Cleaning and corrosion inhibition system and composition for surfaces of aluminum or colored metals and alloys thereof under alkaline conditions

US8071523B2 · kind B2 · utility

Assignee

• Diversey, Inc. · US

Inventors

• Harry Kany · Hettenleidelheim, DE
• Holger Theyssen · Freinsheim, DE

Key dates

• Filing date: Feb 15, 2005
• Grant date: Dec 6, 2011
• Expiry date: May 25, 2027

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C23G1/22
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The present invention relates to corrosion inhibitor systems, in particular to cleaning and corrosion inhibiting compositions for surfaces of aluminum or colored metals and alloys thereof under alkaline conditions, especially in the food and pharmaceutical industries. The cleaning and corrosion inhibiting compositions comprise as a corrosion inhibitor at least one alkyleneoxy alkylphosphate di- or triester having the general formula (I) where Z is either —O-M or —O-(AO)n2— Alkyl wherein M is an ammonium, alkali metal or alkaline earth metal cation, Alkyl is a C5-C22 alkyl or alkylaryl group, AO is a C2-4-alkylene oxide unit and n1, n2 and n3 each are integers from 2 to 10.