Fabrication of the nanoparticle incorporated PEO coating on commercially pure zirconium and its corrosion resistance

Arun, S.; Arunnellaiappan, T.; Rameshbabu, N.

doi:10.1016/j.surfcoat.2016.07.086

Cited by 41 publications

(18 citation statements)

References 36 publications

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“…As a result of rapid cooling (up to ~10 7 K / s) upon extinction of the microdischarge, composite regions and, possibly, incorporated particles in an almost unchanged state are retained in the coating. The incorporation of particles during PEO can also occur as a result of the electrophoretic process [33,34]. In article [35], devoted to the formation of PEO coatings on the Zr-1Nb alloy in the slurry electrolyte with yttria nanopowder, an additional (apart from the barrier, middle and outer layers) surface layer with thickness ~5 μm was noted.…”

Section: Discussionmentioning

confidence: 99%

“…So, additions to the alkaline electrolyte of such oxides nanoparticles as Al 2 O 3 , ZrO 2 , and CeO 2 during the formation of PEO coatings on zirconium promote increasing in their corrosion-protective ability in 3.5% NaCl. When adding CeO 2 nanoparticles to electrolytes, the corrosion currents for PEO coated samples decreased by four orders of magnitude compared to untreated zirconium [33]. Moreover, the addition of cerium dioxide and alumina nanoparticles in electrolytes promoted the formation of the t-ZrO 2 phase in PEO coatings.…”

Section: Introductionmentioning

confidence: 98%

“…In recent years, a significant number of papers devoted to improving the characteristics of coatings on zirconium and its alloys by incorporating fine particles into their structure from slurry electrolytes during PEO treatment have been published [33][34][35][36]. So, additions to the alkaline electrolyte of such oxides nanoparticles as Al 2 O 3 , ZrO 2 , and CeO 2 during the formation of PEO coatings on zirconium promote increasing in their corrosion-protective ability in 3.5% NaCl.…”

Section: Introductionmentioning

confidence: 99%

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Study of Coatings Formed on Zirconium Alloy by Plasma Electrolytic Oxidation in Electrolyte with Submicron Yttria Powder Additives

Савушкина

Герасимов

Apelfeld

et al. 2021

Metals

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Coatings with thickness 40 to 150 μm were formed by plasma electrolytic oxidation (PEO) on the zirconium alloy Zr-1Nb (Zr-1% Nb) in the slurry electrolyte containing 9 g/L Na2SiO3 5H2O, 5 g/L Na(PH2O2) and 6 g/L submicron Y2O3 yttria powder during 60 min under the AC electrical mode at current densities 20; 30 and 40 A/dm2. The surface morphology, structure, composition, and corrosion-protective ability of the formed coatings have been analyzed. At PEO current density 30 A/dm2, a predominantly tetragonal phase of zirconia was formed in coatings. Increasing the PEO current density up to 40 A/dm2 promoted the formation of the coating surface layer containing submicron yttria particles. Electrochemical polarization studies in 0.5% LiOH solution showed that PEO coatings demonstrated high corrosion-protective ability. The dependence of the polarization currents on the PEO current density was found to be inconsequential.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Study of Coatings Formed on Zirconium Alloy by Plasma Electrolytic Oxidation in Electrolyte with Submicron Yttria Powder Additives

Савушкина

Герасимов

Apelfeld

et al. 2021

Metals

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“…Light alloys (such as magnesium, aluminum, and titanium) are widely used in aerospace, automotive, and medical applications because of their lightness, high strength-to-weight ratio, good thermal and electrical conductivities, and biocompatibility. [1][2][3][4][5] Meanwhile, application of these alloys is limited by some shortcomings such as poor tribological and corrosion resistance and lack of performance data in compliance with living tissue. [6][7][8] To surmount these shortcomings and improve the performance of the surface of these alloys, various coating methods (e.g., ion implantation, laser surfacing, di®usion treatment, thermal spraying, physical vapor deposition (PVD), chemical vapor deposition (CVD) and conversion coatings such as anodizing) are implemented.…”

