Abstract
The effect of the chemical composition, i.e. content of silicone (Si) and other alloying elements (Zr, Mn, etc) on the corrosion behaviour and mechanical properties of Al-Mg-Si (6xxx) type alloys was investigated in this paper. Open circuit corrosion potential (OCP) measurements, linear polarization and potentiodynamic anodic/cathodic polarization were employed in order to determine the corrosion behaviour of artificially aged Al-Mg-Si samples in the chloride ions containing aqueous corrosion solutions. The difference in OCPs for the tested 6xxx type alloys in relation to the standard AA1020 alloy was observed to be between 1-4%, except for the AlMg0.65Si0.76Zr0.1 alloy when the difference was 14% (about 100 mV). The presence of zirconium and manganese in AlMgSi0.7 base alloy, that contains small excess of Si, shifts the OCPs to more negative values for -15 mV (~2%) and -88 mV (~11%) in natural water and 0,51 mol NaCl, respectively. All the tested 6xxx type alloys, except AlMg0.7Si1.2Mn0.8, show almost the same corrosion rates and other corrosion characteristics in chloride solution, with mass loss per year between 2.3-3 g/m2 .
Highlights
ObjectivesThe aim of the present paper was to investigate the corrosion behaviour and mechanical properties of five AlMgSi0.5, AlMgSi0.7 and AlMgSi1 alloys, in relation with their chemical composition and different content of silicone (Si), and some other alloying elements (Zr, Mn, etc)
The 6xxx series of aluminum alloys are very attractive for the application in transportation industry because of their high specific strength to weight ratio
Chemical compositions of the tested alloys are within the limit prescribed in the standards causing a wide variation of the microstructure, while mechanical properties and corrosion characteristics can be achieved depending on manufacturing process, including both mechanical and heat treatments
Summary
The aim of the present paper was to investigate the corrosion behaviour and mechanical properties of five AlMgSi0.5, AlMgSi0.7 and AlMgSi1 alloys, in relation with their chemical composition and different content of silicone (Si), and some other alloying elements (Zr, Mn, etc)
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