Kinetic and thermodynamic evaluation of azithromycin as a green corrosion inhibitor during acid cleaning process of mild steel using an experimental and theoretical approach

New Inhibitor Based on Hydrolyzed Keratin Peptides for Stainless Steel Corrosion in Physiological Serum: An Electrochemical and Thermodynamic Study

“…To calculate the apparent activation energy ( E a ), taking into account k g (g m −2 h −1 ), the linearized form of the Arrhenius Equation (15) [ 42 , 47 , 48 , 49 , 50 ] is applied for the two studied temperatures, Equations (15)–(18). where A is the Arrhenius pre-exponential factor, T is the absolute temperature (K) and R is the universal gas constant (8.31 J mol −1 K −1 ).…”

“…As an alternative to the Arrhenius model, the transition-state equation will be applied for HKER concentrations varying from 25 mg L −1 to 40 mg L −1 . The linearized form of the transition-state equation is given by Expression (20) [ 42 , 47 , 48 , 49 ]: where Δ H a (kJ mol −1 ) is the enthalpy of activation and Δ S a (J mol −1 K −1 ) is the entropy of activation, respectively; k g is the corrosion rate, expressed as the gravimetric corrosion index, h is Planck’s constant, 6.626 × 10 −34 J s; N is Avogadro’s number, 6.023 × 10 23 mol −1 ; T is the absolute temperature (K); R is the universal gas constant (8.31 J mol −1 K −1 ).…”

“…To calculate the apparent activation energy (E a ), taking into account k g (g m −2 h −1 ), the linearized form of the Arrhenius Equation ( 15) [42,[47][48][49][50] is applied for the two studied temperatures, Equations ( 15)- (18).…”

Electrochemical evaluation of the anti-corrosion potential of selected amino acids on magnesium in aqueous sodium chloride solutions

“…PDP measurement is a direct current (DC) electrochemical technique used in corrosion measurements in which a range of potential is applied on an electrode thus driving the reactions on the surface towards the anodic or cathodic direction depending on the direction of the potential sweep. The polarization curve is a plot of the potential versus current density (Ikeuba et al , 2023). Polarization curves enable the quick detection of localized corrosion and corrosion rate alongside other kinetic parameters such as corrosion potential ( E corr ), corrosion current density ( i corr ), anodic and cathodic Tafel slopes ( β a and β c ) and efficiency of the inhibitor (%IE) in the presence of the inhibitors (Ikeuba and Zhang, 2023).…”

Principles and theories of green chemistry for corrosion science and engineering: design and application

“…471–475 In two distinct reports, investigations were carried out on the inhibition performance of azithromycin for stainless steel 316L in KOH 476 and mild steel in 2 M HCl. 477 These investigations employed electrochemical and surface analytical methods and revealed the ability of azithromycin to significantly reduce the corrosion rate even at minimal doses, functioning as a mixed inhibitor. The proposed inhibition mechanism for both cases involved physical adsorption, with the Freundlich isotherm governing the inhibition process in SS 316L/KOH and the Langmuir isotherm in MS/2 M HCl.…”