Effect of DC Currents and Strain on Corrosion of X80 Steel in a Near-Neutral Environment

The corrosion behavior of X80 steel in a near-neutral soil-simulated solution under various DC stray currents and applied strains was investigated using electrochemical measurements (open circuit potential, linear polarization, and electrochemical impedance spectroscopy) and surface analysis techniques. Our results show that a DC stray current has a substantially greater effect on steel corrosion compared to applied strain. However, strain could slow down the corrosion rate in specific conditions by affecting the composition of corrosion products and the structure of the corrosion scale on the surface of the steel. Although the porosity of the corrosion scale of steel without an applied strain will increase with increasing DC currents, once strain is applied, the corrosion scale will become denser. Furthermore, both DC currents and strain can promote steel pitting, and the number and size of pitting holes will increase significantly with an increase in current densities.

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From Waste to Valuable Resource: Lignin as a Sustainable Anti-Corrosion Coating

Coatings ◽

10.3390/coatings8120454 ◽

2018 ◽

Vol 8 (12) ◽

pp. 454 ◽

Cited By ~ 8

Author(s):

Arman Dastpak ◽

Kirsi Yliniemi ◽

Mariana de Oliveira Monteiro ◽

Sarah Höhn ◽

Sannakaisa Virtanen ◽

...

Keyword(s):

Stainless Steel ◽

Open Circuit Potential ◽

Electrochemical Impedance ◽

Steel Corrosion ◽

Linear Sweep Voltammetry ◽

Corrosion Current ◽

Polymer Coatings ◽

Open Circuit ◽

Linear Sweep ◽

Cyclic Potentiodynamic Polarization

In this study, a waste of biorefinery—lignin—is investigated as an anticorrosion coating on stainless steel. Corrosion behavior of two lignin types (hardwood beech and softwood spruce) was studied by electrochemical measurements (linear sweep voltammetry, open circuit potential, potentiostatic polarization, cyclic potentiodynamic polarization, and electrochemical impedance measurements) during exposure to simulated body fluid (SBF) or phosphate buffer (PBS). Results from linear sweep voltammetry of lignin-coated samples, in particular, demonstrated a reduction in corrosion current density between 1 and 3 orders of magnitude cf. blank stainless steel. Furthermore, results from cross cut adhesion tests on lignin-coated samples demonstrated that the best possible adhesion (grade 0) of ISO 2409 standard was achieved for the investigated novel coatings. Such findings suggest that lignin materials could transform the field of organic coatings towards more sustainable alternatives by replacing non-renewable polymer coatings.

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Forming of Corrosion Inhibitor Film during Turbulent Flow

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.66-68.540 ◽

2011 ◽

Vol 66-68 ◽

pp. 540-544 ◽

Cited By ~ 2

Author(s):

Ahmed Y. Musa ◽

Abdul Amir H. Kadhum ◽

Abu Bakar Mohamad ◽

Mohd Sobri Takriff

Keyword(s):

Turbulent Flow ◽

Potentiodynamic Polarization ◽

Flow Condition ◽

Open Circuit Potential ◽

Electrochemical Impedance ◽

Steel Corrosion ◽

Film Structure ◽

Open Circuit ◽

Mild Steel Corrosion ◽

Scanning Electron

The organic material named 4-amino-5-phenyl-4H-1, 2, 4-trizole-3-thiol (APTT) was studied as inhibitor for mild steel corrosion in 1.0 M HCl at 30 °C. The effects of turbulent flow on the inhibition process were characterized using open circuit potential (OCP), potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM). Turbulent flow condition experiments were simulated by Rotating Cylinder Electrode (RCE). Results obtained from changes of open circuit potential (OCP) with immersion time, potentiodynamic polarization, and impedance measurements all are in good agreement and indicated that the formation and the development of the inhibitor film were flow rate dependence. The scanning electron micrograph confirmed film structure is dependence of flow condition.

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Effect of Different Dopants in Films TEOS/MPTS Used to Protect the Carbon Steel

Materials Science Forum ◽

10.4028/www.scientific.net/msf.805.167 ◽

2014 ◽

Vol 805 ◽

pp. 167-171 ◽

Cited By ~ 1

Author(s):

F.S. Silva ◽

P.H. Suegama ◽

W.P. Silva ◽

A.W. Rinaldi ◽

N.L.C. Domingues ◽

...

