封孔处理对钕铁硼永磁材料化学镀Ni-Zn-P镀层耐蚀性的影响  

Effect of Sealing Treatment on Corrosion Resistance of Electro⁃less Ni-Co-P Coating on NdFeB Permanent Magnetic Material

作　　者：王宏[1] 刘继超[2] WANG Hong;LIU Jichao(Department of Mechanical and Electrical Engineering,Datong Coal Vocational and Technical Col-lege,Datong 037003,China;Yanching Institute of Technology,Langfang 065202,China)

机构地区：[1]大同煤炭职业技术学院机电工程系,山西大同037003 [2]燕京理工学院,河北廊坊065202

出　　处：《电镀与精饰》2020年第11期5-9,共5页Plating & Finishing

基　　金：河北省青年基金项目(QN2019328)。

摘　　要：在钕铁硼永磁材料表面化学镀Ni-Zn-P镀层,为了进一步提高镀层耐蚀性,镀后进行封孔处理。在封孔过程中,采用不同方式搅拌封孔液,表征了封孔处理前后镀层的表面形貌和孔隙率,并测量了封孔处理前后镀层的极化曲线和阻抗谱。结果表明:采用磁力和超声波搅拌封孔液,封孔处理后镀层与未封孔镀层相比表面的微孔数量明显减少,孔隙率降低,对腐蚀介质的敏感性和腐蚀倾向性减弱,耐蚀性明显提高。相比之下,在封孔过程中采用超声波搅拌封孔液能实现更好的封孔效果,封孔处理后镀层的孔隙率最低,约为1.04%,其耐蚀性更好。Electroless Ni-Zn-P coating was deposited on the surface of NdFeB permanent magnet materi⁃al,and sealing treatment was carried out in order to further improve the corrosion resistance of the coat⁃ing.Different methods were used to stir the sealing solution in the process of coating sealing.The surface morphology and porosity of the coating before and after sealing treatment were characterized,and the po⁃larization curve and impedance spectrum of the coating before and after sealing treatment were mea⁃sured.The results showed that when the sealing solution was stirred by magnetic force and ultrasonic wave,the number of micropores on the surface of the coating and the porosity of the coating after sealing treatment were significantly reduced compared with that of the coating before sealing treatment.The sen⁃sitivity and corrosion tendency to corrosive medium were weakened,indicating that the corrosion resis⁃tance of the coating after sealing treatment was obviously improved.In contrast,using ultrasonic to stir the sealing solution can achieve better sealing treatment effect,the coating after sealing treatment pos⁃sessed the lowest porosity about 1.04%and much better corrosion resistance.

关 键 词：封孔处理 化学镀Ni-Zn-P镀层 钕铁硼永磁材料 耐蚀性 

分 类 号：TQ153[化学工程—电化学工业]