Effects of graphene nanosheets on the ceramic coatings formed on Ti6Al4V alloy drill pipe by plasma electrolytic oxidation

Liu, Wanying; Blawert, Carsten; Zheludkevich, Mikhail L.; Lin, Yuanhua; Talha, Mohd; Shi, Yufan; Chen, Long

doi:10.1016/j.jallcom.2019.03.060

Cited by 55 publications

(30 citation statements)

References 54 publications

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“…The smaller graphene located in the vicinity of the micro-discharge would be extruded. References [26,27] also discussed this similar mechanism.…”

Section: Microstructure and Composition Of The Coatingsmentioning

confidence: 77%

“…The wear is slight, and the abrasion surface is smooth (Figure 14c,d,f,g), showing the prominent wear resistance. The improvement of the conductivity of the electrolyte with graphene increases the discharge channels, and more oxides fill the pores layer by layer [27], so the coating shows the flatter and smoother structure and forms much Al 2 O 3 phase with high hardness and good wear resistance [44]. In addition, the coating incorporated graphene with excellent lubrication and anti-friction effect [42], not only keeping the friction coefficient at a low value but also no large fluctuations appearing.…”

Section: Wear Properties Of the Coatingsmentioning

confidence: 99%

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Corrosion and Wear Behavior of PEO Coatings on D16T Aluminum Alloy with Different Concentrations of Graphene

Liu

Liao

et al. 2020

Coatings

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The effect of added graphene concentration on the microstructure, phase composition, corrosion-and wear-resistance of plasma electrolyte oxidation (PEO) coatings formed on D16T aluminum alloy in silicate electrolyte with different concentrations of graphene were investigated. The results show that the morphologies of the coatings with graphene were obviously different ascribed to the mode of graphene incorporated into the coating. The coatings consisted of mainly α-Al 2 O 3 , γ-Al 2 O 3 , and Al, which were divided into an outer porous layer and a dense inner layer. The thickness of the coatings increased non-linearly with graphene concentration. The corrosion resistance of the coatings with graphene was significantly improved. The wear resistance of the coatings was also greatly improved apart from the coating with 3 g/L graphene. The coating produced in the electrolyte with 2 g/L graphene exhibited the optimal comprehensive properties because graphene successfully incorporated into the coating via the pores and spread on the surface of the coating.Coatings 2020, 10, 249 2 of 20 are influenced by various process parameters such as the constituent and concentration of electrolytes, oxidation time, substrate, various electrical parameters, and additives [7,8]. The constituent and concentration of the additive play an important role in changing the structure, morphology, wear-and corrosion-resistance of the coatings among those factors. A large number of works about the PEO coatings incorporated particles or powders like TiO 2 [9], ZrO 2 [10], Fe micrograins [11], α-Al 2 O 3 [8], and so on were performed. Zhao et al. [7] studied the effect of graphene oxide on the corrosion resistance of the PEO coating on AZ31 magnesium alloy, and reported that the incorporated graphene oxide markedly decreased micropores and improved the corrosion resistance of AZ31 magnesium alloy. Sarbishei et al. [12] reported that alumina nanoparticles incorporated into the PEO coatings formed on a titanium substrate, reducing the density of the coating and the pores' size. The corrosion resistance was improved with the increase of the alumina concentration, and the coatings formed in the electrolyte with 10 g/L alumina nanoparticles showed the best properties. Fatimah [13] studied the structure and corrosion properties of the coatings formed on 6061 Al alloy through the dual incorporation of SiO 2 and ZrO 2 nanoparticles into the oxide layer and found the coatings with SiO 2 and ZrO 2 displaying the best corrosion resistance because they were used as micropores blocker and cracks filler. Yazdanl et al. [14] studied the tribological performance of graphene/carbon nanotube hybrid reinforced Al 2 O 3 , and it was determined that the coating with graphene nanoplatelets hybrid reinforced Al 2 O 3 composites displayed the best wear resistance. Hvizdos et al. [15] studied the tribological properties of Si 3 N 4 -graphene nanocomposites, and Si 3 N 4 -graphene nanocomposites owned better wear resistance was also confirmed. Belmonte et al. [16] pro...

