Method of cleaning a metal surface
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United States of America Patent
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Feb 19, 2002
Grant Date -
N/A
app pub date -
Aug 2, 2000
filing date -
Aug 2, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Methods and compositions for controlling corrosion of high strength steels in the presence of a cleaning solution for removing iron oxide scale from metal surfaces. A benzotriazole or benzimidazole compound is added to a combination of ethoxylated mercaptan and/or oxidized ethoxylated mercaptan and 1-hydroxyethylidene-1,1-diphosphonic acid. The composition is added to an aqueous system, such as a steam generating system, to remove scale from the metal surfaces.
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