Corrosion inhibitor

C - Chemistry – Metallurgy – 23 – F

Patent

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Details

C23F 11/04 (2006.01) C09K 8/54 (2006.01) C23F 11/14 (2006.01)

Patent

CA 2482513

The corrosion inhibitor blend of at least one corrosion inhibitor base (which may be a Mannich reaction product), a solvent selected from the group consisting of C1 acids and ester and salt derivatives thereof, and optionally a surfactant, has been found to be effective as a corrosion inhibitor for metals in acid media, particularly fluids containing halogen acids. The corrosion inhibitor has improved performance over similar or identical corrosion inhibitor composi~tions where an alcohol such as methanol is used as a solvent. Suitable, non~limiting possibilities for the solvent include, but are not necessarily limited to formic acid, format salts, methyl format, ethyl format, benzyl format, format salts of amines, inorganic format, and mixtures thereof.

On a découvert que le mélange inhibiteur de la corrosion contenant au moins une base d'inhibiteur de corrosion (qui peut être un produit de la réaction de Mannich), un solvant sélectionné dans le groupe constitué d'acides C1, d'ester et de leurs dérivés de sel, et éventuellement un tensioactif est efficace comme inhibiteur de corrosion pour des métaux dans des milieux acides, particulièrement dans des fluides contenant des acides halogénés. L'inhibiteur de la corrosion est plus performant par rapport à des compositions semblables ou identiques d'inhibiteur de la corrosion dans lesquelles un alcool, notamment un méthanol, tient lieu de solvant. De préférence, le solvant peut contenir un acide formique, des sels de formate, un formate de méthyle, un formate d'éthyle, un formate de benzyle, des sels de formate d'amines, un formate inorganique et leurs mélanges, la liste n'étant toutefois pas limitée aux éléments précités.

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