METHOD OF PREVENTING OCCURRENCE OF SPARKLING EFFECT IN MOLTEN ALKALINE METALS SALTS AND/OR TRIETHANOLAMINE SALTS OF ALKANOYLAMIDOCARBOXYLIC ACIDS USED IN A METAL TREATING PROCESS AND COMPOSITIONS PREVENTING OCCURENCE OF SUCH EFFECT IN THAT PROCESS

摘要

PCT No. PCT/EP96/05837 Sec. 371 Date Jul. 5, 1998 Sec. 102(e) Date Jul. 5, 1998 PCT Filed Dec. 24, 1996 PCT Pub. No. WO97/25394 PCT Pub. Date Jul. 17, 1997At least 5, preferably at least 30, in particular about 50, percent by weight of the alkali metal salts and/or triethanolamine salts of alkanoylamidocarboxylic acids of the general formula R1 denotes an alkanoyl or an alkanesulfonyl radical, each having 6 to 20 carbon atoms, R4 denotes a hydrogen atom; m is 2; n is 0 or 1, and z denotes an integer from 0 to 3; are used as antifoams in corrosion-inhibiting metal working compositions.