Erosion-corrosion is a complex mechanism of material degradation resulting from interactions between electrochemical and mechanical processes. The consequences of erosion-corrosion are severe with economic penalties resulting from premature failure of components, increased downtime and increased maintenance costs.
The use of carbon steel in conjunction with corrosion inhibitors in preventing erosion-corrosion has been observed as an economically viable solution for oil and gas piping systems. In order to produce highly effective corrosion inhibitors for erosion-corrosion environment, it is important to understand how inhibitors act on each of the material loss components in erosion-corrosion. Although research into corrosion inhibition has been extensively conducted, there is less published work dealing with inhibitors retarding erosion-corrosion.
This paper is to evaluate the efficiency of a corrosion inhibitor under severe liquid-solid impingement. It investigates the adsorption properties of films in addition to the inhibitor action on the components of erosion-corrosion using surface analysis techniques. The experiments have been conducted using a jet impingement rig capable of producing a jet with velocity of 20m/s in a CO2-saturated environment. An assessment of the total damage is made using gravimetric techniques and visual observation. The performance of the inhibitor in this extremely aggressive erosion-corrosion condition is discussed. This paper will identify the role that inhibitors can play in reducing damage in addition to that caused by corrosion and improving erosion-corrosion performance.