A forming limit curve for the corrosion resistance of coil-coatings based on electrochemical measurements
By A.C. Bastos and G. Grundmeier and A.M.P. Sim
Published in Progress in Organic Coatings
NULL
2015
Abstract
Forming limit curves (FLCs) are useful tools to predict the safe forming limits of metal sheet. However, existing \FLCs\ are limited to bare metal and the increasing use of pre-painted metal sheet (coil-coatings) requires new limits that take into account the corrosion resistance. In this work electrochemical impedance spectroscopy (EIS) was used to characterise the degradation of a coil-coated system in different states of deformation (uniaxial, biaxial and plane strain). The \EIS\ data provided information about the condition of both paint and metal substrate and was used to devise criteria for minimum acceptable protection. A \FLC\ was produced based on those criteria and its predictions were compared with the degradation of a model deep-drawn cup.
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