Potentiostatic studies of the corrosion of grey cast iron in sulphuric acid and sodium hydroxide solutions |
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| Affiliation: | 1. Corrosion Research Laboratory, Department of Applied Chemistry, Faculty of Engineering and Technology, Aligarh Muslim University, Aligarh, India;2. Department of Chemistry, College of Science, Taibah University, Yanbu, Al-Madina, Saudi Arabia;3. Department of Chemistry, Faculty of Science, Aligarh Muslim University, Aligarh, India;1. Department of Studies in Chemistry, Manasagangotri, University of Mysore, Mysuru-570006, Karnataka, India;2. Post Graduate Department of Chemistry, Sarada Vilas College, Krishnamurthypuram Mysuru 570026, India;3. Department of Chemistry, Sri Venkateswara College, Dhaula Kuan, New Delhi 110021, India |
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| Abstract: | A potentiostatic investigation of the corrosion behaviour of two grey cast iron specimens has been performed in 2.5 M H2SO4 and 1.0 M NaOH solutions in the temperature range from 303 to 333 K. A similar determination was also made with both specimens in 5.0 M solutions of both HCl and HNO3 at 303 K. The rates of corrosion at various temperatures (T) for the equilibrium, active and passive states were obtained from the corresponding values of the current densities (i) at such temperatures. Activation energies (E) of the corrosion process in each state were derived. The influence of certain sulphur and nitrogen containing compounds as inhibitors for acid or alkali corrosion of cast iron samples was also investigated at 303 K. The greatest corrosion protection was achieved with both types of cast iron in H2SO4 solution containing thiourea, while this substance showed only a limited protective effect in NaOH solution. |
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