scholarly journals Histidine and histidine dimer as green inhibitors for carbon steel in 3wt% sodium chloride solution; Electrochemical, XPS and Quantum chemical calculation studies

2018 ◽  
pp. 2136-2153 ◽  
Author(s):  
Liyun Zhang ◽  
Keyword(s):  
Sodium Chloride ◽  
Carbon Steel ◽  
Quantum Chemical Calculation ◽  
Quantum Chemical ◽  
Chloride Solution ◽  
Sodium Chloride Solution ◽  
Chemical Calculation ◽  
Green Inhibitors

THE INHIBITION EFFECT OF ZINC AND SILICATE IONS ON PITTING CORROSION INDUCED BY CERIUM(III) IONS OF CARBON STEEL IN SODIUM CHLORIDE SOLUTION

2020 ◽  
pp. 2050038
Author(s):  
QIONGWEI LI
Keyword(s):  
Sodium Chloride ◽  
Carbon Steel ◽  
Pitting Corrosion ◽  
Chloride Solution ◽  
Sodium Chloride Solution ◽  
Corrosion Potential ◽  
In Situ Observation ◽  
Inhibition Effect ◽  
Synergistic Inhibition

Pitting corrosion of carbon steel in sodium chloride solution induced by Ce[Formula: see text] and the synergistic inhibition effects of Ce[Formula: see text] and Zn[Formula: see text]/SiO[Formula: see text] were investigated using in-situ observation and electrochemical methods. The results showed that the presence of Ce[Formula: see text] could result in severe pitting corrosion and a positive shift in the corrosion potential. It was found that individual Ce[Formula: see text], Zn[Formula: see text], or SiO[Formula: see text] had low inhibition efficiencies, whereas the combination of Ce[Formula: see text] and Zn[Formula: see text] or SiO[Formula: see text] proved to be highly effective in inhibiting the development of pits in two different ways and in enhancing the corrosion resistance. The pitting corrosion and inhibition mechanisms were discussed based on the results.

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.

scholarly journals Inhibitive effect of N,N'-Dimethylaminoethanol on carbon steel corrosion in neutral sodium chloride solution, at different temperatures

2018 ◽  
Vol 149 ◽  
pp. 01050
Author(s):  
Mohammed Hassoune ◽  
Abdelillah Bezzar ◽  
Latéfa Sail ◽  
Fouad Ghomari
Keyword(s):  
Sodium Chloride ◽  
Carbon Steel ◽  
Potentiodynamic Polarization ◽  
Chloride Solution ◽  
Sodium Chloride Solution ◽  
Steel Corrosion ◽  
Passive State ◽  
Protective Film ◽  
Different Temperatures ◽  
Neutral Sodium

The inhibition of carbon steel corrosion in neutral sodium chloride solution by N,N'- Dimethylaminoethanol (DMEA), at different temperatures, was investigated using weight loss, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. The results obtained confirm that DMEA is a good organic corrosion inhibitor for carbon steel in 0.5M of NaCl (concentration encountered in the Mediterranean seawater), over the whole range of temperatures studied. The inhibition efficiency (IE%) increases with increasing DMEA concentration; it reaches highest value for a concentration around 0.125 mol.L-1. Potentiodynamic polarization data show that, the compound studied in this research predominantly act as anodic-type inhibitor. The EIS study reveals that the addition of DMEA decreases the corrosion rate of carbon steel in neutral sodium chloride solution, due to the fact that the inhibitor molecules are strongly adsorbed on the active sites following Langmuir isotherm, thus leading to the formation of a stable protective film on the steel surface which is able to keep the metal/solution interface in a passive state. Furthermore, the values of the activation parameters, i.e. ΔHa and Ea obtained in this study indicate that the adsorption process of DMEA is endothermic and could be mainly attributed to chemisorption, respectively.

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