Composition and method for removing iron containing deposits from equipment constructed of dissimilar metals
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United States of America Patent
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May 14, 1991
Issued Date -
N/A
app pub date -
Jul 24, 1990
filing date -
Aug 22, 1989
priority date (Note) -
Expired
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Abstract
A composition and method for removing iron containing deposits from a metal surface are provided. The metal surface is contacted with an aqueous cleaning composition comprising an acid selected from the group consisting of polycarboxylic acids and polyphosphonic acids, and at least one base selected from the group consisting of alkali metal hydroxides, alkali metal carbonates and alkali metal phosphates. The aqueous cleaning composition can be used to passivate the metal surface after iron containing deposits are removed therefrom. The composition and method are very suitable for removing iron containing deposits from metal surfaces of equipment constructed of dissimilar metals without adversely affecting the metals.
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