Asymmetrical diesters of ortho-phosphoric acid useful as corrosion inhibitors

US4465516A · kind A · utility

Assignee

• Sandoz AG · CH

Inventors

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

Key dates

• Filing date: Mar 10, 1983
• Grant date: Aug 14, 1984
• Expiry date: Mar 10, 2003

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C02F5/14
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

Asymmetrical phosphate esters of formula I ##STR1## in which R is C.sub.1-20 alkyl, PA1 R.sub.1 is C.sub.1-20 alkyl, PA1 R.sub.2 is hydrogen or methyl PA1 x is 1-15 PA1 and 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.