Anodic oxidation of Al–Ag alloys

Páez, Maritza; Sandoval, Armando M.; Sepulveda, Y.; Monsalve, Alberto; Skeldon, P.; Thompson, G.E.; Zhou, Xiaorong

doi:10.1016/s0010-938x(02)00084-7

Cited by 8 publications

(3 citation statements)

References 12 publications

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“…the atomic ratio of silver to aluminum in oxide is between 0.3 and 0.9 times that in the alloy +1 Ref. [61] 0.6 at.% +1 0.9 at.% +1 1.2 at.% +1…”

Section: Doped Al 2 O 3 Thin Film Compositionmentioning

confidence: 99%

“…In contrast to copper, the nobler, as is commonly believed, silver lowers the pitting potential when homogeneously dissolved in aluminum [60]. When barrier oxide films were formed on Al-Ag, Paez et al [61] found accumulation of silver beneath the metal-oxide interface, the presence of silver in the oxide and at the surface of the oxide, in some cases. Accumulation of alloying elements is also influenced by surface pre-treatments which are commonly applied to copper [62,63] and to zinc [64] containing aluminum alloys.…”

Section: Introductionmentioning

confidence: 99%

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Porous and Ag-, Cu-, Zn-Doped Al2O3 Fabricated via Barrier Anodizing of Pure Al and Alloys

Poznyak,

Knörnschild,

Hoha

et al. 2024

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The paper breaks the general concepts and shows that pore formation is possible in anodic aluminum barrier oxide by anodizing of pure Al, and also presents the results of electrochemical anodizing in boric acid and citrate buffer aqueous solutions of homogeneous binary alloys AlCu (4 wt.%), AlZn (3 wt.%) and AlAg (5.2 wt.% and 16.2 wt.%). Barrier anodizing allowed obtaining Al2O3 thin films doped with copper, zinc and silver. The anodizing behavior and the effect of anodic current density on the charge were studied, and scanning electron microscopy, X-ray photoelectron spectroscopy and Auger electron spectroscopy analyses were performed. The doped alumina thin films, which are a mixture of Al2O3, Cu2O, ZnO, Ag2O, AgO and promising double metal oxides CuAlO2, AgAlO2 and ZnAl2O4, are promising for use as resistive switching, photoelectron, mechanical, photo-thermoelectric and fluorescence materials; sensors; and transparent conductive and photocatalyst films.

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“…the atomic ratio of silver to aluminum in oxide is between 0.3 and 0.9 times that in the alloy +1 Ref. [61] 0.6 at.% +1 0.9 at.% +1 1.2 at.% +1…”

Section: Doped Al 2 O 3 Thin Film Compositionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Porous and Ag-, Cu-, Zn-Doped Al2O3 Fabricated via Barrier Anodizing of Pure Al and Alloys

Poznyak,

Knörnschild,

Hoha

et al. 2024

Coatings

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“…This results in the formation of Ag2O and the clusters of oxidized Ag will be deposited on an anodic film without enrichment. Ag + ions migrate faster than Al 3+ ions in Al-Ag alloy [16]. In Al-Ag alloy, Ag2Al precipitates are formed, called γ phase, which are responsible for a decrease in corrosion resistance of the alloy.…”

Section: Introductionmentioning

confidence: 99%

Pitting Corrosion in AA7075 Friction Stir Welds on Minor Additions of Silver

Vikas¹,

Narasimha

Bhavani

et al. 2021

J. Eng. Technol. Sci.

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AA7075 is extensively used in aerospace, defense, automotive applications because of its high strength to weight ratio. Issues related to fusion welding and corrosion resistance are key problems associated with these alloys. Friction stir welding is an alternative welding technique that overcomes problems associated with fusion welding. In the present investigation, preliminary studies were done on pitting corrosion behavior of AA7075 friction stir welds by adding silver along the weld joint line. Silver paste was applied along the longitudinal direction of AA7075-T6 rolled plates of 6-mm thickness and cured at 130 °C for 30 seconds. Weld joints were prepared at two different tools rotational speeds, i.e., 750 rpm and 1000 rpm, while keeping other parameters fixed. Welded joints were cut as per the required sizes to study the hardness, microstructure, and pitting corrosion resistance in various regions. It was observed that the hardness was not much affected, but pitting corrosion resistance substantially improved by trace addition of silver. In the stir zone and the thermo-mechanically affected zone, onion ring type marks were observed. Grain refinement in the stirred zone (SZ) was higher at 750 rpm compared to 1000 rpm. The increased hardness in the welds was due to grain refinement. All the observed results were correlated with microstructural features as evidenced by optical microscopy.

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