Patent ID: 8221839

Claim:
A process for the application of a monolayer or multilayer anticorrosion coating to a metal substrate forming part of a pipe or of a fitting of a pipeline intended to be buried or immersed for the transportation of fluids, such as water, petroleum products, gas or drainage products, said process comprising the steps of: a) solely mechanically preparing a surface of the substrate, said preparing step including blasting by projection of abrasives; b) applying to the prepared surface an adhesion promoter composed of an aqueous solution of at least one silane, without additional chemical treatment other than steps c) and d); c) applying a layer of powder paint based on epoxy resin to the surface coated with the adhesion promoter; and d) applying at least one heat treatment to at least the surface of the substrate, wherein at least one stage d) of said at least one heat treatment is carried out between stages a) and b) or between stages b) and c), at a temperature of between 150 degrees Celsius and 250 degrees Celsius.