Method of controlling an aluminum surface cleaning composition

Details Method of controlling an aluminum surface cleaning composition Method of controlling an aluminum surface cleaning composition

1986-04-03

1989-07-25

Lieberman, Paul

Compositions

Compositions containing a single chemical reactant or plural...

Organic reactant

252 742, 252146, 252147, 134 3, 134 10, 134 18, 134 41, 148 23, 148 24, 156665, C11D 708

Patent

active

048511480

ABSTRACT:
In chromium-free aqueous acidic washing solutions for cleaning the surfaces of aluminum and aluminum-alloy particles, so as to remove therefrom smut and lubricating oil left on the surfaces thereof after metal forming operations, which solutions contain from 0.2 to 4 g/l ferric ion and sufficient sulfuric and/or nitric acid to impart a pH of 2 or less to the solutionh (and which optionally may also contain fluoride ions up to a concentration of 0.5 g/l) there is provided a method of controlling the effectiveness of the washing solution in which the ferric ion concentration therein is monitored, conveniently by the oxidation-reduction potential of the washing solution, as shown in FIG. 3, and is controlled within the desired limits by adding when appropriate suitable amounts of oxidant capable of oxidizing ferrous ions to ferric ions and, separately or in conjunction therewith, a replenisher containing a source of iron ions.

REFERENCES:
patent: 3728188 (1973-04-01), Yarrington
patent: 3993575 (1976-11-01), Howanitz et al.
patent: 4435223 (1984-03-01), Dollman
USSN 06/793,019, Yamasoe et al.

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