double layer coating, articles, method of manufacturing a double layer coating, powder composition and coating layer

摘要

The invention provides a powder coating composition comprising thermoplastic polymers, ceramic particles, cermet particles to decrease the coefficient of friction, and to improve wear and corrosion resistance of high temperature, high pressure coated surfaces, and corrosive environments. It also provides a coating application method for improving the adhesion of the coating to the substrate. The coating compositions are devoid of volatile organic solvents and may be applied to surfaces using thermal spraying, compression molding and other particle sintering approaches. A multilayer architecture consisting of an adhesive lower layer and a non-adhesive low friction upper layer is disclosed. The coating can be used in oil and gas production and seawater injection.