Keyword(s):

Carbon Steel ◽

Open Circuit Potential ◽

Hybrid Film ◽

Electrochemical Impedance ◽

Open Circuit ◽

The Other ◽

Nacl Solution ◽

Hybrid Films ◽

Impedance Measurements ◽

Current Densities

Schiff bases m-toluene N-Salicylideneaniline (m-TOL), (B) m-nitro-N- Salicylideneaniline (m-NTR) and (C) m-methoxy-N-salicylideneaniline (m-MTX) and cerium ions were studied added to 3.5 wt.% NaCl solution and added to the hybrid film based tetraethoxysilane (TEOS) e 3-methacryloxypropyltrimethoxysilane (MPTS). The polarization measurements showed lower current densities for the steel in NaCl with m-MTX, indicating that the m-MTX may be acting as an inhibitor. The hybrid films were doped with the m-MTX, Ce (III) or Ce (IV). Electrochemical measurements of open circuit potential (EOC), polarization curves and electrochemical impedance spectroscopy (EIS), were used to evaluate the corrosion behavior of the hybrid films. According Electrochemical Impedance measurements, all hybrid films, provided protection to the carbon steel. The films doped with Ce (IV), provided greater protection than the other, which indicates that this is the most suitable dopant for use in films.

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Influence of pH on the Electrochemical Bahavior of 00Cr15Ni7Mo2Cu2 Supermartensitic Stainless Steel in 3.5% NaCl Solutions

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.581-582.1058 ◽

2012 ◽

Vol 581-582 ◽

pp. 1058-1061

Author(s):

Jia Qun Rui ◽

Jun Li ◽

Hu Dai Sun ◽

Kun Yu Zhao ◽

Zhi Dong Li ◽

...

Keyword(s):

Stainless Steel ◽

Open Circuit Potential ◽

Electrochemical Impedance ◽

Open Circuit ◽

Pitting Potential ◽

Supermartensitic Stainless Steel ◽

Pitting Corrosion Resistance ◽

Polarization Technique ◽

Current Densities ◽

Influence Of Ph

This objective is to study the influence of pH on the electrochemical behavior of 00Cr15Ni7Mo2Cu2 supermartensitic stainless steel in 3.5% NaCl solutions using potentiondynamic polarization technique, open circuit potential tests and electrochemical impedance spectroscopy (EIS).The study reveals that the pitting potential (Eb) is higher, the passivation current densities (ip) is lower and the electrochemical impedance increases with the pH. The results indicate that this stainless steel offer good pitting corrosion resistance with the pH increasing in 3.5% NaCl solutions.

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Electrochemical Investigation of Corrosion of X80 Steel under Elastic and Plastic Tensile Stress in CO2 Environment

Metals ◽

10.3390/met8110949 ◽

2018 ◽

Vol 8 (11) ◽

pp. 949 ◽

Cited By ~ 2

Author(s):

Wei Wu ◽

Hailong Yin ◽

Hao Zhang ◽

Jia Kang ◽

Yun Li ◽

...

Keyword(s):

Corrosion Rate ◽

Tensile Stress ◽

Corrosion Behavior ◽

Electrochemical Impedance ◽

Pipeline Steel ◽

Open Circuit ◽

Co2 Corrosion ◽

X80 Pipeline Steel ◽

X80 Steel ◽

Co2 Environment

An investigation into the electrochemical corrosion behavior of X80 pipeline steel under different elastic and plastic tensile stress in a CO2-saturated NaCl solution has been carried out by using open-circuit potential, potentiodynamic polarization, electrochemical impedance spectroscopy, and surface analysis techniques. The results show that the corrosion rate of X80 steel first increases and then slightly decreases with the increase of elastic tensile stress, whereas the corrosion rate sharply increases with the increase of plastic tensile stress. Both elastic and plastic tensile stress can enhance steel corrosion by improving the electrochemical activity of both anodic and cathodic reactions. Moreover, compared with elastic tensile stress, plastic tensile stress has a more significant effect. Furthermore, electrochemical reactions for CO2 corrosion and mechanoelectrochemical effect are used to reasonably explain the corrosion behavior of stressed X80 steel in CO2 environment.

