Study of Corrosion and Corrosion Inhibition of Chromate and Chromate-Free Primers

TL;DRAbstract

Chromate and chromate-free primers were characterized in this study.For chromate primer examined, PPG EWEDA 144A (Pittsburgh Plate Glass Company), SrCrO 4 was the active inhibitor.The three chromate-free primers examined were Deft 02GN084, Hentzen 16708 TEP and Sicopoxy 577-630.In the Deft product, the active inhibitor was PrO/ Pr(OH) 3 .CaSiO 3 was the active inhibitor for Hentzen 16708 TEP and BaSO 4 for Sicopoxy 577-630.How each pigment reacted within its coating environment during exposure was an object of study and primers coatings were characterized by several techniques.Focused ion beam (FIB) milling was used to prepare cross sections for energy dispersive x-ray analysis (EDX) to identify pigments and inhibitors derived from them.A Matlab TM program was developed to analyze the resulting EDX maps to characterize the dispersion of elements in inhibitor ions produced by pigment dissolution during exposure.Pigment characteristics and pigment dissolution varied widely from primer to

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