The study of plasma electrolytic oxidation coatings on Zr and Zr-1% Nb alloy at thermal cycling

Apelfeld, A. V.; Борисов, А. М.; Крит, Б. Л.; Ludin, V. B.; Polyansky, M. N.; Romanovsky, E. A.; Савушкина, С. В.; Суминов, И. В.; Tkachenko, N. V.; Виноградов, А. В.; Vostrikov, V. G.

doi:10.1016/j.surfcoat.2015.02.039

Cited by 35 publications

(14 citation statements)

References 19 publications

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“…Zirconium (Zr) and zirconium-based materials have gained some interest for biomedical and dental applications due to their chemical and dimensional stability, high flexural strength, fracture toughness, corrosion resistance, and good biocompatibility [1][2][3][4][5][6][7]. In addition, the lower elastic modulus of Zr and Zr-based alloys makes them potential alternatives to titanium-based implant materials [8,9].…”

Section: Introductionmentioning

confidence: 99%

Direct fabrication of crystalline hydroxyapatite coating on zirconium by single-step plasma electrolytic oxidation process

Cengiz

Uzunoğlu

Stanciu

et al. 2016

Surface and Coatings Technology

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Section: Introductionmentioning

confidence: 99%

Direct fabrication of crystalline hydroxyapatite coating on zirconium by single-step plasma electrolytic oxidation process

Cengiz

Uzunoğlu

Stanciu

et al. 2016

Surface and Coatings Technology

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“…Before analysis, the researched areas of the coatings were purified by argon ions, with an energy of 2 keV. The elemental depth profile of the coatings was nondestructively determined by proton nuclear backscattering (NBS) spectrometry using the 120 cm cyclotron of the Skobeltsyn Institute of Nuclear Physics of Moscow State University [13,32]. The proton-beam energy was 7.4 MeV, the beam diameter was 3 mm, and the scattering angle was 160 • .…”

Section: Methodsmentioning

confidence: 99%

“…These problems can be solved by the formation of ceramic-like coatings by plasma electrolytic oxidation (PEO) [10][11][12]. It is known that PEO coatings have high corrosion-protective ability, wear resistance, and heat resistance [10][11][12][13][14][15][16][17][18][19]. PEO technology is well developed for compact aluminum alloys.…”

Section: Introductionmentioning

confidence: 99%

Study of Plasma Electrolytic Oxidation Coatings on Aluminum Composites

Агуреев¹,

Савушкина

Ашмарин³

et al. 2018

Metals

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Coatings, with a thickness of up to 75 µm, were formed by plasma electrolytic oxidation (PEO) under the alternating current electrical mode in a silicate-alkaline electrolyte on aluminum composites without additives and alloyed with copper (1-4.5%). The coatings' structure was analyzed by scanning electron microscopy, X-ray microanalysis, X-ray photoelectron spectroscopy, nuclear backscattering spectrometry, and XRD analysis. The coatings formed for 60 min were characterized by excessive aluminum content and the presence of low-temperature modifications of alumina γ-Al 2 O 3 and η-Al 2 O 3. The coatings formed for 180 min additionally contained high-temperature corundum α-Al 2 O 3 , and aluminum inclusions were absent. The electrochemical behavior of coated composites and uncoated ones in 3% NaCl was studied. Alloyage of aluminum composites with copper increased the corrosion current density. Plasma electrolytic oxidation reduced it several times.

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“…Such coatings should be uniform, pore free, relatively thick, hard, well adhered, flexible to withstand an overload and insulating to minimize corrosion. Plasma electrolytic oxidation (PEO) fulfils most of these requirements and has been used for depositing a well adhered ceramic coating on light-weight metals (Mg, Al, Ti, Zr) that provides not only corrosion protection but also enhanced wear properties, hardness and toughness with better thermal stability and dielectric properties [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Plasma electrolytic oxidation coatings on Mg-alloys for improved wear and corrosion resistance

Hussein¹,

Nie²,

Northwood³

2017

WIT Transactions on State-of-the-Art in Science and Engineering

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Due to their high chemical reactivity, relatively low melting point and low hardness, magnesium and magnesium alloys have relatively poor corrosion and wear resistance. Since both corrosion and wear are surface phenomena, a number of surface engineering techniques have been used to improve corrosion and wear performance. Whilst some surface hardening/strengthening methods have led to improvements in wear properties, they have not, in themselves, significantly improved the corrosion performance. Plasma electrolytic oxidation (PEO) has the potential to produce hard, compact oxide coatings that are well adhered to the magnesium alloy substrate. Such coatings can provide both improved wear and corrosion resistance. In this contribution, it is shown how the nature of the PEO oxide coatings (thickness, microstructure, porosity, phase content, composition) can be changed by changing the PEO processing parameters (substrate alloy, electrolyte, current or voltage, processing time); this, in turn, effects the corrosion and wear performance. All PEO-coatings have a three-layer structure with a porous outer layer, an intermediate dense layer and a thin inner dense layer. From a corrosion aspect, the performance of coatings is determined by the time taken for corrosion to initiate since this is much shorter than the time taken for the coating to degrade. For PEO-coated Mg-alloys, this initiation time is primarily determined by the thickness, porosity and phase content of the inner dense layer at the coating/substrate interface. With respect to tribological properties, the coefficient of friction (COF) in dry sliding wear increases with increasing surface roughness of the PEO coatings. The wear rate is primarily determined by the thickness and hardness of the intermediate dense layer. Coatings containing less

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The study of plasma electrolytic oxidation coatings on Zr and Zr-1% Nb alloy at thermal cycling

Cited by 35 publications

References 19 publications

Direct fabrication of crystalline hydroxyapatite coating on zirconium by single-step plasma electrolytic oxidation process

Direct fabrication of crystalline hydroxyapatite coating on zirconium by single-step plasma electrolytic oxidation process

Study of Plasma Electrolytic Oxidation Coatings on Aluminum Composites

Plasma electrolytic oxidation coatings on Mg-alloys for improved wear and corrosion resistance

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