Performance Comparison of Thermal-Sprayed Coatings for Ductile Iron Pipe

Abstract

Ductile iron (DT) pipe is one of rhe most commonly used pipe materia ls for water tra nsmission se t-vi ce. The corrosion of metallic water m<Jins occurs because of several environmen tal conditions. 1•2 Common causes of corrosion on underground pipelines include low soil res istivity. anaerobic bacteria, dissi milar merals. differences in soil composition, differential acr::ttion or soil around the pipe, and st ray direct current from external sourccs.3 One method or protection ofDJ pipe aga inst COITOSion is Zn-based coatings .