W. R. Grace Co.-conn.

W. R. Grace Co.

Chemed Corporation

Dearborn Chemical Company Ltd.

Vincent R Kuhn

Robert P Kreh

Charles G Carter

John A Kelly

Joseph T Lundquist

Robert M Spotnitz

Jose T Jacob

Wayne A Mitchell

Vladimir Jovancicevic

Wayne L Henry

John Richardson

Philip R Engelhardt

A method of inhibiting corrosion of a metal surface in an aqueous system having a pH of at least 6, comprising maintaining in the aqueous system, in an amount effective to inhibit corrosion, a water-soluble, organic-rare earth metal chelate which is derived from a rare earth metal having an atomic number from 57 to 71 and an organic chelant. The organic chelant provides not only water solubility but surprisingly enhanced corrosion inhibiting activity. The water-soluble, organic-rare earth chelates may be advantageously combined with other corrosion inhibitors such as zinc chelates, organophosphonates, phosphates, chromates, molybdates, and the like.

Corrosion inhibition with water-soluble rare earth chelates

A method of removing iron contaminants in an aqueous system by introducing and maintaining within the system at least one ortho dihydroxyaromatic compound having at least one electron withdrawing group pendant from the aromatic ring and, further, a method of inhibiting calcium scale formation in the presence of iron contaminants by utilizing at least one dehydroxyaromatic compound in combination with calcium scale inhibitors.

Corrosion control

Removing iron fouling from heat transfer surfaces of cooling water systems with an aqueous solution of certain alkylene amine carboxyl polyacids, or water soluble salts thereof, at a pH of 5-9.

Removal of iron fouling in cooling water systems

Method of inhibiting corrosion of iron base metals

Composition for prevention of ferrous corrosion consisting essentially of (a) sorbitol, (b) benzotriazole or tolyltriazole, and (c) a water-soluble phosphate.

Anti-corrosion composition

Growing community of inventors

Twin Lakes, WI, United States of America

Vincent R Kuhn