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

详细信息    查看全文

• 作者：Hong-yan WU ; Jian LIU ; Hao-feng ZHAO ; Qiong JIANG ; Yi XU ; Jia XU
• 关键词：corrosion resistance ; lamellar aluminum coating ; polygonal aluminum coating ; magnetic refrigeration ; pure gadolinium
• 刊名：Transactions of Nonferrous Metals Society of China
• 出版年：November, 2013
• 年：2013
• 卷：23
• 期：11
• 页码：3280-3285
• 全文大小：3886 K

文摘

Al 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.