Browse Prior Art Database

PHOSPHATE CLEANING FOR ALUMINUM

IP.com Disclosure Number: IPCOM000022879D
Original Publication Date: 1976-Mar-31
Included in the Prior Art Database: 2004-Mar-27
Document File: 2 page(s) / 183K

Publishing Venue

Xerox Disclosure Journal

Abstract

A number of metal cleaners are known for cleaning and processing aluminum and aluminum alloys, Such materials are based primarily on sodium hydroxide, sodium carbonate and/or sodium bicarbonate. Such cleaners, however1 suffer from the disadvantage of being sensitive to a lower pH resulting in a short lived cleaning bath. Maintenance of a higher pH~ on the other hand, sometimes results in an undesirable strong etching effect. These problems can be avoided by utilizing a metal cleaning bath containing about 0.5% 15% by weight of at least one component providing carbonate ions; about 0.5% 15% by weight of at least one polyphosphate component; and up to about 1% and preferably 0.1% 1% by weight of at least one surfactant, the balance comprising water (preferably deionized) or an alcohol solution, including a straight or branched lower alkanol of l~8carbon atoms exemplified by aqueous methanol, ethanol, isopropanol or octanol solutions~

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Page 1 of 2

XEROX DISCLOSURE JOURNAL

PHOSPHATE CLEANING FOR Proposed Classification
ALUMINUM U.S.. Cl.. 252/156
D.J. Angelini Int, Cl.. Cud 7/06

A number of metal cleaners are known for cleaning and
processing aluminum and aluminum alloys, Such materials
are based primarily on sodium hydroxide, sodium carbonate
and/or sodium bicarbonate. Such cleaners, however

                                       1 suffer
from the disadvantage of being sensitive to a lower pH
resulting in a short lived cleaning bath. Maintenance of
a higher pH~ on the other hand, sometimes results in an
undesirable strong etching effect. These problems can be
avoided by utilizing a metal cleaning bath containing about
0.5% 15% by weight of at least one component providing
carbonate ions; about 0.5% 15% by weight of at least one
polyphosphate component; and up to about 1% and preferably
0.1% 1% by weight of at least one surfactant, the balance
comprising water (preferably deionized) or an alcohol
solution, including a straight or branched lower alkanol of
l~8carbon atoms exemplified by aqueous methanol, ethanol,
isopropanol or octanol solutions~

Volume 1 Number 3 March 1976 69

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70 XEROX DISCLOSURE JOURNAL

Volume 1 Number 3 March 1976

[This page contains 1 picture or other non-text object]