Influence of secondary phases of AlSi9Cu3 alloy on the plasma electrolytic oxidation coating formation process

Wu, Ting; Blawert, Carsten; Zheludkevich, Mikhail L.

doi:10.1016/j.jmst.2019.12.031

Cited by 36 publications

(15 citation statements)

References 45 publications

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“…When Cu content in the Al substrate exceeded solubility limit (4.5%), Cu precipitated in the form of intermetallic Al 2 Cu [24]. Size and shape of Al 2 Cu are similar to that exhibited in literature [20]. Microarc discharge occurred preferentially on the α-Al substrate surrounding θ phase (Al 2 Cu).…”

Section: Measurement Of Mechanical Properties and Wear Resistancesupporting

confidence: 78%

“…Effect of the Cu content on thin coating formation was not explored. At short oxidation times of 15–480 s, Wu et al [20] reported that initial micropores appeared preferentially adjacent to intermetallic Al 2 Cu, and then intermetallic Al 2 Cu was dissolved. Moreover, large size pores were found at overlapping region of Al 2 Cu and β -Al 5 FeSi intermetallics.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Cu on microarc oxidation coated Al–xCu alloys

Dai

Zhang

et al. 2021

Surface Engineering

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Microarc oxidation (MAO) coatings were produced on the Al-Cu alloys at different oxidation times. Surface morphologies, phase composition and residual stress, and wear resistance were analysed by SEM and a laser scanning confocal microscopy, X-ray diffraction, and reciprocating friction and wear tester, respectively. Increases in surface roughness, porosity, cracks, thickness, and α-Al 2 O 3 content were found in the MAO coatings on Al-4.5Cu alloy. Presence of intermetallic Al 2 Cu in the Al-4.5Cu alloy improved wear resistance and induced residual compressive stress formation in the coatings. Heat accumulation of intermetallic Al 2 Cu was the key factor that led to the differences in coating microstructure and nature of residual stress. In addition, mechanical properties of the coated samples were slightly changed compared to that of bare Al-Cu alloys. Presence of intermetallic Al 2 Cu was advantageous to wear resistance and oxide film formation of MAO coated Al-Cu alloys.

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Section: Measurement Of Mechanical Properties and Wear Resistancesupporting

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Effect of Cu on microarc oxidation coated Al–xCu alloys

Dai

Zhang

et al. 2021

Surface Engineering

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“…6 ), the surrounding Al matrix is quickly oxidized and the formed oxide layer fully covers most of nearby small Si particles. Considering Fe–Mn precipitates, according to Wang et al 42 , the presence of Fe produces residual defects in the native oxide layer providing a path for the penetration of electrolyte, and thus causing the formation of more porous coatings and reducing the growth rate of the coating, due to a reduction in the oxidation efficiency. For these reasons, the coatings obtained on the as printed and annealed samples, characterized by a uniform and finely distributed silicon and by the absence of Fe–Mn precipitates, resulted thicker and denser.…”

Section: Resultsmentioning

confidence: 99%

“… 41 found that a reduction in the size of the eutectic Si causes the formation of a thicker PEO layer; Wu et al . 42 found that the coating is characterized by large micropores on iron-rich precipitates and it is thin with small micropores on eutectic Si. As previously described, samples produced by L-PBF are characterized by a unique microstructure that can be significantly modified, in particular regarding Si distribution, through common heat treatments such as solution treatment and annealing.…”

Section: Introductionmentioning

confidence: 99%

Influence of silicon morphology on direct current plasma electrolytic oxidation process in AlSi10Mg alloy produced with laser powder bed fusion

Pezzato

Gennari

Franceschi

et al. 2022

Sci Rep

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In this work, plasma electrolytic oxidation (PEO) process was applied on AlSi10Mg samples, produced with laser powder bed fusion (L-PBF), in the as printed condition and after different heat treatments, and, for comparison, on as-cast samples of AlSi10Mg. PEO process was performed in direct-current mode using high current densities and short time in a basic silicate electrolyte. For the first time, the effects of silicon morphology in L-PBF AlSi10Mg samples, in as printed condition and after different heat treatments, on the obtained PEO coating were investigated in terms of microstructure and corrosion properties. The microstructure of the substrate was characterized with optical and electron microscopy observations (optical microscopy OM, scanning electron microscopy SEM, and transmission electron microscopy TEM) and with X-ray diffraction (XRD). The analysis showed that heat treatments of annealing and solution treating modified the morphology and distribution of silicon in the samples obtained through L-PBF. The PEO coated samples were characterized with SEM, both on the surface and in the cross-section, and compositional analysis were performed with energy dispersive spectroscopy (EDS) analysis and elemental mapping. The coatings were also analyzed with XRD and the corrosion properties evaluated through electrochemical impedance spectroscopy (EIS) tests. Also microhardness tests were performed on the substrates and on the coatings. The microstructure of the coatings was strongly influenced by the silicon distribution. In particular, a non-uniform distribution of silicon and the presence of iron-rich intermetallic (obtained in the as-cast and solution treated samples) induced the formation of more porous and thinner coatings in comparison with the ones obtained in the as printed and annealed samples. The not-uniform silicon distribution produced a not-homogenous distribution of silicon into the coatings. The particular cellular structure of the as printed sample induced the formation of a coating with a higher amorphous fraction, in comparison with the ones produced on the other samples. The higher thickness and lower porosity of the coatings obtained on the annealed and as printed samples resulted in an increase of the corrosion resistance.

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“…Copper is one of the most used biocides exhibiting excellent antibacterial and antifouling properties [3,15] in a wide range of surface materials, and it can also be employed in PEO coatings. The common strategies to incorporate copper species into the oxide layer of the PEO coating are using Al-Cu alloys as the metal precursor substrate [16][17][18][19][20] or adding copper species into the electrolyte during the anodization [3,15,21]. On the other hand, when the purpose is to fabricate a heterojunctioned material, a copper plating procedure can be performed after the anodization [22], forming a metallic layer over the oxide coating.…”

Section: Introductionmentioning

confidence: 99%