Showing papers by "Andrej Atrens published in 2006"
TL;DR: In this article, the results of atmospheric corrosion testing and of an examination of patina samples from Brisbane, Denmark, Sweden, France, USA and Austria were presented, with the aim of determining the structure of natural patinas and to relate their structure to their appearance in service and to the atmospheric corrosion of copper.
153 citations
TL;DR: In this paper, the thickness, chemical composition and microstructure of anodised coatings formed on magnesium alloy AZ91D at various anodising current densities were measured.
146 citations
TL;DR: In this paper, the influence of geometric factors on the galvanic current density distribution for AZ91D coupled to steel was investigated using experimental measurements and a BEM model using geometric factors such as area ratio of anode/cathode, insulation distance between anode and cathode, depth of solution film, and the manner of interaction caused by two independent interacting galvanic couples.
138 citations
TL;DR: In this article, the corrosion performance of anodised magnesium and its alloys, such as commercial purity magnesium (CP-Mg) and high purity magnesium ingots, magnesium alloy ingots of MEZ, ZE41, AM60 and AZ91D, was evaluated by salt spray and salt immersion testing.
110 citations
TL;DR: In this article, the effect of impurity iron and the alloying elements aluminium and zinc in single-phase substrate magnesium alloys on the corrosion resistance of the alloys after anodisation was studied.
Abstract: This work studied the effect of the impurity iron and the alloying elements aluminium and zinc in single-phase substrate magnesium alloys on the corrosion resistance of the alloys after anodisation. It was found that increasing zinc content (0-2%) led to increased corrosion resistance of an anodised single-phase Mg-Zn alloy. The addition of Al lowered the corrosion resistance of an anodised commercial purity Mg-Al single-phase alloy, whereas the same addition was found to be beneficial to the corrosion resistance of an anodised high purity Mg-Al single-phase alloy. Heat-treatment made the substrate Mg-Al and Mg-Zn alloys more uniform and hence improved the corrosion resistance of the alloys after anodisation. The detrimental effect of iron impurity on corrosion performance of the unanodised substrate single-phase magnesium alloys was inherited by the anodised alloys. The corrosion resistance of the anodised Mg alloys was found to be closely correlated with the corrosion performance of the unanodised as-cast Mg alloys. (c) 2005 Elsevier B.V. All rights reserved.
89 citations
TL;DR: In this paper, a new equation for the diffusion coefficient of hydrogen (H) in magnesium (Mg) has been proposed, which indicates that there can be significant H transport ahead of a stress corrosion crack in Mg at ambient temperature and that H may be involved in the mechanism of stress corrosion cracking in mg.
Abstract: Evaluation of recent data for hydrogen (H) diffusion in magnesium (Mg) yielded a new equation for the diffusion coefficient of H in Mg. This indicates that there can be significant H transport ahead of a stress corrosion crack in Mg at ambient temperature and that H may be involved in the mechanism of stress corrosion cracking in Mg.
66 citations
TL;DR: In this article, the atom probe field ion microscope (APFIM) measurement of the carbon concentration at a grain boundary (GB) was related to the microstructure and to IGSCC observations.
31 citations
15 May 2006
5 citations
01 Jan 2006
TL;DR: In this article, a critical review of the stress corrosion cracking (SCC) of magnesium alloys is presented, including practical guidelines for the service use of Mg alloys in the atmosphere and/or in contact with aqueous solutions.
Abstract: Our recent critical review of the stress corrosion cracking (SCC) of magnesium aims to provide a foundation for the safe and effective use of magnesium alloys, including practical guidelines for the service use of Mg alloys in the atmosphere and/or in contact with aqueous solutions. This is to provide support for the rapidly increasing use of Mg in industrial applications, particularly in the automobile industry. These guidelines should be firmly based on a critical analysis of our knowledge of SCC based on (1) service experience, (2) laboratory testing and (3) understanding of the mechanism of SCC, as well as based on an understanding of the Mg corrosion mechanism.