抄録
Sewerage systems have recently come into wide use in Japan. The pipes and fittings in the systems are exposed not only to the corrosive environment but also to the impact of solid particles contained in the mud drain resulting in erosive wear on the surface. To cope with the trouble, it is intended to replace the traditionally often used iron and steel pipes with those of polymers which have excellent anti-corrosion properties. In this study, slurry erosion test were carried out using a Jet-in-slit apparatus on seven kinds of polyethylenes, three kinds of other polymers and two kinds of iron and steels taking it thoroughly into account that the erosion damage depends remarkably on the particles impact angle. As a result, all the polyethylenes showed an excellent anti-erosion properties as compared with other materials for whole range of particles impact angle. Further, a model was proposed to account the impact angle dependency of the erosion damage. Basing on the model it was made clear why the erosion rate of the polyethylenes were satisfactory correlated with a complex parameter in which the fracture energy and the elastic modulus were combined.
