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This work focused on the role of Al2O3 particles in the corrosion behavior of cold sprayed AA5083 alu-minum alloy matrix composite (Al-MMC) coatings.The electrochemical characterization of the coatings was investigated in a 3.5 wt.％ NaCl solution as a function of time.The results show that fragmentation of Al2O3 particles is not clearly observed in the case of AA5083/20 vol.％ Al2O3 coating,while the bro-ken Al2O3 particles can be seen clearly in AA5083/40 vol.％ Al2O3 and AA5083/60 vol.％ Al2O3 coatings.The addition of 20 vol.％ Al2O3 particles yield the coating with the lowest porosity,and different volume fractions of Al2O3 in the feedstock have important effects on the electrochemical behavior of composite coatings.The Al-MMC coating reinforced with 20 vol.％ Al2O3 particles exhibits the highest Ecorr and the lowest icorr compared with the other conditions.The order of current density is as follows:AA5083/20 vol.％ Al2O3 ＜ AA5083 ＜ AA5083/40 vol.％ Al2O3 ＜ AA5083/60 vol.％ Al2O3.