82 research outputs found

    Transference numbers of aqueous HCl up to 15 mol-kg-1 at 25°C : a systematization and reassessment

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    Ion-transfer parameters of aq. hydrochloric acid over a wide molality range have been re-investigated taking the concurrent solvent-transfer into due account. In this context, the transference nos. for the hydrogen ion τH and for water τw have been detd. from 10-2 to 15 mol-kg-1, together with the corresponding infinite-diln. values τH0×w0, by processing a set of nearly a hundred emf. measurements (some twenty of them new for this work) on HCl concn. cells with transference with both cation-reversible and anion- reversible electrode pairs

    Inhibition of copper corrosion in high resistivity water- Characterization of the surface layers

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    This paper examines some characteristics of the surface layers formed on OHFC copper specimens prefilmed with 5-hexyl-1,2,3-Benzotriazole (C6-BTA) and then maintained for various times in high resistivity water (5 ppm O2, 1 ppm CO2) at 40 °C. The protectivity of the surface layers formed by prefilming treatments has been evaluated by various tmeasurements: recording of polarization curves, electrochemical impedance spectra, FTIR-reflection spectra, X-ray reflection spectra, XPS spectra. Some temptative interpretations of the very high protectivity obtained by the treatments with C6-BTA is carried out on the basis of the overall results
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