This research aims to explore the corrosion behavior and electrochemical properties of the high entropy alloy (HEA) AlCrFeMnNi ，to see whether increasing the amount of cold work (0% ，30% and 60%) would increase the pitting corrosion resistance ，and to achieve the critical pitting temperature (CPT) of the alloy in a specific aqueous environment containing chloride (Cl-) or fluoride (F-) through increasing the bath temperature (20-90℃).
Experiments were conducted separately in sulfuric acid sodium chloride，ammonium chloride and sodium fluoride solutions and the result showed that under the room temperature the type 304 stainless steel showing a better pitting corrosion resistance than the HEA ；judging from the anodic polarization curves and SEM observations ，higher degree of cold work of the HEA has a better pitting corrosion resistance.
Exposing AlCrFeMnNi alloy in acidic or in chloride environment showed that the component Al would easily react with the solution and be damaged by pitting corrosion leaving large amount of pits on the surface of the specimen . In dealing with such HEA it is possible to enhance the surface passivity for corrosion protection by means of increasing the degree of cold work .It is also observed that the CPT of this particular alloy increases with the increasing concentration of the fluoride solution and the highest CPT was achieved for the HEA with the highest degree of cold work.
