scholarly journals Impediment of Iron Corrosion by N,N′-bis[2-hydroxynaphthylidene]amino]oxamide in 3.5% NaCl Solution

Crystals ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1263
Author(s):  
El-Sayed M. Sherif ◽  
Ayman H. Ahmed ◽  
Hany S. Abdo ◽  
Monerah N. DefAllah
Keyword(s):  
Pitting Corrosion ◽  
Chloride Solution ◽  
Electrochemical Impedance ◽  
Nacl Solution ◽  
Iron Corrosion ◽  
X Ray ◽  
Iron Sample ◽  
Cyclic Potentiodynamic Polarization ◽  
Assessment Techniques ◽  
Corrosion Of Iron

Hydrazone [N,N′-bis[2-hydroxynaphthylidene]amino]oxamide] derived from the condensation of ethanedihydrazide with 2-hydroxynaphthalene-1-carbaldehyde was synthesized and assessed on the basis of elemental analysis (CHN) and spectral (IR, mass, 13C/1H NMR and UV-Vis) measurements. The influence of N,N-bis([2-hydroxynaphthylidene]amino)oxamide (HAO) in terms of the inhibition of iron corrosion in concentrated sodium chloride solution (3.5 wt.% NaCl) after various exposure periods was assessed. Numerous electrochemical and spectroscopic assessment techniques were performed. Cyclic potentiodynamic polarization experiments indicated that the presence of HAO and its increased concentration decreased the corrosion of iron in NaCl solution by decreasing the corrosion values, anodic and cathodic currents, and corrosion rate. The electrochemical impedance spectroscopy results showed that HAO molecules greatly increased the corrosion resistance. The chronoamperometric experiments performed at −475 mV (Ag/AgCl) revealed that the HAO molecules decreased the absolute currents and reduced the probability of the occurrence of pitting corrosion. The effect of HAO on the inhibition of iron corrosion was also confirmed through scanning electron microscopy micrographs and energy-dispersive X-ray profile analyses, which proved that the surface of the iron sample exposed to chloride solution alone was pitted, while the presence of HAO molecules reduced the severity of the pitting corrosion. The results confirmed that the presence of HAO molecules inhibits the corrosion of iron and this impact increased when the exposure time was increased to 48 h.

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

Crystals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1516
Author(s):  
El-Sayed M. Sherif ◽  
Ayman H. Ahmed
Keyword(s):  
Corrosion Inhibitor ◽  
Chloride Solution ◽  
Electrochemical Impedance ◽  
Iron Corrosion ◽  
Cyclic Polarization ◽  
Current Time ◽  
Polarization Resistances ◽  
Anodic Reactions ◽  
Corrosion Of Iron ◽  
Microscopy Images

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.

Intermetallic Particles-Induced Pitting Corrosion in 6061-T651 Aluminium Alloy

2011 ◽  
Vol 690 ◽  
pp. 389-392 ◽  
Author(s):  
Kalenda Mutombo
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Aluminium Alloy ◽  
Pitting Corrosion ◽  
Chloride Solution ◽  
Nacl Solution ◽  
X Ray ◽  
Intermetallic Particles ◽  
The Matrix ◽  
Scanning Electron

The polished 6061-T651 aluminium alloy was immersed in 3.5% NaCl solution with about 7 ppm dissolved oxygen. Scanning Electron Microscopy equipped with Energy dispersive X-ray Spectroscopy revealed the presence of Al-Si-Fe-containing particles that acted as cathodic sites and promoted the matrix dissolution. The effect of pH and chloride solution is assessed.

Anticorrosion Behavior of ZnO Nanoparticles Coated on Mild Steel in NaCl Solution

2020 ◽  
Vol 20 (7) ◽  
pp. 4061-4068
Author(s):  
S. Subhasree ◽  
P. Anitha ◽  
K. Kannan ◽  
A. Ramachandran ◽  
J. J. Sheri ◽  
...  
Keyword(s):  
Mild Steel ◽  
Zno Nanoparticles ◽  
Electrochemical Impedance ◽  
Average Diameter ◽  
Polarization Measurement ◽  
Ocimum Sanctum ◽  
Nacl Solution ◽  
X Ray ◽  
Corrosive Solution ◽  
Nano Coating

