Anticorrosives

US4000079A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Christian Rasp · Cologne, DE
• Artur Botta · Krefeld, DE

Key dates

• Filing date: Jun 27, 1973
• Grant date: Dec 28, 1976
• Expiry date: Jun 27, 1993

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K5/20
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

Corrosion-inhibiting aqueous solutions and corrosion inhibiting antifreeze agents based on glycols and aqueous solutions thereof are prepared by adding two such solutions and agents already containing conventional corrosion inhibitors, heterocyclic nitrogen compounds having the formula: ##STR1## wherein: R.sup.1 and R.sup.2 are hydrogen or together with the carbon atoms to which they are attached represent an optionally substituted benzene ring; PA1 R.sup.3, r.sup.4, r.sup.5 and R.sup.6 independently of one another are selected from the group of hydrogen, lower alkyl, phenyl substituted by one or more lower alkyls; PA1 X is sulphur or an imino group (NH) optionally substituted on the nitrogen atom; and PA1 n is an integer from 1 to 13, added to an aqueous solution or antifreeze agent which contains at least one conventional corrosion inhibitor.