Method for protecting a metallic substrate against corrosion

Details Method for protecting a metallic substrate against corrosion Method for protecting a metallic substrate against corrosion

C - Chemistry, Metallurgy

23

C

C23C 22/00 (2006.01) C09D 4/00 (2006.01)

Patent

CA 2326050

The invention relates to a method for protecting a metallic substrate against corrosion which results in the formation of a species X derived from the metal. A coating composition based on (hetero)polysiloxanes produced by hydrolysis and condensation is applied to the substrate and hardened. The inventive method is characterised in that said coating composition comprises at least one species Z which reacts or interacts with the metal to form a species Y. Species Y has a more negative enthalpy of formation than species X.

L'invention concerne un procédé pour protéger un substrat métallique de la corrosion, qui donne lieu à la formation d'une espèce X dérivée d'un métal. Selon ce procédé, une composition de revêtement à base d'(hétéro)polysiloxanes obtenus par hydrolyse et condensation est appliquée sur le substrat et est durcie. Ce procédé se caractérise en ce que la composition de revêtement comprend au moins une espèce Z qui réagit ou entre en interaction avec le métal, ce qui donne lieu à la formation d'une espèce Y qui présente une enthalpie de formation plus négative que l'espèce X.

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