This work focuses on the environment protected, ecological procedure by the combination of ZnO nanoparticles utilizing the extraction of Ocimum sanctum. The prepared nanoparticles are examined by different methods like Fourier-transform infrared spectroscopy (FTIR), X-ray Diffraction (XRD), Field emission scanning electron microscopy (FE-SEM), Energy Dispersive X-ray Analysis (EDAX). A systematic study has been made on the result of ZnO nano-coating for the corrosion behavior of mild steel. The ZnO nanoparticles of average diameter in the range 18–22 nm were coated on mild steel in nickel bath solution. The anticorrosion properties on the coated mild steel was carefully tested in 3.5% NaCl solution by performing potentio-dynamic polarization measurement and electrochemical impedance spectroscopy. Surface morphology of the coated mild steel immersed in corrosive solution was judged by using SEM with EDAX. The ZnO nano coating has shown a perfect protection against corrosion and the shielding capability is in the range between 86–95%. The incorporation of ZnO nanoparticles has upgraded the process of mild steel in all corrosion media are subjected to investigation.

scholarly journals Role of Vanadium Additions on the Corrosion Mitigation of Ti-6Al-xV Alloy in Simulated Body Fluid

Metals ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 903 ◽  
Author(s):  
El-Sayed M. Sherif ◽  
Sameh A. Ragab ◽  
Hany S. Abdo
Keyword(s):  
Simulated Body Fluid ◽  
Body Fluid ◽  
Immersion Time ◽  
Electrochemical Impedance ◽  
X Ray Diffraction ◽  
X Ray ◽  
Cyclic Potentiodynamic Polarization ◽  
Elemental Analyses ◽  
Corrosion Behaviors

The manufacturing of different Ti-6Al-xV (x = 2, 4, 6, and 8 wt.%) alloys using a mechanical alloying technique was reported. The corrosion behaviors of these newly fabricated alloys after 1, 24, and 48 h exposure to a simulated body fluid (SBF) were assessed using cyclic potentiodynamic polarization, electrochemical impedance spectroscopy, and chronoamperometric measurements. Surface morphology and elemental analyses after corrosion for 48 h in SBF were reported using scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) examinations. An X-ray diffraction investigation characterized the phase analyses. All results indicated that the increase of V content significantly decreases both uniform and pitting corrosion. This effect also increases with prolonging the immersion time to 48 h before measurement.

Study on Corrosion Behavior of Al-Zn-In and Al-Zn-Ga Alloys in NaCl Solution

2011 ◽  
Vol 284-286 ◽  
pp. 1701-1704
Author(s):  
Jing Ling Ma ◽  
Jiu Ba Wen ◽  
Gao Lin Li
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Electrochemical Impedance Spectroscopy ◽  
Corrosion Behavior ◽  
Electrochemical Impedance ◽  
Nacl Solution ◽  
X Ray ◽  
Inductive Loop ◽  
Capacitive Loop ◽  
Scanning Electron

The corrosion behavior of Al-5Zn-0.03In and Al-5Zn-0.03Ga alloys in 3.5 % NaCl solution has been examined by electrochemical methods, scanning electron microscopy, X-ray microanalysis, electrochemical impedance spectroscopy. The results demonstrate that the alloys differ in the microstructure, corroded morphology and electrochemical properties. For Al-5Zn-0.03In alloy, the precipitates enriched in Al and Zn initiates pitting. For Al-5Zn-0.03Ga alloy, corrosion occurs more uniformly, the corrosion of the alloy occurred via the formation of a surface Ga-Al amalgam alloy. The EIS of Al-5Zn-0.03In alloy contains a capacitive loop and an inductive loop; the inductive loop can be attributed to the presence of the pitting. The EIS of Al-5Zn-0.03Ga alloy contains only a capacitive loop.

scholarly journals Influence of Milling Route on the Corrosion Passivation of Al-2%SiC Nanocomposites in Chloride Solutions

Crystals ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1231
Author(s):  
Saud M. Almotairy ◽  
El-Sayed M. Sherif ◽  
Nabeel H. Alharthi ◽  
Hany S. Abdo ◽  
Hamad F. Alharbi ◽  
...  
Keyword(s):  
Ball Milling ◽  
Pitting Corrosion ◽  
Chloride Solution ◽  
Milling Time ◽  
Electrochemical Impedance ◽  
Corrosion Current ◽  
Cyclic Polarization ◽  
Elemental Analyses ◽  
Ball Milling Time ◽  
Corrosion Passivation

In this work, the fabrication of three Al-2wt.% SiC nanocomposites processed by novel milling route was carried out. The beneficial influence of milling route on the corrosion passivation of the new fabricated composites was investigated. The cyclic polarization measurements have proved that increasing the time of ball milling highly reduced the corrosion of Al-SiC nanocomposite via reducing obtained corrosion current and so increasing the corrosion resistance. These results were affirmed by the electrochemical impedance spectroscopy experiments. The pitting corrosion of the manufactured composites was also reported, and its intensity decreased with the increase of ball milling time. The electrochemical experiments were also performed after expanding the exposure time in the chloride solution to 24 and 48. It was found that both the uniform and pitting corrosion decrease with prolonging the time. The study was complemented by examining the surface morphology and the elemental analyses for the different composites by using surface analyses techniques.

