Household sanitary drainage systems have recently come into wide use in Japan. The pipes and fittings in the systems are exposed not only to a corrosive environment but also to erosive wear of their inner surfaces due to the impact of solid matter contained in the waste liquid. Planners hope to solve this problem by replacing the iron and steel pipes currently in use with polymer pipes, which have excellent anti-corrosion properties. In this study, a jet-ion-slit apparatus was used to perform slurry erosion tests on seven kinds of polyethylenes, three other kinds of polymers, and two kinds of iron and steels, taking thorough account of the fact that erosion damage is remarkably dependent on the particle impact angle. All the polyethylenes showed excellent anti-erosion properties, as compared with the other materials, for a whole range of impact angles. A model was proposed to explain the impact angle dependency of the erosion damage. The model made it clear why the erosion rate of the polyethylenes correlated so well with a complex parameter combining fracture energy and elastic modulus.
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