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Influence of the Cathodic Charging Current on Electrochemical Behaviors of X80 Steel in an Simulated Acidic Soil Solution

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.750-752.2179 ◽

2013 ◽

Vol 750-752 ◽

pp. 2179-2182

Author(s):

Jie Zhang ◽

Jing Li ◽

Qian Hu ◽

Feng Huang

Keyword(s):

Soil Solution ◽

Electrode Surface ◽

Electrochemical Impedance ◽

Open Circuit ◽

Acidic Soil ◽

Anodic Process ◽

Electrochemical Behaviors ◽

Charging Current ◽

X80 Steel ◽

Cathodic Charging

The electrochemical behaviors of X80 steel under different charging current in an acidic soil solution were investigated by open circuit potential, potentiodynamic scan and electrochemical impedance spectroscopy. Results show that cathodic charging promotes the formation of corrosion product on the electrode surface, accordingly, the OCP changes slightly. The hydrogen ions on electrode surface are exhausted during the charging process, therefore the cathodic reaction is restrained meanwhile the anodic process iron dissolution increases. EIS result shows that the corrosion rate under OCP was inhibited by cathodic charging. However, the anodic process was enhanced by charging under-0.4 VSCE.

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Evaluation of Corrosion Protection Performance of New Polymer Composite Coatings on Carbon Steel in Acid Medium by Electrodeposition Methods

Coatings ◽

10.3390/coatings11080903 ◽

2021 ◽

Vol 11 (8) ◽

pp. 903

Author(s):

Florina Branzoi ◽

Adriana Băran ◽

Simona Petrescu

Keyword(s):

Carbon Steel ◽

Corrosion Protection ◽

Electrochemical Impedance ◽

Composite Coatings ◽

Polymeric Composite ◽

Open Circuit ◽

Molar Ratio ◽

Triton X100 ◽

Molar Ratios ◽

Current Densities

In this research, electrodeposition procedure was utilized for the synthesis of a new composite polymer: N-methylpyrrole–Triton–X100/N, N, N-diethylaniline (NMpy-TRx100/NNDEA) used as a coating on carbon steel type OL 37 electrode for corrosion protection. The surfactant Triton–X100, a dopant ion utilized throughout the process of electropolymerization, had a significant impact on the corrosion protection of this composite by impeding the penetration of corrosive ions. PNMpy-TRx100/PNNDEA coatings were successfully realized on the OL37 substrate by a galvanostatic method of synthesis using the solutions 0.1 M NNDEA, 0.1 M MPY, 0.03 M TRX-100, and 0.3 M H2C2O4, at varied current densities (3 mA/cm2, 5 mA/cm2 and 8 mA/cm2) in different molar ratios (1:1, 1:5, 3:2 and 5:1). The deposition was performed for 20 and 30 min. The polymeric composite coatings were characterized electrochemically, spectroscopically, and morphologically by cyclic voltammetry, Fourier transform infrared spectroscopy, and scanning electron microscopy methods. Corrosion protection performance of PNMpy-TRx100/PNNDEA-coated OL 37 was examined through potentiostatic and potentiodynamic polarization, open circuit potential measurements, and electrochemical impedance spectroscopy procedures in 0.5 M H2SO4 media. The corrosion rate of PNPMpy-TRx100/PNNDEA-coated OL 37 was denoted to be around nine times less than that of an uncoated electrode. The corrosion protection yield of the coating was more than 90%. The best effectiveness was realized for PNMPY-TRX-100/PNNDEA by electrodeposition at 5 mA/cm2 current density applied in molar ratios of 5:1 and 3:2, and at 8 mA/cm2 current densities applied in molar ratio 5:1. The outcomes of the corrosion experiments revealed that PNMPY-TRX-100/PNNDEA coatings provide a good anticorrosion protection of OL 37 in corrosive solutions.

