Performance Comparison of Thermal-Sprayed Coatings for Ductile Iron Pipe

Abstract

In several countries, Zn and Zn/Al 85/15 coatings applied by thermal spray are used to protect underground ductile iron (DI) pipe against soil corrosion. In this study, DI pipe samples were coated with Zn and Zn/Al 85/15. Test results showed that Zn/Al 85/15 coatings have better corrosion resistance than Zn coatings and the annealing oxide on DI pipe acts as a good corrosion-resistant protective layer.