Effects of acidity and alkalinity on corrosion behaviour of Al-Zn-Mg based anode alloy

► The corrosion kinetic of the alloy is minimized in slightly neutral solution. ► In acidic or neutral solution, general and pitting corrosion occurred simultaneously. ► In alkaline solution, the alloy mainly suffered general corrosion. ► The alloy undergoes two types of pitting: hemispherical and crystallographic.