Effects of Mo addition on anti-corrosion and mechanical properties of Al coating deposited sintered Nd-Fe-B magnets
Source abstract
Abstract
Due to the poor mechanical properties and insufficient corrosion resistance of Al coating on sintered Nd-Fe-B magnets, the effect of the addition of Mo as well as the ratio of Al and Mo during the co-deposition process are systematically investigated. The Al 75 Mo 25 coating with the amorphous structure exhibits the superior corrosion resistance because of the flatter surface and dense passivation film, which cuts off the rapid propagation channel of the corrosion medium such as Cl - . The corrosion current density of the Al 75 Mo 25 coating reaches 6.1 × 10 -7 A·cm -2 , which is about one-third of the Al coating. Additionally, the coating demonstrates excellent mechanical properties, and the hardness of the coating increased from 0.41 GPa for the Al coating to 6.52 GPa. Furthermore, the amorphous coating does not compromise the magnetic properties of the Nd-Fe-B substrate. The results show that the addition Mo within limits can improve the anti-corrosion and mechanical properties of the Al coating. The work above clearly illustrates the practical value of the Al-Mo amorphous coating in improving the surface protection effect for the magnets. The work provides a promising way for improving the properties of Al coated sintered Nd-Fe-B magnets.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Magnetic Properties of Alloys · Metallurgical and Alloy Processes · Hydrogen Storage and Materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (40)
Show source-provided references
1. Magnetic materials and devices for the 21st century: stronger, lighter, and more energy efficient10.1002/adma.201002180 ↗
2. Significant progress of grain boundary diffusion process for cost-effective rare earth permanent magnets: a review10.1016/j.matdes.2021.110004 ↗
3. Temperature-dependent evolution of REFe2 phase and correlated coercivity responses in post-sinter annealed Nd–Ce–Fe–B magnets10.1016/j.actamat.2025.120969 ↗
4. Effect of different deposition sequences on the magnetic properties of sintered Nd–Fe–B magnets diffused with multicomponent Tb–Cu films10.1016/j.jmrt.2023.10.181 ↗
5. Effect of multicomponent Tb-Cu films diffusion on the magnetic properties and thermal stability of sintered Nd-Fe-B magnets10.1016/j.jallcom.2023.169303 ↗
6. Effect of grain boundary diffusion in TbF3-Al mixed electrophoresis on properties of sintered Nd-Fe-B magnets10.1016/j.jmmm.2022.170324 ↗
7. Magnetic properties and microstructural evolution of sintered Nd-Fe-B magnets via Tb-Pr-Ce-Cu diffusion
8. Improved corrosion resistance of Co,Al-alloyed NdFeB magnetic nanostructures processed by microwave synthesis techniques10.1109/TMAG.2018.2838599 ↗
9. Effect of Cu grain boundary modification on microstructure and corrosion resistance in recycled Nd-Fe-B sintered magnets10.1016/j.jmmm.2022.169109 ↗
10. Improvement in magnetic properties, corrosion resistance and microstructure of Nd–Fe–B sintered magnets through intergranular addition of Tb68Ni3210.1016/j.jre.2021.03.007 ↗
11. Effects of grain boundary ternary alloy doping on corrosion resistance of (Ce,Pr,Nd)-Fe-B permanent magnets10.1016/j.jre.2020.09.012 ↗
12. Microstructure and magnetic properties of NdFeB alloys by co-doping alnico elements10.1016/j.physleta.2019.125878 ↗
13. Phosphate conversion of electroplated Ni coatings on NdFeB magnets improving the anticorrosion property10.1016/j.jallcom.2022.166206 ↗
14. Preparation of coatings with high adhesion strength and high corrosion resistance on sintered Nd–Fe–B magnets through electroless plating10.1016/j.matchemphys.2008.08.048 ↗
