Experimental Study on the Effect of Impingement Angles and Velocities on Erosion-Corrosion Behavior of API 5L-X42 Carbon Steel in Eroded Flow Medium

Abstract

Experiments on erosion-corrosion performance characteristics of API 5L X 42 carbon steel material have been conducted in aqueous medium at three impingement different angles of 25°, 45° and 90° and at the different high speeds of erosive liquid of 98, 153, and 182 m/s. Experiments have been carried out in tape water with constant sand concentration 5% of rig basin volume. Two sizes of irregular shape Silica coarse and soft sand have been used, whose coarse sand size has been 1160 µm, and soft sand size has been 185 µm in separated experiment and specimens. The durations of the experiments have been 300, 600, 900, 1200, 1500 and 1800 seconds. The surface roughness and the metal loss have been measured, and the morphology of the surface has been investigated and applied by scanning electronic microscope at various scales. The results of the study have concluded that the erosive liquid jet with soft sand has less effect on the erosion-corrosion rate in comparison with the effects of coarse sand. The highest erosion-corrosion rate has been recorded for coarse sand and at the sharper angles of 25° with the higher speed (182 m/s). Mathematical models for erosion corrosion rate have been developed for these experimental parameters.