The Synergistic Effect of Chloride Ion and 1,5-Diaminonaphthalene on the Corrosion Inhibition of Mild Steel in 0.5 M Sulfuric Acid: Experimental and Theoretical Insights.

Abstract

The inhibition efficiency of 1,5-Diaminonaphthalene (1,5DNA) compound was studied by itself as well as in a mixture that included sodium chloride (NaCl), noted [1.5DNA][Cl − ], for mild steel in 0.5 M sulfuric acid. Gravimetric, electrochemical techniques and computational chemistry calculations were utilized for the assessment of corrosion inhibition efficiency and explanation of the mechanism involved during the corrosion inhibition process. The results show that inhibition efficiencies on mild steel increase with increase in concentration of the inhibitor and enhancement in inhibition efficiency was observed on addition of sodium chloride due to synergism. This inhibition has been attributed to the stabilization of adsorbed inhibitor film and, consequently, increasing its inhibitive properties. The [1.5DNA][Cl − ] acts as mixed type inhibitor and the Nyquist curves show that with the increase in the concentration, the charge transfer resistance R ct increased. In addition, [1.5DNA][Cl − ] obeyed Langmuir monolayer adsorption isotherm. Moreover, Molecular Dynamic Simulations and DFT calculations showed that [1.5DNA][Cl − ] owned a higher adsorption ability.

N‐methyl‐2‐hydroxyethylammonium oleate ionic liquid performance as corrosion inhibitor for mild steel in hydrochloric acid medium

“…It means that chloride ions act as a bridge to subsequent adsorption of [m‐2HEA][Ol] on the steel surface, and then physisorption turns into chemisorption. A similar behavior was reported for different molecules on metal surfaces elsewhere, [ 52,71,79–81 ] evidencing the importance of halide ions on the adsorption mechanism. The second possible mechanism is that chemisorption could be caused by electron sharing between the IL and the vacant d ‐orbital of the metal, as reported by Guo et al [ 52 ] In addition, physisorption could occur through lone electron pair donation of N and O heteroatoms to the vacant d ‐orbital of iron.…”

The use ofBrugmansia arboreaas a green corrosion inhibitor for AISI 1018 carbon steel in acid media

“…From Gibbs free energy DG 0 ads the interaction and the adsorption type of the molecules onto the metal surface can be characterized. Generally, DG 0 ads values up to −20 kJ mol −1 are typically correlated to a physisorption and indicates that interactions are electrostatic between organic molecules and charged surface metal; meanwhile values around or higher than −40 kJ mol −1 are associated with chemisorption, as a result of electron transfer form organic molecules to the metal surface forming coordinate-type bonds (51,52).…”

Experimental and Theoretical Investigations of Argania spinosa’s Extracts on the Antioxidant Activity and Mild Steel Corrosion’s Inhibition in 1 M HCl

“…In their work on diaminonaphthalene as a mild steel corrosion inhibitor, A. El Guerraf et al proved the synergetic effect of chloride ions [48]. On the other hand, this finding was further supported by relatively more shifts in the values of βc as compared to the values of β a .…”