| 摘要 |
The invention relates to a method for protecting metal surfaces against corrosion in liquid or gaseous media. The invention is characterized in that compounds of formula (I) are added to the media, wherein in said formula(I), radicals R<sp>1</sp>, R<sp>2</sp> and R<sp>3</sp>, independent of one another, represent an alkyl or hydroxyalkyl radical with 1 to 4 C atoms, an aryl or alkylaryl radical or a radical of formula (II); A- is an anion; n is 2 or 3; p represents a number from 1 to 3; R<sp>5</sp> represents an alkyl or alkenyl radical with 7 to 23 C atoms; 0, 1, 2 or 3 represent a double bond; R<sp>4</sp> represents a radical or formula (II) or formula (III), wherein R<sp>1</sp>, R<sp>2</sp> and R<sp>3</sp> have the meaning cited above; Z represents a group -(CH<sb>2</sb>)<sb>m</sb>- or a group of formula (IV) and m represents a whole number between 1 and 6; X represents an NH group or oxygen; D represents a dimer fatty acid radical with an average of 36 to 54 C atoms, wherein an ethoxylated phosphoric acid ester is also used in conjunction with the compounds of formula (I).
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