The electroplating pretreatment of NdFeB magnets was simulated in this study, and the effect of the pickling process on element, matrix morphology and texture was discussed. The results showed that in the ordinary circumstance the acid solution con-centration should be below 4 mol/L and the pickling time was within 120 s. However the concentration was lower than 1 mol/L and the time was about 30 s in the ultrasonic environment. The precoating technology sequentially was studied. The results revealed that there were two main reactions of the corrosion and displacement in the precoating process, and these two reactions were more obvi-ous in the grain boundary. The electrochemical analysis illustrated that the corrosion and displacement reactions were affected obvi-ously by the current density and the precoating solution temperature, usually the current density was controlled about 0.3 A/dm2, and the temperature was about 318 K in the precoating process.
参考文献
| [1] | El-Moneim AA.;Gebert A..Electrochemical characterization of galvanically coupled single phases and nanocrystalline NdFeB-based magnets in NaCl solutions[J].Journal of Applied Electrochemistry,20039(9):795-805. |
| [2] | Yu LQ;Wen YH;Yan M.Effects of Dy and Nb on the magnetic properties and corrosion resistance of sintered NdFeB[J].Journal of Magnetism and Magnetic Materials,20042/3(2/3):353-356. |
| [3] | Wenting He;Liqun Zhu;Haining Chen;Haiyang Nan;Weiping Li;Huicong Liu;Yan Wang.Electrophoretic deposition of graphene oxide as a corrosion inhibitor for sintered NdFeB[J].Applied Surface Science: A Journal Devoted to the Properties of Interfaces in Relation to the Synthesis and Behaviour of Materials,2013Aug.15(Aug.15):416-423. |
| [4] | Jing Chen;Bajin Xu;Guoping Ling.Amorphous Al-Mn coating on NdFeB magnets: Electrodeposition from AlCl_3-EMIC-MnCl_2 ionic liquid and its corrosion behavior[J].Materials Chemistry and Physics,20122/3(2/3):1067-1071. |
| [5] | Steyaert S.;Teillet J.;Le Breton JM..Microstructure and corrosion resistance of Nd-Fe-B magnets containing additives[J].Journal of Physics, D. Applied Physics: A Europhysics Journal,199813(13):1534-1547. |
| [6] | Ma CB;Cao FH;Zhang Z;Zhang JQ.Electrodeposition of amorphous Ni-P coatings onto Nd-Fe-B permanent magnet substrates[J].Applied Surface Science: A Journal Devoted to the Properties of Interfaces in Relation to the Synthesis and Behaviour of Materials,20064(4):2251-2256. |
| [7] | 宋利晓;张昭;张鉴清;曹楚南.纳米结构黑镍薄膜的电沉积机理[J].金属学报,2011(1):123-128. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%