MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
Influence of Silicon on Intergranular Corrosion for Aluminum Alloys
Yoshiyuki OyaYoichi KojimaNobuyoshi Hara
Author information
JOURNALS FREE ACCESS

2013 Volume 54 Issue 7 Pages 1200-1208

Details
Abstract

In an effort to improve the tensile strength of aluminum–silicon (Al–Si) alloys used in heat exchangers, we investigated the influence of Si concentration and heat-treatment at 453 K on the susceptibility of Al–Si alloys to intergranular corrosion. It was found that the susceptibility to intergranular corrosion increased with an increase in Si concentration. It also initially increased with heat-treatment at 453 K, but then decreased with long-term heat-treatment at 453 K. The addition of Mg and Mn, which affect the precipitation of Si, promoted precipitation and reduced the susceptibility of the Al–Si alloys to intergranular corrosion. With longer heat-treatment at 453 K, large Si precipitates were observed in the grains and at the grain boundaries, which reduced the susceptibility to intergranular corrosion. Short-term heat-treatment at 453 K formed a continuous Si-depleted layer along the grain boundaries, which increased the susceptibility to intergranular corrosion. It is suggested that the susceptibility to intergranular corrosion was dependent on the addition of Mg and Mn.

Information related to the author
© 2013 The Japan Institute of Metals and Materials
Previous article Next article
feedback
Top