Methods for corrosion control

C - Chemistry – Metallurgy – 23 – F

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C23F 11/167 (2006.01) C23F 11/16 (2006.01)

Patent

CA 2661543

A method is taught for protecting steel parts from corrosion due to exposure to a corrosive aqueous environment. The method comprises adding a first quantity of organic sulphur salts to the corrosive aqueous environment, wherein the first quantity of organic sulphur salts react with iron, formed from corrosion of the steel parts, to form a passive iron-sulphur barrier. A second quantity of organic sulphur salts is added to the aqueous medium over the life of the steel parts to maintain a predetermined sulphur concentration in the corrosive aqueous environment to maintain the passive barrier. Also taught is the use of organic sulphur salts in protecting steel parts from corrosion due to exposure to a corrosive aqueous environment.

Cette invention porte sur un procédé qui est enseigné pour la protection de pièces en acier vis-à-vis de la corrosion due à une exposition à un environnement aqueux corrosif. Le procédé comporte l'addition à l'environnement aqueux corrosif d'une première quantité de sels organiques de soufre, la première quantité de sels organiques de soufre réagissant avec le fer, formé par la corrosion des pièces en acier, pour former une barrière passive fer-soufre. Une seconde quantité de sels organiques de soufre est ajoutée au milieu aqueux au cours de la vie des pièces en acier pour maintenir une concentration en soufre prédéterminée dans l'environnement aqueux corrosif afin de maintenir la barrière passive. L'invention concerne également l'utilisation des sels organiques de soufre dans la protection de pièces en acier vis-à-vis de la corrosion due à l'exposition à un environnement aqueux corrosif.

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