Evaluation of the Adhesive Properties of Downhole CorrosionResistant Polymeric Coatings Determined by Cathodic Disbondment

摘要

Cathodic Disbondment (CD) of commercially available polymeric coatings has been investigated usingrna truncated version of the ASTM standard G8-96; one thermoplastic, unfilled polyamide and twornthermosetting, filled epoxy based coating systems of two different thicknesses each were studied. Forrnthe purpose comparison, delamination tests were performed on all the coatings using a standardrnVickers indenter with a 40 kg weight. The truncated version of the CD test was shown to be effectivernin evaluating the adhesive properties of the coatings. It was observed that the surface preparationsrnapplied to the substrate, before coating was deposited complicated the analysis of the CD test results.rnOverall, a good agreement was observed between the CD and the delamination indentation tests andrnthe coating systems have been ranked based on their performance in these test methods.