Effect of potassium permanganate on corrosion and wear properties of ceramic coatings manufactured on CP-aluminum by plasma electrolytic oxidation

Shamsi, Fahimeh; Khorasanian, M.; Baghal, S.M. Lari

doi:10.1016/j.surfcoat.2018.04.050

Cited by 17 publications

(8 citation statements)

References 24 publications

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“…These arguments suggest that inhibiting the cathodic activity of IMPs by surface treatment is also effective in suppressing the galvanic corrosion of Al alloys in contact with steels under atmospheric corrosion environments. Chemical conversion treatments have been used to suppress the cathodic activity of the IMPs in Al alloys [27][28][29][30][31] ) is known to be a promising candidate for chromate-free conversion treatments [32][33][34][35][36] . Because MnO 4…”

Section: Introductionmentioning

confidence: 99%

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Role of KMnO<sub>4</sub>–NaF Treatment in Galvanic Corrosion Resistance of AA5083 Coupled to Steel

et al. 2023

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The role of KMnO 4 -NaF conversion treatment in the galvanic corrosion resistance of AA5083 aluminum alloy coupled to AISI 1045 carbon steel in synthetic seawater (diluted 100 times) was investigated. The 10 min-treated AA5083 was observed to reduce the period of high current density during the early stage of coupling and decrease the number of localized corrosion damages on the AA5083. The 10 min conversion treatment significantly reduced the electrode potential of bulk Al 6 (Fe, Mn), and it was concluded that the Al 6 (Fe, Mn) particles on the conversion-treated AA5083 no longer acted as a local cathode at the electrode potential when the AA5083 was in contact with AISI 1045 carbon steel. The decrease in cathodic activity of Al 6 (Fe, Mn) was attributed to the removal of Fe from the surface film of Al 6 (Fe, Mn), addition of Mn by the conversion treatment, and thickening of the film.

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Section: Introductionmentioning

confidence: 99%

“…, and the film contributes to improving the corrosion resistance of Al alloys [34][35][36] . In some cases, NaF is added to MnO 4 − treatment solutions, and it has been proposed that NaF acts as an activator for Al alloys to promote the reaction rate of MnO 4 − reduction [36][37][38][39] .…”

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confidence: 99%

Role of KMnO<sub>4</sub>–NaF Treatment in Galvanic Corrosion Resistance of AA5083 Coupled to Steel

et al. 2023

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“…A thick and hard ceramic oxide coating is prepared on Al alloys. Hence, MAO treatment can effectively improve the mechanical and corrosion properties of Al alloys for applications in various industrial branches, such as aerospace, automotive, naval, biomedicine, electronics and energy [7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

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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“…Plasma electrolytic oxidation (PEO) is considered one of the most promising technologies for the in situ production of ceramic coatings on the surface of Mg and its alloys. Because of the involvement of complex electro-, thermo-, and plasma-chemical reactions during the PEO treatment, the resultant ceramic coatings are characterized by superior adhesion strength, high hardness and electrical resistivity, as well as higher thermal and chemical stabilities, which in turn, enhance the corrosion and wear performance of the Mg substrate. , However, the long-term performance of PEO-coated components under aggressive conditions remains a concern because of the porous microstructure. , Thus, corrosion and wear attacks are preferentially initialized from the weak points on the surface, for example, open pores and cracks, where the concentration of corrosive species and stress usually occurs. − Modifying the parameters of the power supply , and the electrolyte composition , or adding micro-/nanoparticles ,− can increase the compactness and hardness of PEO coatings; alternatively introducing lubricants (e.g., poly(tetrafluoroethylene), lactate dehydrogenase, and MoS 2 ) can reduce the wear attack of both the coatings and counterparts. Nevertheless, the porous microstructure of PEO coatings is difficult to change considering the dielectric breakdown growth mechanism.…”

Section: Introductionmentioning

confidence: 99%

“…8,9 Thus, corrosion and wear attacks are preferentially initialized from the weak points on the surface, for example, open pores and cracks, where the concentration of corrosive species and stress usually occurs. 10−12 Modifying the parameters of the power supply 13,14 and the electrolyte composition 15,16 or adding micro-/ nanoparticles 9,17−19 can increase the compactness and hardness of PEO coatings; alternatively introducing lubricants (e.g., poly(tetrafluoroethylene), lactate dehydrogenase, and MoS 2 ) can reduce the wear attack of both the coatings and counterparts. Nevertheless, the porous microstructure of PEO coatings is difficult to change considering the dielectric breakdown growth mechanism.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Wear Performance of Hybrid Epoxy-Ceramic Coatings on Magnesium Substrates

Yang

Blawert

et al. 2018

ACS Appl. Mater. Interfaces

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Epoxy-based polymer was deposited as sealing agent on porous anodized coatings prepared by plasma electrolytic oxidation (PEO) to construct multilayered "soft-hard" coatings on Mg substrates. Different thicknesses and microstructures of the top epoxy layer were achieved by employing different dip-coating strategies. Atomic force microscopy, pull-off tests, and nanoindentation tests were conducted to study the surface roughness, the adhesion strength of the epoxy layer, and the mechanical properties of each component in the hybrid coating system. The micropores and other defects on the anodized layers were sealed by the epoxy polymer, which decreased the surface roughness. The dominant abrasive wear behavior of blank PEO coatings was significantly reduced by the epoxy layers, and the wear mechanism of the hybrid coatings was proposed considering both the microstructure of the hybrid coatings and the mechanical properties of the different components in the hybrid system.

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Effect of potassium permanganate on corrosion and wear properties of ceramic coatings manufactured on CP-aluminum by plasma electrolytic oxidation

Cited by 17 publications

References 24 publications

Role of KMnO<sub>4</sub>–NaF Treatment in Galvanic Corrosion Resistance of AA5083 Coupled to Steel

Role of KMnO<sub>4</sub>–NaF Treatment in Galvanic Corrosion Resistance of AA5083 Coupled to Steel

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

Enhanced Wear Performance of Hybrid Epoxy-Ceramic Coatings on Magnesium Substrates

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