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Corrosion inhibitor composition for magnesium or magnesium alloys

a technology of corrosion inhibitors and compositions, which is applied in the direction of electrolytic coatings, surface reaction electrolytic coatings, anodisation, etc., can solve the problems of reducing affecting the corrosion resistance of magnesium alloys, so as to inhibit the corrosion of such metals and lessen the environmental concern

Inactive Publication Date: 2018-11-08
HELMHOLTZ ZENT GEESTHACHT ZENT FUER MATERIAL UND KUESTENFORSCHUNG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides new corrosion inhibitor compositions for magnesium or magnesium alloys that are more effective and environmentally friendly than existing compositions. The compositions prevent corrosion by reducing the re-deposition of noble impurities, such as iron, copper, and nickel, which are often found on the surface of magnesium. These impurities enhance the corrosion process, so by chemically binding them with carboxylic acids or hydroxy carboxylic acids, the compositions prevent re-deposition and decrease the corrosion rate. The corrosion inhibiting compounds also form stable complexes with the metal ions, further increasing the stability of the complex. The process of inhibiting corrosion includes pre-treating the magnesium or magnesium alloy with the corrosion inhibitor composition to dissolve metal impurities from its surface. Overall, the present invention provides more effective and environmentally friendly corrosion inhibitor compositions for magnesium and magnesium alloys.

Problems solved by technology

However, the percentage of magnesium alloys used in automobiles, electric products, aircraft components, etc. has been traditionally low.
Furthermore, the chromate treatment has the drawback that when conducted, the treatment discolors the surface of the metal, depriving the metal of its luster.
Furthermore, chromium compounds are rather toxic and harmful to the environment.

Method used

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  • Corrosion inhibitor composition for magnesium or magnesium alloys
  • Corrosion inhibitor composition for magnesium or magnesium alloys

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Embodiment Construction

[0019]Preferred embodiments of the present invention are further illustrated by the following, non-limiting examples by referring to the figures below. Magnesium materials used for hydrogen evolution measurements presented in FIGS. 1 to 8 were as specified in Table 1. The ingots of HP Mg 51, WE43, ZE41, E21, AZ31, AZ91 and AM50 were shaved to receive the stripes with the surface area of 240 to 480 cm2 / g. This was done to ensure the identical chemical composition of each portion of the alloy used for testing solutions of different inhibitors. The plates (5.0 cm2 / g) of commercial purity magnesium (CP Mg 220) were tested.

TABLE 1Noble impurities found* in the materials used for hydrogenevolution tests.Impurity, ppmMaterialFeCuNiHigh Purity Mg (HP Mg5151)Commercial Purity Mg2205(CP Mg 220)WE43384746ZE4115198Elektron 21 (E21)122052AZ3115143AZ912248AM508133*Analysed by spark emission spectroscopy

[0020]FIG. 1 shows the results (normalized values) of hydrogen evolution measurements during im...

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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 comprises a compound comprising a carboxyl group preventing the re-deposition of noble impurities which significantly decreases the corrosion rate by complexing said noble impurities, e.g. iron, nickel and copper.

Description

FIELD OF THE INVENTION[0001]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.BACKGROUND OF THE INVENTION[0002]Magnesium is most lightweight of all structural metals, weighing 35 percent less than aluminum and 78 percent less than steel. Lightweight characteristics, wide availability and processability make magnesium alloys suitable for production of motor vehicle components, electric products, aircraft components, etc. Generally, magnesium and magnesium alloys are made into shaped articles mainly by die casting, extrusion or rolling. However, the percentage of magnesium alloys used in automobiles, electric products, aircraft components, etc. has been traditionally low. The reasons for the limited use of magnesium alloys are associated with the intrinsic properties of this family of alloys: low creep and corrosion resistance.[0003]The corrosion...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C23F11/12C23C22/83C23C22/57
CPCC23F11/124C23C22/83C23C22/57C23F11/12C23C22/68C09D5/086C25D11/026C25D11/30C23C22/78
Inventor LAMAKA, SVIATLANAHOCHE, DANIELBLAWERT, CARSTENZHELUDKEVICH, MIKHAIL L.
Owner HELMHOLTZ ZENT GEESTHACHT ZENT FUER MATERIAL UND KUESTENFORSCHUNG
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