"Corrosion resistant Zn-Al hypoeutectic alloys"
Funding: CAPES Foundation, Brazil
Project period: 2015 – 2016
Principal Investigator: Dr. Srdjan Milenkovic (srdjan.milenkovic(AT)imdea.org)
Zn-Al alloys are widely applied in different engineering applications where the superior wear and corrosion resistance are required. Cu and Mg are often added to further improve their properties. Although Cu has an important influence on the properties of Zn-Al alloys, the presence of the metastable phase epsilon (CuZn4, intermetallic compound) may cause dimensional instability of the alloy over time due to its transformation into the stable pi phase. The formation of metastable phase CuZn4 and the associated phase transformations by heat treatments have been studied for eutectic and hypereutectic Zn-Al, alloys, but there is little information reported in the literature on these changes for Zn-Al hypoeutectics alloys.
The main objective of CRISTAL project, funded by the CAPES Foundation, is to improve corrosion resistance of commercial Zamac 8 alloy (Zn-4Al-2,6Cu-0,5Mg) by microstructure control which will be achieved by varying the Cu content, the solidification rate, heat treatments and the combination of thereof.