公开(公告)号：EP0946788B1

公开(公告)日：2001-07-25

申请号：EP97951917.0

申请日：1997-11-19

申请人： Cognis Deutschland GmbH

发明人： BREUER, Wolfgang ,  SCHÜTZ, Robert ,  UPHUES, Günther ,  HEROLD, Claus-Peter ,  PI, Rafael

IPC分类号： C23F11/14 ,  E21B41/02

CPC分类号： C23F11/141 ,  C09K8/54 ,  C23F11/142 ,  C23F11/145

摘要： Disclosed is a method for protecting metal surfaces against corrosion in liquid, aqueous, non-aqueous or gaseous media, characterized in that compounds of formula (I) are added to the media, whereby in formula (I) the radicals R , R and R mean individually an alkyl or hydroxy alkyl radical with 1 to 4 C atoms, an alkyl or alkyl aryl radical or a radical of formula (II), in which n stands for 2 or 3, p is 1 to 3 and R means an alkyl or alkenyl radical with 7 to 23 C atoms and 0, 1, 2 or 3 double bonds, A represents an anion, and R means a radical of formula (II) or formula (III), wherein R , R and R have the above-cited meaning and Z stands for a group (CH2)m- or a group of formula (IV) where m represents a whole number between one and 6, X is a group NH or oxygen and D means a dimer fatty acid radical with in average 36 to 54 C atoms.