Coolant system cleaning solutions having silicate or siliconate-based corrosion inhibitors
First Claim
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1. A cooling system cleaning solution, comprising, based on the total weight of the solution:
- a. from 1 to about 30 percent of an EDTA salt;
b. from about 1 to about 50 percent of a gluconate salt;
c. from 0.5 to about 8 percent of a soluble nitrate salt;
d. from 0.1 to about 10 percent of a corrosion inhibitor selected from the group consisting of alkali metal silicates, siliconates and silicone-silicate mixtures;
the balance being a water miscible diluent, said solution having a pH in the range of 9 to 11.
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Abstract
Cooling system cleaning solutions containing an EDTA salt, a polyhydroxy mono- or dicarboxylic sugar acid, and a soluble nitrate salt are effective in removing scale, corrosion, and solder bloom from cooling systems.
46 Citations
8 Claims
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1. A cooling system cleaning solution, comprising, based on the total weight of the solution:
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a. from 1 to about 30 percent of an EDTA salt; b. from about 1 to about 50 percent of a gluconate salt; c. from 0.5 to about 8 percent of a soluble nitrate salt; d. from 0.1 to about 10 percent of a corrosion inhibitor selected from the group consisting of alkali metal silicates, siliconates and silicone-silicate mixtures; the balance being a water miscible diluent, said solution having a pH in the range of 9 to 11. - View Dependent Claims (2, 3, 4)
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5. A cooling system cleaning solution, comprising, based on the total weight of the solution:
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a. from 1.0 to about 10.0 percent of tetrasodium EDTA salt; b. from 1.5 to about 30 percent of sodium gluconate; c. from 1.0 to about 5.0 percent of a sodium nitrate; d. from 0.1 to about 10.0 percent of a corrosion inhibitor selected from the group consisting of alkali metal silicates, siliconates and silicone-silicate mixtures; e. from 0.5 to about 8.0 percent of 35 weight percent nitric acid; with the balance of said solution being water or a mixture of water and one or more low molecular weight alcohols or glycols, the pH of said solution being in the range of 9 to 11. - View Dependent Claims (6, 7, 8)
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Specification