Helmholtz-Zentrum Geesthacht Zentrum Fur Material Und Kustenforschung Gmbh

Helmholtz-Zentrum Geestachts Zentrum Fuer Material—und Kuestenforschung Gmbh

Daniel Höche

Sviatlana Lamaka

Mikhail Zheludkevich

Karl Ulrich Kainer

Yuanding Huang

Jun Liang

Carsten Blawert

Michael Störmer

Mikhail L Zheludkevich

Wolfgang Dietzel

The present invention relates to electrolyte additives for magnesium air batteries, which are compatible with rechargeable magnesium batteries and carry the promise of overcoming the hurdles, especially enhancing the overall performance of magnesium air batteries comprising an aqueous electrolyte. The electrolyte additive for a magnesium battery comprising a chelating agent which is capable of forming a complex with at least one of Fe(II), and Fe(III) ions, where the complex with at least one of Fe(II) and Fe(III) ions has a stability constant in aqueous solution at room temperature (about 25&#xb0; C.) log K of greater than or equal to 6.0 and which is also capable of forming a complex with Mg(II) ions where the complex with Mg(II) ions has a stability constant in aqueous solution at room temperature (about 25&#xb0; C.) log K of greater than or equal to 4.0.

Electrolyte additives for magnesium air batteries

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&#xb0; 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.

Corrosion inhibitor composition for magnesium or magnesium alloys

The present invention relates to a process for producing a coating on the surface of a substrate by plasma-electrolytic oxidation. Improved corrosion protection for lightweight metals, in particular for magnesium or magnesium alloys, is achieved by the process. Furthermore, biocompatible protective layers can also be produced on these materials, with the option of controlling degradation of the substrate. The layers are amorphous. They are produced by plasma-electrolytic oxidation in which the substrate is dipped as electrode together with a counterelectrode into an electrolyte liquid and a sufficient electric potential for generating spark discharges at the surface of the substrate is applied, wherein the electrolyte comprises clay particles dispersed therein. Substrates can therefore be any machine components, automobile components, railroad components, aircraft components, ships' components, etc., or bioimplants such as bone replacement materials or medical bone screws made of a lightweight metal such as magnesium or a magnesium alloy.

Process for producing a coating on the surface of a substrate based on lightweight metals by plasma-electrolytic oxidation

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Hamburg, Germany

Daniel Höche