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“…The smaller graphene located in the vicinity of the micro-discharge would be extruded. References [26,27] also discussed this similar mechanism.…”

Section: Microstructure and Composition Of The Coatingsmentioning

confidence: 77%

Section: Wear Properties Of the Coatingsmentioning

confidence: 99%

Corrosion and Wear Behavior of PEO Coatings on D16T Aluminum Alloy with Different Concentrations of Graphene

Liu

Liao

et al. 2020

Coatings

Self Cite

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“…This was due to the metal thrown out from the micro discharge channels formed by sparks because the GNS blocks the channels. It can be said that the GNS additive prevents the growth of micro-sparking pores [ 28 ]. However, a small increase in the pore size was determined in the coating reinforced with 1.0 wt% GNS ( Figure 3 c).…”

Section: Resultsmentioning

confidence: 99%

“…They reported that the micropores in the PEO film were filled with the GO/sol-gel layer and the formation improves the corrosion performance of the substrates through the suitable barrier property of the GO nanosheets. Liu et al [ 28 ] investigated the effects of GNS on ceramic coatings deposited on the Ti6Al4V via the PEO method. They found that the GNS layers exhibited a physical barrier and significantly increased wear resistance and hardness of the coatings.…”

Section: Introductionmentioning

confidence: 99%

Surface Properties of Graphene Functionalized TiO2/nHA Hybrid Coatings Made on Ti6Al7Nb Alloys via Plasma Electrolytic Oxidation (PEO)

et al. 2021

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Nano-hydroxyapatite (nHA)-matrix coatings containing graphene nanosheets (GNS)-nHA were coated on Ti6Al7Nb alloys by plasma electrolytic oxidation (PEO) treatment for the improvement of their surface properties. Crystallographic properties, functional groups, and elemental analysis of coatings were characterized by XRD, ATR–FTIR, and EDS analysis. Surface morphological changes of the coated surfaces were investigated by AFM and SEM. The electrochemical corrosion behavior of the coatings was examined by using the potentiodynamic scanning (PDS) tests under in-vitro conditions in simulated body fluid (SBF). The results showed that the GNS was successfully deposited in ceramic matrix coatings on Ti6Al7Nb alloys. Also, the microstructural observations revealed that the coatings have a porous and rough structure. The XRD and ATR–FTIR quantitative analysis have proved the appearance of HA and GNS in the coating layers. An increase in the coating thickness, surface hardness, and anatase/rutile transformation rate was determined, while the GNS ratio in the coating layers was increased. The microhardness of the nHA coating reinforced with 1.5 wt% GNS was measured at 862 HV, which was significantly higher than that of GNS-free (only nHA) coating (584 HV). The best in-vitro resistance to corrosion in SBF was observed in the nHA/1.5GNS wt% coating.

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“…PEO is considered as a method between a common low voltage anodizing in aqueous solutions and a high-energy plasma coating in dry conditions in a controlled gas pressure chamber [7]. PEO can produce ceramic coatings on light metal surfaces with improved properties and the thickness of ten to hundreds of microns [8]. Oxide coatings are produced by high voltage anodic po-larization in an electrolyte [9].…”

Section: Introductionmentioning

confidence: 99%

Corrosion behavior of aluminum oxide coatings created by electrolytic plasma method under different potential regimes

Amiri

Targhi

Padervand

et al. 2020

jcc

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Effects of graphene nanosheets on the ceramic coatings formed on Ti6Al4V alloy drill pipe by plasma electrolytic oxidation

Cited by 55 publications

References 54 publications

Corrosion and Wear Behavior of PEO Coatings on D16T Aluminum Alloy with Different Concentrations of Graphene

Corrosion and Wear Behavior of PEO Coatings on D16T Aluminum Alloy with Different Concentrations of Graphene

Surface Properties of Graphene Functionalized TiO2/nHA Hybrid Coatings Made on Ti6Al7Nb Alloys via Plasma Electrolytic Oxidation (PEO)

Corrosion behavior of aluminum oxide coatings created by electrolytic plasma method under different potential regimes

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