Betzdearborn, Inc.

Betz Laboratories, Inc.

Stephen M Kessler

Donald T Freese

Roger C May

Fu Chen

Bruce K Fillipo

Gregory J Pomrink

Kristin E Buentello

Natalie A Kolson

Julie A Kaechelin

Matthew M Hunter

Method for controlling scale formation and deposition in aqueous systems

A method of stabilizing aqueous system solubility of a transition metal salt, polymeric agent corrosion/deposition control combination at neutral pH is disclosed. The addition of an aliphatic hydroxycarboxylic acid to such corrosion/deposition control combinations was found to enhance corrosion/deposition inhibition while providing for a stabile combination at neutral pH.

Method and composition for corrosion and deposition inhibition in

A method and composition for simultaneously controlling the deposition of scale and the formation of corrosion in a cooling water system comprising adding to the system a combination of (a) a water soluble copolymer having the structure: ##STR1## wherein R.sub.1 is H or lower (C.sub.1 -C.sub.4) alkyl, F is H.sub.2 or O, M is a water soluble cation, R.sub.2 is (CH.sub.2 --CH.sub.2 --O).sub.n, ##STR2## or mixture of both, n is an integer of from 1 to about 40, R.sub.3 is H, lower (C.sub.1 -C.sub.4) alkyl or an acetate, and (b) a water soluble polymer characterized by the structural formula: ##STR3## wherein R.sub.1 is H or lower alkyl (C.sub.1 -C.sub.3); R.sub.2 is OH, OM, or NH.sub.2 ; M is a water soluble cation; R.sub.3 is a hydroxy substituted alkyl or alkylene radical having from 1 to 6 carbon atoms or a non-substituted alkyl or alkylene radical having from 1 to about 6 carbon atoms; X is an anionic radical; Z is H or hydrogens or a water soluble cation or cations which together counterbalance the valence of X, and a is 0 or 1.

Method and composition for inhibiting scale and controlling corrosion in

Method for inhibiting scale and controlling corrosion in cooling water

A method and composition for controlling corrosion of metals in contact with an aqueous system is disclosed, which method includes introducing into the aqueous system a sufficient amount of a substantially zinc-free treatment comprising a phosphate compound, and glucoheptonic acid or a water soluble salt thereof.

Inhibition of corrosion in aqueous systems

A low phosphorus process for controlling corrosion in aqueous systems by adding to the aqueous system an effective amount of a composition comprising orthophosphate, azole, polyepoxysuccinic acid and the copolymer of acrylic acid and allyl hydroxypropyl sulfonate ether.

Method of inhibiting corrosion in aqueous systems

A process for stabilizing manganese ions in aqueous solutions is disclosed. The process comprises adding to an aqueous solution containing manganese ions a polymer or copolymer of unsaturated carboxylic compounds such as acrylic acid, methacrylic acid, polyacrylic acid and maleic anhydride and an orthophosphate. The ratio of polymer to orthophosphate is preferably about 2 to 1.

Method of stabilizing mangnaese in aqueous systems

A composition and method for inhibiting corrosion on metallic surfaces which either have been immersed in and removed from an aqueous medium or are partially immersed in a static aqueous medium. The invention comprises adding to an aqueous medium a composition comprising ammonium lignosulfonate, NO.sub.2, B.sub.4 O.sub.7 and SiO.sub.2.

Composition for the control of corrosion on iron surfaces in water

A process for stabilizing manganese ions in aqueous solutions is disclosed. The process comprises adding to an aqueous solution containing maganese ions a polymer or copolymer of unsaturated carboxylic compounds such as acrylic acid, methacrylic acid, polyacrylic acid and maleic anhydride and an orthophosphate. The ratio of polymer to orthophosphate is preferrably about 2 to 1.

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Fairless Hills, PA, United States of America

Stephen M Kessler