Journal
JOURNAL OF THERMAL SPRAY TECHNOLOGY
Volume 23, Issue 3, Pages 456-462Publisher
SPRINGER
DOI: 10.1007/s11666-013-9994-8
Keywords
cold spray; EIS; metal coatings; passive films; pitting corrosion
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Funding
- National High Technology Research and Development Program of China [2012BAE02B01]
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A protective Al coating was achieved on the sintered NdFeB magnet by cold spray. The sprayed Al particles generate plastic deformation and hang together. The thickness of the coating is about 170 mu m. The corrosion currents of Al coating and NdFeB without immersion tested by potentiodynamic polarization in 3.5 wt.% NaCl solutions are 1.350 x 10(-6) and 4.361 x 10(-6) A/cm(2), respectively. X-ray photoelectron spectrometry results confirm that the oxide film is Al2O3 and the corrosion process can be derived into two different stages. The Al coating can provide long-term protection for NdFeB effectively.
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