Electrochemical behaviour of the β-phase intermetallic (Mg2Al3) as a function of pH as relevant to corrosion of aluminium–magnesium alloys

The intermetallic phase Mg2Al3 was synthesised in bulk form to permit electrochemical characterisation. Polarisation testing was performed in 0.01 M NaCl across the pH range of 2–10, which is relevant to instances where the Mg2Al3 phase populates Al-alloys (i.e. 5xxx series). Mg2Al3 is capable of sustaining high dissolution rates, but this is pH dependent. As such, the range of currents sustained over the E-pH space are reported and are of general use for reconciling localised corrosion or corrosion model feedstock in other works.

► Electrochemical characteristics reported for Mg2Al3 over a wide pH range. ► Addressees the role of Mg2Al3 in corrosion of Al-Mg alloys. ► Anodic current density of Mg2Al3 reported as function of potential and pH.