烧结NdFeB表面Zn-Al涂层制备及耐腐蚀机理研究

江杰, 姜建军, 杨丽景, 雷步芳, 赵宇, 林建强, 宋振纶

Preparation and Corrosion Resistance of Zn-Al Coating on Sintered NdFeB Permanent Magnet

JIANG Jie, JIANG Jianjun, YANG Lijing, LEI Bufang, ZHAO Yu, LIN Jianqiang, SONG Zhenlun

表1 样品在20%NH4NO3溶液中浸泡不同时间后的电化学测试结果

Table 1 Electrochemical test results of samples immersed in 20%NH4NO3 for different times in 3.5%NaCl solution

Sample EcorrV vs.SCE IcorrA·cm-2 ΒcV·dec-1 ΒaV·dec-1 Rp NdFeB -0.867 5.035×10-5 0.72453 0.50607 1285.1 0 min -1.121 8.480×10-6 0.15615 0.26433 4189.5 30 min -1.149 1.534×10-5 0.30971 0.15248 1954 60 min -1.075 5.156×10-6 0.10879 0.13806 3559.3 90 min -1.090 6.694×10-6 0.30390 0.16827 4723.5 120 min -1.026 7.429×10-6 0.24633 0.17862 5086.5 150 min -0.940 2.885×10-5 1.12350 0.50481 5461.5