Corrosion-inhibited phosphate solutions and compositions useful for manufacturing them

Claim 1

AN AQUEOUS AMMONIUM PHOSPHATE COMPOSITION CONSISTING ESSENTIALLY OF, IN ADDITION TO AT LAST ONE INORGANIC AMMONIUM ORTHOPHOSPHATE SELECTED FROM THE GROUP CONSISTING OF MONOAMMONIUM ORTHOPHOSPHATE AND DIAMMONIUM ORTHOPHOSPHATE, AN INORTANIC WATER-SOLUBLE THIOCYANATE COMPOUND; THERE BEING DISSOLVED IN SAID COMPOSITIONS FROM ABOUT 0.5 TO ABOUT 25 WEIGHT PERCENT OF SAID INORGANIC AMMONIUM ORTHOPHOSPHATE, AND FROM ABOUT 0.03 TO ABOUT 7.5 WEIGHT PERCENT OF DISSOLVED THIOCYANATE ION.

Claim 3

A METHOD OF RETARDING THE CORROSION OF COPPER AND COPPER ALLOYS UPON CONTACT WITH A NORMALLY CORROSIVE AQUEOUS AMMONIUM ORTHOPHOSPHATE SOLUTION CONSISTING ESSENTIALLY OF WATER AND, DISSOLVED THEREIN, FROM ABOUT 0.5 TO ABOUT 25 WEIGHT PERCENT OF AMMONIUM ORTHOPHOSPHATE SELECTED FROM THE GROUP CONSISTING OF MONOMMONIUM ORTHOPHOSPHATE, DIAMMONIUM ORTHOPHOSPHATE AND MIXTURES THEREOF, WHICH METHOD COMPRISES EFFECTING SAID CONTACT WHEN SAID AQUEOUS AMMONIUM ORTHOPHOSPHATE SOLUTION CONTAINS DISSOLVED THEREON FROM ABOUT 0.075 TO ABOUT 7.5 WEIGHT PERCENT OF THIOCYANATE IONS.

Claim 4

A METHOD OF RETARDING THE CORROSION OF COPPER AND COPPER ALLOYS UPON CONTACT WITH A NORMALLY CORROSIVE AQUEOUS AMMONIUM ORTHOPHOSPHATE SOLUTION CONSISTING ESSENTIALLY OF WATER AND, DISSOLVED THEREIN, FROM ABOUT 0.5 TO ABOUT 25 WEIGHT PERCENT OF AMMONIUM ORTHOPHOSPHATE SELECTED FROM THE GROUP CONSISTING OF MONOMMONIUM ORTHOPHOSPHATE, DIAMMONIUM ORTHOPHOSPHATE AND MIXTURES THEREOF, WHICH METHOD COMPRISES EFFECTING SAID CONTACT WHEN SAID AQUEOUS AMMONIUM ORTHOPHOSPHATE SOLUTION CONTAINS DISSOLVED THEREON FROM ABOUT 0.075 TO ABOUT 7.5 WEIGHT PERCENT OF THIOCYANATE IONS.