The Nature of Aluminum Destruction at Neutral Mediums with Different Anion Composition

The comparative data about aluminum anodic behavior in series of electrolytes (рН=5,3-6,3) with different anion composition (Na2SO4, КNO3, NaCl) at room temperature was analyzed. It was established the analogy of aluminum anodic behavior in mediums with SO42- and NO3- -ions additives where metal was in a passive state, but the aggressive action Cl--ions due to local activation of aluminum. The obtained experimental results were interpreted according to modern theories of competitive adsorption and nucleophilic substitution.