Abstract
The inhibitive ability of 2,6-diaminopyridine, tartaric acid and their synergistic effect towards mild steel corrosion in 0.5 M HCl solution was evaluated at various concentrations using potentiodynamic polarization measurements, electrochemical impedance spectroscopy (EIS), and weight loss experiments. Corresponding surfaces of mild steel were examined by atomic force microscope (AFM), field emission scanning electron microscope (FE-SEM), energy dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS) analysis. The experimental results are in good agreement and reveal a favorable synergistic effect of 2,6-diaminopyridine with tartaric acid, which could protect mild steel from corrosion effectively. Besides, quantum chemical calculations and Monte Carlo simulation were used to clarify the inhibition mechanism of the synergistic effect.
Highlights
The inhibitive ability of 2,6-diaminopyridine, tartaric acid and their synergistic effect towards mild steel corrosion in 0.5 M HCl solution was evaluated at various concentrations using potentiodynamic polarization measurements, electrochemical impedance spectroscopy (EIS), and weight loss experiments
The inhibitive ability of organic compounds for metal corrosion is usually attributed to their adsorption ability on metal surfaces, which can block the active sites on metal surfaces and thereby suppress the corrosion attack
The inhibition effect of DAP, TTA and synergistic effect of them at various concentrations towards corrosion of mild steel in 0.5 M HCl was investigated by weight loss methods at 298 K after 8 h immersion
Summary
The inhibitive ability of 2,6-diaminopyridine, tartaric acid and their synergistic effect towards mild steel corrosion in 0.5 M HCl solution was evaluated at various concentrations using potentiodynamic polarization measurements, electrochemical impedance spectroscopy (EIS), and weight loss experiments. 2,6-Diaminopyridine (a common organic dye)[21], tartaric acid (a common beverage additive)[22] are both cheap, low cost, environment-friendly organics. Their poor inhibition efficiency is not enough to protect corrosion of mild steel. Quantum chemical calculations and Monte Carlo simulation[23,24,25] were further adopted to add theoretical support for experimental results and investigate the mechanism of the synergetic effect. The specimens were abraded consecutively with emery papers from 400 to 2000 grit, washed with distilled water, degreased with acetone, dried at room temperature
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