Electrophoretic deposition of graphene oxide as a corrosion inhibitor for sintered NdFeB

He, Wenting; Zhou, Liqun; Chen, Haining; Nan, Haiyan; Li, Weiping; Liu, Huicong; Wang, Yan

doi:10.1016/j.apsusc.2013.04.130

Cited by 126 publications

(39 citation statements)

References 32 publications

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“…A reduction process in principle occurs on the cathode [58]. However, as seen in the example above, the 'reduction' of GO has also been observed to occur on the anode surface during anodic EPD processes, leading to production of reduced GO films [9,40,49,79,136,137]. The extent of reduction does not depend on deposition time [49], but is mainly controlled by voltage.…”

Section: Epd-based Reduction Mechanism Of Gomentioning

confidence: 99%

“…In addition, other effects may also contribute specifically for GRMs, including the removal of oxide groups by GO 'reduction' processes that may happen at either anode or cathode (see Section 5). A further possible scenario, at the anode, is the dissolution of metallic ions from the electrode, contributing to the charge neutralisation effects and, if multi-valent, cross-linking of GO sheets can occur through multiply coordinated carboxylates [49].…”

Section: Mechanisms Of Deposit Formationmentioning

confidence: 99%

“…Most of the studies have suggested that GRM particle charge neutralisation at the working electrode surface is the core process that leads to deposit formation. For example, GO dispersions are generally stabilised electrostatically by the charge remaining on the conjugate base of ionised acidic surface oxides; during EPD, water electrolysis at the anode can lead to local acidification, (re)protonation of the charged groups and a loss of stabilising repulsion [49]. Depending on the initial pH of the GO suspension (net initial charge of the GO sheets), deposit formation can be induced on either anode or the cathode, with both options attributed to charge neutralization mechanism [79].…”

Section: Mechanisms Of Deposit Formationmentioning

confidence: 99%

See 2 more Smart Citations

Electrophoretic deposition of graphene-related materials: A review of the fundamentals

Diba

Fam

Boccaccını

et al. 2016

Progress in Materials Science

228

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The Electrophoretic Deposition (EPD) of graphene-related materials (GRM) is an attractive strategy for a wide range of applications. This review paper provides an overview of the fundamentals and specific technical aspects of this approach, highlighting its advantages and limitations. Since obtaining a stable dispersion of charged particles is a pre-requisite for successful EPD, the strategies for suspending GRM in different media are discussed, along with the resulting influence on the deposited film. Most importantly, the kinetics involved in the EPD of GRMs and the factors that cause deviation from linearity in Hamaker's Law are reviewed. Side reactions often influence both efficiency and the nature of the deposited material; examples include the reduction of graphene oxide (GO) and related materials, as well as the decomposition of the suspension medium at high potentials. The microstructural characteristics of GRM deposits, and their degree of reduction, strongly influence their performance in their intended function. These factors will also determine, to a large extent, the commercial potential of this technique for applications involving GRM, and are therefore discussed here.

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Section: Epd-based Reduction Mechanism Of Gomentioning

confidence: 99%

Section: Mechanisms Of Deposit Formationmentioning

confidence: 99%

Section: Mechanisms Of Deposit Formationmentioning

confidence: 99%

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Electrophoretic deposition of graphene-related materials: A review of the fundamentals

Diba

Fam

Boccaccını

et al. 2016

Progress in Materials Science

228

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“…These advantages have prompted interest to develop water based graphene oxide coating by EPD. There have been several reports on the use of EPD technique for producing graphene coating for corrosion prevention [31][32][33][34][35][36][37][38]. Although uniform layer of graphene nano-sheet have been deposited via this technique, they have reported wide variation in corrosion prevention.…”

Section: Methodsmentioning

confidence: 99%

Graphene Coating on Copper by Electrophoretic Deposition for Corrosion Prevention

et al. 2017

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Abstract:In this paper, we report the use of a simple and inexpensive electrophoretic deposition (EPD) technique to develop thin, uniform, and transparent graphene oxide (GO) coating on copper (Cu) substrate on application of 10 V for 1 s from an aqueous suspension containing 0.03 wt % graphene oxide. GO was partially reduced during the EPD process itself. The GO coated on Cu was completely reduced chemically by using sodium borohydride (NaBH 4 ) solution. The coatings were characterized by field emission scanning electron microscope (FESEM), Raman spectroscopy, Fourier-transform infrared spectroscopy (FTIR), XRD, and UV/VIS spectrophotometry. Corrosion resistance of the coatings was evaluated by electrochemical measurements under accelerated corrosion condition in 3.5 wt % NaCl solution. The GO coated on Cu and chemically reduced by NaBH 4 showed more positive corrosion potential (E corr ) (−145.4 mV) compared to GO coated on Cu (−182.2 mV) and bare Cu (−235.3 mV), and much lower corrosion current (I corr ) (7.01 µA/cm 2 ) when compared to 15.375 µA/cm 2 for bare Cu indicating that reduced GO film on copper exhibit enhanced corrosion resistance. The corrosion inhibition efficiency of chemically reduced GO coated Cu was 54.40%, and its corrosion rate was 0.08 mm/year as compared to 0.18 mm/year for bare copper.

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“…In literature, numerous attempts are described in order to obtain an improvement of NdFeB magnets' durability, such as deposition of different coatings or the addition of alloying elements to the metal matrix [8][9][10]. Nevertheless, the methods proposed often deteriorate the magnetic properties and the adopted protective coatings still require an optimization for long-time applications.…”

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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Electrophoretic deposition of graphene oxide as a corrosion inhibitor for sintered NdFeB

Cited by 126 publications

References 32 publications

Electrophoretic deposition of graphene-related materials: A review of the fundamentals

Electrophoretic deposition of graphene-related materials: A review of the fundamentals

Graphene Coating on Copper by Electrophoretic Deposition for Corrosion Prevention

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

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