Dendritic structure formation of magnesium alloys for the manipulation of corrosion properties: Part 2 – corrosion

Author:

Łakoma Piotr1,Ditze André2,Scharf Christiane3

Affiliation:

1. aClausthal University of Technology, Institute of Metallurgy, Clausthal–Zellerfeld, Germany

2. bEngineering Office MetuRec, Clausthal–Zellerfeld, Germany

3. cHelmholtz Centre Dresden Rossendorf, Helmholtz Institute Freiberg for Resource Technology, Freiberg, Germany

Abstract

AbstractIn pure magnesium and aluminum-containing magnesium alloys, the microstructure also plays a role in the corrosion properties. In Part 1, the grain sizes, secondary dendrite arm spacings (SDAS) and precipitates of β phase were determined by casting samples with 0, 3, 6, 9 and 12 % aluminum (all compositions in mass percentage) at different cooling rates. These samples were tested for corrosion properties by immersion and salt spray tests. The modeling of the corrosion process enables establishing a mathematical link between the microstructure and corrosion properties of an alloy. The results show an increase in the corrosion rate with increasing aluminum contents and the cooling rate. The precipitations at the grain boundaries have a relevant impact on corrosion properties of the magnesium–aluminum alloys. A random comparison using the salt spray test tends to confirm the results.

Publisher

Walter de Gruyter GmbH

Subject

Materials Chemistry,Metals and Alloys,Physical and Theoretical Chemistry,Condensed Matter Physics

Reference57 articles.

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