Corrosion inhibitor for a closed aqueous cooling system

Compositions – Preservative agents – Anti-corrosion

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25238954, 25238961, 25238962, 252 75, C23F 1108, C09K 500

Patent

active

049618784

ABSTRACT:
A composition for inhibiting metal corrosion in a closed aqueous cooling system comprising an aqueous mixture of (a) a nitrate, (b) a silicate, (c) an acrylate polymer, (d) an amine oxide and (e) tolyltriazole. A preferred embodiment also includes a molybdate.

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patent: 4325829 (1982-03-01), Duggleby et al.
patent: 4359413 (1982-11-01), Ward et al.
patent: 4452715 (1984-06-01), Hirozawa
patent: 4778655 (1988-08-01), Greaves
Evaluation of Molybdate as an Inhibitor in Automotive Engine Coolants, Corrosion/82, (Paper No. 265), 3/82 (Houston, TX).
Drew Principles of Industrial Water Treatment pp. 147-151.
"Automotive Engine Coolant Inhibitors for Aluminum", by R. R. Wiggle, National Assoc. of Corrosion Engrs., June, 1981, pp. 13-18.
"Evaluation of Molybdate as an Inhibitor in Automotive Engine Coolants", by M. S. Vukasovich et al., Aug., 1983, pp. 25-33.
ASTM D-1384, "Standard Method for Corrosion Test for Engine Coolants in Glassware", Bk. of ASTM Standards, Part 30, p. 213 (1976).

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