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- W3003649943 abstract "The galvanic corrosion of the β -phase (Al 3 Mg 2 )/Al couple has been studied using electrochemical methods, scanning vibrating electrode technique (SVET) and Time of flight-secondary ion spectroscopy (ToF-SIMS). Polarization tests reveal that Al 3 Mg 2 is anodic relative to pure Al at pH ≤ 10. Visualization of the current density distribution over the Al 3 Mg 2 /Al galvanic couple by SVET reveals that at pH 2, an intense and stochastic anodic current density is evolved from Al 3 Mg 2 while a heavy cathodic current flux is sustained on the surrounding Al matrix. At pH 6 and 10, localized both cathodic and anodic regions are seen on Al 3 Mg 2 indicating its self-dissolution while the surrounding Al matrix remained relatively inert. However, at pH 13, a reversal of polarity occurs and Al 3 Mg 2 becomes cathodic relative to Al. The severity of the galvanic coupling of Al 3 Mg 2 to Al is in the order pH 13 > pH 2 > pH 6 > pH 10. ToF-SIMS analysis reveals that the dealloying of Al 3 Mg 2 in the galvanic couple is by selective dissolution of Mg leading to the deposition of corrosion products dominated by Mg compounds in an acidic and neutral environment. In an alkaline environment, a relatively thin hydroxide rich film is formed." @default.
- W3003649943 created "2020-02-07" @default.
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- W3003649943 date "2020-01-28" @default.
- W3003649943 modified "2023-09-27" @default.
- W3003649943 title "SVET and ToF-SIMS Studies on the Galvanic Corrosion of β-phase/Aluminum Couple in Aqueous Solutions as a Function of pH" @default.
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- W3003649943 doi "https://doi.org/10.1149/1945-7111/ab6a66" @default.
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