| LIN Song-sheng,SU Yi-fan,SONG Ke-wei,HU Fang,SHI Qian,HOU Hui-jun,WEI Chun-bei,LI Hong,DAI Ming-jiang.Influence of Transition Layer on Corrosion Resistance of Evaporated Al Coating on NdFeB Magnets[J],46(12):218-224 |
| Influence of Transition Layer on Corrosion Resistance of Evaporated Al Coating on NdFeB Magnets |
| Received:July 18, 2017 Revised:December 20, 2017 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2017.12.034 |
| KeyWord:NdFeB transition layer ion assisted evaporation Al coatings corrosion resistance |
| Author | Institution |
| LIN Song-sheng |
National Engineering Laboratory for Surface Engineering Technology, Key Lab of Guangdong for Modern Surface Engineering Technology, Guangdong Institute of New Materials, Guangzhou , China |
| SU Yi-fan |
National Engineering Laboratory for Surface Engineering Technology, Key Lab of Guangdong for Modern Surface Engineering Technology, Guangdong Institute of New Materials, Guangzhou , China |
| SONG Ke-wei |
National Engineering Laboratory for Surface Engineering Technology, Key Lab of Guangdong for Modern Surface Engineering Technology, Guangdong Institute of New Materials, Guangzhou , China |
| HU Fang |
National Engineering Laboratory for Surface Engineering Technology, Key Lab of Guangdong for Modern Surface Engineering Technology, Guangdong Institute of New Materials, Guangzhou , China |
| SHI Qian |
National Engineering Laboratory for Surface Engineering Technology, Key Lab of Guangdong for Modern Surface Engineering Technology, Guangdong Institute of New Materials, Guangzhou , China |
| HOU Hui-jun |
National Engineering Laboratory for Surface Engineering Technology, Key Lab of Guangdong for Modern Surface Engineering Technology, Guangdong Institute of New Materials, Guangzhou , China |
| WEI Chun-bei |
National Engineering Laboratory for Surface Engineering Technology, Key Lab of Guangdong for Modern Surface Engineering Technology, Guangdong Institute of New Materials, Guangzhou , China |
| LI Hong |
National Engineering Laboratory for Surface Engineering Technology, Key Lab of Guangdong for Modern Surface Engineering Technology, Guangdong Institute of New Materials, Guangzhou , China |
| DAI Ming-jiang |
National Engineering Laboratory for Surface Engineering Technology, Key Lab of Guangdong for Modern Surface Engineering Technology, Guangdong Institute of New Materials, Guangzhou , China |
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| Abstract: |
| The work aims to improve bonding strength and corrosion resistance of Al protective coatings on NdFeB magnets. Al transition layer was deposited on NdFeB magnets by magnetron sputtering, then the transition layer was bombarded at high bias voltage, Al protective layer was deposited by applying ion-assisted evaporation technique. Surface and cross-section morphology of the Al coatings were observed with SEM, corrosion resistance was tested by using electrochemical workstation and salt spray test, and adhesion to substrate was evaluated by performing tensile test. As magnetron sputtering target current increased from 10 A to 25 A, self-corrosion voltage of the as-deposited Al coatings decreased from －0.7367 V to －0.9075 V, and neutral salt spray corrosion resistance decreased as well. Provided that surface ion-assisted evaporated Al protective coatings were prepared in the same process, salt spray corrosion resistance time of Al protective coatings prepared at magnetron sputtering target current of 25 A with a 100 nm and 500 nm Al transition layer was 48 hours and 36 hours, respectively, the corrosion resistance of the coatings with transition layer was inferior to pure evaporated Al coating without transition layer (72h); salt spray corrosion resistance time of Al protective coatings prepared at magnetron sputtering target current of 15 A with a 100 nm and 500 nm Al transition layer was 96 hours and 103 hours, respectively, the corrosion resistance of the coatings with transition layer was superior to pure evaporated Al coating without transition layer. Bonding strength of Al protective coatings adopting transition layer technology was over 40 MPa, the coatings are firmly bonded with the NdFeB substrate. Bonding between Al coating and the NdFeB substrate can be improved by adopting transition layer technology, and corrosion resistance of ion-assisted evaporated Al coating can be improved by applying proper transition layer technology. |
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