Abstract
In this study, we report on the corrosion behavior of hybrid steel/glass fiber-reinforced polymer (GFRP) composite pipes under harsh corrosive conditions for prolonged durations. Specimens were immersed in highly concentrated solutions of hydrochloric acid, sodium chloride, and sulfuric acid for durations up to one year. Detailed qualitative analysis using scanning electron microscopy (SEM), X-ray diffraction analysis (XRD), and energy-dispersive X-ray spectroscopy (EDX) is presented. It is shown that the hybrid pipes have excellent corrosion resistance with a corrosion rate of less than 1% of the corrosion rate for conventional steel pipes. That low corrosion rate can be attributed to the formation of pores in the GFRP layer due to increased absorption and saturation moisture in the material with increased soaking time. This can be reduced or even prevented through a more controlled process for fabricating the protective layers. These promising results call for more utilization of GFRP protective layers in novel design concepts to control corrosion.
Highlights
We evaluate the corrosion behavior of GFRP/steel under long-term- up to one year- immersion tests in different acidic environments, including hydrochloric acid, sodium chloride, and sulfuric acid solutions with 0.5M concentrations
Some yellowing signs have been observed at the surface of the GFRP/steel pipes immersed in the hydrochloric acid (HCl) solution
The results demonstrated that the GFRP/steel pipes have excellent corrosion resistance compared to uncoated carbon steel pipes
Summary
Significant efforts and financial resources are devoted to addressing corrosion by developing new methods, materials, and technologies that can eliminate or delay corrosion of metallic components [2]. Both corrosion and abrasion cause significant losses and decrease the structural integrity of pipelines [3]. Oil and gas generally transmit several impurities that are corrosive under many conditions. These impurities might contain carbon dioxide (CO2 ) and hydrogen sulfide (H2 S) [5]. The effect of Chloride ion (Cl− ) concentration on corrosion rates and the interaction between Cl− and CO2 towards carbon steel corrosion, where chloride ion penetrates the imperfection and begins the process of pit initiation [6,7,8,9]
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