Corrosion preventing pigment and composition.

摘要

Disclosed is a method for preventing the corrosion of a metal material, comprising contacting the metal material with an environment containing phosphate ions and soluble ions of vanadium in the presence of water and oxygen. Also, disclosed is a corrosion preventive pigment comprising a phosphate ion source and a soluble vanadium ion source and generating a soluble vanadium ion and a phosphate ion when contacted with water and oxygen. The pigment can be produced by mixing a phosphate compound and a vanadium compound or by melting a mixture of a phosphate compound, a vanadium compund, optionally a network modifier ion source and a glassy material followed by grinding. Further disclosed is a corrosion preventive coating composition comprising a phosphate ion source generating phosphate ions in the presence of water and oxygen, a vanadate ion source generating vanadate ions in the presence of water and oxygen and a film-forming resin.