Corrosion behavior and strengthening mechanism of Ni-Cu alloy coating on Nd-Fe-B magnets

IF 2.7 4区材料科学 Q3 CHEMISTRY, PHYSICAL Surface Innovations Pub Date : 2024-07-19 DOI:10.1680/jsuin.24.00025

Jiaxin Long, Xuefeng Xie, Yuxin Cai, Shuwei Zhong, Sangen Luo, Weilong Zhang, Munan Yang

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Abstract

In this paper, the Pulse-Reverse Current (PRC) electroplating technique was utilized to deposit Ni-Cu alloy coatings on the surface of Nd-Fe-B magnets. Compared with the Ni coating, the corrosion resistance of the Ni-Cu alloy coating has been significantly improved, with the corrosion potential Ecorr and the corrosion current density Icorr of -246 mV and 0.9 μA·cm-2, respectively. The results show that alloying can effectively prolong the incubation period of pitting nucleation and improve the self-healing ability of coating. The structure and microstructure of the coating show that the surface of the Ni-Cu coating is flat and the grains preferentially grow along the (111) close-packed surface, which also makes the coating have higher densification and significantly reduces the number of self-corrosion sites and corrosion tendency of the coating. The lower binding energy Cu2O produced by Ni-Cu coatings at the initial corrosion stage can reduce the formation of metal cation holes and prolong the incubation period of pitting corrosion. After pitting formation, the corrosion products Cu2O and Cu2(OH)3Cl of Cu in the pitting hole have a certain hindrance to corrosion and are conducive to promoting passive reconstruction, which is an important reason for the Ni-Cu alloy coating shows higher self-healing ability and higher corrosion resistance.

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钕铁硼磁体上镍铜合金涂层的腐蚀行为和强化机制

本文利用脉冲反向电流（PRC）电镀技术在钕铁硼磁体表面沉积了镍铜合金镀层。与镍镀层相比，镍铜合金镀层的耐腐蚀性能显著提高，腐蚀电位 Ecorr 和腐蚀电流密度 Icorr 分别为 -246 mV 和 0.9 μA-cm-2。结果表明，合金化能有效延长点蚀成核的潜伏期，提高涂层的自修复能力。涂层的结构和显微组织显示，Ni-Cu 涂层表面平整，晶粒优先沿（111）紧密堆积面生长，这也使得涂层具有更高的致密性，显著减少了涂层的自腐蚀点数量和腐蚀倾向。在腐蚀初期，Ni-Cu 涂层产生的结合能较低的 Cu2O 可以减少金属阳离子孔的形成，延长点蚀的潜伏期。点蚀形成后，点蚀孔中 Cu 的腐蚀产物 Cu2O 和 Cu2(OH)3Cl 对腐蚀有一定的阻碍作用，有利于促进被动重构，这是 Ni-Cu 合金涂层表现出较高自愈能力和较高耐腐蚀性能的重要原因。

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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.