Improvement of corrosion resistance and research on corrosion mechanism after depositing Ni-Y2O3/Ni-graphene composite coatings on NdFeB magnets

IF 2.7 4区材料科学 Q3 CHEMISTRY, PHYSICAL

Surface Innovations Pub Date : 2022-11-14 DOI:10.1680/jsuin.22.01057

Yaru Zou, Yaojun Lu, S. Rehman, Xuehui Zhang, Sangen Luo, Chaoxiang Jin, Zhenggang Zou, Bin Yang, Munan Yang

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引用次数: 0

Abstract

In this paper, we studied the corrosion resistance of the composite deposition of Y2O3 and graphene on nickel coating. The corrosion resistance of the coating was significantly improved after the composite deposition, especially for the Ni-graphene coating with the addition of 0.05 g/L graphene. The Ecorr and Icorr of the coating were optimized to 404.340 mV and 0.24 × 10−8 A cm−2. The surface morphology, microstructure, passivation behavior, and corrosion products of the coating were analyzed, and the mechanism of corrosion resistance enhancement was revealed. The results show that the deposition of the Y2O3 and graphene composite can decrease the surface roughness of the coating. The graphene composite effect is the most significant and greatly reduces the contact area between the coating and the medium. In addition, the particle composite deposition can also yield grain refinement. The graphene composite deposition reduces the grain size from 75.3 to 18.9 nm, significantly improving the nucleation and formation of the passivation film. The uniform deposition of graphene at grain boundaries can also hinder the infiltration of corrosive media into the interior region. Upon the composite deposition, the improved corrosion resistance of magnets significantly increases their performance and service life, facilitating their railway applications.

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钕铁硼磁体Ni-Y2O3/ ni -石墨烯复合镀层耐蚀性能的提高及腐蚀机理研究

本文研究了Y2O3和石墨烯在镍涂层上复合沉积的耐蚀性。复合沉积后，涂层的耐腐蚀性显著提高，特别是添加0.05的Ni石墨烯涂层 g/L石墨烯。涂层的Ecorr和Icorr优化为404.340 mV和0.24×10−8 A. 对涂层的表面形貌、微观结构、钝化行为和腐蚀产物进行了分析，揭示了提高涂层耐蚀性的机理。结果表明，Y2O3和石墨烯复合材料的沉积可以降低涂层的表面粗糙度。石墨烯复合材料的效果最为显著，大大减少了涂层和介质之间的接触面积。此外，颗粒复合沉积还可以产生晶粒细化。石墨烯复合材料的沉积使晶粒尺寸从75.3减小到18.9 nm，显著改善了钝化膜的成核和形成。石墨烯在晶界处的均匀沉积也会阻碍腐蚀性介质渗透到内部区域。在复合沉积后，磁体的耐腐蚀性得到改善，显著提高了其性能和使用寿命，促进了其在铁路上的应用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Surface Innovations CHEMISTRY, PHYSICALMATERIALS SCIENCE, COAT-MATERIALS SCIENCE, COATINGS & FILMS

CiteScore

5.80

自引率

22.90%

发文量

期刊介绍： The material innovations on surfaces, combined with understanding and manipulation of physics and chemistry of functional surfaces and coatings, have exploded in the past decade at an incredibly rapid pace. Superhydrophobicity, superhydrophlicity, self-cleaning, self-healing, anti-fouling, anti-bacterial, etc., have become important fundamental topics of surface science research community driven by curiosity of physics, chemistry, and biology of interaction phenomenon at surfaces and their enormous potential in practical applications. Materials having controlled-functionality surfaces and coatings are important to the manufacturing of new products for environmental control, liquid manipulation, nanotechnological advances, biomedical engineering, pharmacy, biotechnology, and many others, and are part of the most promising technological innovations of the twenty-first century.