Patent ID: 6432890
Filing Date: 2002-08-13
Classification: C10M,C10N,C23F

Abstract:
A method for mechanically working a metal containing cobalt or performing metal working with a metal tool containing cobalt, said method comprising the steps of:(1) covering a working surface with an aqueous cooling lubricant, wherein said lubricant having a pH between 6 and 10 and comprising: a) a phosphate ester of the formula â€ƒR1(oxyalkylene)nOP(O)(X)(OH)â€ƒâ€ƒ(I),or(HO)2(O)P-(oxyalkylene)m-OP(O)(OH)2â€ƒâ€ƒ(II), wherein R1 is an alkyl group with 1-12 carbon atoms, X is hydroxyl or the group R1O, where R1 has the above mentioned meaning, oxyalkylene is a group containing 2-4 carbon atoms, n is a number from 1-15 and m is a number from 4-20, or a salt thereof; b) a carboxylic acid of the formula R2(COOH)pâ€ƒâ€ƒ(III), wherein R2 is an alkyl group with 6-12 carbon atoms and p is 1 or 2, or a salt thereof; and c) an alkanol amine of the formula N(R3)(R4)(R5)â€ƒâ€ƒ(IV), wherein R3, R4 and R5 independently of each other designate a group (AO)nH, where AO is an ethyleneoxy group or a propyleneoxy group and n is a number from 2-6, the number of ethyleneoxy groups in relation to the number of propyleneoxy groups is between 2:1 and 1:3, the amount of a) being 5-85% by weight, b) 5-85% by weight and c) 10-90% by weight, calculated on the total weight of a), b) and c); (2) performing the metal working in the presence of said lubricant.