GB/T 17456.2-2010 "Ductile cast iron pipe outer surface zinc coating - Part 2: zinc-rich coating with final finish" stipulates the technical requirements and thickness determination method of zinc-rich coating and final finish coating on the outer surface of ductile cast iron pipe. This standard applies to zinc-rich coating with final finish on the outer surface of ductile cast iron pipe, aiming to ensure the anti-corrosion performance and service life of the coating. The standard is managed by the China Iron and Steel Association. It was released on January 10, 2011 and implemented on October 1, 2011.