CORROSION INHIBITING WATER ADDITIVES AND PREPARATION PROCESS THEREOF

摘要

The water additives contain as active substance organic phosphates having the general formula (I) and zinc phosphate. In the general formula (I), R1 is hydrogen or a cyclohexyl group and R2 is a cyclohexyl group, and n has a value comprised between 0.5 and 3. Said water additives are prepared by transformation of 5-85% of phosphoric acid with cyclohexyl amine or dicyclohexyl amine and addition to the mixture before, during or after the transformation of at the most 10% of zinc phosphate with respect to the organic phosphate or of a zinc compound forming zinc phosphate with the phosphoric acid. Said corrosion inhibiting water additive may be used in cold water - and hot water - cooling circuits in order to reduce the corrosion speed.