Corrosion inhibitor composition

Claim 2

A corrosion inhibitor composition for water systems consisting essentially of: a. a water-soluble phenolic resin prepared by reacting a phenol having the ortho and/or para position blocked and of the general structural formula ##STR3## wherein n is 1-3 and each X is in the ortho or para position and is independently selected from the group consisting of --OH, --COOH, hydrogen, --SO 3 H, --NH 2 and alkyl and alkylene radicals which have up to 8 carbon atoms and an aldehyde of the formula ##STR4## wherein R is selected from the group consisting of hydrogen and lower aliphatic groups having less than 5 carbon atoms; and b. a polyphosphate selected from the group consisting of inorganic polyphosphates having a molar ratio of at least one of alkali metal oxide, alkaline earth metal oxide, zinc oxide to P 2 O 5 of about 0.4/1-2/1, and their corresponding acids having a molar ratio of water to P 2 O 5 of about 0.4/1-2/1 and polyfunctional acid phosphate esters of a polyhydric alcohol, said esters having the formula R--(OPO 3 H 2 ) x wherein R is the organic residue of a polyhydric alcohol and x is a number from 2 to 6.

Claim 3

A composition of claim 1 wherein (a) is a water-soluble phenolic resin prepared by reacting salicylic acid with formaldehyde.

Claim 4

A composition of claim 1 wherein (a) is a water-soluble phenolic resin prepared by reacting resorcinol with formaldehyde.

Claim 5

A composition of claim 1 wherein (b) is a glassy linear sodium polyphosphate.

Claim 6

A composition of claim 1 wherein the polyphosphate is a polyfunctional acid phosphate ester of pentaerythritol.

Claim 7

Method of conditioning circulating water to reduce the corrosive attack on metal surfaces which the water contacts which comprises introducing into said circulating water a composition consisting essentially of: a. a water-soluble phenolic resin prepared by reacting a phenol having the ortho and/or para position blocked and of the general structural formula ##STR5## wherein n is 1-3 and each X is in the ortho or para position and is independently selected from the group consisting of --OH, --COOH, hydrogen, --SO 3 H, --NH 2 and alkyl and alkylene radicals which have up to 8 carbon atoms and an aldehyde of the formula ##STR6## wherein R is selected from the group consisting of hydrogen and lower aliphatic groups having less than 5 carbon atoms; and b. a polyphosphate selected from the group consisting of inorganic polyphosphates having a molar ratio of at least one of alkali metal oxide, alkaline earth metal oxide, zinc oxide to P 2 O 5 of about 0.4/1-2/1, and their corresponding acids having a molar ratio of water to P 2 O 5 of about 0.4/1-2/1, and polyfunctional acid phosphate esters of a polyhydric alcohol, said esters having the formula R--(OPO 3 H 2 ) x wherein R is the organic residue of a polyhydric alcohol and x is a number from 2 to 6.

Claim 8

Method of conditioning circulating water to reduce the corrosive attack on metal surfaces which the water contacts which comprises introducing into said circulating water a composition consisting essentially of: a. a water-soluble phenolic resin prepared by reacting a phenol having the ortho and/or para position blocked and of the general structural formula ##STR5## wherein n is 1-3 and each X is in the ortho or para position and is independently selected from the group consisting of --OH, --COOH, hydrogen, --SO 3 H, --NH 2 and alkyl and alkylene radicals which have up to 8 carbon atoms and an aldehyde of the formula ##STR6## wherein R is selected from the group consisting of hydrogen and lower aliphatic groups having less than 5 carbon atoms; and b. a polyphosphate selected from the group consisting of inorganic polyphosphates having a molar ratio of at least one of alkali metal oxide, alkaline earth metal oxide, zinc oxide to P 2 O 5 of about 0.4/1-2/1, and their corresponding acids having a molar ratio of water to P 2 O 5 of about 0.4/1-2/1, and polyfunctional acid phosphate esters of a polyhydric alcohol, said esters having the formula R--(OPO 3 H 2 ) x wherein R is the organic residue of a polyhydric alcohol and x is a number from 2 to 6.

Claim 9

A method of claim 6 wherein (a) is a water-soluble phenolic resin prepared by reacting salicylic acid with formaldehyde.

Claim 10

A method of claim 6 wherein (a) is a water-soluble phenolic resin prepared by reacting resorcinol with formaldehyde.

Claim 11

A method of claim 6 wherein (b) is a glassy linear sodium polyphosphate.

Claim 12

A method of claim 6 wherein (b) is phosphorylated pentaerythritol.

Claim 13

A method of claim 6 wherein the ratio of (a) to (b) is from about 5 to 1 to about 1 to 5.

Claim 14

A method of claim 6 wherein the ratio of (a) to (b) is from about 3 to 1 to about 1 to 3.

Claim 15

A method of claim 6 wherein the amount of said composition introduced into said water is about 5 to about 100 ppm.

Claim 16

A method of claim 6 wherein the amount of said composition introduced into said water is about 10 to about 20 ppm.