Mechanism Study and Parameter Optimization of A356 Aluminum AlloyElectrochemical Polishing

The aim of the present study was to find a good method for electropolishing A356 Aluminum alloy. Consideration of the fundamental current density-voltage relation and limiting current density has made it possible to identify an optimum applied voltage for good electropolishing through variation of different parameters (electrolyte, bath temperature, electrode distance, surface roughness before polishing, cathode material, etc.). A mixture of water, perchloric acid and ethanol with different ratio were used as the electropolishing solutions. The electropolished surfaces have been investigated by various electrochemical and morphological techniques, including scanning electron microscope (SEM), atomic force microscope (AFM), roughness measurement and potentiostatic polarization test. The significant findings of the presentstudy are that electropolishing can also improve the corrosion resistance as well as the smoothness.

کلیدواژه ها:

electropolishing ، Smoothness ، corrosion resistance