STABLE COMPOSITIONS FOR USE AS CORROSION INHIBITORS AND METHOD OF CORROSION INHIBITION IN AQUEOUS MEDIA

摘要

A composition is disclosed comprising a stable aqueous solution of (i) water-soluble zinc compound and (ii) a particular type of water-soluble polymer composed essentially of moieties derived from acrylic acid and hydroxylated lower alkyl acrylates. The composition could additionally comprise (iii) orthophosphate. There is also disclosed a method for reducing corrosion of metal surfaces in contact with an aqueous medium prone to zinc precipitation which comprises adding to said aqueous medium an inhibitor comprising water-soluble zinc compound and copolymer of acrylic acid and hydroxylated lower alkyl acrylate. Water-soluble orthophosphate can also be used. There is also disclosed a method of inhibiting the formation of zinc scale forming conditions in which copolymer of acrylic acid and hydroxylated lower alkyl acrylate is used as inhibitor.