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Intercrystalline corrosion-resistant aluminium alloy strip, and method for the production thereof

a technology of intercrystalline corrosion and aluminium alloy, which is applied in the field of aluminum alloy strips, can solve the problems that normal aluminium alloy strips can become susceptible to intercrystalline corrosion, and aluminium strips are therefore unsuitable for use in heat-stressed areas, and achieve the effects of reducing the risk of intercrystalline corrosion

Active Publication Date: 2016-09-22
HYDRO ALUMINIUM ROLLED PROD GMBH
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  • Abstract
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Benefits of technology

The patent text describes an aluminium alloy that has good strength and resistance to corrosion. This is achieved by controlling the copper content and restricting the magnesium range. The method also results in a controlled grain size, which improves process stability. The alloy can be cold-rolled and soft-annealed to achieve better formability and lower thicknesses. The technical effects of the patent text are improved strength and corrosion resistance in an aluminium alloy with good process stability.

Problems solved by technology

This concerns in particular the components of a motor vehicle which normally undergo cathode dip painting (CDP) and are then dried in a stoving process, as already due to this stoving process, normal aluminium alloy strips can become susceptible to intercrystalline corrosion.
Such materials and aluminium strips are therefore unsuitable for use in heat-stressed areas.

Method used

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  • Intercrystalline corrosion-resistant aluminium alloy strip, and method for the production thereof
  • Intercrystalline corrosion-resistant aluminium alloy strip, and method for the production thereof
  • Intercrystalline corrosion-resistant aluminium alloy strip, and method for the production thereof

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Embodiment Construction

[0053]Extensive trials were carried out to investigate if there is a link between the grain size of an aluminium alloy strip in an AA 5xxx-type aluminium alloy and the Mg content in terms of the resistance to intercrystalline corrosion. To this end, various aluminium alloys were used and different process parameters applied. Table 1 shows the various alloy compositions, on the basis of which the relationship between grain size, resistance to intercrystalline corrosion and yield point was investigated. Apart from the contents of the alloying elements Si, Fe, Cu, Mn, Mg, Cr, Zn and Ti in wt. %, the aluminium alloys shown Table 1 comprise as remainder aluminium and inevitable impurities, each of which amounts to a maximum of 0.05 wt. % and the total amount of which amounts to no a maximum of 0.15 wt. %.

[0054]Since, in particular, the final annealing and the final degree of rolling have an influence on the grain size, these were varied and / or measured during the respective trials. The g...

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Abstract

The invention relates to an aluminium alloy strip composed of an AA 5xxx-type aluminium alloy containing at least 4 wt. % of Mg in addition to Al and inevitable impurities. The object of the invention of proposing an aluminium alloy strip in an AlMg aluminium alloy strip which is resistant to intercrystalline corrosion despite having high strength and an Mg content of at least 4 wt. %, is achieved according to a first teaching of the present invention by an aluminium alloy strip that has a recrystallized microstructure, the grain size (GS) of which in μm has the following relation to the Mg content (c_Mg) in wt. %:GS≧22+2*c_Mg, and wherein the aluminium alloy of the aluminium alloy strip has the composition described herein.

Description

CROSS-REFERENCE TO RELATED PATENT APPLICATIONS[0001]This patent application is a continuation of PCT / EP2013 / 067484, filed Aug. 22, 2013, which claims priority to European Application No. 12 181 356.2, filed Aug. 22, 2012, the entire teachings and disclosures of which are incorporated herein by reference thereto.FIELD OF THE INVENTION[0002]The invention relates to an aluminium alloy strip composed of an AA 5xxx-type aluminium alloy, which apart from Al and unavoidable impurities has an Mg content of at least 4 wt. %. The invention also relates to a method for the production of the aluminium alloy strip according to the invention and a component produced from an aluminium alloy strip according to the invention.BACKGROUND OF THE INVENTION[0003]Aluminium-magnesium-(AlMg-)-alloys of the AA 5xxx-type are used in the form of sheets or plates or strips for the construction of welded or joined structures in ship, automotive and aircraft construction. They are in particular characterised by h...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C22F1/047C22C21/08
CPCC22C21/08C22F1/047C22C21/06
Inventor HENTSCHEL, THOMASENGLER, OLAFBRINKMAN, HENK-JAN
Owner HYDRO ALUMINIUM ROLLED PROD GMBH
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