Methods and compositions for simultaneously removing iron...

Details Methods and compositions for simultaneously removing iron... Methods and compositions for simultaneously removing iron...

C - Chemistry, Metallurgy

23

F

149/14

C23F 1/28 (2006.01) C23G 1/08 (2006.01)

Patent

CA 1204372

\ Abstract of the Disclosure Methods and compositions for simultaneously removing iron and copper scales from ferrous metal surfaces are provided. The compositions are comprised of water, one or more organic chelating acids which dissolve iron, a reducing agent selected from the group consisting of erythorbic acid, alkali metal salts of erythorbic acid, ammonium salts of erythorbic acid and mixtures thereof and a copper complexing compound selected from the group consisting of thiourea, hexahyrdopyrimidine- 2-thione and mixtures thereof. The compositions are utilized by contacting scale-containing ferrous metal surfaces therewith at temperatures in the range of from about 75°F to about 150°F.

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