Electrodeposition of Salicylideneaniline and its Corrosion Behavior

2012 ◽  
Vol 554-556 ◽  
pp. 385-389
Author(s):  
Zailelah Zainoldin ◽  
Mohamad Kamal Harun ◽  
Hadariah Bahron ◽  
Karimah Kassim
Keyword(s):  
Mild Steel ◽  
Corrosion Behavior ◽  
Chloride Solution ◽  
Steel Surface ◽  
Sodium Chloride Solution ◽  
Electrochemical Impedance ◽  
Sodium Hydroxide Solution ◽  
Distilled Water ◽  
Nacl Solution ◽  
Mild Steel Surface

Electrodeposition was carried out on mild steel surface in 0.3 M sodium hydroxide solution (70% distilled water: 30% ethanol) containing 0.1 M salicylideneaniline using cyclic voltammetry and chronoamperometry techniques. Both techniques show the formation of the films on the mild steel surface. The corrosion behavior of electrodeposited mild steel was studied using electrochemical impedance spectroscopy (EIS) technique at various immersion times in 0.5 M sodium chloride solution (NaCl). The study indicates that the resistance of mild steel against corrosion increases after being electrodeposited with salicylideneaniline. However the films tend to diminished after 24 hours being immersed in 0.5 M NaCl solution.

Effect of carbides on sensitivity of pitting corrosion in Inconel 718 alloy

2020 ◽  
Vol 67 (2) ◽  
pp. 158-165
Author(s):  
Xianping Wei ◽  
Wen Jie Zheng
Keyword(s):  
Pitting Corrosion ◽  
Inconel 718 ◽  
Design Methodology ◽  
Electrochemical Impedance ◽  
Immersion Test ◽  
Nacl Solution ◽  
Inconel 718 Alloy ◽  
Content Type ◽  
Corrosion Susceptibility ◽  
Dynamic Electrochemical Impedance Spectroscopy

Purpose This paper aims to expand the application area of Inconel 718 alloy in marine environment, the sensitivity of pitting corrosion should be analyzed and discussed, especially the effect of block carbides. Design/methodology/approach Effect of carbides on the sensitivity of pitting corrosion for Inconel 718 alloy was carried out at 30°C in 3.5% NaCl solution using dynamic electrochemical impedance spectroscopy and anodic polarization techniques. In addition, the initiation of pitting corrosion was investigated by immersion test in 0.05 M HCl + 6% FeCl3 solution. Findings As a result, the precipitation of carbides, as the initiation of pitting corrosion, increased pitting corrosion susceptibility, especially the block carbides could lead to deep-spalling. Within that process, temperature and potential acted as the main controlling factors, and the effect of the latter was more distinct. Originality/value The initiation of pitting corrosion was revealed by the immersion test. The mechanism of pitting corrosion was analyzed and discussed.

scholarly journals Effects of Sodium Phosphate and Sodium Nitrite on the Pitting Corrosion Process of X70 Carbon Steel in Sodium Chloride Solution

Materials ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 5392
Author(s):  
Yongyan Zhu ◽  
Jiayi Ding ◽  
Jianli Zhang ◽  
Liang Li
Keyword(s):  
Sodium Chloride ◽  
Carbon Steel ◽  
Sodium Nitrite ◽  
Pitting Corrosion ◽  
Chloride Solution ◽  
Sodium Phosphate ◽  
Sodium Chloride Solution ◽  
Electrochemical Impedance ◽  
Protective Oxide ◽  
Salt Film

In this paper, effects of sodium phosphate (Na3PO4) and sodium nitrite (NaNO2) on the pitting corrosion of X70 carbon steel in 0.10 mol/L NaCl solution were investigated by potentiodynamic polarization technique, electrochemical impedance spectroscopy (EIS) method, scanning electron microscope (SEM) and scanning electrochemical microscope (SECM). The SECM equipment was used to observe the dynamic processes of the pitting corrosion in situ. Na3PO4 or NaNO2 in the sodium chloride solution decreased the local anodic dissolution and increased the pitting resistance of the specimen. By analysis and comparison, it can be concluded that the inhibition effect of Na3PO4 is mainly due to the formation of a salt film, while the corrosion inhibition of NaNO2 is principally attributed to a protective oxide film on the electrode surface.

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