High lead solder corrosion inhibitors
AssigneeBASF Wyandotte Corporation
InventorsJoe C. Wilson, Stanley T. Hirozawa
Life of this patent
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Abstract
Compositions and method of using said compositions for inhibiting mineral scale and the corrosion of high lead solder and the cavitation-erosion corrosion of aluminum in aqueous systems are disclosed. Unexpectedly, a mixture of a siloxane-silicate copolymer with an azole is effective in reducing the corrosion of high lead solder and aluminum, particularly the cavitation-erosion corrosion of aluminum in contact with aqueous liquids, such as aqueous alcohol solutions used as heat transfer media. Antifreeze concentrates and a process for inhibiting corrosion are also disclosed.
Claims17
A composition for inhibiting mineral scale and the corrosion of metals in the presence of an aqueous liquid and particularly the corrosion of high lead solder and the cavitation-erosion corrosion of aluminum, comprising:
- A. an effective metal corrosion inhibiting amount of a siloxane-silicate copolymer containing about 0.1 to about 99.9 parts by weight, per 100 parts by weight of said copolymer, of (a) at least one siloxane group represented by the formula:
- RSiO.sub.1.5
- wherein R is selected from the group consisting of a monovalent aliphatic hydrocarbon having 1 to about 18 carbon atoms, a phenyl group, and a vinyl group and 0.1 to 99.9 parts by weight, per 100 parts by weight of said copolymer, of (b) at least one silicate group represented by the formula:
- ##EQU2## wherein M is a cation which forms a water-soluble silicate, d is the valence of the cation represented by M and has a value of at least 1 and e has a value of 1 to 3 and
- B. an effective metal corrosion inhibiting amount of an azole.
Dependencies are inferred from the claim text.