Corrosion inhibitor composition for magnesium or magnesium alloys

US10590343B2 · kind B2 · utility

Assignee

• Helmholtz-Zentrum Geesthacht Zentrum für Material- und Küstenforschung GmbH

Inventors

• Sviatlana Lamaka · Geesthacht, DE
• Daniel Höche · Hamburg, DE
• Mikhail Zheludkevich · Aveiro, PT

Key dates

• Filing date: Jul 31, 2017
• Grant date: Mar 17, 2020
• Expiry date: Nov 27, 2037

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C23F11/149
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

The present invention relates to novel corrosion inhibitor compositions for magnesium or magnesium alloys and to a process for inhibiting the corrosion of such metals using such compositions. The corrosion inhibitor composition for magnesium or magnesium alloys comprises at least one corrosion inhibiting compound which is capable of forming a complex with at least one of Fe(II), Fe(III), Cu(I), Cu(II) and Ni(II) ions, where the complex with at least one of Fe(II), Fe(III), Cu(I), Cu(II) and Ni(II) ions has a stability constant in aqueous solution at room temperature (about 21° C.) log K of greater than or equal to 3.5 wherein the corrosion inhibiting compound is selected from the group of pyridinedicarboxylic acids, and their salts or esters thereof.