gadolinium  

磁控溅射铝膜的微观结构对磁致冷钆腐蚀性能的影响(英文)

作　　者：吴红艳[1] 刘剑[1] 赵浩峰[1] 蒋琼[2] 徐一[2] 徐佳[1] 

机构地区：[1]南京信息工程大学物理与光电工程学院,南京210044 [2]南京航空航天大学材料科学与工程学院,南京210016

出　　处：《Transactions of Nonferrous Metals Society of China》2013年第11期3280-3285,共6页中国有色金属学报（英文版）

基　　金：Project(BK2012463)supported by the Natural Science Foundation of Jiangsu Province of China;Project(51245010)supported by Special Funds of the National Natural Science Foundation of China;Project(11047143)supported by the National Natural Science Foundation of China;Projects(12KF069,12KF036)supported by Opening Found of Laboratory of Nanjing University of Information Science and Technology,China

摘　　要：AI coatings with different microstructures were prepared on the surface of Gd using the magnetron sputtering technique to improve its corrosion resistance. The corrosion behaviors for the pure Gd and Gd with Al coating in distilled water were studied using the mass loss and electrochemical performance. As a result, pure Gd without coating shows a certain amount of surface cracks under water flow conditions, whereas the polygonal Al coating decreases the path of the corrosive medium to body due to the existence of eroding pits structure. Compared with the polygonal structure Al coating and pure Gd, the lamellar structure of Al coating exhibits a higher electrochemical protection performance （e.g., a lower corrosion current and higher self-corrosion potential） and no occurrence of pitting corrosion. Due to an effective physical shield, the formation of the lamellar structure protected the inner Gd part from being corroded, and prolonged the duration of cathodic protection.研究了表面镀铝和未镀铝的钆的静态和电化学腐蚀试验。结果表明,未镀铝的钆在水作用下表面形成大量裂痕,而多角状的铝膜结构由于点蚀坑的存在比片状铝膜结构的耐腐蚀性能差。片状铝膜由于与基体之间形成有效的物理阻挡,且片状结构致密,延长了阴极保护。因此,制备表面层状铝膜结构是显著提高磁制冷钆表面耐腐蚀性能行的有效方法。

关 键 词：corrosion resistance lamellar aluminum coating polygonal aluminum coating magnetic refrigeration pure gadolinium 

分 类 号：TG174.44[金属学及工艺—金属表面处理]