1Influence of graphene oxide additive on the tribological and electrochemical corrosion properties of a PEO coating prepared on AZ31 magnesium alloy

Zhang, Yulin; Chen, Fei; You, Zhang; Du, Cuiwei

doi:10.1016/j.triboint.2019.106135

Cited by 86 publications

(22 citation statements)

References 40 publications

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“…This result is consistent with the conclusion that the ceramic layers with loose structure and more internal defects tend to have higher capacitance and lower resistance. 45 From the fitting results in Table 4, it's obviously found that the resistance values (R 1 and R 2 ) of the coatings are larger than those of uncoated D16T. Moreover, the values of R 1 and R 2 of G2 are larger than that of G0.…”

Section: F I G U R E 8 the Electrochemical Behavior Test Of The Uncoa...mentioning

confidence: 91%

Effect of graphene on the microstructure and corrosion resistance of PEO coating formed on D16T aluminum alloy

Liu

Xie

et al. 2022

Int J Applied Ceramic Tech

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Incorporated graphene coating was successfully prepared on D16T aluminum alloy by plasma electrolytic oxidation (PEO) technology, and the effect of graphene on the microstructure, corrosion resistance, and wettability of the coating was investigated. Microstructure, composition, and morphology were studied by transmission electron microscope, confirming that graphene was successfully incorporated into the coating with pancake-like and embedded mode. The thickness and microhardness of the coating with graphene (G2) increased, whereas roughness and porosity reduced due to the incorporation of graphene, compared to the coating without graphene (G0). The resistive arc radius of G2 is obviously increased. The real impedance value of G2 is four times than that of G0. The resistance (R 1 ) of G0 and G2 are 3708 and 7533 Ω cm 2 , respectively. The resistance (R 2 ) of G0 and G2 are 2.508E5 and 7.752E5 Ω cm 2 , respectively. The contact angle of G2 under three liquid droplets was maximum, showing minimal surface-free energy (36.8 mJ/m 2 ). Formation water showed the most obvious effect on the wettability of the coating compared to the distilled water and sodium chloride solution. Results verified that graphene in PEO coating significantly improved the microstructure of the coating and enhanced the hydrophobic performance and corrosion resistance of the coating.

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Section: F I G U R E 8 the Electrochemical Behavior Test Of The Uncoa...mentioning

confidence: 91%

Effect of graphene on the microstructure and corrosion resistance of PEO coating formed on D16T aluminum alloy

Liu

Xie

et al. 2022

Int J Applied Ceramic Tech

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“…For Al and Ph coatings (Figure 9a,b), the damage is not severe after 15 min and only asperities have been micro-polished. The status of friction pairs is "ball-on-protrusions" style indicating that the ceramic ball wears small-sized bumps and smoothens the asperities in the contact area [50]. Therefore, it could be observed that the micro-morphology of wear tracks is almost the same after 15 and 30 min for both Al and Ph coatings.…”

Section: Wear Resistance Of the Coatingsmentioning

confidence: 92%

“…In the first stages, fragmentation of protrusions does not intensify the wear process because the micro-pores and cracks act as reservoirs on the surface. As sliding continues, generated debris fills the larger-sized flaws, and the rest of the spalling particles engage in the wear process as third-bodies [29,50]. The literature [33,50] supposed third-body abrasion is the main wear mechanism in PEO coatings.…”

Section: Wear Resistance Of the Coatingsmentioning

confidence: 99%

“…As sliding continues, generated debris fills the larger-sized flaws, and the rest of the spalling particles engage in the wear process as third-bodies [29,50]. The literature [33,50] supposed third-body abrasion is the main wear adhesive wear when the ball touches the substrate in Si specimen, which is consistent with previous studies [29,32,50]. The wear rates are calculated by taking into account the worn volume, applied load, and the test distance for a better comparison of coatings, and the results are illustrated in Figure 10.…”

