A two-year study of corrosion and protection of ductile iron pipe. Field and laboratory evaluations of short and long term polarization rates. Corrosion rate reduction and cathodic current criterion. Benefits of the traditional, standard asphaltic shop coating. A database of 1379 inspections of buried iron water lines. Result: A risk based protection design strategy for buried ductile iron pipelines.
Since ductile iron (DI) pipes generally cannot be galvanized, inorganic zinc (IOZ) coatings can be considered to provide sacrificial corrosion protection in harsh atmospheric exposures, such as marine environments. The unique application of IOZ coating system provides an excellent cost-effective, long-term protection of atmospherically exposed DI pipes.