LAUSR

Abstract The purpose of this investigation was to document and understand the erosion corrosion of X80 pipeline steel under different angles of attack in two-phase flow impingement. The erosion corrosion behavior of X80 pipeline steel was studied by using sand jet. The weight loss, surface morphology and electrochemical performance of X80 pipeline steel under different angles of impact (30°, 45°, 60°, 75°, 90°) were studied at 12 m/s flow rate. The synergistic mechanism of erosion corrosion of X80 pipeline steel under different environment was analyzed. The experimental results show that the weight loss of the sample in pure water increased with the decrease of the impact angle. The weight loss of the sample in the sodium chloride solution decreased first and then increased with the decrease of the impact angle, reaching a minimal value at 60° impact angle. Positive synergy was observed at all impact angles, and synergy was most significant when the impact angle was 90°. The samples impacted at 30° showed the best corrosion resistance by electrochemical measurement. The corrosion resistance of the sample was consistent with the synergistic effect.