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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Hauptverfasser: WITTEL, KLAUS, BLUEMLHUBER, GEORG
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BLUEMLHUBER, GEORG
description 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.
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subjects 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
title PROCESS OF CLEANING METAL SURFACES
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