Influence of surface treatments in the initial stages of anodizing Al–Ag alloys in neutral electrolytes

Riveros, Viviana; Gulppi, Miguel; Páez, Maritza; Zagal, José H.; Rangel, C. M.; Huerta, D.; Skeldon, P.; Thompson, G.E.

doi:10.1007/s10008-005-0659-5

Cited by 3 publications

(2 citation statements)

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“…The corrosion tests in a 3.5% NaCl solution at room temperature revealed pitting areas in the Al matrix around Ag2Al intermetallic precipitates [98,100]. Damaging of the barrier film on the aluminum surface in the vicinity of silver-rich intermetallic sites was also claimed in [101]. And the results from [99] demonstrated the creation of a nanoporous Ag structure via the promoted dissolution of Al from the Al-Ag alloy in a 1 M NaCl solution.…”

Section: Introductionmentioning

confidence: 99%

Silver-Assisted Hydrogen Evolution from Aluminum Oxidation in Saline Media

Buryakovskaya,

Maslakov,

Borshchev

et al. 2024

Molecules

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A swarf of aluminum alloy with high corrosion resistance and ductility was successfully converted into fine hydro reactive powders via ball milling with silver powder and either lithium chloride or gallium. The latter substances significantly intensified particle size reduction, while silver formed ‘cathodic’ sites (Ag, Ag2Al), promoting Al corrosion in aqueous saline solutions with hydrogen generation. The diffraction patterns, microphotographs, and elemental analysis results demonstrated partial aluminum oxidation in the samples and their contamination with tungsten carbide from milling balls. Those factors were responsible for obtaining lower hydrogen yields than expected. For AlCl3 solution at 60 °C, Al–LiCl–Ag, Al–LiCl, Al–Ga–Ag, and Al–Ga composites delivered (84.6 ± 0.2), (86.8 ± 1.4), (80.2 ± 0.5), and (76.7 ± 0.7)% of the expected hydrogen, respectively. Modification with Ag promoted Al oxidation, thus providing higher hydrogen evolution rates. The samples with Ag were tested in a CaCl2 solution as well, for which the reaction proceeded much more slowly. At a higher temperature (80 °C) after 3 h of experiment, the corresponding hydrogen yields for Al–LiCl–Ag and Al–Ga–Ag powders were (46.7 ± 2.1) and (31.8 ± 1.9)%. The tested Ag-modified composite powders were considered promising for hydrogen generation and had the potential for further improvement to deliver higher hydrogen yields.

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Section: Introductionmentioning

confidence: 99%

Silver-Assisted Hydrogen Evolution from Aluminum Oxidation in Saline Media

Buryakovskaya,

Maslakov,

Borshchev

et al. 2024

Molecules

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“…Very few investigators have studied the corrosion behavior of Al-Ag alloys. From the literature, it is evident that the age hardening of Al-Alloy produces silver-rich intermetallic precipitates in the matrix and these precipitate sites favor the generation of oxygen [15]. This results in the formation of Ag2O and the clusters of oxidized Ag will be deposited on an anodic film without enrichment.…”

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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