Journal
CHEMICAL ENGINEERING JOURNAL
Volume 368, Issue -, Pages 331-339Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.02.126
Keywords
NdFeB; Corrosion inhibition; Magnetic fluid; Dopamine; Self-healing
Categories
Funding
- National Natural Science Foundation of China [41576079]
- Qingdao National Laboratory for Marine Science and Technology [QNLM2016ORP0413]
- Natural Science Foundation of Shandong Province [ZR2017MF054]
- Shandong Provincial Education Association for International Exchanges
Ask authors/readers for more resources
Finding durable coating onto NdFeB magnetic material is critical for its usage in harshly corrosive environment. In this report, to the best of our knowledge, magnetic fluid is proposed as the versatile coating to prohibit the corrosion of magnetic material for the first time. Mussel inspired chemistry for polydopamine coating and Michael reaction with addition of dodecanethiol lead to hydrophobic/superoleophilic nanostructured Fe3O4, which is utilized to prepare magnetic fluid. The spontaneous attraction force between NdFeB and magnetic fluid enables fluid as the coating to cover the magnet surface, showing exceptional inhibition effect to underneath metal. When immersed in 3.5 wt% NaCl solution for 30 days, corrosion current density of NdFeB covered with magnetic fluid is only 1.74x10(-3) mA/cm(2), which is approximately three orders of magnitude lower than that of bare NdFeB with corrosion current density 1.01 mA/cm(2). Even after exposure for 8 days in more severe condition acidic, salt spray environment, magnetic fluid achieves the corrosion current density of 1.31x10(-3) mA/cm(2) without the occurrence of corrosion. In contrast, thick rust layer has formed on bare NdFeB during the same exposure period. Moreover, magnetic fluid covering on NdFeB behaves excellent self-healing property. Even being abraded and cut for multiple times, magnetic fluid still performs prominent corrosion inhibition to NdFeB, illustrating exceptional resistance to external mechanical damage.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available