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Using Electrochemical Impedance Spectroscopy to Evaluate Corrosion Behavior of Painted Galvanized Steel in Atmospheric and Soil Exposure

A review of galvanized steel and painted galvanized steel processes is provided, as well as the fundamentals and requirements for painted galvanized steel products. The corrosion processes found with both galvanized steel and painted galvanized steels are discussed.  

Product Number: 41206-295-SG
Author: Mehrooz Zamanzadeh, George T. Bayer, Gordon Kirkwood
Publication Date: 2006
Industry: Coatings
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A review of galvanized steel and painted galvanized steel processes is provided, as well as the fundamentals and requirements for painted galvanized steel products. The corrosion processes found with both galvanized steel and painted galvanized steels are discussed.  In the evaluation of painted galvanized steels, various laboratory techniques have proven most useful, with electrochemical impedance spectroscopy (EIS) as a sensitive quantitative technique for measuring coating degradation and corrosion protection.  A detailed overview of the EIS technique is provided.  Two case studies are provided for the laboratory evaluation of replacement and repair coatings for painted galvanized structures, featuring EIS and other laboratory techniques.

A review of galvanized steel and painted galvanized steel processes is provided, as well as the fundamentals and requirements for painted galvanized steel products. The corrosion processes found with both galvanized steel and painted galvanized steels are discussed.  In the evaluation of painted galvanized steels, various laboratory techniques have proven most useful, with electrochemical impedance spectroscopy (EIS) as a sensitive quantitative technique for measuring coating degradation and corrosion protection.  A detailed overview of the EIS technique is provided.  Two case studies are provided for the laboratory evaluation of replacement and repair coatings for painted galvanized structures, featuring EIS and other laboratory techniques.

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