C - Chemistry – Metallurgy – 23 – F
Patent
C - Chemistry, Metallurgy
23
F
31/59
C23F 11/173 (2006.01) C23F 11/08 (2006.01)
Patent
CA 1330390
ABSTRACT A method for inhibiting corrosion in industrial cooling waters which contain hardness and a pH of at least 6.5, by dosing the water with a composition which comprises a water-soluble inorganic phosphate capable of inhibiting corrosion in an aqueous alkaline environment and a hydrocarbon polymer containing an N-substituted acrylamide polymers with an amide structure as follows: Image where R1 is a hydrogen or an alkyl, R2 is hydrogen or methyl, and R is alkylene or phenylene, and X is sulfonate, (poly)hydroxyl, (poly)carboxyl or carbonyl, and combinations thereof; or con- taining derivatized maleic anhydride homo-, co- and terpolymers having N-substituted maleamic acid units, N-substituted male- imide units and maleic acid (and salts) units having a structure as follows: Image where R1, R2 and R3 are each independently chosen from the group consisting of hydrogen, hydroxyl, carboxyalkyl, carboxyamide, phenyl, substituted phenyl, linear or branched alkyl of from one to ten carbon atoms, and substituted alkyl of from one to ten carbon atoms, where the substituent is phosphonic acid; phos- phinic acid; phosphate ester; sulfonic acid; sulfate ester, carboxyamide, (poly)carboxy and (poly)hydroxy, alkoxy and car- boxylate ester groups; and combinations thereof; and M+ may be H+, alkali metal ions, alkaline earth metal ions, ammonium ions and wherein: n = total moles of derivatized and underivatized maleic units in the polymer and is an integer in the range from 10 to about 1200; x = mole fraction of maleamic acid (salt) units in the polymer and can vary from 0 to about 1.0; y = mole fraction of maleimide units in the polymer and can vary from 0 to about 0.95; z = mole fraction of maleic acid (salts) units in the polymer and can vary from 0 to about 0.95; and wherein: x + y + z = 1.
536674
Fong Dodd W.
Hoots John E.
Johnson Donald A.
Kneller James F.
Nalco Chemical Company
Smart & Biggar
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