Process for cleaning metal surfaces

Details Process for cleaning metal surfaces Process for cleaning metal surfaces

1992-10-02

1994-10-04

Dees, Jose G.

Cleaning and liquid contact with solids

Processes

For metallic, siliceous, or calcareous basework, including...

134 10, 252540, C23G 114

Patent

active

053522966

ABSTRACT:
In a process of cleaning metal surfaces with aqueous alkaline cleaning solutions, which contain silicates and surfactants and are recycled after ultrafiltration, a solution is employed which contains silicate only as a sodium silicate and/or potassium silicate of the formula Na.sub.2 O.2SiO.sub.2.xH.sub.2 O and/or K.sub.2 O.2SiO.sub.2.xH.sub.2 O. The cleaning solution is preferably adjusted to a pH value between 7 and 12 and to a concentration (expressed as SiO.sub.2) of 0.1 to 20, particularly 0.5 to 10 g, silicate per liter.

REFERENCES:
patent: 3870560 (1975-03-01), Shumaker
patent: 4201664 (1980-05-01), Hekal
Metal Surfaces Dec. 6, 1988.

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