About this Abstract |
Meeting |
MS&T21: Materials Science & Technology
|
Symposium
|
Development of Light Weight Alloys and Composites
|
Presentation Title |
Effect of Copper Contents on Corrosion of High Performance ACMZ Cast Aluminum Alloys |
Author(s) |
Jiheon Jun, Amit Shyam, J. Allen Haynes, Yi Feng Su |
On-Site Speaker (Planned) |
Jiheon Jun |
Abstract Scope |
ACMZ cast Al alloys were developed to realize higher temperature strength and fatigue performance for the fabrication of cylinder heads for higher-efficiency engines. ACMZ alloys contain relatively high Cu contents (6~8 wt.%) which may impact the corrosion behavior of the alloys. This work aims to compare the aqueous corrosion resistance of different classes of ACMZ alloys and two commercial Al cast alloys, A319 and A356 with 0.5 wt.% Cu in as-cast and aged conditions. The evaluation of corrosion resistance was primarily performed in NaCl solutions at ambient temperatures using a suite of electrochemical techniques including corrosion potential, anodic/cathodic polarizations and electrochemical impedance spectroscopy measurements. Corrosion mass change measurement of selected Al alloys was also conducted by NaCl solution immersion tests. The experimental results indicated that the corrosion resistance of as-cast and aged ACMZ alloys was comparable or slightly higher than the resistance of commercial Al alloy counterparts. |