Corrosion behaviour of AA2014 aluminium alloy-cenospheres syntactic foam in 3.5% NaCl solution

Abstract

Corrosion behaviour of as-cast cenospheres reinforced AA2014 Al-alloy syntactic foam has been compared with that of as-cast virgin alloy (AA2014 Al-alloy) in 3.5% NaCl solution. The corrosion studies of these materials through electrochemical measurements indicate that the syntactic foam exhibits less corrosion rate when it contains up to 40 vol% of cenospheres. It is observed that the corrosion rate is further reduced with increase in cenosphere size from 75 µm to 125 µm. A detail corrosion mechanism has been presented schematically and discussed in the light of cenosphere size and volume fraction in the syntactic foam.