Claims
- 1. A method of inhibiting metallic corrosion and inhibiting deposition of calciferous scale in cooling water systems, which method consists of injecting chemicals into cooling water containing bicarbonate ion and containing from about 10 to 600 ppm of cations of the group consisting of calcium and magnesium, said injection providing in said cooling water injection chemicals consisting essentially of the following components:
- ______________________________________ concentration range - ppm______________________________________polyacrylic acid, MW. 1,000 0.3-3.0tartaric acid 0.1-1.0sodium sulfonate dispersant 0.1-2.0mixture of plurality of disphosphonates,triphosphonates, tetraphosphonates andpolyphosphonates 0.1-1.0phosphate ester dispersant 0.5-3inorganic phosphate 3-40aromatic triazole 0.1-10______________________________________
- said inhibited cooling water havin a pH within the range from 6.5 to 8.2, said corrosion inhibition being attributable to the propensity for said treated cooling waters to form protective layers on metals contacted by said cooling waters, said protective layer comprising a dynamic equilibria mixture of several of said components, the inorganic phosphate being the component present in the greatest concentration, and said scale inhibition being attributable to control of pH, control of dispersant effectiveness, and control of relationships amongst bicarbonate, phosphate, and calcium ions, whereby any propensities for formation of insoluble calcium salts are regulated to be in the dispersed phase instead of forming calciferous scale.
- 2. The method of claim 1 in which the aromatic triazole is tolyl trizole.
- 3. The method of claim 1 in which the mixture of plurality of disphosphonates, triphosphonates, tetraphosphonates and polyphosphonates comprises the sodium salt of amino tris (methylene phosphonic acid) and the sodium salt of a tetraphosphonic acid in weight ratio of about 2 to 1.
RELATED APPLICATION
This is a parent of a divisional application Ser. No. 317,965 filed Nov. 4, 1981, concerned with composition claims,
US Referenced Citations (21)
Foreign Referenced Citations (1)
Number |
Date |
Country |
2513735 |
Oct 1975 |
DEX |
Divisions (1)
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Number |
Date |
Country |
Parent |
317965 |
Nov 1981 |
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