Abstract
Cermet-based coatings are being increasingly used to combat erosion-corrosion in oil and gas industries such that occurring in offshore piping, production systems and machinery involving fluid and/or slurry flowing corrosive media which often contain solid particles such as sand. This leads to material/ substrate damage caused by the combined surface degradation mechanisms of erosion and corrosion. This review assesses the erosion-corrosion resistance and performance of cermet coatings applied by different thermal spraying methods. Electrochemical measurements, which monitor the erosion-corrosion mechanisms and coating integrity by themselves and when both erosion and corrosion act simultaneously are considered. In addition, surface characterization, and the extent of weight loss that covered through different combinations of cermet were reviewed. This paper also discusses different types of substrates as well as the thermal spray coating processes that appeared in the majority of publications such as atmospheric plasma spraying (APS) and electric arc spray (EArc) with special emphasis on high velocity oxy-fuel (HVOF) with regard to cermets applied to enhance erosion and corrosion resistance of the substrate. Electrochemical polarization measurements and salt spray test to evaluate the erosion-corrosion mechanisms and coating integrity are used to quantify the synergistic effects present when both erosion and corrosion acting simultaneously.