Ayoola, A. A. and Durodola, B. M. and Babalola, Rasheed and Fayomi, O. S. I and Okoji, Anthony I. and Agbeyegbe, G. A. and Obigwe, C. (2026) Corrosion Inhibition on Mild Steel using Zinc Phosphating Modified with Magnesium and Calcium Additives. Portugaliae Electrochimica Acta, 44. pp. 85-94.
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Abstract
MS is a very versatile and useful alloy in metal industry, since it is available and affordable, but it is prone to corrosion. This study investigated MS corrosion inhibition by modifying Zn₃(PO₄)2 bath with MgO and, then, with combined MgO and CaO additives. Different phosphating times (40, 60 and 80 min) and T (65 and 80 °C) were considered. Ct from 0 to 1.8 g/L MgO and combined MgO/CaO additives were added to Zn₃(PO₄)2 bath. SEM analysis of the coated samples was carried out. The specimens were also immersed in 3.5 wt% NaCl, for WL testing. Obtained results showed that the highest IE(%) of 56% was obtained for the MS sample at a phosphating T of 65 °C and Ct of 1.8 g/L MgO additive. For combined MgO and CaO additive, an IE(%) of 32% was obtained, at 65 °C, with a Ct of 0.9 g/L. MgO and CaO adsorption process (separately and combined) onto MS followed Freundlich’s adsorption model. ΔG indicated a physical adsorption process, and ΔH indicated an exothermic adsorption process, while ΔS during coating revealed a decrease in the process randomness degree.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Ca additive; corrosion; Mg additive; MS; Zn phosphating. |
| Subjects: | T Technology > TN Mining engineering. Metallurgy T Technology > TP Chemical technology |
| Divisions: | Faculty of Engineering, Science and Mathematics > School of Engineering Sciences |
| Depositing User: | Patricia Nwokealisi |
| Date Deposited: | 04 Mar 2025 15:04 |
| Last Modified: | 04 Mar 2025 15:04 |
| URI: | http://eprints.covenantuniversity.edu.ng/id/eprint/18849 |
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