PROCESS OF CLEANING METAL SURFACES

In a process of cleaning metal surfaces with aqueous alkaline cleaning solutions, which contain sili- cates and surfactants and are recycled after ultrafil- tration, a solution is employed which contains silicate only as a sodium silicate and/or potassium silicate of the general formula Na2 0.2SiO2....

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Bibliographische Detailangaben
Hauptverfasser:	WITTEL, KLAUS, BLUEMLHUBER, GEORG
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	CHEMICAL SURFACE TREATMENT CHEMISTRY CLEANING OR DEGREASING OF METALLIC MATERIAL BY CHEMICALMETHODS OTHER THAN ELECTROLYSIS COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL DIFFUSION TREATMENT OF METALLIC MATERIAL INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL METALLURGY
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Beschreibung
Zusammenfassung:	In a process of cleaning metal surfaces with aqueous alkaline cleaning solutions, which contain sili- cates and surfactants and are recycled after ultrafil- tration, a solution is employed which contains silicate only as a sodium silicate and/or potassium silicate of the general formula Na2 0.2SiO2.xH2O and/or K2 0.2SiO2.xH2O. The cleaning solution is preferably adjusted to a pH value between 7 and 12 and to a concentration (ex- pressed as SiO2) of 0.1 to 20, particularly 0.5 to 10 g, silicate per liter.