15. Achieving Sustainable Development Goals in rare earth magnets production: A review on state of the art and SWOT analysis10.1016/j.rser.2020.110616 ↗
16. Corrosion resistance of molybdate and phosphate composite passivation film on Zn-plated sintered Nd-Fe-B magnets10.1016/j.apsusc.2025.162543 ↗
17. Effect of bias voltage on the properties of CeO2−x coatings prepared by magnetron sputtering10.1016/j.surfcoat.2016.11.104 ↗
18. Phosphating passivation of vacuum evaporated Al/NdFeB magnets boosting high anti-corrosion performances10.1016/j.surfcoat.2020.126115 ↗
19. Corrosion behaviour of sintered NdFeB coated with Al/Al2O3 multilayers by magnetron sputtering10.1016/j.apsusc.2010.11.162 ↗
20. Effects of bias voltage on coating structures and anticorrosion performances of PA-PVD Al coated NdFeB magnets10.1016/j.jre.2020.07.025 ↗
21. The effect of phase structure on the corrosion behavior of Al100-xMox alloy thin films10.1016/j.jallcom.2019.03.230 ↗
22. Corrosion behaviour of sintered NdFeB deposited with an aluminium coating10.1016/j.corsci.2011.02.006 ↗
23. Corrosion behaviour of a rapidly solidified Al87.4Co7.9Ce4.7 layer prepared by large area electron beam irradiation10.1016/j.apsusc.2014.09.067 ↗
24. Passivity and its breakdown in Al-based amorphous alloys10.1016/j.matchemphys.2004.11.017 ↗
25. Microstructure design and strengthening of mechanical properties in Al–Si alloy through 0.05 wt % Ni-base amorphous alloy10.1016/j.vacuum.2021.110714 ↗
26. Annealed Al-Cr coating: A hard anti-corrosion coating with grain boundary modification effect for Nd-Fe-B magnets10.1016/j.jallcom.2021.159229 ↗
27. Solid solution or amorphous phase formation in Al-Mo alloyed films and their mechanical properties10.1016/j.jallcom.2018.02.230 ↗
28. Corrosion protection of Zn-Mo coatings electrodeposited from alkaline solutions10.1016/j.surfcoat.2023.129737 ↗
29. Tensile behavior of Al1−xMox crystalline and amorphous thin films10.1016/j.actamat.2012.11.020 ↗
30. Effect of surface roughness on low-cycle fatigue behaviors of 316LN stainless steel in borated and lithiated high-temperature pressurized water10.1016/j.corsci.2022.110792 ↗
31. Failure analysis of anion synergy on pitting behavior of liner 316L in sour water system by electrochemical tests10.1016/j.engfailanal.2021.105982 ↗
32. Towards peculiar corrosion behavior of multi-main-phase Nd-Ce-Y-Fe-B permanent material with heterogeneous microstructure10.1016/j.corsci.2020.108972 ↗
33. Rapid fabrication of diamond-like carbon coating with excellent corrosion resistance by low-voltage plasma electrolytic deposition10.1016/j.jnoncrysol.2025.123557 ↗
34. Microstructure, corrosion resistance and formation mechanism of alumina micro-arc oxidation coatings on sintered NdFeB permanent magnets10.1016/j.surfcoat.2016.12.023 ↗
35. (ZrTiHfNi)85Nb15 high-entropy amorphous alloy preparation and APS coating wear and corrosion resistance10.1016/j.jnoncrysol.2025.123536 ↗
36. Corrosion behavior of hot-pressed nanocrystalline NdFeB magnet in a simulated marine atmosphere10.1016/j.corsci.2014.06.021 ↗
37. Long-term effects of electrochemical corrosion on magnetic properties of sintered NdFeB magnets10.1016/j.jmmm.2021.168309 ↗
38. Study on tribological oxide mechanism of CoCrFeNiMo high entropy alloy10.1016/j.wear.2023.204907 ↗
39. Improvement on corrosion resistance of sintered Nd-Fe-B with bilayer Al/Cr thin films10.1016/j.jmmm.2022.170222 ↗
40. Corrosion resistance of sintered NdFeB coated with SiC/Al bilayer thin films by magnetron sputtering10.1016/j.jmmm.2016.02.006 ↗