C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
134/36
C02F 5/10 (2006.01) C02F 5/12 (2006.01) C23F 11/08 (2006.01)
Patent
CA 1187765
Abstract of The Disclosure A method for inhibiting corrosion and controlling deposi- tion in an iron containing aqueous medium is disclosed. the method is capable of providing for the formation of a protective passive oxide film on the metallic surfaces in contact with the aqueous medium without resulting in unacceptable iron based deposition or fouling. Surprisingly, the method does not call for the addition of an organic-phosphonic acid compound or derivative to the aqueous medium as would be normally expected due to the known iron disper- sing characteristics of these type compounds. The invention com prises maintaining the pH level at 5.5 or above, assuring that a certain minimal calcium or other ion level is maintained, and adding to the system an orthophosphate compound and a water soluble acrylic acid/hydroxyalkylacrylate copolymer.
413146
May Roger C.
Sessa Frank C.
Betzdearborn Inc.
Borden Ladner Gervais Llp
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