Influencing factors of various combinations of abrasion, cavitation, and corrosion caused by multiphase flow impact

Abstract

The surface of ships and other marine transportation equipment is abraded by sandy seawater when under operation. And with a change in speed, cavitation erosion will occur. Seawater has a corrosive effect on metal materials, and the form of damage to the surface materials of ships is the combined erosion of abrasion, cavitation, and corrosion. To study the influencing factors of various forms of erosion, an experimental device for combined erosion was developed. The effects of sand concentration, sand size, salt concentration, and impact speed on the various combinations of abrasion, cavitation, and corrosion of 0.45% C steel specimens are studied experimentally. The results showed that the degree of wear of the combined erosion of abrasion, cavitation, and corrosion was stronger than the combined erosion of abrasion and cavitation or single corrosion erosion. Abrasion, cavitation, and corrosion promote each other, which aggravates the wear of materials and accelerates the loss of material. Under the conditions of low sand concentration and low salt concentration, the mass loss of metal materials for various combinations of abrasion, cavitation, and corrosion was proportional to the sand concentration, sand size, salt concentration, and impact speed. The greatest factor of metal degradation was impact speed.