Process of cleaning metal surfaces

Details Process of cleaning metal surfaces Process of cleaning metal surfaces

C - Chemistry, Metallurgy

23

G

C23G 1/14 (2006.01) C23G 1/24 (2006.01) C23G 1/36 (2006.01)

Patent

CA 2079628

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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