The thesis studied the electrochemical property on the high entropy alloys AlCrFeMnNi, and we synthetized three kinds of the high entropy alloys (AlxMoyCr12Fe35Mn28Ni20，x+y=5) when we added Mo. In the study，we used sulfuric acid，sodium chloride and sodium sulfate；In addition, the polarization curves of these three alloys in sulfuric acid solutions or sodium chloride solutions with different concentrations were also tested for measuring their corrosion potentials and corrosion currents. In addition, we could observe the electrochemical properties of (AlxMoyCr12Fe35Mn28Ni20， x+y=5，) in the room temperature with changing [Cl-] in different concentrations mixed solutions of sulfuric acid/ sodium chloride or sodium chloride/ sodium sulfate.
Al1Mo4Cr12Fe35Mn28Ni20 is better than another of three in sulfuric acid solution with the same concentration；the three high entropy alloys’ electrochemical properties are near in the high sodium chloride solutions, but in the low sodium chloride solutions Al1Mo4Cr12Fe35Mn28Ni20 and Al3Mo2Cr12Fe35Mn28Ni20 are better especially Al1Mo4Cr12Fe35Mn28Ni20 ,it proved that adding Mo has better corrosion resistance. But three of AlxMoyCr12Fe35Mn28Ni20 were not good in corrosion resistance.
In mixed solutions studying ,we could know [Cl-] is directly proportional to pitting, and [Cl-] is a important role to pit.
