Alleviation of Iron Corrosion in Chloride Solution by N,N′-bis[2-Methoxynaphthylidene]amino]oxamide as a Corrosion Inhibitor

Abstract

The alleviation of iron corrosion in 3.5% NaCl sodium chloride solution using N,N′-bis[2-methoxynaphthylidene]amino]oxamide (MAO) as a corrosion inhibitor has been reported. The work was achieved using various investigation techniques. Potentiodynamic cyclic polarization (PCP) displayed a powerful inhibition for the corrosion via reducing the iron’s cathodic and anodic reactions. This was reflected in reduced corrosion currents and increased polarization resistances in the presence and upon the increase of MAO concentration. The electrochemical impedance spectroscopy results indicated that MAO molecules provoke the corrosion resistance via increasing polarization resistance. The power of MAO on decreasing pitting attack was also investigated through measuring the change of current with time at −0.475 V(Ag/AgCl). Scanning electron microscopy images were taken of the surface after the current–time measurements were performed in the absence and presence of MAO. The current-time experiments indicated that MAO highly mitigates the corrosion of iron. The energy dispersive X-ray analyzer reported the products found on the tested surfaces. The effect of extending the exposure time from 1 h to 48 h was also tested and was found to alleviate the corrosion of iron, whether MAO molecules are absent or present.

Methylenedisalicylic Acid as a Biocorrosion Inhibitor for Aluminum in Concentrated Sodium Chloride Solutions

“…The values of these corrosion parameters were obtained as reported in previous work. 32 , 33 , 43 , 44 …”

“…The symbols of these corrosion data can be defined as follows: β c and β a are the cathodic and anodic Tafel slopes, respectively; E Corr and j Corr are the corrosion potential and corrosion current density, respectively; R Corr is the corrosion current, and R P is the polarization resistance. The values of these corrosion parameters were obtained as reported in previous work. ,,, …”

“…These EIS data were fitted using ZSimpWin v.3 software program, and the best equivalent circuit is depicted in Figure . This circuit has been employed as the best fit in many other studies. , The parameters of the circuit can be expressed as follows: the solution resistance, R s ; the two polarization resistances, R P1 and R P2 ; and two constant phase elements, Q 1 and Q 2 . The values of these elements after the different immersion periods of time are gathered in Table .…”

Enhancement of Surface and Interface Properties of Low Carbon Steel by Hybrid ZnO and NiO Nanoparticles Reinforced Tin Coating

“…βc and βa are the cathodic and anodic Tafel slopes, respectively, and E Corr , j Corr , R P , and R Corr are the corrosion potential, corrosion current density, polarization resistance, and corrosion current. The values of βc, βa, E Corr , and j Corr were obtained, as reported in the previous work [34][35][36]. Moreover, the values of both R P and R Corr were calculated according to the following relations [36][37][38][39]:…”

“…The values of βc, βa, E Corr , and j Corr were obtained, as reported in the previous work [34][35][36]. Moreover, the values of both R P and R Corr were calculated according to the following relations [36][37][38][39]:…”