Claims
- 1. A method for providing corrosion inhibition in aluminum-containing internal combustion engines which utilize a polyhydroxyalcohol-based coolant, comprising adding to said coolant:
- (a) from about 0.07% to about 0.35% nitrate,
- (b) from about 0.04% to about 0.08% silicate,
- (c) from about 0.05% to about 0.25% of a compound selected from a group consisting of tolyltriazole, benzotriazole, and mixtures thereof,
- (d) from about 0.2% to about 1.5% borate, and
- (e) from about 0.2% to about 0.75% phosphate,
- wherein the cations are selected from the group consisting of sodium, potassium, and mixtures thereof and wherein the pH of the composition is from about 9 to about 11.5.
Parent Case Info
This is a division, of application Ser. No. 280,877, filed July 6, 1981 now U.S. Pat. No. 4,382,870.
US Referenced Citations (11)
Non-Patent Literature Citations (2)
Entry |
Wiggle, Hospadaruk and Styloglou, "The Effectiveness of Engine Coolant Inhibitors for Aluminum", NACE, 1980. |
Wiggle and Hospadaruk, "A Rapid Method to Predict the Effectiveness of Inhibited Engine Coolants in Aluminum Heat Exchangers", SAE, 1980. |
Divisions (1)
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Number |
Date |
Country |
Parent |
280877 |
Jul 1981 |
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