Corrosion behaviour of sintered NdFeB coated with Al/Al2O3 multilayers by magnetron sputtering

Mao, Shipeng; Yang, Hui; Huang, Feng; Xie, Ting; Zhang, Song

doi:10.1016/j.apsusc.2010.11.162

Cited by 49 publications

(20 citation statements)

References 30 publications

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“…The vacancies and defects in the aluminide layers may be masked by the Al 2 O 3 , preventing the micropores from penetrating. 25 In addition, Al 2 O 3 particles promote passivating film to form on the top of iron aluminide. The passivating film can keep the active metals away from the electrolyte and improve the corrosion resistance of the composite coatings.…”

Section: Corrosion Resistancementioning

confidence: 99%

Al₂O₃ reinforced Fe–Al composite coatings prepared by double glow discharge technique

Wang

Lin

Guo

et al. 2013

Surface Engineering

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particles reinforced iron aluminide coatings (Fe-Al coatings) were prepared on the surface of 316L stainless steel at only 580uC by a novel approach, namely double glow discharge technique. The chemical composition and morphology of the coatings were characterised by means of glancing angle (1u) X-ray diffractometry, X-ray photoelectron spectroscopy and scanning electron microscopy (SEM) respectively. The hardness, wear and corrosion behaviours of the aluminide coatings were also evaluated. The results indicated that the aluminide coatings exhibited a good wear and corrosion resistance since Al 2 O 3 particles were well distributed in the coatings. The friction coefficient of the composite coatings increased first and then decreased with the increment of Al 2 O 3 particles, meanwhile the corrosion potential and microhardness tended to increase. Finally, the wear mechanisms of the coatings were discussed. IntroductionIron aluminides are candidates for sustainable materials that are very suitable for thermal applications, since they have excellent corrosion properties, high strength and excellent oxidation resistance at elevated temperature. 1 Unfortunately, the high intrinsic brittleness of aluminides limits their usage as a bulk material. Thus, the aluminides are normally used as coatings for their industrial applications. 2 Furthermore, it provides prospective surface properties to strengthen aluminides with dispersed second phase particulates as metal matrix composites (MMCs) coatings. 3,4 Nanocrystalline Al 2 O 3 particulates have unique advantages in comparison to carbides and borides such as high oxidation resistance, chemical inertness and excellent abrasion resistance. 5 Therefore, Al 2 O 3 reinforced aluminides coatings come into prominence as a potential solution to improving the surface properties of stainless steel (SS) under extreme circumstances as anticorrosion and tritium permeation barriers in a flowing Pb-15?7Li environment in nuclear reactors. 6 For decades, a large number of investigations have been focused on the reinforcement of iron aluminides with Al 2 O 3 in different methods. Aluminides (FeAlFe 3 Al) reinforced with 4-9 vol.-% a-Al 2 O 3 dispersions by sintering can gain higher fracture toughness and bending strength. 7 Moreover, FeAl-Al 2 O 3 composites can be prepared via milling of Fe 2 O 3 and Al powders mixture and annealing at 1000uC for 6 h. 8 Hot dip aluminising and electrospark deposition are also effective methods to prepare Fe-Al coatings. 9,10 However, extremely high preparation temperature threatens the properties of substrate materials. In addition, the properties of the coatings are negatively influenced by porous and rough surfaces. 10 Hence, it becomes a key issue to investigate new methods to prepare Fe-Al composite coatings in order to decrease the preparation temperature and improve the surface quality. The advanced double glow discharge technique, which is different from the conventional methods mentioned above, can be adopted to achieve the goal. 11 In this process, ...

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Section: Corrosion Resistancementioning

confidence: 99%

Al₂O₃ reinforced Fe–Al composite coatings prepared by double glow discharge technique

Wang

Lin

Guo

et al. 2013

Surface Engineering

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“…As an environment friendly technique, PVD including evaporation [16], ion vapour deposition (IVD) [17], and magnetron sputtering have been applied in industry [18,19]. Al coatings prepared by PVD are suitable for corrosion protection [20,21] and do not change the magnetic properties of the magnet [22,23]. However, the coating prepared by evaporation always exhibit defects in the form of micropores, whereas the coating prepared through IVD tend to exhibit large granulated inclusions and columnar structures, which could lead to perpendicular gaps [24].…”

