Abstract: Aqueous media having a dissolved content of a small amount, (less than 100 p.p.m.) of a mixture of aminoalkanols of the formula: ##STR1## wherein R.sub.1 and R.sub.2 each represent H and C.sub.1-18 unbranched alkyl substituents (the sum of the carbon atoms in R.sub.1 and R.sub.2 being 9 to 18), R.sub.3 and R.sub.4 each represent H,C.sub.1-4 alkyl and C.sub.2-4 hydroxyalkyl substituents, x represents 2 to 6, and y represents 0 to 1, the ##STR2## units in the aminoalkanols being of at least two different chain lengths in the range of 11 to 20 carbon atoms, possess decreased tendency to corrode iron-containing metals including steel. The mixtures are also useful in salt form. The efficiency of the mixture is improved by various additives which act synergistically therewith.

Abstract: A method for inhibiting corrosion of nonferrous metals in contact with circulating water comprising the steps of adding to circulating water in contact with non-ferrrous metals from 0.05 to 10 gm/m.sup.3 of at least one 3-amino-5-alkyl-1,2,4-triazole wherein said alkyl has from 2 to 8 carbon atoms and adjusting said water to a pH of from 6 to 10; as well as corrosion inhibiting compositions containing said 3-amino-5-alkyl-1,2,4-triazole.

Abstract: A method for inhibiting corrosion of non-noble metals in contact with circulating water comprising the steps of adding to circulating water in contact with non-noble metals from 0.5 to 50 gm/m.sup.3 of at least one cyclohexanehexacarboxylic acid and adjusting said water to a pH of from 6 to 9; as well as corrosion inhibitory compositions containing cyclohexanehexacarboxylic acid.