Electrochemical Studies of Pitting Corrosion of Cu-fe Alloy in Sodium Chloride Solutions
نویسنده
چکیده
The electrochemical studies of pitting corrosion of CuFe alloy (70% Cu30%Fe) were carried out in sodium chloride solutions. The techniques of measurements were: open circuit potential, potentiodynamic polarization and electrochemical impedance spectroscopy. The effect of different concentrations of the inorganic additives (WO4 , PO4 , NO2 , B4O7 , CrO4 ) on the pitting corrosion of the alloy in 0.5 M NaCl was also studied. It was found that the alloy underwent pitting corrosion in sodium chloride solution at definite pitting potential depending on the concentration of NaCl according to the relation: Epit = q1 – b1 log − Cl C . The investigated inorganic additives had inhibiting effect on the pitting corrosion of the alloy in 0.5 M NaCl and their efficiency decreases according to the order WO4 > PO4 > NO2 > B4O7 > CrO4 .
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