Dual incorporation of SiO 2 and ZrO 2 nanoparticles into the oxide layer on 6061 Al alloy via plasma electrolytic oxidation: Coating structure and corrosion properties

Fatimah, Siti; Kamil, M.P.; Kwon, Joong Ho; Kaseem, Mosab; Ko, Young Gun

doi:10.1016/j.jallcom.2016.11.098

Cited by 78 publications

(28 citation statements)

References 33 publications

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“…Depending on a number of factors (chemical, physical and electrical), particles may simply become physically entrapped in the coating as it grows or may undergo reactive incorporation. Some success has been reported [41][42][43][44][45][46] for such measures, although there will commonly be a danger that such dispersions are damaged or removed during the restructuring associated with repeated discharge formation. Nevertheless, it is clear that even very fine particulate can in some cases be successfully introduced into PEO coatings in this way.…”

Section: Electrolyte Composition and Additivesmentioning

confidence: 99%

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

Clyne

Troughton

2018

International Materials Reviews

408

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: Electrolyte Composition and Additivesmentioning

confidence: 99%

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

Clyne

Troughton

2018

International Materials Reviews

408

225

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“…These reports also paralleled the ndings of Cheng et al and Troughton et al 29,30 The breakdown voltages of MO and NiMO were equal, $225 V, as a result of the equivalent electrolyte conductivity associated with similar KOH concentration. [31][32][33] Stage II was important, because it determined the characteristics of the inner layer, which served as the main contributor to corrosion protection. 34 Moreover, this stage was also important to the early decoration of the inorganic layer, since the incorporation of electrolyte species would be promoted by the high energy plasma.…”

Section: 2425mentioning

confidence: 99%

“…68 In addition, the electrolyte was stirred throughout the PEO process, assisting the incorporation of particles. 31 The vigorous plasma discharges further facilitated the incorporation of Ni(OH) 2.4 0.4À into the inorganic layer. Ni , and H 2 O to produce Ni(OH) 2 , as shown in eqn (6).…”

Section: 67mentioning

confidence: 99%

Decoration of an inorganic layer with nickel (hydr)oxide via green plasma electrolysis

Fatimah

Khoerunnisa

2018

RSC Adv.

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In this study, we describe the green plasma electrolysis of a magnesium alloy in alkaline electrolyte to produce a hybrid inorganic layer with nickel (hydr)oxide incorporated in a matrix of magnesium oxide, and investigate the electrochemical and optical properties of this material. The addition of Ni(NO 3 ) 2 $6H 2 O to the electrolyte reduced the size of the micro-defects found in the inorganic layer after plasma electrolysis by inducing soft plasma discharges. As a result, through cyclic voltammetry and polarization tests, the corrosion stability of the sample containing nickel (hydr)oxide was significantly enhanced. Measurement of the optical properties reveals that the material possesses excellent energy efficiency as indicated by a high solar absorptivity of $0.92 and a low infrared emissivity of $0.13 which are presumably due to the inherent dark-brown colour of nickel (hydr)oxide. We expect that these results will have implications in the development of functional materials with excellent optical and corrosion properties by considering green processing utilizing alkaline electrolyte.

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“…A thick and hard ceramic oxide coating is prepared on Al alloys. Hence, MAO treatment can effectively improve the mechanical and corrosion properties of Al alloys for applications in various industrial branches, such as aerospace, automotive, naval, biomedicine, electronics and energy [7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Simulation of salt spray corrosion behaviour of micro-arc oxidation coating by laser induced Ag infiltration

Liu

Hai-long

et al. 2020

Mater. Res. Express

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Micro-arc oxidation (MAO) coating was initially prepared on 6061 Al alloy, and subsequently coated with Ag using magnetron sputtering. Laser beam scan (LBS) treatments were then applied to infiltrate the sputtered Ag into the MAO coating in order to simulate the corrosion behaviour of the MAO coating during the neutral salt spray test (NSST). Cross-sectional morphologies and Ag element distribution maps were studied by using the field emission scanning electron microscopy (FESEM) on the MAO-Ag coated samples after LBS infiltration. The results showed that there existed the microcracks with tree-root or lightning shape within the MAO coating. Interconnected aggregates, including micro-pores, large cavities far beneath the surface and tree-root like micro-cracks, served as complex corrosion channels during salt spray corrosion. Through these corrosion channels, the salt spray penetrated gradually into the interface between the MAO coating and the original Al substrate, thus causing corrosion of the Al substrate during the NSST. The LBS treatment is presented as a method to explore the subtle micro-crack and pore channels associated to the MAO coating and to provide information that paves the way towards understanding of corrosion phenomena in these porous systems.

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Dual incorporation of SiO 2 and ZrO 2 nanoparticles into the oxide layer on 6061 Al alloy via plasma electrolytic oxidation: Coating structure and corrosion properties

Cited by 78 publications

References 33 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

Decoration of an inorganic layer with nickel (hydr)oxide via green plasma electrolysis

Simulation of salt spray corrosion behaviour of micro-arc oxidation coating by laser induced Ag infiltration

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