Properties of Al-Sn-Bi-Mn Sacrificial Anode Used for Freshwater

The effects of Sn content and heat treatment on microstructure and electrochemical properties of Al-Sn-Bi-Mn alloys had been studied by means of scanning electron microscopy(SEM),energy dispersive spectrometer(EDS),photograph microscopy and electrochemical test.The results showed that the aluminum alloy containing 1.0% Sn had satisfying electrochemical performance in freshwater,and its current efficiency reached 45.17%.After solution treatment at 580 ℃for 10 h and aging treatment at 150 ℃ for 6 h,the current efficiency of the sample increased to 51.33%.The corrosion of the sample surface was uniform and the corrosion products were shed easily.