EIS INVESTIGATIONS OF ALKYD AND EPOXY COATINGS AS THEYARE CHEMICALLY STRIPPED FROM STEEL PANELS

摘要

Electrochemical Impedance Spectroscopy (EIS) has been employed to monitor, and model, realtimernchemical stripping and de-adhesion of select coatings from steel panels. Instead of therncustomary salt solution, a water based chemical stripper was used in a custom-built EIS cell. Inrneffect, the stripper was simultaneously used as the electrolyte for the EIS test as well as thernmodus operandi for stripping the coated panels.rnAlkyd (3 coats) and epoxy polyamide coatings (2 coats) were compared and contrasted during thernchemical stripping process. To examine the influence of pigment types in the coatings, a leafingrnaluminum alkyd finish in a 3 coat system was compared with an alkyd finish that containedrntitanium dioxide. The epoxy polyamide coating systems examined contained either non-leafingrnaluminum or titanium dioxide pigments.rnThe EIS data is discussed in terms of such multivariate factors as the pigment used in therndifferent coating types, the influence of coating chemistry and the unique chemistry of the waterrnbased chemical stripper.