Process for the demulsifying cleaning of metallic surfaces

Details Process for the demulsifying cleaning of metallic surfaces Process for the demulsifying cleaning of metallic surfaces

C - Chemistry, Metallurgy

23

G

C23G 1/14 (2006.01)

Patent

CA 2650947

The invention relates to a process for the demulsifying cleaning of metallic surfaces which may be contaminated with oil(s), with at least one further nonpolar organic compound, with fat(s), with soap(s), with particulate dirt and/or with at least one anionic organic compound using an aqueous, alkaline, surfactant-containing bath solution, with the bath becoming contaminated with oil(s), with at least one further nonpolar organic compound, with fat(s), with soap(s), with particulate dirt and/or with at least one anionic organic compound during cleaning of the metallic surfaces, which is characterized in that the bath contains at least one demulsifying surfactant or/and the latter is added to the bath, in that the bath additionally contains at least one cationic organic compound or/and the latter is added to the bath and in that the bath is maintained in a demulsifying state even in the case of increasing contamination, in particular with at least one anionic organic compound.

L'invention concerne un procédé de nettoyage désémulsifiant de surfaces métalliques le cas échéant contaminées par une ou plusieurs huiles, par au moins un autre composé organique apolaire, par une ou plusieurs matières grasses, par un ou plusieurs savons, par des salissures particulaires ou/et par au moins un composé organique anionique, au moyen d'une solution de bain aqueuse alcaline contenant des agents tensio-actifs, le bain étant contaminé lors du nettoyage par au moins un autre composé organique apolaire, par une ou plusieurs matières grasses, par un ou plusieurs savons, par des salissures particulaires ou/et par au moins un composé organique anionique, caractérisé en ce que le bain contient au moins un agent tensio-actif désémulsifiant ou/et cet agent est ajouté au bain, en ce que le bain contient en outre au moins un composé cationique ou/et ce composé est ajouté au bain, et en ce que le bain est maintenu dans un état désémulsifiant avec au moins un composé organique anionique, y compris lorsque son degré de contamination augmente.

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