Section: Why Peo Coatingmentioning

confidence: 99%

A Review on Adhesion Strength of Peo Coatings by Scratch Test Method

et al. 2018

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Adhesion strength is one of the important properties that reflects the quality of a plasma electrolytic oxidation (PEO) coating. Scratch testing can be considered as an appropriate technique to evaluate the adhesion strength of PEO coatings on magnesium, titanium, and aluminum substrates. The scratch test is usually performed either under a constant or a progressively increasing normal load, where the critical load is used as a measure of adhesion strength of the coatings. In this review paper, the effect of different factors such as duration of coating processing, electrolyte composition, and processing current density, as well as different additives to the electrolyte bath, was studied on the adhesion strength of PEO coatings formed on magnesium, titanium, and aluminum substrates. It is understood that an optimum increase in process time and input energy leads to a corresponding increase in thickness of the PEO dense oxide layer and, consequently, an increase in critical load and adhesion strength. Moreover, the electrolyte composition and additives were found to affect the coating microstructure and composition and, subsequently, the coating adhesion strength.

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“…One popular inclusion is the zirconia powder, which has been reported to enhance corrosion, hardness, and thermal shock resistances. − On protecting the magnesium alloys, incorporation of ZrO 2 particles deserves special attention since Mg dissolution may help stabilize the zirconia phase and toughen the coating. − Another additive is the alumina powder of alpha phase, which possesses many favorable properties compared with other transition phases. Although PEO may grow alpha alumina without resorting to particulate inclusion, the alpha phase generally emerges later in coating after the gamma phase has established considerable thickness. , Incorporation of the alpha Al 2 O 3 powder is considered to assist in corrosion resistance, wear resistance, and hardness of the workpiece. − Inclusion of silicon carbide particles has also been attempted.…”

Section: Introductionmentioning

confidence: 99%

Particle Size Influences on the Coating Microstructure through Green Chromia Inclusion in Plasma Electrolytic Oxidation

Liu

Tsai

Wang

et al. 2017

ACS Appl. Mater. Interfaces

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In an effort to color the aluminum alloy surface green via plasma electrolytic oxidation (PEO), two alkaline solutions have been employed with particulate inclusions and sodium aluminate. Electrolyte I comprises a self-made chromia pigment with a mean particle size 69 nm, whereas electrolyte II contains a commercially available pigment, GN-M, with a larger particle size 351 nm. Both pigments are oxygen deficient CrO of corundum-type structure before coating, the oxidative environment of PEO converts them into stoichiometric CrO. In electrolyte I and II, the oxides of chromium and aluminum deposit simultaneously under analogous PEO conditions, yet resulting in very different microstructures. The GN-M inclusion of large size amasses on top of the coating, while the self-made inclusion goes deep, and closely associates with alumina and pores. The oxide coating, grown in electrolyte II, consists of a top CrO-rich layer and a dense alumina layer underneath, delineated by the boundary marked with microdischarge burns. On the other hand, the self-made particulate inclusion appears to bring the electric microdischarges inside the coating and create inner pores and damages. The structure difference, caused by the difference in microdischarge locations, is attributed to shifting of the CrO-AlO interface where p-type and n-type semiconductors meet.

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Fabrication of the nanoparticle incorporated PEO coating on commercially pure zirconium and its corrosion resistance

Cited by 41 publications

References 36 publications

Study of Coatings Formed on Zirconium Alloy by Plasma Electrolytic Oxidation in Electrolyte with Submicron Yttria Powder Additives

Study of Coatings Formed on Zirconium Alloy by Plasma Electrolytic Oxidation in Electrolyte with Submicron Yttria Powder Additives

A Review on Adhesion Strength of Peo Coatings by Scratch Test Method

Particle Size Influences on the Coating Microstructure through Green Chromia Inclusion in Plasma Electrolytic Oxidation

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