Flow-induced corrosion consists electrochemical and mechanical components.The present paper has to as- sessed the role of chloride ion and dissolved oxygen in the electrochemical component of flow induced corrosion for AA5083-H321 aluminum-magnesium alloy which is extensively used in the construction of high-speed boats, submarines,hovercrafts,and desalination systems,in NaCI solutions.Electrochemical tests were carried out at flow velocities of 0,2,5,7 and 10 m/s,in aerated and deaerated NaCI solutions with different sodium chloride concentrations.The results showed that the high rate of oxygen reduction under hydrodynamic conditions causes an increase in the density of pits on the surface.The increase of chloride ions concentration under flow conditions accelerates the rate of anodic reactions,but have no influence on the cathodic reactions.Thus,in the current work,it was found that under flow conditions,due to the elimination of corrosion products inside the pits,corrosion resistance of the alloy is increased. Flow-induced corrosion consists of electrochemical and mechanical components. The present paper has to as-sessed the role of chloride ion and dissolved oxygen in the electrochemical component of flow induced corrosion for AA5083-H321 aluminum-magnesium alloy which is extensively used in the construction of high-speed boats, submarines, hovercrafts, and desalination systems, in NaCI solutions. Electrochemical tests were carried out at flow velocities of 0,2,5,7 and 10 m / s, in aerated and deaerated NaCI solutions with different sodium chloride concentrations The results showed that the high rate of oxygen reduction under hydrodynamic conditions causes an increase in the density of pits on the surface. Increase of chloride ions concentration under flow conditions accelerates the rate of anodic reactions, but have no influence on the cathodic reactions .Thus, in the current work, it was found that under flow conditions, due to the elimination of corrosion products inside the pits, corrosion resistanc e of the alloy is increased.