| abstract |
Mechanical working of aluminium and aluminium alloys is carried out in the presence of a water-based cooling lubricant, which has the form of a stable solution and contains as lubricating and corrosion inhibiting agents a combination of (a) a carboxyl compound having a hydrophobic group of 7-22 carbon atoms, (b) a tertiary alkylalkanol amine having a molecular weight of less than 300 and (c) a water soluble organic solubiliser having a molecular weight of less than 400 and a maximum hydrocarbon group of 6 carbon atoms. The amounts of the carboxyl compound and the tertiary alkylalkanol amine are chosen so that a base/acid equivalent ratio between the alkanol amine and the carboxyl compound is less than 1.0, preferably less than 0.9. A concentrate, which after dilution with water, may be used as a cooling lubricant is also disclosed. |