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Short-term deterioration of polymer-coated 55% Al-Zn: Part 3: Protective mechanism of inhibitor-modified coatings

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<mark>Journal publication date</mark>1999
<mark>Journal</mark>Corrosion Science
Issue number3
Number of pages8
Pages (from-to)278-285
Publication StatusPublished
<mark>Original language</mark>English


Electrochemical impedance spectroscopy (EIS) was used to investigate 55% Al-Zn coated with different thin polymer coatings (= 1 um) containing a passivating inhibitor (CrfVIl) after exposure to a sodium chloride (NaCl) solution for variable times. Impedance data were analyzed using a model developed previously. Investigation of the effects oj polymer layer thickness, chromate concentrations, and polymer particle dimensions revealed the different aspects of the protective principle ojthis new type oj thin-film coating on 55% Al-Zn-coated sheet steel. Evolution of the coating behavior over time was studied in depth. © 1999, NACE International.