Corrosion preventing buffer system for metal products

Details Corrosion preventing buffer system for metal products Corrosion preventing buffer system for metal products

C - Chemistry, Metallurgy

09

D

C09D 5/08 (2006.01) C23C 28/00 (2006.01) C23C 30/00 (2006.01) E04C 5/01 (2006.01) F16D 69/02 (2006.01)

Patent

CA 2203181

A system is disclosed for inhibiting the corrosion of ferrous and other metals by passivating the metals. The system includes novel buffered compositions which may be applied to metal products for preventing or retarding corrosion and methods for applying the buffered compositions to metal products such that corrosion protection of the products is achieved through passivation. The methods include an in-situ application to existing structures with metal reinforcement as well as applications to metal products during manufacture. Generally, the compositions may be in various forms and comprise a carrier component and one or more pH buffer components. The buffer is selected to retain the proximity of the metal at a pH at which the metal is passive to corrosion. The compositions are environmentally friendly and are capable of replacing chromates which have been traditionally used with zinc and zinc alloys to inhibit corrosion of metals but which are potentially harmful to the environment.

On décrit un système qui permet d'inhiber la corrosion de métaux, ferreux ou non, en les passivant. Ce système comprend de nouvelles compositions tamponnées qu'on peut appliquer sur des produits métalliques pour prévenir ou retarder leur corrosion, ainsi que des procédés qui permettent d'appliquer ces compositions tamponnées audits produits métalliques pour leur conférer par passivation une protection contre la corrosion. Ces procédés incluent l'application in-situ, sur des structures existantes dotées d'un renforcement métallique, ainsi que des applications effectuées sur des produits métalliques en cours de fabrication. De façon générale, ces compositions peuvent prendre différentes formes et inclure un vecteur et un ou plusieures composants de tampon pH. Un tampon est choisi de façon à rester à proximité du métal à un pH pour lequel ce métal est passif à la corrosion. Ces compositions respectent l'environnement et peuvent remplacer les chromates, traditionnellement utilisés avec le zinc et ses alliages pour inhiber la corrosion des métaux, mais qui se révèlent potentiellement dangereux pour l'environnement.

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