Aspalter, A., Braidt, R., Duchoslav, J., Strauß, B., & Fafilek, G. (2024). Photo-induced processes on ZnO and its possible impact on cathodic delamination of organic coatings on galvanised steel. Electrochimica Acta, 494, Article 144453. https://doi.org/10.1016/j.electacta.2024.144453
The influence of sunlight on cathodic delamination of polymer-coated, galvanised steel is considered regarding the semiconductor properties of zinc passive layers. Zinc and galvanised steel were studied potentiostatically in O2-rich, moderate alkaline electrolyte under UV-, violet and green light. Currents increased instantaneously, intensity- and wavelength-dependant according to the photoeffect. After electrolyte preconditioning of galvanised, pre-treated and coated (6 µm) steel, light positively shifted the open-circuit-potentials (ocp). Mechanistic considerations are provided using Mott-Schottky-plots and Chopped Linear Sweep Voltammetry (CLSV). Under certain conditions, oxygen reduction reaction (ORR) intensification is found and should be considered in future studies of paint adhesion on zinc.
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Project title:
Ursachen von Lackdelamination auf Zinkoberflächen: TUW_E164-04-2-01/2021 (VOEST-ALPINE Industrieanlagenbau GmbH & Co)
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Research Areas:
Metallic Materials: 20% Materials Characterization: 20% Surfaces and Interfaces: 60%
CC BY 4.0
