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Cathodic Corrosion of Zinc under Potentiostatic Conditions in NaCl Solutions
Author(s) -
Prestat Michel,
Soares Costa Josiane,
Lescop Benoit,
Rioual Stéphane,
Holzer Lorenz,
Thierry Dominique
Publication year - 2018
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201701325
Subject(s) - cathodic protection , zinc , corrosion , electrochemistry , polarization (electrochemistry) , materials science , dissolution , x ray photoelectron spectroscopy , anode , raman spectroscopy , electrode , scanning electron microscope , inorganic chemistry , metallurgy , chemical engineering , chemistry , composite material , physics , optics , engineering
Zinc electrodes were polarized cathodically at moderate overpotentials in NaCl 0.6 M solutions under potentiostatic conditions for 7 to 17 hours at room temperature. Corrosion products were characterized by using optical microscopy, XRD, Raman microscopy, XPS, and FIB‐SEM. Close to the open‐circuit potential, the corrosion products were formed by simonkolleite and the electrochemical response exhibits anodic features. At more negative potentials, the current density remains cathodic throughout the polarization and the deposits on the electrode surface consist almost solely of ZnO. The soluble zinc species necessary for ZnO deposition originate from localized dissolution of the substrate in the form of pits. This effect is assigned to the strong alkalinization of the surface due to oxygen reduction. Despite developing greater surface area than bare zinc substrates, the nanostructured ZnO deposits reduced the cathodic activity.