Corrosion-inhibiting cleaning systems for aluminum surfaces, par

Details Corrosion-inhibiting cleaning systems for aluminum surfaces, par Corrosion-inhibiting cleaning systems for aluminum surfaces, par

1991-10-10

1993-08-03

Pal, Asok

Cleaning and liquid contact with solids

Processes

Using sequentially applied treating agents

134 3, 134 7, 134 42, 252135, 252140, B08B 700, B08B 704

Patent

active

052325148

ABSTRACT:
An alkaline blast cleaning system for aluminum surfaces which avoids discoloring or tarnishing of the aluminum surfaces, is comprised of an alkali metal bicarbonate having a particle size of from about 50 to about 1000 and an aqueous solution of sodium silicate, the sodium silicate having an SiO.sub.2 :Na.sub.2 O ratio of from about 2.44 to about 3.22:1 and being present in the aqueous solution in a corrosion inhibiting concentration of from about 100 to about 1000 ppm., the pH of the solution ranging from about 8.1 to about 8.3.

REFERENCES:
patent: 4020857 (1977-05-01), Rendemonti
patent: 4174571 (1979-11-01), Gallant
patent: 4528039 (1985-07-01), Rubin et al.

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