초록 ▼

This invention is directed to a corrosion inhibiting composition and to a process for inhibiting corrosion and the deposition of mineral scale on metal in aqueous systems which comprises adding to the water effective amounts of citric acid and/or the alkali metal salts thereof or combinations of a m

This invention is directed to a corrosion inhibiting composition and to a process for inhibiting corrosion and the deposition of mineral scale on metal in aqueous systems which comprises adding to the water effective amounts of citric acid and/or the alkali metal salts thereof or combinations of a metal molybdate with citric acid and/or an alkali metal salt thereof and at least one amino methylene phosphonic acid or a derivative thereof.

대표청구항 ▼

A composition for inhibiting mineral scale and corrosion of metal in the presence of water which comprises, parts based on a million parts by weight of water, from about: (a) 0 to 50 parts by weight of an azole, (b) up to 100 parts by weight of citric acid or its alkali metal salts, (c) 0 to 100 par

A composition for inhibiting mineral scale and corrosion of metal in the presence of water which comprises, parts based on a million parts by weight of water, from about: (a) 0 to 50 parts by weight of an azole, (b) up to 100 parts by weight of citric acid or its alkali metal salts, (c) 0 to 100 parts by weight of a metal molybdate; wherein either the citric acid, alkali metal salt of citric acid or combinations thereof alone or with the molybdate is present in an amount of at least about 3.0 parts per million, and (d) a corrosion inhibiting amount of at least one amino methylene phosphonic acid and the derivatives thereof having the formula: [Figure] wherein R1 is a monovalent radical selected from the class consisting of the formulae: [Figure] (i) [Figure] (ii) [Figure] (iii) wherein R is [Figure] and y has a value of 1 to 8, x has a value of 1 to 4, and M is a radical selected from the class consisting of hydrogen, an alkali or alkaline earth metal, ammonium, an amino radical and an alkyl or substituted alkyl radical having 1 to 4 carbon atoms.