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- W1968899996 abstract "Galvanostatic cyclic anodic and cathodic polarization curves for four CuZn alloys are traced in alkaline solutions of different concentrations. The anodic behaviour of the first three alloys, with 15.9, 46.8 and 50.5 wt% Zn, resembles that of pure Cu. Oxidation arrests, corresponding to the formation of Cu2O, Cu(OH)2, HCuO2− and Cu2O3, are recorded before the evolution of O2 on the passive electrode. The Zn of the electrodes does not develop its oxidation arrest. It affects, however, the behaviour of the alloys in a number of ways. The results are explained on the basis of kinetic interactions, and in relation to the phase diagram of the Cu-Zn system. The fourth alloy, with 85.9 wt% Zn (ε + η phases), yields upon oxidation in concentrated alkali solutions a series of five or six arrests. The first two of these represent the oxidation of the Zn of the η- and ε-phases, respectively. Calculations have shown that the activity of the Zn in the ε-phase is ∼ 4.6 × 10−10 times that of the free η-phase. The other oxidation steps correspond to the oxidation of the Cu of the alloy. In 0.1N NaOH the same alloy behaves as if it was pure Zn. Critical current densities for the passivation of Cu, Zn and the four alloys are determined in 0.1M Na2SO4. The ability of the tested materials to withstand electrochemical dissolution decreases in the succession: Alloy I > Alloy III > Cu > Alloy II > Alloy IV > Zn." @default.
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- W1968899996 date "1977-01-01" @default.
- W1968899996 modified "2023-10-05" @default.
- W1968899996 title "The behaviour of copper-zinc alloys in alkaline solutions upon alternate anodic and cathodic polarization" @default.
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- W1968899996 doi "https://doi.org/10.1016/0010-938x(77)90039-7" @default.
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