Alkaline cleaning process

Details Alkaline cleaning process Alkaline cleaning process

1984-11-08

1986-07-08

Hruskoci, Peter

Cleaning and liquid contact with solids

Processes

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

134 3, 134 27, 134 29, 134 40, 252156, 427327, 427444, C23G 114

Patent

active

045991162

ABSTRACT:
An aqueous alkaline cleaning composition and process for cleaning aluminum container surfaces in a manner to inhibit objectionable white-etch staining during prolonged cleaning cycles and brown oxide discoloration during prolonged rinse cycles in which the cleaning solution contains an alkalinity agent or agents present in an amount sufficient to remove aluminum fines from the surfaces thereof, a complexing agent present in an amount to complex at least some of the metal ions in the cleaning solution which tend to form insoluble precipitates and at least one surfactant present in an amount sufficient to remove organic soils from the surfaces being cleaned and to suppress the formation of white-etch staining of the surfaces during prolonged cleaning cycles. The surfactant or blend of surfactants employed are further characterized by at least one having a Hydrophile-Lipophile Balance (HLB ratio) of at least about 12. The aqueous cleaning composition can optionally further contain an antifoaming agent to suppress objectionable foaming.

REFERENCES:
patent: 3653095 (1972-04-01), Dupre et al.
patent: 4048121 (1977-09-01), Chang
patent: 4091954 (1978-05-01), Wallace
patent: 4116849 (1978-09-01), Leikhim
patent: 4124407 (1978-11-01), Binns
patent: 4317685 (1982-03-01), Ahuja
patent: 4349448 (1982-09-01), Steele
patent: 4457322 (1984-07-01), Rubin et al.
patent: 4477290 (1984-10-01), Carroll et al.
R. Pinner, Electroplating and Metal Finishing Jul. 1967, pp. 208 et seq.

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