Experimental and theoretical structural analysis of Zn(II)‐1‐hydroxyethane‐1,1‐diphosphonic acid corrosion inhibitor films in chloride ions solution

Abstract

This work aims to analyze, through weight loss and X-ray photoelectron spectroscopy (XPS) methods, the inhibitive films of 1-hydroxyethane-1,1-diphosphonic acid (1-hydroxyethylidene-1,1-diphosphonic acid, HEDP) and zinc(II) ions formed on AISI 1020 carbon steel when immersed in solutions containing 30 ppm of chloride ions, 50 ppm of HEDP, and three different concentrations of zinc(II) ions (14, 20, and 30 ppm). Moreover, the results of the experimental surface analyses were compared to molecular modeling studies of the proposed HEDP-Fe(III)/Zn(OH) 2 /HEDP-Zn(II) protective film. The film presented dissimilar structures responsible for the different levels of metallic protection for each particular zinc(II) concentration. In general, the increase in Zn(II) concentration leads to more compact and adherent film formation, with decreased corrosion rates of carbon steel.

A novel Ni–Schiff base complex for motivating glucose electrooxidation in alkaline solutions

“…109 These regions which have a HOMO electron density are available to share their electrons with the vacant orbitals located on the metal surface, leading to the formation of covalent bonds. 110 Indeed, this behavior favors the adsorption of the studied molecule (glucose) on the surface of the substrate and facilitates the charge transfer via its oxidation reaction. In this context, Fig.…”

Surface Analysis of Carbon Steel Protected from Corrosion by a New Ternary Inhibitor Formulation Containing Phosphonated Glycine, Zn<sup>2+</sup> and Citrate

“…Phosphonate-based formulations are well-known for corrosion inhibition of carbon steel [2][3][4][5][6][7][8][9][10][11][12] and the impact of phosphonic acids on environment was reported to be negligible at the concentration levels used for corrosion inhibittion [13,14]. Phosphonic acids show synergistic effect with zinc ions and form complexes [1,[4][5][6]9,10]. A phosphonated aminoacid namely N,N-bis (phosphonomethyl) glycine (BPMG), was reported to be an environmentally friendly compound and also an effective corrosion inhibitor in combination with metal ions like Zn 2+ [12,15].…”

Electrochemical and surface analytical studies of synergistic effect of phosphonate, Zn2+ and ascorbate in corrosion control of carbon steel

“…It is well known that phosphonate/Zn 2+ mixtures are prominent inhibitors to control corrosion of carbon steel in cooling water systems. Synergistic effect existing between phosphonic acids and zinc ions on the inhibition of corrosion of carbon steel has been studied by several researchers 1–7. The reports pointing to synergistic action of phosphonates and Zn 2+ explained that the inhibiting action is due to the formation of protective films on the metal surface 2.…”