Some Aspects of the Electrochemical Behavior of Zinc in the Presence of Acrylate and Methacrylate Anions

Abstract

The influence of acrylate and methacrylate anions on the anodic behavior of zinc in concentrated sodium hydroxide solution at ambient temperature and under quiescent conditions has been studied using cyclic linear sweep voltammetry. The effect that these additives have on the corrosion rate of the zinc electrode, and on hydrogen evolution in particular, is examined. Experiments show that although the organic species exhibit a marked over‐all catalytic effect on both zinc dissolution and hydrogen evolution, the corrosion rate is little affected. Despite an apparent deleterious effect on passivation, results suggest that the additives improve the solubility of the anodic product in the electrolyte. A mechanism is tentatively suggested for the catalytic evolution of hydrogen.

Passivity of ?-brass (Cu?Zn/67?33) and its breakdown in neutral and alkaline solutions containing halide ions

“…5 where no additional reduction peak is shown beside that corresponding to Cu(I) reduction after the scan reverse at -1.00V (cycle 3). The anodic and cathodic peaks at -1.3V to -1.0V are related to zinc in e-brass [27,28].…”

“…Generally, the peak resolution and height increase with alkali concentration. The potential scan in the anodic direction was always started at a present potential, E~ = --1.00V which is more anodic to the peaks corresponding to the oxidation of Zn [27,28]. Thus the electrode surface is assumed to be covered with Zn(OH)z layer before the potential scan.…”

“…The cathodic peaks are interpreted as: (a) Peak C1, corresponding to the reduction of Cu(II) species to Cu(I) [29][30][31]; (b) Peak C2, including the reduction of Cu(I) species to Cu(O) [29,[32][33][34][35]; (c) Peak C4, connected with the reduction of Zn(II) species to Zn(O); [27,28] and (d) Peak C3, corresponding to the reduction of Cu(III) species to Cu(II), usually observed for copper [32,35] but which does not appear clearly in the cyclic voltammograms depicted in Figs. 1, 2.…”