Preparation and characterization of TiO_2/acrylic resin composite coatings on sintered NdFeB permanent magnets by electrochemical deposition

作     者：Zhen-Chen Zhong Ji-Lin Xu Zheng-Xian Huang Jun-Ming Luo 

作者机构：School of Materials Science and Engineering Nanchang Hangkong University 

出 版 物：《Rare Metals》 (稀有金属（英文版）)

年 卷 期：2014年第33卷第6期

页      面：703-708页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：financially supported by the National Science and Technology Key Support Projects of China (No. 2012BAE02B01) the Major Science and Technology Special Projects of Jiangxi Province (No. 2010AZX00200) the Science and Technology Plan Projects of Jiangxi Province (Industrial field) (No. 20121BBE50001) the Science and Technology Plan Projects of Department of Education of Jiangxi Province (No. KJ201109132281) 

主　　题：NdFeB magnets Nano-TiO2 Acrylic resin Electrophoretic deposition Corrosion resistance 

摘      要：The sintered Nd Fe B permanent magnets are widely used in various industries because of their excellent magnetic and comprehensive properties. However, they are seriously hindered to further developments and applications owing to its poor corrosion resistance. In this paper,TiO2/acrylic resin composite coatings were successfully prepared on the sintered Nd Fe B permanent magnets by electrochemical deposition for the first time, and the corrosion behaviors were investigated by using immersion testing and potentiodynamic polarization tests. It is found that the coating is a composite, being composed of polymerized acrylic resin as the matrix and nano-rutile TiO2particles（-200 nm） as the reinforcements. It is about25 lm in thickness and its surface and cross-section exhibit uniform and smooth with no pores, cracks, and other defects. Compared with those of the uncoated Nd Fe B magnets, the weight loss of the coated samples immersed in H2SO4 solution reduces by two orders of magnitude,corrosion current density decreases by four orders of magnitude, and the corrosion potential of the coated sample is shifted in the noble direction by 400 m V. The mechanisms of corrosive resistance enhancement were discussed.