Green Approach to Corrosion Inhibition of Mild Steel using Emilia Sonchifolia and Vitex Doniana in 2.5M HCl Medium
Iloamaeke I. M1, Onuegbu T. U.2, Umeobika U. C.3, Umedum N. L4
1Iloamaeke I. M., Chemistry Department ,Nnamadi university Awka. Anambra State. Nigeria.
2Onuegbu T.U., Chemistry Department ,Nnamadi university Awka. Anambra State. Nigeria.
3Umeobika U.C., Chemistry Department ,Nnamadi university Awka. Anambra State. Nigeria.
4Umedum N.L., Chemistry Department ,Nnamadi university Awka. Anambra State. Nigeria
Manuscript received on February 05, 2013. | Revised Manuscript received on February 09, 2013. | Manuscript published on February 15, 2013. | PP: 48-52 | Volume-1 Issue-3, February 2013 | Retrieval Number: C0136020213/2013©BEIESP
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© The Authors. Published By: Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Abstract: This research studied the use of leaves extract of Emilia sonchifolia and Vitex doniana as corrosion inhibitors of mild steel in 2.5M HCl medium using gasometric method at 30oC and 60oC. The result obtained showed that inhibition efficiency of Emilia sonchifolia leaves extract on the surface of the mild steel was 60.38% at 30oC and 53.13% at 60oC while that of Vitex doniana leave extract was 68.22% at 30 oC and 54.98% at 60oC. Adsorption of Emilia sonchifolia leaves extract on the surface of the mild steel follows Langmuir, Tempkin and Freunlich adsorption isotherm while adsorption of Vitex donania leaves extract on the surface of the mild steel obeyed Langmuir and Tempkin adsorption isotherm. Physical adsorption was proposed from the Ea, ΔH and ΔG calculated.
Keywords: Corrosion, inhibitor, mild steel, Emilia sonchifolia and Vitex doniana.