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Study on the Influence of AC Stray Current on X80 Steel under Stripped Coating by Electrochemical Method

International Journal of Corrosion ◽

10.1155/2019/4372430 ◽

2019 ◽

Vol 2019 ◽

pp. 1-8 ◽

Cited By ~ 2

Author(s):

Yanyu Cui ◽

Tao Shen ◽

Qingmiao Ding

Keyword(s):

Current Density ◽

Electrochemical Method ◽

Corrosion Current Density ◽

Corrosion Current ◽

Open Circuit ◽

Stray Current ◽

Ac Power ◽

Initial Stage ◽

X80 Steel ◽

Ac Interference

The effect of AC stray current density on corrosion behavior of X80 steel with stripped coating defects was studied by electrochemical method. The experimental results showed that the open circuit potential of X80 steel was shifted negatively due to the existence of AC interference. The degree of negative shift increased with the increasing of AC stray current density. And the potential after the cut of AC interference was still more negative than before. That is, the corrosion interference continued after cutting the AC power. In the initial stage of the experiment, the corrosion current density with 30A/m2 AC stray current interference was about 1.4 times of that without AC interference, while the corrosion current density with 50A/m2 AC stray current interference was about two times of that without AC interference.

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Effect of a DC Stray Current on the Corrosion of X80 Pipeline Steel and the Cathodic Disbondment Behavior of the Protective 3PE Coating in 3.5% NaCl Solution

Coatings ◽

10.3390/coatings9010029 ◽

2019 ◽

Vol 9 (1) ◽

pp. 29 ◽

Cited By ~ 1

Author(s):

Xinhua Wang ◽

Zuquan Wang ◽

Yingchun Chen ◽

Xuting Song ◽

Yong Yang

Keyword(s):

Direct Current ◽

Current Density ◽

Pipeline Steel ◽

Three Dimensional ◽

Steel Corrosion ◽

Cathode Region ◽

Nacl Solution ◽

Stray Current ◽

X80 Pipeline Steel ◽

X80 Steel

The influence of a direct current (DC) stray current on the corrosion and cathodic disbondment of X80 steel coated with a polyethylene (3PE) coating in 3.5% NaCl solution was studied by immersion experiments, electrochemical tests, three-dimensional microscopy, and a surface analysis. The results showed that the potential of the X80 steel sample shifts under the direct current. After 100A/m2 DC interference was applied, the potential of the sample in the anode region positively shifted from –0.68 to –0.43 V. At the same time, the sample in the cathode region negatively shifted to –1.45 V. Under the DC anode action, the X80 steel corrosion exhibited no passivation and followed Faraday’s law of electrolysis, in which the corrosion rate is proportional to the current density. Three-dimensional (3D) digital microscopy showed that, as the DC current increased, the depth of the corrosion pit also increased (gradually), indicating a higher corrosion degree. The sample in the cathode region only underwent a hydrogen evolution reaction, which caused cathodic disbondment of the coating. The stray current had a critical current density for the coating disbonding: the coating delamination area reached its maximum and then remained unchanged.

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Study on the Electrochemical Performance of Sacrificial Anode Interfered by DC Stray Current

International Journal of Corrosion ◽

10.1155/2018/4728692 ◽

2018 ◽

Vol 2018 ◽

pp. 1-10

Author(s):

Qingmiao Ding ◽

Tao Shen ◽

Yanyu Cui ◽

Juan Xue

Keyword(s):

Open Circuit Potential ◽

Electrochemical Impedance ◽

Chloride Ion ◽

Open Circuit ◽

Ion Concentration ◽

Effect Of Temperature ◽

Sacrificial Anode ◽

Stray Current ◽

Anode Corrosion ◽

The Impact

The influence of sacrificial anode electrochemical properties interfered by direct stray current (DC) of 0 V, 1 V, 3 V, and 5 V, with different chloride ion concentration and temperature, was studied by open circuit potential (OCP), electrochemical impedance spectroscopy (EIS), and polarization curves. The specific performance was as follows: as the DC interference voltage increased from 0 V to 5 V, the degree of positive migration of the sacrificial anode open circuit potential increased. The effect of temperature in DC interference voltage environment on sacrificial anode corrosion was not great, but the low temperature of 10°C could slow down the sacrificial anode corrosion and maintain good work efficiency. With the increase of the ambient temperature, the degree of corrosion of the sacrificial anode was deepened. As the chloride ion concentration in DC interference voltage environment increased from 0% to 0.3%, the degree of positive migration of the sacrificial anode open circuit potential increased. The higher the chloride ion concentration was, the greater the impact on the performance of the sacrificial anode was.

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