Effect of sodium benzoate on corrosion behavior of 6061 Al alloy processed by plasma electrolytic oxidation

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

doi:10.1016/j.surfcoat.2015.11.006

Cited by 61 publications

(24 citation statements)

References 35 publications

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“…It can be concluded that the corrosion resistance of the coatings with graphene is an order of magnitude greater than that of the bare Al alloy (Figure 8b,c). As previously observed [34,35], EIS spectra displayed two-time constants representing the double layer. The high-frequency time constant of the constant phase element was associated with the outer layer, and the second low-frequency time constant of constant phase elements was associated with the inner layer.…”

Section: Electrochemical Behavior Of the Coatingssupporting

confidence: 82%

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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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Section: Electrochemical Behavior Of the Coatingssupporting

confidence: 82%

“…The metastable γ-Al2O3 transforms into more stable α-Al2O3. The reactions can be clarified by the following formulas [34]: 3 Al Al 3e…”

Section: Phase Composition 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

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“…8 showed that the Nyquist plot of the sample in Bath A consisted of two semicircles, implying two responses of different time constants. According to previous investigations in the field of PEO9101231, the time constant of high frequency would typically ascribed to the outer layer while that of low frequency was related to the response from the inner layer. In case for PEO-coated samples in Baths B and C, the two semicircles might overlap one another due to the concurrent increase in radius.…”

Section: Resultsmentioning

confidence: 92%

Soft plasma electrolysis with complex ions for optimizing electrochemical performance

Kamil

Kaseem

2017

Sci Rep

104

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Plasma electrolytic oxidation (PEO) was a promising surface treatment for light metals to tailor an oxide layer with excellent properties. However, porous coating structure was generally exhibited due to excessive plasma discharges, restraining its performance. The present work utilized ethylenediaminetetraacetic acid (EDTA) and Cu-EDTA complexing agents as electrolyte additives that alter the plasma discharges to improve the electrochemical properties of Al-1.1Mg alloy coated by PEO. To achieve this purpose, PEO coatings were fabricated under an alternating current in silicate electrolytes containing EDTA and Cu-EDTA. EDTA complexes were found to modify the plasma discharging behaviour during PEO that led to a lower porosity than that without additives. This was attributed to a more homogeneous electrical field throughout the PEO process while the coating growth would be maintained by an excess of dissolved Al due to the EDTA complexes. When Cu-EDTA was used, the number of discharge channels in the coating layer was lower than that with EDTA due to the incorporation of Cu2O and CuO altering the dielectric behaviour. Accordingly, the sample in the electrolyte containing Cu-EDTA constituted superior corrosion resistance to that with EDTA. The electrochemical mechanism for excellent corrosion protection was elucidated in the context of equivalent circuit model.

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“…The surface of the MAO coating was characterized by the typical porous structure along with some micro-cracks. The observed micro-pores are regarded as traces of the plasma discharge, while the micro-cracks result from thermal stresses induced during the MAO process [24,25]. The surface porosity of MAO/Ag coating was found to be 2.35±0.16%.…”

Section: Microstructure Of the Mao Coatingmentioning

confidence: 96%

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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Effect of sodium benzoate on corrosion behavior of 6061 Al alloy processed by plasma electrolytic oxidation

Cited by 61 publications

References 35 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

Soft plasma electrolysis with complex ions for optimizing electrochemical performance

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

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