Fabrication of Porous Nb[sub 2]O[sub 5] by Plasma Electrolysis Anodization and Electrochemical Characterization of the Oxide

Norlin, Anna; Pan, Jinshan; Leygraf, Christofer

doi:10.1149/1.2196788

Cited by 20 publications

(10 citation statements)

References 51 publications

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“…CPE takes into account dispersion of capacitance behaviour, which originates from multiple factors, such as multiple layers, adsorption and diffusion processes, surface geometry and presence of intermetallic phases. [48][49][50] This type of model simplication is oen used during impedance monitoring in order to obtain continuous trend of changes over time of exposure, which is required for proper representation of investigated system. [51][52][53] The effective capacitance can be further estimated on the base of CPE using estimation proposed by Hirschorn et al 54,55 While authors tested numerous EEC's, the best trend of changes together with the best t (measured as Chi 2 parameter) was observed for R(QR) circuit (ESI, Fig.…”

Section: Monitoring Open-circuit Potential (E Oc )mentioning

confidence: 99%

Effect of cobalt addition on the corrosion behavior of near equiatomic NiTi shape memory alloy in normal saline solution: electrochemical and XPS studies

et al. 2018

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Section: Monitoring Open-circuit Potential (E Oc )mentioning

confidence: 99%

Effect of cobalt addition on the corrosion behavior of near equiatomic NiTi shape memory alloy in normal saline solution: electrochemical and XPS studies

et al. 2018

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“…The oxide film can be fused and alloyed with elements in the electrolyte. 11 Plasma electrolytic oxidation processes can occur at a high local temperature and pressure in the discharge channels. The oxide coatings generally consist of a porous top layer, dense intermediate layer and thin inner layer.…”

Section: Introductionmentioning

confidence: 99%

Plasma electrolytic oxidation (PEO) for production of anodised coatings on lightweight metal (Al, Mg, Ti) alloys

Walsh¹,

Low²,

Wood³

et al. 2009

Transactions of the IMF

294

107

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The introduction of plasma electrolytic oxidation (PEO) as a surface finishing technique has enabled a range of hard, dense oxide coatings to be produced on aluminium, magnesium, titanium and other lightweight alloy substrates. As with all surface coating technologies, successful development of PEO coatings requires adequate attention to substrate pretreatment together with careful control of electrolyte conditions and process variables. The principles and applications of the PEO coating process are considered, including the fundamentals of oxide deposition, the technology involved and the typical characteristics of the coatings. Industrial applications are considered together with their coating requirements. Plasma electrolytic oxidation coating is a specialised but well developed process. Suitable control of electrolyte and process conditions can realise a novel range of coatings having technologically attractive physical and chemical properties. The development of PEO technology over the last decade has provided coatings having controlled appearance, hardness, corrosion resistance and other tribological properties across an extending range of industrial sectors. Continuing developments are concisely reviewed and the PEO process is illustrated by the characterisation of anodised coatings on an AZ91 magnesium alloy surface.

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“…), which transforms surface layers into oxide ceramic coatings [13,14]. This process was originally called plasma electrolytic oxidation (PEO) [15,16], and somewhat later -anodic spark deposition (ASD) [17]. However, the most frequently used name recently in describing this process is microarc oxidation (MAO) [18,19].…”

Section: Introductionmentioning

confidence: 99%

A study of the phase-structural engineering possibilities of coatings on D16 alloy during micro-arc oxidation in electrolytes of different types

Subbotinа

Sоbоl

Belozerov

et al. 2020

EEJET

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The effect of electrolysis conditions with different electrolyte compositions on the growth kinetics, phase-structural state, and hardness of coatings obtained by microarc oxidation (MAO) on the D16 aluminum alloy (base-aluminum, main impurity Cu) was studied. An analysis of the results obtained showed that the choice of the type of electrolyte and the conditions for the MAO process makes it possible to vary the growth kinetics and phase-structural state of the coating on the D16 aluminum alloy within a wide range. For all types of electrolytes, with an increase in the content of KOH, Na 2 SiO 3 , or KOH+Na 2 SiO 3 , the growth rate of MAO coatings increases. It was found that in MAO coatings obtained in an alkaline (KOH) electrolyte, a two-phase (γ−Al 2 O 3 and α−Al 2 O 3 phases) crystalline state is formed. An increase in the KOH concentration leads to an increase in the relative content of the α-Al 2 O 3 phase (corundum). During the formation in a silicate electrolyte, the phase composition of MAO coatings with an increase in the content of liquid glass (Na 2 SiO 3) changes from a mixture of the γ−Al 2 O 3 phase and mullite (3Al 2 O 3 •2SiO 2) to an X-ray amorphous phase. The use of a complex electrolyte leads to a two-phase state of the coating with a large (compared to an alkaline electrolyte) shift of the γ−Al 2 O 3 →α−Al 2 O 3 transformation towards the formation of the α−Al 2 O 3 phase. It was determined that the value of hardness correlates with the content of the α−Al 2 O 3 phase in the MAO coating, reaching the maximum value of 1620 kg/mm 2 at the highest content (about 80 vol. %) of the α−Al 2 O 3 phase. Two types of dependences of the coating thickness on the amount of electricity passed were revealed. For the amount of passed electricity 10-50 A-h/dm 2 , the thickness dependence is determined as 4.2 µm/(A-h/dm 2), which suggests the basic mechanism of electrochemical oxidation during the formation of a coating. For the amount of electricity transmitted 50-120 A-hour/ dm 2 , the thickness dependence is determined by a much smaller value of 1.1 µm/(A-hour/dm 2). This suggests a transition to a different mechanism of coating formation − the formation of a coating with the participation of electrolysis components

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Fabrication of Porous Nb[sub 2]O[sub 5] by Plasma Electrolysis Anodization and Electrochemical Characterization of the Oxide

Cited by 20 publications

References 51 publications

Effect of cobalt addition on the corrosion behavior of near equiatomic NiTi shape memory alloy in normal saline solution: electrochemical and XPS studies

Effect of cobalt addition on the corrosion behavior of near equiatomic NiTi shape memory alloy in normal saline solution: electrochemical and XPS studies

Plasma electrolytic oxidation (PEO) for production of anodised coatings on lightweight metal (Al, Mg, Ti) alloys

A study of the phase-structural engineering possibilities of coatings on D16 alloy during micro-arc oxidation in electrolytes of different types

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