Title: Cooling water corrosion inhibition method
Application Number: 87103379 Application Date: 1987.05.08
Publication Number: 1015290 Publication Date: 1987.12.16
Approval Pub. Date: 1997.04.23 Granted Pub. Date: 1997.04.23
International Classifi-cation: C23F11/167;C23F11/173;C23F11/18
Applicant(s) Name: Nalco Chemical Co. (US) One Nalco Center, Napervil Address:
Inventor(s) Name: Donald A. Johnson; Dodd W. Fong;James W. Kneller;J
Attorney & Agent: QUAN JING WU DAJIAN
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; or containing derivatized maleic anhydride homo-, co- and terpolymers having N-substituted maleamic acid units, N-substituted maleimide units and maleic acid (and salts) units having a structure as follows.
Time: 10
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