Abstract
Aqueous extract solution of Mahaleb seed (ASMS) was prepared using a simple and safe method. ASMS was tested to examine its potential to act as a green corrosion inhibitor for preventing the dissolution of Carbon steel in highly concentrated corrosive 2 M H2SO4 and 2 M H3PO4 using an electrochemical polarization Tafel plot and electrochemical impedance spectroscopy. ASMS provided a slight increase in the inhibition efficiency of H3PO4 (89%) compared with H2SO4 (86%). Fourier transform infrared spectroscopy (FTIR) and electronic scanning microscopy (SEM) were used to prove that adsorption of ASMS occurred on the metal surface. The thermodynamic adsorption and thermodynamic activation parameters were calculated at a range of concentrations and temperatures. The physisorption of ASMS followed the Langmuir adsorption isotherm (R2 = 0.98). Finally, the role of ASMS as a protection mechanism was discussed.
Highlights
A significant portion of the annual costs of the oil-production concerns worldwide is assigned to solving corrosion problems
The primary objective of this study is to examine and compare the ability of Mahaleb seed extract (ASMS) to control the corrosion of carbon steel in corrosive 2 M H2 SO4 and 2 M H3 PO4
It was suggested [49] that all constituents of the inhibitor support each other in the inhibition process, so it does not make sense to determine which specific compound is adsorbed on the metal process, so it does make sense and to determine which specificitscompound is act adsorbed on the metal inhibitor
Summary
A significant portion of the annual costs of the oil-production concerns worldwide is assigned to solving corrosion problems. Laboratory studies continue to find viable solutions to control the corrosion process as research and methods are expanded to reduce its severity. These studies have included various methods such as anodic protection, cathodic protection, the use of inhibitors, and conductive coating. Inhibitors are chemical compounds that are added in small proportions to a solution so that it is adsorbed on the surface of the metal and forms a thin film that prevents direct contact between the metal and corrosive solution [1]. Fekry et al [2] pointed out that the addition of organic compounds with rich electron heteroatoms such as P, O, N, and S is an excellent way to inhibit the corrosion of steel materials in acid solution [3,4,5,6], the efficiency of the inhibitory process depends mostly on the types and structures of adsorbed film on the metal surface [7,8]
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