Cleaning and liquid contact with solids – Processes – For metallic – siliceous – or calcareous basework – including...
Patent
1988-01-13
1988-12-06
Pal, Asok
Cleaning and liquid contact with solids
Processes
For metallic, siliceous, or calcareous basework, including...
134 10, 134 2214, 134 2216, 134 28, 134 41, 252 81, 252 85, 252 87, 252105, B08B 308, C23G 5032
Patent
active
047894067
ABSTRACT:
Methods for removing iron oxide and other accumulated corrosion products from metal surfaces in contact with aqueous systems, such as cooling water systems, are disclosed. The method steps can be performed without requirement of system shutdown and without requirement of acidic conditions. The methods comprise contacting the corroded surface with an organic reductant/chelant and an inorganic reducing agent while the pH of the aqueous system is maintained within the substantially neutral range of about 6.5-7.5. Pyrogallol and methyl gallate may be used as the organic reductant/chelant.
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Holder E. Paul
Klaessig Frederick C.
Peerce-Landers Pamela J.
Reichgott David W.
Betz Laboratories Inc.
Pal Asok
Ricci Alexander D.
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