Corrosion behaviour of a wrought Ti-6Al-3Nb-2Zr-1Mo alloy in artificial seawater with various fluoride concentrations and pH values

•The F− and pH dependent corrosion behaviour of Ti80 alloy in seawater is studied.•The F− has few effects on cathodic reaction but vital effects on anodic process.•The pH plays a significant role in determining the cathodic and anodic processes.•The special cathodic and anodic parameters of Ti80 alloy are determined.•The intergranular β phase shows higher Volta potential than the equiaxed α phase.