Section: Introductionmentioning

confidence: 99%

Microstructures of Al coatings prepared through magnetron co-sputtering with microcrystalline Ti doping

Zhang

Cui

Wang

et al. 2022

J. Phys.: Conf. Ser.

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Sintered NdFeB magnets are being utilised in numerous applications because of the excellent magnetic properties. However, due to its main components are Fe, B and rare earth metals. There is a potential difference between the neodymium rich phase, boron rich phase and the main phase, which was very easy to form a primary battery and cause electrochemical corrosion on the surface of the material. After the materials are easy to be corroded or the components and structures change, the performance of the materials will become weak or even lost, which will affect the service performance and life of the devices or equipment. According to the requirements of surface protection technology for NdFeB magnets, the preparation of protective coating by magnetron sputtering was an efficient means to enhance the corrosion resistance of magnets. Pure Al coating was deficient in microstructure, hardness and corrosion resistance, and the preparation of composite coating by doping co-sputtering had become a development trend. In the current work, AlTi coatings with various Ti contents were prepared from an Al target and a Ti target using direct and radio frequency hybrid magnetron co-sputtering. The surface morphology, microstructure, and elemental compositions of the AlTi coatings were explored through XRD (X-ray diffraction), SEM (scanning electron microscopy), and EDS (energy dispersive spectroscopy). The anticorrosion performances of the AlTi coatings were evaluated by performing electrochemical tests. According to SEM and EDS, the AlTi composite coating was denser and more homogeneous than that of the Al single layer. Furthermore, the results demonstrated that microcrystalline Ti doping reduced the grain size of Al coatings. Therefore, the corrosion current density of the sintered NdFeB magnets plated with Al(120w)/Ti(10w) was approximately more than a hundred times inferior to that of the pure Al layer, and the hardness of AlTi composite coatings also improved.

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“…Most of these methods (except the polyol method) use an oxygen‐free atmosphere to synthesize NS films to minimize the concern of oxidation of these materials. Particularly, MS technique is broadly used as the convenient method for the fast, eco‐friendly, and easy deposition of the thin films with superior adhesion . However, the frequently reported techniques for the synthesis of NS noble metal films are mainly chemical based and utilize the bottom‐up (where atomic level precursors are utilized to synthesize nanostructured materials) approach involving multi‐step process .…”

Section: Introductionmentioning

confidence: 99%

Direct synthesis of magnetron sputtered nanostructured Cu films with desired properties via plasma chemistry for their efficient antibacterial application

Kim

Sahu

Xiang

et al. 2018

Plasma Processes & Polymers

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By changing the power density, the microstructure, surface morphology, surface energy, and electrical conductivity of the magnetron sputtered Cu films are tuned at a fixed Cu atomic content and the amount of Cu ion release. Data reveals that films with good crystallinity, low surface roughness, minimum surface energy, and the lowest electrical resistivity have shown a strong antibacterial response of Gram-positive bacteria Staphylococcus aureus up to 90-96%. The correlation between the plasma chemistry and film properties is established to investigate the optimized film properties. A possible mechanism is hypothesized to elucidate the observed antibacterial property from the viewpoint of charge transfer.

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Corrosion behaviour of sintered NdFeB coated with Al/Al2O3 multilayers by magnetron sputtering

Cited by 49 publications

References 30 publications

Al₂O₃ reinforced Fe–Al composite coatings prepared by double glow discharge technique

Al₂O₃ reinforced Fe–Al composite coatings prepared by double glow discharge technique

Microstructures of Al coatings prepared through magnetron co-sputtering with microcrystalline Ti doping

Direct synthesis of magnetron sputtered nanostructured Cu films with desired properties via plasma chemistry for their efficient antibacterial application

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Corrosion behaviour of sintered NdFeB coated with Al/Al2O3 multilayers by magnetron sputtering

Cited by 49 publications

References 30 publications

Al2O3 reinforced Fe–Al composite coatings prepared by double glow discharge technique

Al2O3 reinforced Fe–Al composite coatings prepared by double glow discharge technique

Microstructures of Al coatings prepared through magnetron co-sputtering with microcrystalline Ti doping

Direct synthesis of magnetron sputtered nanostructured Cu films with desired properties via plasma chemistry for their efficient antibacterial application

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Al₂O₃ reinforced Fe–Al composite coatings prepared by double glow discharge technique

Al₂O₃ reinforced Fe–Al composite coatings prepared by double glow discharge technique