The corrosion of two aluminium sacrificial anode alloys in SRB-containing sea mud

•Corrosion rate of Al–Zn–In–Sn was higher than Al–Zn–In–Mg–Ti in SRB sea mud.•Pitting of Al–Zn–In–Sn occurred in sea mud with and without SRB.•More serious corrosion damage occurred in the SRB-containing sea mud.•The growth rates of pits could be further increased in the presence of SRB.•Corrosion rates of anodes increased with SRB because of cathodic depolarisation.