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

IF 4.7 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING Transactions of Nonferrous Metals Society of China Pub Date : 2024-09-01 DOI:10.1016/S1003-6326(24)66586-6

Wen-tao JU , Li JIANG , Yan-xia LIANG , Shu-ting XU , Ke WANG , Yu-meng YANG , Ben-feng ZHU , Guo-ying WEI , Zhao ZHANG

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Abstract

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/cm². Moreover, the impact of film on the magnetic characteristics of sintered NdFeB was assessed and found to be minimal.

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烧结钕铁硼超疏水硅烷膜的制备与防腐蚀性能

利用电化学辅助沉积技术，在烧结钕铁硼基底上制备了一种环保型超疏水保护膜（DTMS/TEOS 硅烷膜）。利用傅里叶变换红外光谱（FT-IR）、扫描电子显微镜（SEM）、X射线光电子能谱（XPS）、电位极化曲线和电化学阻抗能谱（EIS）对十二烷基三肟基硅烷（DTMS）/四乙氧基硅烷（TEOS）硅烷薄膜的结构、性能和成膜机理进行了综合分析。根据测试结果，可以确定这种薄膜具有超疏水特性，疏水角为 152°。这种特殊性质可归因于 DTMS 分子中的长烷基链、粗糙的形态以及 DTMS/TEOS 硅烷薄膜的低表面能。烧结钕铁硼表面有一层通过硅醇物质缩合形成的层状三维网络硅烷膜。这层薄膜为烧结钕铁硼基底提供了出色的耐腐蚀性，使其腐蚀电流密度降低到 2.02×10-6 A/cm2。此外，还评估了薄膜对烧结钕铁硼磁特性的影响，结果发现这种影响微乎其微。

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来源期刊

Transactions of Nonferrous Metals Society of China 工程技术-冶金工程

CiteScore

7.40

自引率

17.80%

发文量

8456

审稿时长

3.6 months

期刊介绍： The Transactions of Nonferrous Metals Society of China (Trans. Nonferrous Met. Soc. China), founded in 1991 and sponsored by The Nonferrous Metals Society of China, is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology, including mineral processing, extraction metallurgy, metallic materials and heat treatments, metal working, physical metallurgy, powder metallurgy, with the emphasis on fundamental science. It is the unique preeminent publication in English for scientists, engineers, under/post-graduates on the field of nonferrous metals industry. This journal is covered by many famous abstract/index systems and databases such as SCI Expanded, Ei Compendex Plus, INSPEC, CA, METADEX, AJ and JICST.