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The electrochemical behavior of niobium in aqueous solutions of pH covering the range 2-12 in naturally aerated solutions was investigated. The general behavior of the niobium electrode is the passivation in all aqueous solution leading to the low corrosion rate . The equilibrium electrode potential is a linear function of the solution pH. The slope of the linear relation nearly -0.04 V/pH . EIS investigations have shown that the metal undergoes active dissolution in alkaline aqueous solutionsdoi:10.36282/ijasrm/4.10.2019.1647 fatcat:q4vv35so5zelfbi6jmxoixfo2m