In this work, the authors studied the corrosion resistance of composite deposits of yttrium (III) oxide (Y₂O₃) and graphene on a nickel (Ni) coating. The corrosion resistance of the coating was significantly improved after the composite deposition, particularly for the nickel–graphene coating with the addition of 0.05 g/l graphene. The E _corr and I _corr of the coating were optimized to 404.340 mV and 0.24 × 10⁻⁸ A/cm², respectively. 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 deposition of the yttrium (III) oxide and graphene composite can decrease the surface roughness of the coating. The graphene composite has a more significant effect and greatly reduces the contact area between the coating and the medium. Moreover, particle composite deposition can also lead to grain refinement. Graphene composite deposition reduces the grain size from 75.3 to 18.9 nm, significantly improving the nucleation and formation of the passivation film. Uniform deposition of graphene at grain boundaries can also hinder the infiltration of corrosive media into the interior region. Upon composite deposition, the improved corrosion resistance of magnets significantly increases their performance and service life, facilitating their railway applications.

中文翻译：

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NdFeB磁体上沉积Ni-Y2O3/Ni-石墨烯复合涂层耐腐蚀性能的提高及腐蚀机理研究

在这项工作中，作者研究了镍(Ni) 涂层上氧化钇 (III) (Y ₂ O _{3 ) 和石墨烯复合沉积物的耐腐蚀性。}复合沉积后涂层的耐腐蚀性能显着提高，特别是添加0.05 g/l石墨烯的镍-石墨烯涂层。涂层的E _corr和I _corr优化为404.340 mV和0.24 × 10 -8 ^A  /cm ² ， 分别。对涂层的表面形貌、显微结构、钝化行为和腐蚀产物进行了分析，揭示了耐蚀性增强的机理。结果表明，氧化钇(III)和石墨烯复合物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更为显着，大大减少了涂层与介质的接触面积。此外，颗粒复合沉积还可以导致晶粒细化。石墨烯复合沉积将晶粒尺寸从75.3纳米减小到18.9纳米，显着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可以阻碍腐蚀性介质渗透到内部区域。复合沉积后，