PROCESS FOR THE APPLICATION OF PHOSPHATE COATINGS ON STEEL,IRON AND ZINC SURFACES
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Abstract
AN IMPROVEMENT IN THE PROCESS FOR THE APPLICATION OF PHOSPHATE COATINGS ON STEEL, IRON AND ZINC SURFACES COMPRISING CONTACTING STEEL, IRON AND ZINC SURFACES WITH AN ACIDIC SOLUTION CONTAINING LAYER-FORMING CATIONS, PHOSPHATE IONS, FLUORIDE IONS OXIDIZING AGENTS FOR A TIME SUFFICIENT TO EFFECT PHOSPHATIZING AND RECOVERING SAID PHOSPHATIZED SURFACES. THE IMPROVEMENT RESIDES IN UTILIZING FROM 59 TO 100 MOL PERCENT OF NICKEL CATIONS AS SAID LAYERFORMING CATIONS IN COMBINATIONS WITH FROM 0 TO 41 MOL PERCENT OF OTHER KNOWN DIVALENT LAYER-FORMING CATIONS. THE INVENTION ALSO RESIDES IN THE ACIDIC PHOPHATIZING SOLUTIONS.
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