Corrosion inhibition characteristics of a novel salycilidene isatin hydrazine sodium sulfonate on carbon steel in HCl and a synergistic nickel ions additive: A combined experimental and theoretical perspective

Comparative Studies of the Corrosion Inhibition Efficacy of a Dicationic Monomer and Its Polymer against API X60 Steel Corrosion in Simulated Acidizing Fluid under Static and Hydrodynamic Conditions

“…In the blank solution (15 wt % HCl), the E ocp begins at −476 mV vs SCE and progresses in a positive direction until a steady-state condition was reached. Such progression, according to authors, 20 , 21 is due to the premier corrosion process of the pre-exposure, air-formed oxide layer, and the attack on the substrate surfaces. Compared to the E ocp vs time graph of the blank, the E ocp in the inhibited systems is shifted in the anodic direction.…”

“…Normally, the mathematical coefficient n lies in the range −1 ≤ n ≤ 1. 21 , 28 , 29 The CPE would behave as an inductor if n = −1, a resistor if n = 0, Warburg impedance if n = 0.5, and a capacitor if n = 1. 21 , 28 , 29 In addition, the value of n provides information on the roughness of the surface film.…”

“… 21 , 28 , 29 The CPE would behave as an inductor if n = −1, a resistor if n = 0, Warburg impedance if n = 0.5, and a capacitor if n = 1. 21 , 28 , 29 In addition, the value of n provides information on the roughness of the surface film. 21 , 28 , 29 A small value of n is indicative of a rough surface.…”

“…Generally, organic inhibitors inhibit metal corrosion through the adsorption mechanism. 13 , 21 , 39 This involves the substitution of adsorbed water molecules and other corrosive species on the metal surface by adsorbed inhibitor molecules. 13 , 21 , 39 Several factors affect the inhibition process.…”

“… 13 , 21 , 39 This involves the substitution of adsorbed water molecules and other corrosive species on the metal surface by adsorbed inhibitor molecules. 13 , 21 , 39 Several factors affect the inhibition process. 13 , 21 , 39 Most importantly, the metal surface charge and the state of an organic molecule in a corrosive environment have a profound influence on the adsorption process.…”