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Corrosion Behavior of Detonation Gun Sprayed Al Coating on Sintered NFeB

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An Erratum to this article was published on 03 December 2014

Abstract

Pure Al coating was prepared by a detonation gun (D-gun) spraying process to protect sintered NdFeB magnets. The detonation gun sprayed coating is very uniform and has a low porosity of 0.77%. The thickness of the Al coating is approximately 16 μm. The corrosion current density for the coated sample was 1.30 × 10−5 A/cm2 immediately after immersion in 3.5% NaCl solution, compared to 6.54 × 10−5 A/cm2 for the uncoated sample. X-ray photoelectron spectrometry results indicate that the formation of Al2O3 film contributes to the increased corrosion resistance of Al coating. Meanwhile, electrochemical impedance spectroscopy with equivalent electrical circuit was used to ascertain the corrosion process of the Al coatings. Results show the corrosion procedure consists of two stages which agree with the potentiodynamic polarization test. It can be concluded that the Al coating deposited by the D-gun spray process can improve the corrosion resistance of sintered NdFeB.

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Acknowledgment

This work was supported by a grant from the National High Technology Research and Development Program of China under the contract of 2012BAE02B01.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Key Laboratory of Aerospace Materials and Performance (Ministry of Education), Beijing, 100191, China

    Jizhao Ma, Xiaofang Liu & Chungen Zhou

  2. School of Mechanical Engineering, Xi’an Shiyou University, Xi’an, 710065, China

    Wentao Qu

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Correspondence to Chungen Zhou.

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Ma, J., Liu, X., Qu, W. et al. Corrosion Behavior of Detonation Gun Sprayed Al Coating on Sintered NFeB. J Therm Spray Tech 24, 394–400 (2015). https://doi.org/10.1007/s11666-014-0188-9

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