Microstructure and multi-scale mechanical behavior of hard anodized and plasma electrolytic oxidation (PEO) coatings on aluminum alloy 5052

Wheeler, Jeffrey M.; Curran, J.A.; Shrestha, Suman

doi:10.1016/j.surfcoat.2012.07.056

Cited by 76 publications

(30 citation statements)

References 38 publications

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“…Scratch testing is a common laboratory method to assess abrasion resistance, cohesive and adhesive strength of PEO coatings [22,40,41]. These characteristics are of interest here, as mechanical failure would usually compromise the barrier protection provided by the PEO Young modulus (and are therefore known as an effective additive for strengthening and toughening polymers), which means the strength of PEO coatings on Mg could also be expected to be enhanced by HNT incorporation.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

“…To date, a great deal of research focusing on understanding corrosion behaviour and enhancement of corrosion protection of magnesium alloys has been carried out [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. Among these studies, plasma electrolytic oxidation (PEO) coatings have attracted significant attention, because this environmental friendly surface treatment can provide relatively good protection for lightweight metals, such as aluminium, magnesium and titanium [17,18,[20][21][22][23][24]. Recently, extensive studies have been carried out aimed at obtaining high-quality wear-and corrosion-resistant PEO coatings on components manufactured at a large scale [25,26].…”

Section: Introductionmentioning

confidence: 99%

“…10, indicating that characteristic critical loads LC2 and LC3, corresponding to the first substrate exposure and its complete opening, lie in the ranges 13.6 to 16.6 N and 18 to 23.1 N, respectively. Usually the critical loads depend upon stylus tip radius, coating thickness, fracture toughness, and adhesion to the substrate[22]. The coating failure is normally accompanied by changes in AE and/or FC behaviour, so these two characteristics are often used to determine the failure onset point.…”

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confidence: 99%

“…The increase in LC3 for the PEO coating produced in the BTA-HNT electrolyte is rather insignificant. The difference in critical loads between the PEO coatings could be attributed to differences in both coating strength and thickness[22]. Taking account of the coating thickness shown inFig.…”

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confidence: 99%

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Self-healing plasma electrolytic oxidation coatings doped with benzotriazole loaded halloysite nanotubes on AM50 magnesium alloy

et al. 2016

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0 200 -150 0 50 Z (kcm 2 ) Z (kcm 2 )2 Research Highlights  Simple single-step PEO process for production of self-healing coatings on Mg  Benzotriazole loaded halloysite nanotubes incorporated in PEO coatings on Mg  The nanotubes increased mechanical properties of PEO coatings  pH increase at corrosion sites promoted BTA-mediated nucleation of Mg(OH)2  Dense Mg(OH)2 film formed on corrosion sites inhibited pitting corrosion Abstract:Halloysite nanotubes (HNT) and benzotriazole (BTA) loaded HNT were added to a silicatebased electrolyte to produce PEO coatings on AM50 alloy. The coatings were characterised by SEM, EDX and XRD methods. Corrosion behaviour in 3.5 wt.% NaCl was studied by EIS and PDP scans. The HNT increased coating scratch resistance greater than BTA-HNT, although the latter enhanced corrosion resistance due to a self-healing effect. This was triggered by a dense Mg(OH)2 film being formed on corrosion sites following partial coating degradation, preventing pitting corrosion. The single-step process for producing self-healing PEO coatings has good potential in corrosion protection of Mg.

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Section: Mechanical Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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Self-healing plasma electrolytic oxidation coatings doped with benzotriazole loaded halloysite nanotubes on AM50 magnesium alloy

et al. 2016

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“…• Thermochemical Diffusion treatments methods (case hardening) as Nitriding [1] and Carburising [2] • Oxidation of the surface layer of aluminum alloys by Hard Anodizing or Plasma Electrolytic Oxidation (PEO) [3] • Nickel deposition with other element as tungsten, phosphorus, and boron. Researchers have completed deposition in different ways are: Nickel Electroplating [4], Nickel Electroless plating [5,6,7], Physical vapor deposition (PVD) and Chemical vapor deposition (CVD) [8], all this methods followed by diffusion heat treatment.…”

Section: Introductionmentioning

confidence: 99%

Study the Effect of Diffusion Heat Treatments for Nickel Electroplating on the Surface Hardness of 7075 Aluminum Alloy

Dahiye

Makki

Alnefawy

2016

ILCPA

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ABSTRACT:In this research a surface hardening process by Ni coating and subsequent diffusion heat treatments was studied at 7075 Aluminum alloy. Nickel coatings with different thickness were obtained by change the coating time and current density. Heat treatments at 450 °C, 500 °C, and 550 °C for times (6, 12, 24) hours were performed in order to obtain surface hardening required of the aluminum alloy by diffusion of nickel into the substrate. The effect of temperature and diffusion time on surface hardness of Al 7075 alloy was studied. Surface hardness about 800 [HV] were achieved after heat treatment at 500 °C for 24 hour by diffusion of Ni in the substrate and cause of formation of Al 3 Ni 2 intermetallic phase, as x-ray diffraction tests of samples showed. While is about 670 [HV] after heat treatment at 550 °C for 24 hour because of diffusion of aluminum toward the surface of sample, as x-ray diffraction tests of samples showed. INTRODUCTIONAluminum and its alloys are attractive for many applications in chemical, automobile and aerospace industries because of their excellent properties as height strength-to-weight ratio, high electrical and thermal conductivities and good formability, however their hardness is poor in comparison of steel and continuous efforts are made in the research into new possibilities for making use of the advantage of the aluminum in application that were reserved up to now for harder materials. The solution mainly adopted is to produce a thick hardened layer on the substrate by three major methods:• Thermochemical Diffusion treatments methods (case hardening) as Nitriding We have known that researchers have studied the surface hardening of 7075 aluminum alloy by various methods mentioned, except by nickel electroplating. Moreover, there is a few of researchers have studied the effect of nickel electroplating on the surface hardness of different aluminum alloys. Where A.Ul-Hamid et al studied the effect of the heat treatment of the 2014 aluminum alloy that plated electrically with nickel on the surface mechanical properties as the surface hardness, micro scratch and friction coefficient [4], without study the effect of different temperatures and times of heat treatments on these mechanical properties. So in this work, we studied the effect of temperatures and times of heat treatments on the diffusion of nickel deposited by electroplating of 7075 aluminum alloy, and thus on the surface hardness of the 7075 aluminum alloy.

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Annealing of Electrodeposited Nickel Coatings on Aluminum Alloy: Microstructural Properties and Wear Resistance of Nickel-Rich Aluminide Layers

Krim,

Giljean,

Marsiquet

et al. 2023

J. of Materi Eng and Perform

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Microstructure and multi-scale mechanical behavior of hard anodized and plasma electrolytic oxidation (PEO) coatings on aluminum alloy 5052

Cited by 76 publications

References 38 publications

Self-healing plasma electrolytic oxidation coatings doped with benzotriazole loaded halloysite nanotubes on AM50 magnesium alloy

Self-healing plasma electrolytic oxidation coatings doped with benzotriazole loaded halloysite nanotubes on AM50 magnesium alloy

Study the Effect of Diffusion Heat Treatments for Nickel Electroplating on the Surface Hardness of 7075 Aluminum Alloy

Annealing of Electrodeposited Nickel Coatings on Aluminum Alloy: Microstructural Properties and Wear Resistance of Nickel-Rich Aluminide Layers

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