Base solution for cleaning aluminum
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United States of America Patent
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Nov 5, 1996
Grant Date -
N/A
app pub date -
Sep 29, 1995
filing date -
Sep 29, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A solution and solution concentrate for cleaning metal surfaces, particularly aluminum surfaces in which CaO or Ca (OH).sub.2 is added to sulfuric acid to raise the pH to about 13.1 after which the solution is passed through an eleven micron filter and potassium hydroxide is added to raise the pH to greater than 13.8. The resulting concentrate is diluted with water to an appropriate degree, generally 15 parts concentrate to 85 parts of water such as to bring the pH down to a working range of 8.5 to 11.0, degree of dilution depending on the usage.
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