Asymmetrical diesters of orthophosphoric acid useful as corrosion inhibitors

US4389259A · kind A · utility

Assignee

• Sandoz AG · CH

Inventors

• Bernard Danner · Riedisheim, FR
• Hartmut Mau · Istein, DE
• Hans Stettler · Allschwil, CH

Key dates

• Filing date: Apr 24, 1981
• Grant date: Jun 21, 1983
• Expiry date: Apr 24, 2001

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07F9/14
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Asymmetrical phosphate esters of formula I ##STR1## in which R is C.sub.1-20 alkyl, PA0 R.sub.1 is C.sub.1-20 alkyl, PA0 R.sub.2 is hydrogen or methyl PA0 x is 1-15 and PA0 M is hydrogen, an alkali metal ion or an equivalent of an alkali earth metal or zinc ion are effective inhibitors of oxidative corrosion of metals in the presence of electrolytes. They may be used alone or in conjunction with further additives, and are preferably dissolved in the electrolyte with which the metal is to come in contact.