Abstract
Hydraulic damage tests have been carried out on five types of non-metallic coating materials in slurry water. A rotating disk test rig was used to simulate silt abrasion and cavitation erosion with natural silt at periphery speeds of 30 and 40 m s −1. The resistances of the various coatings to silt abrasion, and the combination of abrasion and cavitation, have been measured and compared under specified hydraulic conditions. The tests show that among the five selected materials, epoxy resin reinforced by synthetic corundum particles and castable polyether-based polyurethane rubber were the most resistant coatings to abrasion and the combined abrasion-cavitation damage, respectively. It has also been found that of the materials tested, high elasticity polyurethane had the greatest resistance to cavitation, whilst a brittle material, epoxy resin, had the least in high-silt-content water. The erosion rates of the coatings examined were generally proportional to the peripheral speed of the disk raised to the power of 3.1–4.5 under the given conditions. The synergistic effect of cavitation and abrasion on different coating materials has been discussed.
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