Synthesis and corrosion inhibition study of mild steel in 0.5 M hydrochloric acid by 1-((2-arbamoylguanidino) (furan-2-ylmethyl) urea

Abstract

The corrosion inhibition of mild steel in, 0.5M HCl solution by 1-((2-arbamoylguanidino) (furan-2-ylmethyl) urea (CFU) was investigated using weight loss experiment at different temperature (30^oC, 40^oC, 50^oC). The CFU was synthesized and characterized using FTIR and ¹HNMR. The finding indicates that CFU acts as an effective corrosion inhibitor for mild steel in hydrochloric acid solution. The inhibition efficiency and surface coverage of mild steel increased with increasing concentration of CFU, but reduced as temperature increases. Langmuir adsorption isotherm and freundlick adsorption isotherm were used to deduce that the adsorption mechanism was physical adsorption. The estimation of the adsorption also determined the free Gift’s energy at the range of -12KJmol-¹ to -14KJmol-¹, which implies that the reaction was spontaneous. The inhibitive ability of CFU was attributed to the presence of oxygen, nitrogen and aromatic furan in its structure.