Compositions – Preservative agents – Anti-corrosion
Patent
1998-08-17
2000-05-09
Brouillette, Gabrielle
Compositions
Preservative agents
Anti-corrosion
252387, 422 7, 422 13, 106 1405, 106 1411, 106 1421, 106 1423, 106 1426, 106 1433, 106 1438, 106 1443, C09K 300, C23F 1100, C23F 1106, C04B 902
Patent
active
060599960
ABSTRACT:
The invention relates to low-viscosity, aqueous coolant brines based on inhibited alkali metal acetates and/or formates having improved corrosion protection, wherein the coolant brines contain 0.2 to 5% by weight of alkali metal sulfites or pyrosulfites, in particular 1 to 2.5% by weight of these sulfites. The brines according to the invention furthermore contain 0.3 to 5% by weight of basic substances from the alkali metal carbonates, hydroxides, borates and phosphates group and also 0 to 0.3% by weight of alkali metal silicates and 0.02 to 0.2% by weight of stabilizers from the triazoles, benzimidazoles and/or mercaptothiazoles group. The novel coolant brines result in very low corrosion rates, in particular with steel and cast iron.
REFERENCES:
patent: 3948792 (1976-04-01), Watsen et al.
patent: 3962109 (1976-06-01), Oberhofer et al.
patent: 5071582 (1991-12-01), Conville et al.
patent: 5811026 (1998-09-01), Phillips et al.
XP002086519, Section Ch, Week 9412 -Derwent Publications Ltd. London, GB; Class E19, AN 94-098047 & JP 06049442 A (CCI KK), Feb. 22, 1994.
Minks Peter
Schuster Johann
Brouillette Gabrielle
Clariant GmbH
Cole Monique T.
Hanf Scott E.
Pfeiffer Hesna J.
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