Fabrication and anti-corrosion performance of superhydrophobic silane film on sintered NdFeB  

烧结钕铁硼表面超疏水硅烷膜的制备及其耐蚀性能

作　　者：Wen-tao JU Li JIANG Yan-xia LIANG Shu-ting XU Ke WANG Yu-meng YANG Ben-feng ZHU Guo-ying WEI Zhao ZHANG 琚文涛;江莉;梁燕霞;徐舒婷;王棵;杨雨萌;朱本峰;卫国英;张昭(中国计量大学材料与化学学院,杭州310018;浙江大学化学系,杭州310027)

机构地区：[1]College of Materials and Chemistry,China Jiliang University,Hangzhou 310018,China [2]Department of Chemistry,Zhejiang University,Hangzhou 310027,China

出　　处：《Transactions of Nonferrous Metals Society of China》2024年第9期2928-2942,共15页中国有色金属学报（英文版）

基　　金：financial support from the Public Welfare Projects of Zhejiang Province,China(No.LGG22E010002);the National Natural Science Foundation of China(Nos.52001300,52171083)。

摘　　要：An eco-friendly superhydrophobic protective film(DTMS/TEOS silane film)was fabricated on sintered NdFeB substrate through the utilization of electrochemically assisted deposition technology.The structure,properties,and film-forming mechanism of dodecyltrime-thoxysilane(DTMS)/tetraethoxysilane(TEOS)silane films were comprehensively analyzed using Fourier transform infrared spectroscopy(FT-IR),scanning electron microscopy(SEM),X-ray photoelectron spectroscopy(XPS),potentiodynamic polarization curves and electrochemical impedance spectroscopy(EIS).Based on the test results,it can be determined that this film has a superhydrophobic property with a hydrophobicity angle of 152°.This special property can be attributed to the long alkyl chains in the DTMS molecule,the rough morphology,and the low surface energy of the DTMS/TEOS silane film.The surface of sintered NdFeB is coated with a layered three-dimensional network silane film that forms through the condensation of silanol substances.This film provides excellent corrosion resistance to the sintered NdFeB substrate,reducing its corrosion current density to 2.02×10~(-6)A/cm~2.Moreover,the impact of film on the magnetic characteristics of sintered NdFeB was assessed and found to be minimal.采用电化学辅助沉积技术在烧结钕铁硼表面制备一种新型环保的超疏水耐蚀膜(DTMS/TEOS硅烷膜)。通过红外光谱(FT-IR)、扫描电子显微镜(SEM)、X射线光电子能谱(XPS)、动电位极化曲线和电化学阻抗谱(EIS)等技术,研究十二烷基三甲氧基硅烷(DTMS)/四乙氧基硅烷(TEOS)硅烷膜的结构、性能和成膜机理。结果表明,DTMS分子中长烷基链、DTMS/TEOS硅烷膜表面的粗糙形貌以及低表面能导致该膜具有超疏水性,疏水角为152°;烧结钕铁硼表面硅醇物质缩合形成的复杂层状三维网络硅烷膜具有较好的耐腐蚀性,可将烧结钕铁硼基底的腐蚀电流密度降低至2.02×10^(-6)A/cm^(2);此外,该膜对烧结钕铁硼的磁性能影响很小。

关 键 词：NdFeB magnet silane film corrosion resistance SUPERHYDROPHOBICITY electrochemically assisted deposition 

分 类 号：TG174.4[金属学及工艺—金属表面处理]