Silicate-, borate- and phosphate-free cooling fluids based on glycols with improved corrosion behavior

摘要

The invention relates to a coolant concentrate consisting of DOLLAR A a) 0.1 to 6 wt .-% of at least one mono- and / or dicarboxylic acid having 4 to 16 carbon atoms in the form of alkali metal salts, DOLLAR A b) 0.02 to 2% by weight of a triazine triiminocarboxylic acid in the form of its alkali metal salt, DOLLAR A c) 0.02 to 2% by weight of at least one hydrocarbon triazole, DOLLAR A d) 0.01 to 1% by weight of at least one soluble alkaline earth salt, DOLLAR A e) optionally up to 4 wt .-% water and DOLLAR A f) glycols ad 100 wt .-%, DOLLAR A each based on the total weight of the concentrate.