2017
DOI: 10.17222/mit.2015.302
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Formation of a corrosion-resistant alumina coating on a 6061 aluminum alloy using a combination of micro-arc oxidation and sealing treatments

Abstract: Micro-arc oxidation (MAO) is an attractive process for the fabrication of protective coatings on aluminum alloys used in many industrial applications, such as automotive, structural and aerospace. However, improvements in the corrosion resistance of aluminum alloys upon covering their surfaces with MAO coating may not be sufficient for extending the service life of the components utilized in harsh environments. In the present study, the MAO coating formed on a 6061 aluminum alloy was sealed using a stearic aci… Show more

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Cited by 6 publications
(7 citation statements)
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“…Figure 7 shows the XRD results of each specimen after corrosion; in addition to the material of the coating itself, the corrosion product Al(OH) 3 appeared. The main reaction equations for the coating in the corrosive solution are as follows (Khamaj and Jabril, 2016; Paksoy et al , 2017): …”
Section: Resultsmentioning
confidence: 99%
“…Figure 7 shows the XRD results of each specimen after corrosion; in addition to the material of the coating itself, the corrosion product Al(OH) 3 appeared. The main reaction equations for the coating in the corrosive solution are as follows (Khamaj and Jabril, 2016; Paksoy et al , 2017): …”
Section: Resultsmentioning
confidence: 99%
“…The X-ray penetrated the coating and reached the aluminum alloy substrate, so Al was detected. Al 2 O 3 is the main component of micro-arc oxidation coating, which can be divided into α crystal and γ crystal [10,14,17]. α-Al 2 O 3 is a stable phase and γ-Al 2 O 3 is a sub-stable phase, the nucleation rate of α-Al 2 O 3 is lower than that of γ-Al 2 O 3 at high cooling, and γ-Al 2 O 3 is easily formed in the outer layer of the specimen at high cooling [29,30].…”
Section: Phase Analysismentioning
confidence: 99%
“…α-Al 2 O 3 is a stable phase and γ-Al 2 O 3 is a sub-stable phase, the nucleation rate of α-Al 2 O 3 is lower than that of γ-Al 2 O 3 at high cooling, and γ-Al 2 O 3 is easily formed in the outer layer of the specimen at high cooling [29,30]. However, α-Al 2 O 3 is easily formed in the inner holes and other film layers due to the small contact area with electrolyte and low thermal conductivity [14]. Therefore, the number of γ-Al 2 O 3 peaks in the figure is in the majority.…”
Section: Phase Analysismentioning
confidence: 99%
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“…Introduction 6061 aluminium alloy is a kind of reinforced alloy with high heat treatment strength, which has excellent machining performance and good welding characteristics. Its main elements are Mg and Si, also Mg 2 Si phase can be formed in the heat treatment, while Mg 2 Si can melt into aluminium to achieve the effect of artificial age-hardening [1,2]. So 6061 aluminium alloy can be applied in aerospace, electronics, automotive, construction and other industries.…”
mentioning
confidence: 99%