Corrosion inhibition studies of copper in highly concentrated NaCl solutions
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The influence of the concentration of sodium succinate (SS) on the corrosion and spontaneous dissolution of copper in aerated non-stirred highly concentrated (5.0 M) NaCl solutions was studied at different temperatures (10–60 °C). The investigations involved weight loss as well as potentiodynamic polarization and impedance measurements. The inhibition efficiency increases with increase in the concentration of SS and decreases with temperature. The inhibition mechanism involves adsorption of SS on the copper surface. An adherent layer of inhibitor is postulated to account for the protective effect. Energy dispersion X-ray (EDX) examinations of the electrode surface confirmed the existence of such an adsorbed film. The potential of zero charge (pzc) of copper was studied by the ac impedance technique and the mechanism of adsorption is discussed.
KeywordsCopper NaCl solution Sodium succinate Corrosion inhibition Adsorption EIS
The author thanks Prince Sultan bin Abdulaziz Al-Saud, First Deputy Premier, Minister of Defense and Aviation and Inspector General, and Prince Bandar bin Sultan bin Abdulaziz Al-Saud, the Secretary-General of the National Security Council, for their financial support for this project.
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