Abstract: A method and composition for controlling corrosion of metals, particularly ferrous-based metals in contact with aqueous systems is disclosed, which includes treating industrial waters with a combination of a tetrazolium salt of the general formula: where R1, R2 and R3 may be various organic or inorganic substitutents, where n may be 1 or 2, and at least one other aqueous system treatment material.

Abstract: A method and compounds for inhibiting and controlling corrosion is disclosed. The method is particularly effective at inhibiting or preventing corrosion of ferrous-based metals in contact with aqueous systems such as cooling water systems. The method comprises introducing into the aqueous system a compound of the general formula: ##STR1## wherein R is hydrogen, alkyl, aryl, substituted alkyl or substituted aryl; R' and R" are each independently hydrogen, C.sub.1-4 alkyl or C.sub.1-4 substituted alkyl; Z is O, S, NH, or NR, where R is as described above; n is a positive integer greater than 1; f is a positive integer; and M is hydrogen, a water soluble cation (e.g., NH.sub.4.sup.+, alkali metal), or a C.sub.1 -C.sub.3 alkyl group.

Abstract: The present invention provides for methods and compositions for inhibiting the corrosion of iron-containing metals in contact with aqueous systems. The present invention further provides for compositions and methods for inhibiting pitting of iron-containing metals in contact with aqueous systems. The methods include the use of a copolymer of acrylic or methacrylic acid and 2-acetoacetoxyethylmethacrylate with or without a polyvalent metal salt or a polyhydroxy-polycarboxylic acid.