Abstract
Problem statement: The corrosion inhibition of mild steel in 1.5 M H2SO4 by Camel’s Urine (CU) addition was evaluated at five different temperatures in the range from 30-70°C by weight loss measurements. CU acts as a good inhibitor for the corrosion of mild steel in 1.5 M H2SO4. The value of inhibition efficiency increases with increasing both inhibitor concentration and solution temperature. Approach: The adsorption of CU constituents on the mild steel surface obeys the Langmuir adsorption isotherm suggesting a monolayer adsorption of CU species. Thermodynamic parameters for CU adsorption and mild steel corrosion were evaluated. The negative values of (ΔGoads) emphasize the spontaneity of the adsorption process and stability of the adsorbed layer. Results: The estimated high, positive value of ΔHoads ensures that CU species is adsorbed chemically on mild steel surface. All values of E*app for mild steel corrosion in inhibited solutions were lower than that for the uninhibited solution indicating the occurrence of chemisorption mechanism. Conclusion: The surface morphology of mild steel in absence and presence of inhibitor revealed that with increasing both CU concentration and solution temperature, mild steel surface is modified and looks smooth. Good correlation between the inhibitor constituents and its inhibitory action was obtained.
Highlights
Corrosion control of metals is an important activity of technical, economical, environmental and aesthetical importance
Corrosion rate measurements: Weight loss method was employed for mild steel corrosion rate measurements in absence and presence of various concentrations of Camel’s Urine (CU) at different temperatures
The present results are in good agreement with those obtained previously by (Noor, 2004) when CU had been studied as corrosion inhibitor for mild steel in HCl solution at different temperatures
Summary
Corrosion control of metals is an important activity of technical, economical, environmental and aesthetical importance. Considerable efforts have been deployed to find suitable compounds of organic origin to be used as corrosion inhibitors in various corrosive media, to either stop or delay the maximum attack of a metal (Umoren et al, 2008). The known hazard effects of most synthetic organic inhibitors and the need to develop cheap, non-toxic and environmentally benign processes have made researchers to focus on the use of natural products. These natural organic compounds are either synthesized or extracted from aromatic herbs, spices and medicinal plants. Various natural products from plant origins e.g., Zenthoxylum-alatum fruits extract (Gunasekaran and Chauhan, 2004), Telfaria Occidentalis extract (Oguzie, 2005), Khilla extract
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