Papers by Keyword: Fe Impurity

Abstract: A significant number of different metals are present in aluminum alloy scrap and waste. Secondary aluminum cast alloys, made by recycling from scrap and waste, have as the main impurity Fe. Fe reduction is a very economically and technologically expensive process and therefore there is a growing interest in researching such materials. Moreover, the higher content of Fe leads to the formation of brittle Fe-rich phases, leading to faster propagation of fracture in castings. Therefore, this study reflected on secondary aluminum cast alloy with a higher concentration of Fe and research their effect on brittle Fe-rich phase formation (in the needle; plate-like form) and propagation of fracture in the castings. This study confirms the increasing amount of needle Fe-rich phases in the melt with higher content of Fe. The increasing amount of such phases leads to the formation of a large number of cleavage fractures on fracture surfaces. Although the cleavage fracture increased, the experimental results show low changes in the properties of all experimental melts.

Abstract: The effects of Fe content on the corrosion behavior of Al-Zn-In-Mg-Ti-Si sacrificial anode were investigated by the microstructure observation and electrochemical measurements in order to improve the dissolution feature and electrochemical properties. The results show that the current efficiency of Al-5Zn-0.02In-1Mg-0.05Ti-0.12Si-0.1Fe (wt.%) alloy corroded uniformly reaches 93 % in seawater. It presents the property of lower resistance and higher capacitance. While the Fe content exceeds 0.1 wt.%, the resistance of active dissolution increases gradually. The current efficiency falls down obviously. The results indicate that the electrochemical properties and dissolution feature can be improved significantly by suppressing Fe content under 0.1 wt.% in Al-Zn-In-Mg-Ti-Si alloy.