ABSTRACT
In the oil fields of North District in Venezuela, one of the common characteristics is the high temperature of the oil (up to 150 °:C) that has a di rect impact on the performance of the pipeline’s coating. Internal and external corrosion are the common problems in the performance of these flowline systems. In the past 10 years, one solution used to mitigate the external corrosion in the pipelines has been with the use of liquid epoxy resin-based coatings. Nevertheless, beside the use of liquid epoxy coatings, very little is known however about the degradation of these coatings at high temperatures. The main purpose of this paper is to present some results of thermal and thermo-oxidative ageing of five different types of liquids coatings systems (A, B, C, D and E). For this evaluation, we prepared coupons of carbon steel coated with all the organic coatings system. Differential scanning calorimetry (DSC), Aging tests, Thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR) measurements, Scanning electron microscopy (SEM), and Cathodic disbondment (CDT) were performed in order to classify the thermal degradation of the coating systems. Results show an influence of the aging conditions on coating embrittlement.
