Aqueous cleaning composition

Abstract

An aqueous acidic cleaning composition suitable for the cleaning of metal parts is constituted by urea phosphate, a surfactant, a corrosion inhibitor, and water. The corrosion inhibitor can be a phosphatizing compound such as iron phosphate, zinc phosphate, manganese phosphate, and the like.

1 . An acidic aqueous cleaning composition which consists essentially of a urea phosphate salt, a surfactant, a corrosion inhibitor, and water. 
   
   
       2 . The composition in accordance with  claim 1  wherein the corrosion inhibitor is benzotriazole. 
   
   
       3 . The composition in accordance with  claim 1  wherein the corrosion inhibitor is a blend of polyamines and thiourea. 
   
   
       4 . The composition in accordance with  claim 1  wherein the urea phosphate salt is a mixture of urea monophosphate and urea diphosphate. 
   
   
       5 . The composition in accordance with  claim 1  wherein pH value of the composition is no higher than about 5.5. 
   
   
       6 . The composition in accordance with  claim 1  wherein the composition has a pH value no higher than about 2.5. 
   
   
       7 . The composition in accordance with  claim 1  wherein the composition has a pH value of about 2.2. 
   
   
       8 . The composition in accordance with  claim 1  wherein the corrosion inhibitor is a phosphatizer. 
   
   
       9 . The composition in accordance with  claim 1  wherein the corrosion inhibitor includes iron phosphate.