Desempenho de tintas anticorrosivas em revestimento de aço-carbono SAE 1020

Abstract

The accelerated test is the dependency of the material to a certain type of destructive effort, under controlled conditions, in order to observe its efficiency during the test. These destructive efforts can be mechanical stresses, UV light, relative humity, salt spray, among others. The present work had the purpose of comparing the protection efficiency of different anticorrosive paints, used by the internship company, on the outer casing of their power transformers. The accelerated test utilized was the salt spray or salt fog test, based on ASTMB 117 standard. In order to know the surface and composition of the metallic substrate (SAE 1020 carbon steel) and primers and finishing paints, optical microscopy, Scanning Electron Microscopy (SEM), X-ray Energy Dispersion Spectroscopy (EDS) and confocal microscopy analysis were performed. The characterization of the specimens during corrosion monitoring was performed by photographic records, thickness, roughness and adhesion tests. (Data not disclosed by the Author). The salt spray test was effective to show that the standard painting scheme (standard primer and finishing paint) had a inferior performance when compared to the painting scheme designed for power transformers located at the seafront.