Cooling water treatment and compositions useful therein

Claim 1

A TREATED INDUSTRIAL COOLING WATER WHICH COMPRISES A MAJOR PORTION OF AN INDUSTRIAL COOLING WATER HAVING A TENDENCY TO CORRODE AND FOUL METAL SURFACES IN CONTACT THEREWITH, AND A MINOR PORTION OF A COMPOSITION PRESENT IN AN AMOUNT SUFFICIENT TO INHIBIT SAID TENDENCY, SAID COMPOSITION CONSISTING ESSENTIALLY OF 10-90% BY WEIGHT OF A WATER-SOLUBLE CHROMATE COMPOUND SELECTED FROM THE GROUP CONSISTING OF CHROMATE AND DICHROMATE SALTS 5-40% BY WEIGHT OF WATER-DISPERSIBLE NATURAL TANNIN HAVING BEEN MODIFIED BY REACTION WITH A MATERIAL SELECTED FROM THE GROUP CONSISTING OF AN ALKALI METAL SULFITE, AN ALKALI METAL BISULIFTE, AMMONIUM B''SULFITE, AMMONIUM SULFITE, AN ALKALI METAL HALOACETATE, AN ALKALI METAL HALOPROPIONATE, AN ALKALI METAL HALOBUTYRATE, AMMONIUM CYANIDE, AN ALKALI METAL CYANIDE, AMMONIUM THIOCYANATE, AN ALKALI METAL THIOCYANATE, NITRIC ACID AND SULFURIC ACID, AND 10-70% BY WEIGHT OF A WATER-SOLUBLE SULFONATE COMPOUND SELECTED FROM THE GROUP CONSISTING OF LIGNOSULFONATES AND NAPHTHALENE SULFONATE.