Preparation of black PEO layers on Al–Si alloy and the colorizing analysis

Kang, Li; Li, Wenfang; Zhang, Guoge; Guo, Ping

doi:10.1016/j.vacuum.2014.10.008

Cited by 41 publications

(10 citation statements)

References 18 publications

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“…It is well known that the PEO process is well suited to tailoring of conditions so as to control the colour of the coating. There are reports of conditions that generate colours of yellow [119], green [120], grey [121], red [122], blue [123] and black [124][125][126], among many others. There has also been work [127] on the reflection characteristics of PEO coatings in the IR part of the spectrum.…”

Section: Thermal and Optical Propertiesmentioning

confidence: 99%

A review of recent work on discharge characteristics during plasma electrolytic oxidation of various metals

Clyne

Troughton

2018

International Materials Reviews

416

225

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The review describes recent progress on understanding and quantification of the various phenomena that take place during plasma electrolytic oxidation, which is in increasing industrial use for production of protective coatings and other surface treatment purposes. A general overview of the process and some information about usage of these coatings are provided in the first part of the review. The focus is then on the dielectric breakdown that repeatedly occurs over the surface of the work-piece. These discharges are central to the process, since it is largely via the associated plasmas that oxidation of the substrate takes place and the coating is created. The details are complex, since the discharge characteristics are affected by a number of processing variables. The interrelationships between electrical conditions, electrolyte composition, coating microstructure and rates of growth, which are linked via the characteristics of the discharges, have become clearer over recent years and these improvements in understanding are summarised here. There is considerable scope for more effective process control, with specific objectives in terms of coating performance and energy efficiency, and an attempt is made to identify key points that are likely to assist this.

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Section: Thermal and Optical Propertiesmentioning

confidence: 99%

A review of recent work on discharge characteristics during plasma electrolytic oxidation of various metals

Clyne

Troughton

2018

International Materials Reviews

416

225

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“…To date, studies on the electrolyte formulas of the MAO process mainly focus on silicate, phosphate, sodium hydroxide, and aluminate system, etc. ; the combination of the above several kinds of systems; or joining different additives into the electrolyte system to obtain good performance coatings [6,[8][9][10][11][12][13][14][15]. Up to now, reports about soluble oxides, which also have a relatively low cost attribute compared to those nanoparticles [16][17][18][19][20], as additives in MAO electrolyte are still very rare.…”

Section: Introductionmentioning

confidence: 99%

Effect of V2O5 Additive on Micro-Arc Oxidation Coatings Fabricated on Magnesium Alloys with Different Loading Voltages

Wang

2020

Metals

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Effect of V2O5 additive in silicate-containing electrolyte on AZ91D magnesium alloys treated by micro-arc oxidation (MAO) technology under different loading voltages was investigated. The results showed that vanadium was well up-taken into the coating chemically. Moreover, a new phase of MgV2O4 with spinel structure was obtained in MAO coatings due to V2O5 added into the electrolyte. The MgV2O4 phase was responsible for the coatings exhibiting brown color and also was beneficial to improving the anti-corrosion property. In spotting tests, the corrosion resistances of coatings prepared under the high voltage are about 6–9 times higher than those of the low voltage because of the thicker coatings of the former. In potentiodynamic polarization tests, the coatings’ corrosion resistances were improved with the addition of V2O5, which was more significant under the low voltage than that under the high voltage. When the concentration of V2O5 was 0.2 g/L, the corrosion current density of the coating was the lowest, which means that the coating’s corrosion resistance under the low voltage is the best. Hence, it is necessary to carry out targeted design of the coating’s microstructure according to the different applications.

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“…Generally, the results observed from Figure 11 and Table 5 were consistent with the results from polarization curves and EIS analyses. In this process, the film color should gradually turn to brown, in which the final average power of the spark discharge to create a quantity of colored oxides on the film surface can be accounted for this phenomenon [61]. During the MAO process, MnO 4 2− should shift to the anode driven by the electric field force, and then is reduced to MnO, as shown in Equation (4).…”

Section: Coloration Mechanismmentioning

confidence: 99%

The Preparation and Properties of the Brown Film by Micro-arc Oxidized on In-Situ TiB2/7050Al Matrix Composites

et al. 2020

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The brown or grayish-white color films were prepared by the micro-arc oxidation (MAO) method on in-situ TiB2/7050Al composites using these alkaline electrolytes with/without KMnO4 as an additive. The microstructure, elemental composition, chemical state and corrosion behavior have been investigated by the microstructure characterizations and electrochemistry measurements on the MAO films comparatively. The results indicated that a brown film was obtained via adding KMnO4 into the alkaline electrolyte. The coloration mechanism of the brown color can be ascribed to the existence of MnO inside the film. Furthermore, the initiation of corrosion to the Al composite was intensively hindered by the brown MAO film. Compared with the Al substrate and grayish-white film, the brown MAO film exhibited the elevated corrosion potential and reduced corrosion current. Therefore, the brown film has presented an optimized corrosion resistance for the composite.

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Preparation of black PEO layers on Al–Si alloy and the colorizing analysis

Cited by 41 publications

References 18 publications

A review of recent work on discharge characteristics during plasma electrolytic oxidation of various metals

A review of recent work on discharge characteristics during plasma electrolytic oxidation of various metals

Effect of V2O5 Additive on Micro-Arc Oxidation Coatings Fabricated on Magnesium Alloys with Different Loading Voltages

The Preparation and Properties of the Brown Film by Micro-arc Oxidized on In-Situ TiB2/7050Al Matrix Composites

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