The CO2 internal corrosion is a major challenge facing the oil and gas industry. In order to protect the
pipelines and equipment from the ravages of CO2 corrosion, novel sacrificial coatings can be used. The
objective of this study was to investigate the corrosion behavior of Al-based alloys as sacrificial
coatings for protection of pipeline in a CO2-saturated aqueous electrolyte (3.5 wt.% NaCl) at 4 bar CO2
pressure (3 barg) and 40 °C. The corrosion resistance of Al-based alloys and thermal spray coatings
was evaluated in an electrochemical reaction autoclave (ERAC) using electrochemical methods
(potentiodynamic polarization, linear polarization resistance (LPR) and electrochemical impedance
spectroscopy (EIS)). The post-corrosion surface characterization was performed by scanning electron
microscopy (SEM) equipped with energy dispersive X-ray spectroscopy (EDS). The obtained data show
Al-based alloy demonstrated promising corrosion protection against CO2 corrosion with no breakaway
degradation issues.