Thermodynamic Characteristics of Camel's Urine as an Inhibitor for Mild Steel in 1.5 M H₂SO₄ Acid Solution

Abstract

Problem statement: The corrosion inhibition of mild steel in 1.5 M H 2 SO 4 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 H 2 SO 4. 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 (∆G o ads) emphasize the spontaneity of the adsorption process and stability of the adsorbed layer. Results: The estimated high, positive value of ∆H o ads 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.

Electrochemical and computational study of gumexudatesfromCanarium schweinfurthiias green corrosion inhibitor for mild steel in HCl solution

“…Corrosion is a serious economic and environmental problem and because of this, several researches have been carried out with the aimed of controlling or preventing the loss of valuable metals [1][2][3]. Corrosion of metals such as mild steel has been given considerable attention because during industrial processes such as acid wash, etching, descaling and prickling, corrosion cannot be avoided.…”