Improving the corrosion resistance of NdFeB magnets: an electrochemical and surface analytical study

Saliba-Silva, Adonis Marcelo; Faria, Rubens Nunes de; Baker, Mark; Costa, Isolda

doi:10.1016/j.surfcoat.2003.12.015

Cited by 54 publications

(20 citation statements)

References 28 publications

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“…In particular, in orthodontic field, magnet applications have been included in space closures, extrusion of damaged teeth, eruption of impacted teeth, and similar applications. The interest in magnetic orthodontic systems was due to the need of generating a continuous and low intensity force in order to obtain biological teeth movements, such as tipping, movement, straightening root, rotation, extrusion, and intrusion [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Corrosion Behaviour of a Silane Protective Coating for NdFeB Magnets in Dentistry

Calabrese

Caprì

Fabiano

et al. 2015

International Journal of Corrosion

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The corrosion behavior of coated and uncoated Ni/Cu/Ni rare earth magnets was assessed at increasing steps with a multilayering silanization procedure. Magnets' durability was analyzed in Fusayama synthetic saliva solution in order to evaluate their application in dental field. Corrosion performance was evaluated by using polarization and electrochemical impedance spectroscopy in synthetic saliva solution up to 72 hours of continuous immersion. The results show that the addition of silane layers significantly improved anticorrosion properties. The coating and aging effects, in synthetic saliva solution, on magnetic field were evaluated by means of cyclic force-displacement curves.

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Section: Introductionmentioning

confidence: 99%

Corrosion Behaviour of a Silane Protective Coating for NdFeB Magnets in Dentistry

Calabrese

Caprì

Fabiano

et al. 2015

International Journal of Corrosion

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“…In order to improve the corrosion resistance of the sintered NdFeB magnet, numerous attempts have been made, such as alloy additions and surface treatment [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20], among which the electroplating of metal coatings is one of the most popular methods. As a traditional surface treatment technique, electroplating of metal coatings has been brought for surface modification of many metals such as Al, Fe, NdFeB, Mg, etc.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical corrosion behaviors and protective properties of Ni–Co–TiO₂ composite coating prepared on sintered NdFeB magnet

Yang

Zhang

et al. 2010

Materials & Corrosion

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In this paper, a protective Ni-Co-TiO 2 composite coating was prepared on the sintered NdFeB magnet by direct current electrodeposition. The surface morphologies, microstructure, and chemical composition of the composite coating were studied using scanning electron microscope (SEM), X-ray diffraction (XRD), and energy dispersive spectroscopy (EDS), respectively. The surface morphologies and microstructure analysis showed that the composite coating possessed cauliflower-like grain colonies, and formed face-centered cubic (fcc) solid solution. The electrochemical corrosion behaviors of the composite coating in 0.5 mol/L H 2 SO 4 , 0.6 mol/L NaOH, 0.6 mol/L Na 2 SO 4 , and neutral 3.5 wt% NaCl solutions were evaluated by potentiodynamic polarization measurements and electrochemical impedance spectroscopy (EIS), showing good protection for NdFeB magnet. In order to further investigate the protective properties of the composite coating for NdFeB magnet and the practicability of the composite coating, the long-term immersion test was carried out in neutral 3.5 wt% NaCl solutions using EIS. The results of long-term corrosion test showed that the Ni-Co-TiO 2 composite coating could provide long-term protection in neutral 3.5 wt% NaCl solutions for NdFeB magnet.

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“…The poor corrosion resistance of NdFeB comes from its multiphase microstructure consisting of matrix phase Nd 2 Fe 14 B, Nd-rich phase, and B-rich phase [4]. The more active Nd-rich phase and B-rich phase are prone to fall away from the substrate surface due to galvanic corrosion, and then the magnetic properties of NdFeB are deteriorated [5]. Thus, it is important to make clear the corrosion behavior of NdFeB so as to increase the lifetime.…”

Section: Introductionmentioning

confidence: 99%

A comparative study on the corrosion behavior of NdFeB magnets in different electrolyte solutions

Song

Zhang

Yang

et al. 2008

Materials & Corrosion

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Sintered NdFeB magnets possess excellent magnetic properties. However, the corrosion resistance property of NdFeB is very poor due to its multiphase microstructure consisting of matrix phase Nd 2 Fe 14 B, Nd-rich phase, and B-rich phase. The corrosion behavior of NdFeB magnets in sodium hydroxide (NaOH), sodium chloride (NaCl), nitric acid (HNO 3 ), and oxalic acid (H 2 C 2 O 4 ) solutions was investigated by immersion and electrochemical tests. HNO 3 is the strongest corrosive electrolyte compared with the other three solutions. The increase in HNO 3 concentration can accelerate the corrosion of NdFeB magnets. NaCl belongs to medium corrosion electrolyte. A NaCl concentration of 0.5 M shows the severest corrosive feature in comparison with other concentrations of NaCl solution. NdFeB hardly suffers corrosion in NaOH and H 2 C 2 O 4 solutions owing to the formation of passivation films on the surface of magnets. Based on the corrosion behavior of NdFeB in different electrolytes, the possible corrosion mechanisms are discussed.

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Improving the corrosion resistance of NdFeB magnets: an electrochemical and surface analytical study

Cited by 54 publications

References 28 publications

Corrosion Behaviour of a Silane Protective Coating for NdFeB Magnets in Dentistry

Corrosion Behaviour of a Silane Protective Coating for NdFeB Magnets in Dentistry

Electrochemical corrosion behaviors and protective properties of Ni–Co–TiO₂ composite coating prepared on sintered NdFeB magnet

A comparative study on the corrosion behavior of NdFeB magnets in different electrolyte solutions

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Improving the corrosion resistance of NdFeB magnets: an electrochemical and surface analytical study

Cited by 54 publications

References 28 publications

Corrosion Behaviour of a Silane Protective Coating for NdFeB Magnets in Dentistry

Corrosion Behaviour of a Silane Protective Coating for NdFeB Magnets in Dentistry

Electrochemical corrosion behaviors and protective properties of Ni–Co–TiO2 composite coating prepared on sintered NdFeB magnet

A comparative study on the corrosion behavior of NdFeB magnets in different electrolyte solutions

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Electrochemical corrosion behaviors and protective properties of Ni–Co–TiO₂ composite coating prepared on sintered NdFeB magnet