Influence of electrolyte ageing on the Plasma Electrolytic Oxidation of aluminium

Martin, Julien; Leone, Pierluigi; Nominé, Alexandre; Veys‐Renaux, Delphine; Henrion, G.; Belmonte, T.

doi:10.1016/j.surfcoat.2014.11.001

Cited by 53 publications

(30 citation statements)

References 30 publications

(44 reference statements)

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“…Secondly, the complex surface of the coating, such as multilayer and porous structure, is beneficial to increase the specific area of the coatings, which is a crucial factor for the improvement of the optical properties. Furthermore, the component and structure of PEO coating can be easily adjusted by changing the technical parameters during the reaction process such as reaction time, voltage, and components of electrolytes …”

Section: Introductionmentioning

confidence: 98%

Black ceramic coatings on Ti alloy with enhanced high absorptivity and high emissivity by plasma electrolytic oxidation

Yao

Han

et al. 2019

Int J Applied Ceramic Tech

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A black ceramic coating with high absorptivity and emissivity was successfully prepared on TA7 (Ti‐5Al‐2.5Sn) in a hybrid electrolyte solution by plasma electrolytic oxidation for improving the imaging precision of optical system. The influence of electrolyte components and technical parameters on the composition, structure, and optical properties was investigated. The results show the coatings with typically porous structure are mainly composed of O, P, Si, Ti, V, Fe, and Ni. The corresponding amorhous oxide in the outer layer endows the coating with strong absorption in the visible light and infrared areas, and the crystallized TiO2 indwelling the inner layer contributes to the strong UV absorption property. In addition, the micropores of the coatings have different size ranges corresponding to the wavelengths, facilitating the increase of absorptivity and emissivity in some degree. The absorptivity and emissivity can be adjusted by electrolyte components and technical parameters. The coating presents the best absorptivity of 0.962 and emissivity of 0.950 in the electrolyte solution of 3 g/L NH4VO3, 5 g/L FeSO4, and 5 g/L C4H6O4Ni under 400 V for 10 minutes.

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Section: Introductionmentioning

confidence: 98%

Black ceramic coatings on Ti alloy with enhanced high absorptivity and high emissivity by plasma electrolytic oxidation

Yao

Han

et al. 2019

Int J Applied Ceramic Tech

View full text Add to dashboard Cite

show abstract

“…Therefore, increasing the thickness and reducing the porosity of MAO coatings are two effective methods of enhancing the anti-corrosion properties of these coatings. Many factors can affect the thickness and porosity of MAO coatings, such as elements in the metal substrate [16,17], compositions of the electrolyte [18][19][20], processing time [21,22], processing temperature [23], current density [24][25][26], the type of power source [27][28][29], and other process assistance methods [30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Binary Additives Enhance Micro Arc Oxidation Coating on 6061Al Alloy with Improved Anti-Corrosion Property

et al. 2020

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Given the corrosion tendency of the natural oxide film of aluminum alloys, micro arc oxidation (MAO) treatment is used as an efficient and economic method to enhance the corrosion resistance. However, irregular voids, pores, and micro cracks are easily formed during the MAO process, which are harmful to the anti-corrosion property of MAO coatings. In this paper, binary additives of electrolytes, including (NaPO 3 ) 6 and H 3 BO 3 , were used to obtain MAO coatings with improved thickness and compact microstructures on 6061 aluminum alloys. The as-prepared coatings were investigated using a thickness meter, scanning electron microscope (SEM), X-ray diffractometer (XRD), and electrochemical impedance spectroscope (EIS). The results showed that the coordinated influence of the binary additives could change the discharge behaviors and micro morphologies of the MAO coatings compared to the base silicate electrolyte. A thicker and stronger MAO coating could be achieved, which was mainly composed of Al 2 O 3 phases. The EIS tests revealed that the corrosion current density of the obtained optimal MAO coating decreased by three orders of magnitude from 1.209 × 10 −6 A·cm −2 to 2.981 × 10 −9 A·cm −2 . We believe that the binary additive-enhanced MAO coatings could provide a promising anti-corrosion solution in various applications.

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“…PEO is a complex process that combines the diffusion of elements in electrolyte with electrophoresis, ion transport in discharge channels, and electrochemical oxidation at the metal surface [9][10][11]. In this process, there are inevitable phenomena such as the discharging process, the solidification process, mechanical stresses, and gas evolution.…”

Section: Introductionmentioning

confidence: 99%

Influence of Sealing Treatment on the Corrosion Resistance of PEO Coated Al-Zn-Mg-Cu Alloy in Various Environments

et al. 2019

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In the present work, a coating was prepared on an Al alloy substrate by plasma electrolytic oxidation (PEO). To seal the micro defects in the oxide scale, a siloxane layer was prepared on the PEO coating by sol gel method. The polymer sealant was synthesized from Tetraethoxy silane (TEOS) and methacryloxy propyl trimethoxyl silane (MPTES). The chemical structure of the polymer was studied by Fourier transform infrared spectroscopy (FTIR). The morphologies and microstructure of the PEO coating and siloxane coating were investigated by scanning electron microscopy (SEM). The results showed that siloxane formed a continuous layer on the surface and effectively sealed the micro defects. The corrosion behavior of the coatings in three different corrosion solutions (NaCl, HCl, and NaOH) was examined by electrochemical impedance spectroscopy and potentiodynamic polarization. The corrosion resistance of the sealed coatings was superior to that of the PEO coating because it prevented the penetration of corrosive solutions. The corrosion resistance of the sealed coatings was found to decrease with increasing electrolyte concentration. The work demonstrated that siloxane sealing may greatly enhance the corrosion resistance of Al-based PEO coating in acidic, neutral, and alkaline environments.

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Influence of electrolyte ageing on the Plasma Electrolytic Oxidation of aluminium

Cited by 53 publications

References 30 publications

Black ceramic coatings on Ti alloy with enhanced high absorptivity and high emissivity by plasma electrolytic oxidation

Black ceramic coatings on Ti alloy with enhanced high absorptivity and high emissivity by plasma electrolytic oxidation

Binary Additives Enhance Micro Arc Oxidation Coating on 6061Al Alloy with Improved Anti-Corrosion Property

Influence of Sealing Treatment on the Corrosion Resistance of PEO Coated Al-Zn-Mg-Cu Alloy in Various Environments

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