Section: Wear Resistance Of the Coatingsmentioning

confidence: 99%

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The Effect of Electrolytic Solution Composition on the Structure, Corrosion, and Wear Resistance of PEO Coatings on AZ31 Magnesium Alloy

et al. 2020

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Plasma electrolytic oxidation coatings were prepared in aluminate, phosphate, and silicate-based electrolytic solutions using a soft-sparking regime in a multi-frequency stepped process to compare the structure, corrosion, and wear characteristics of the obtained coatings on AZ31 magnesium alloy. The XRD results indicated that all coatings consist of MgO and MgF2, while specific products such as Mg2SiO4, MgSiO3, Mg2P2O7, and MgAl2O4 were also present in specimens based on the selected solution. Surface morphology of the obtained coatings was strongly affected by the electrolyte composition. Aluminate-containing coating showed volcano-like, nodular particles and craters distributed over the surface. Phosphate-containing coating presented a sintering-crater structure, with non-uniform distributions of micro-pores and micro-cracks. Silicate-containing coating exhibited a scaffold surface involving a network of numerous micro-pores and oxide granules. The aluminate-treated sample offered the highest corrosion resistance and the minimum wear rate (5 × 10−5 mm3 N−1 m−1), owing to its compact structure containing solely 1.75% relative porosity, which is the lowest value in comparison with other samples. The silicate-treated sample was degraded faster in long-term corrosion and wear tests due to its porous structure, and with more delay in the phosphate-containing coating due to its larger thickness (30 µm).

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“…The influence of Graphene concentration on the PEO coatings, produced on D16T aluminum alloy for the silicate-based electrolyte, were studied. The findings revealed that the morphologies of graphene-coated coatings differed significantly depending on the manner of graphene incorporation [16]. The coatings Al 2 O 3 and Al were split into a porous layer and a thick inner layer.…”

Section: Introductionmentioning

confidence: 99%

Development of an Oxide Layer on Al 6061 Using Plasma Arc Electrolytic Oxidation in Silicate-Based Electrolyte

et al. 2022

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The plasma electrolytic method is one of the techniques which can be used to form an oxide layer on the substrate material surface. This technique employs ion exchange by developing an electrolytic arc between the cathode and the anode. The strong bond at high temperatures promotes the formation of an oxide layer on the metal surface. The electrolyte composition has a strong influence on the metal surface characteristics. Hence, the addition of certain nanoparticles in an adequate amount can improve the surface properties like wear and corrosion resistance. In this study, a plasma electrolytic technique based on using a direct current and voltage approach is investigated. The plasma electrolytic technique is utilized to develop an oxide layer on the Al6061 alloy substrate surface using a DC voltage input on a silicate-based electrolyte. The substrate surface is then investigated for the thickness of the oxide layer formed and the amount of carbon element absorbed, using the SEM and XRD analysis. The experimentation and the study of the results confirmed the presence of a substantial oxide layer on the surface. The influence of the process on the output parameters-direct voltage and electrode distance is studied with the significant changes obtained in the weight percentage of elements like C, Al, Si, and O as supported by SEM and EDAX analysis. Most changes occurred when using a 197 V and in the current range of 0.3 A to 1 A. This can be useful further to improve the mechanical properties of the metal alloy using the plasma arc oxidation method.

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1Influence of graphene oxide additive on the tribological and electrochemical corrosion properties of a PEO coating prepared on AZ31 magnesium alloy

Cited by 86 publications

References 40 publications

Effect of graphene on the microstructure and corrosion resistance of PEO coating formed on D16T aluminum alloy

Effect of graphene on the microstructure and corrosion resistance of PEO coating formed on D16T aluminum alloy

The Effect of Electrolytic Solution Composition on the Structure, Corrosion, and Wear Resistance of PEO Coatings on AZ31 Magnesium Alloy

Development of an Oxide Layer on Al 6061 Using Plasma Arc Electrolytic Oxidation in Silicate-Based Electrolyte

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