SILVA, T. C. ; Margarit-Mattos, I.C.P. ; NASCIMENTO, A. V. .
Resumo: Harsh conditions in petroleum industry include temperature variation during service of in-side coated equipments. Ranking coatings for this purpose is a hard task, demanding expensive and long-term testings. The aim of this paper is to study the behavior of composite anticorrosive coatings when subjected to temperature variations. The methodology consists in comparing the performance of coatings provided by recognized brands subjected to corrosion test with immersion at room temperature and immersion with variation of temperature. During corrosion testing EIS, pull-off adhesion measurements and SEM are made to characterize performance. Mechanical dynamic analysis was employed to compare thermo-mechanical properties of new and aged coatings, seeking relationship between these properties and performance in corrosion testing. It is observed that the classification of performance is related with the relative change of the complex modulus magnitude between glassy and rubbery states for each coating. This result suggests that this can be one source of damage generation in the studied composite coatings and can justify the inclusion of this methodology in the selection criteria of coatings to be used in conditions involving thermal variations.
