Nitrogen-free corrosion inhibitors having a good buffering effect

US5795372A · kind A · utility

Assignee

• Henkel Kommanditgesellschaft auf Aktien · DE

Inventors

• Karlheinz Hill · Erkrath, DE
• Sigrid Igelmund · Goldkronach, DE
• Bernd Stedry · Kempen, DE
• Juergen Geke · Goldkronach, DE
• Andreas Wilde · Karlstad, SE
• Harald Kuester · Goldkronach, DE

Key dates

• Filing date: Jun 16, 1997
• Grant date: Aug 18, 1998
• Expiry date: Jun 16, 2017

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C23F11/12
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

Nitrogen-free aqueous anticorrosion composition containing a) a carboxylic acid having 6 to 44 carbon atoms; and b) aromatic hydroxy compounds having a pK.sub.a value in the range of 7.0 to 11 for the hydroxy group, in a weight ratio of 1:2 to 20:1, in the form of a concentrate to be diluted with water by a factor of between 20 and 200 and in the form of a ready-to-use aqueous preparation that preferably contains 0.2 to 2 wt % component a) and 0.1 to 0.6 wt % component b) and has a pH value in the range of 7 to 11.