1. Electrochemical properties of corrosion products formed on Zn-Mg, Zn-Al and Zn-Al-Mg coatings in model atmospheric conditions
- Author
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Tomas Prosek, Dominique Thierry, Andrej Nazarov, Jiri Oswald, Pavel Kriz, and J. Stoulil
- Subjects
Kelvin probe force microscope ,Materials science ,Magnesium ,Mechanical Engineering ,Metallurgy ,Zincite ,technology, industry, and agriculture ,Metals and Alloys ,chemistry.chemical_element ,General Medicine ,Zinc ,Electrochemistry ,Surfaces, Coatings and Films ,Dielectric spectroscopy ,Corrosion ,chemistry ,Chemical engineering ,Mechanics of Materials ,Aluminium ,visual_art ,Materials Chemistry ,visual_art.visual_art_medium ,Environmental Chemistry - Abstract
The electrochemical properties of corrosion products formed under sodium chloride deposits on zinc coatings alloyed with aluminium and magnesium have been studied using impedance spectroscopy (EIS), scanning Kelvin probe (SKP) and photoluminescence (PL) techniques. The low-energy band gap identified in corrosion products on hot-dip galvanized steel was associated with their higher electric conductivity and efficiency of the rate-controlling oxygen reduction reaction. It was attributed to the presence of ZnO, zincite. The formation of ZnO was hindered by the alloying. The alloyed coatings were covered by more compact layers of corrosion products with lower electric conductivity and better barrier properties.
- Published
- 2015
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