Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7896740 | Corrosion Science | 2013 | 14 Pages |
Abstract
In this study, the microstructure and corrosion behaviour of rheocast and gravity-cast A356 aluminium alloys were examined and compared. Scanning Kelvin probe force microscopy (SKPFM) results proved that large potential differences between iron-containing intermetallics and the α-Al matrix were responsible for the initiation of the attack at the intermetallics/α-Al interfaces. For longer immersion times, corrosion attack proceeded through the eutectic areas. Semisolid processing refined the eutectic silicon and iron-intermetallics and reduced the potential difference between secondary phases and the matrix. This resulted in improved pitting corrosion resistance of the rheocast A356 aluminium alloy.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
R. Arrabal, B. Mingo, A. Pardo, M. Mohedano, E. Matykina, I. RodrÃguez,