scholarly journals Phospholipids from plant materials as a corrosion inhibitor in oil production

2021 ◽  
Vol 2094 (5) ◽  
pp. 052044
Author(s):  
E I Lesik ◽  
F A Buryukin ◽  
R A Vaganov
Keyword(s):  
Aqueous Solution ◽  
Corrosion Current Density ◽  
Electrochemical Corrosion ◽  
Steel Corrosion ◽  
Corrosion Current ◽  
Experimental Conditions ◽  
Plant Materials ◽  
Protective Properties ◽  
Acid Aqueous Solution ◽  
Corrosion Intensity

Abstract The article presents the assessment results of carbon steel corrosion rate in 15% hydrochloric acid (aqueous solution) in the presence of phospholipids at 60 °C. The corrosion intensity was estimated from the rate of weight loss; the intensity of electrochemical corrosion was determined from the value of the corrosion current density. Phospholipids were isolated from vegetable oil waste. Surfactants of various operating principles were used as samples for comparison and enhancing the additives efficiency. It was found that the use of phospholipids under experimental conditions made it possible to provide protective properties up to 86.5% for phospholipids individually and up to 95% in a 50:50 mixture with a cationic surfactant.

Effects of Voltage on the Characteristics and Corrosion Resistance of Microarc Oxidation Coatings on Ti6Al4V Alloy

2010 ◽  
Vol 97-101 ◽  
pp. 1336-1339
Author(s):  
Zong Chun Hu ◽  
Fa Qin Xie ◽  
Xiang Qing Wu
Keyword(s):  
Aqueous Solution ◽  
Corrosion Resistance ◽  
Corrosion Current Density ◽  
Turning Point ◽  
Electrochemical Impedance ◽  
Microarc Oxidation ◽  
Corrosion Current ◽  
Ceramic Coatings ◽  
Thickness Gauge ◽  
Potentiostatic Regime

Ceramic coatings were prepared on Ti6Al4V in aluminate-based electrolyte by microarc oxidation at various voltages using potentiostatic regime. The phase composition, microstructure and morphology of the coatings were characterized by eddy thickness gauge, XRD and SEM respectively. The corrosion resistance of the coatings was investigated by polarization curve and electrochemical impedance spectroscopy (EIS) in 3.5% NaCl aqueous solution. The results show that all the coatings are mainly composed of Al2TiO5. When the voltage increases from 360V to 510V, the coating thickness grows significantly, and the pores in the coatings get large and deep simultaneously. As a result, the corrosion resistance of the coatings increases first and then decreases with the turning point of 410V, at which the coating prepared shows the smallest corrosion current density of 1.965E-9 A/cm2. The coating prepared at a higher voltage before the discharges grow large and intense (410V in this work) shows the best corrosion resistance.

scholarly journals Electrochemical Corrosion Behaviour of Different Grades of WC-Co, High-Cr White Cast Irons and Hadfield Steel in 1 M Sulphuric Acid

Materials ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6130
Author(s):  
Johannes H. Potgieter ◽  
David Whitefield ◽  
Vivian Motsumi
Keyword(s):  
Current Density ◽  
Corrosion Current Density ◽  
Corrosion Behaviour ◽  
Mining Industry ◽  
Electrochemical Corrosion ◽  
Corrosion Current ◽  
Binder Content ◽  
Hadfield Steel ◽  
Cast Irons ◽  
Primary Carbides

Electrochemical polarisation tests were carried out on three grades of WC-Co cemented carbides to investigate the corrosive behaviour of the hardmetals and rank them as viable protective liners for chutes and skips in the mining industry. The cobalt binder content and WC particle size varied. The binder content ranged from 6–12 wt%, and the grain size of the WC particles ranged from 0.4–2.3 µm. The performance of the WC-Co hardmetal was compared to three different grades of high chromium white cast irons and Hadfield steel. The cast irons varied in both their chromium content and the morphology of the Cr-rich primary carbides. Potentiodynamic polarisation and linear polarization resistance scans were used to determine the corrosion current density and other electrochemical parameters. The microstructural characteristics of the samples were analysed using Scanning Electron Microscope(SEM) with Energy Dispersive Spectroscopy (EDS), and optical microscopy. The potentiodynamic scans revealed that, although the WC-Co alloys were found to have generally improved corrosion resistance, it was the high-Cr white cast iron (22 wt% Cr) that recorded the lowest corrosion current density and therefore displayed the best resistance against corrosive attack in 1 M H2SO4. The Hadfield steel exhibited the poorest resistance to corrosion and therefore, suffered the most degradation to its exposed surface.

scholarly journals Galvanic Corrosion of SA106 Gr.B Coupled with Magnetite in Alkaline Solution at Various Temperatures

Materials ◽  
2019 ◽  
Vol 12 (4) ◽  
pp. 628
Author(s):  
Soon-Hyeok Jeon ◽  
Geun Song ◽  
Sang Kim ◽  
Do Hur
Keyword(s):  
Current Density ◽  
Corrosion Current Density ◽  
Corrosion Potential ◽  
Galvanic Corrosion ◽  
Electrochemical Corrosion ◽  
Corrosion Current ◽  
Area Ratio ◽  
Manganese Steel ◽  
Effect Of Temperature ◽  
Reductive Dissolution

The effect of temperature on the galvanic corrosion behavior of SA106 Gr.B carbon-manganese steel was studied in an alkaline aqueous solution at various temperatures (30, 60, and 90 °C) via electrochemical corrosion tests. At all temperatures studied, carbon-manganese steel acted as the anode of the galvanic cell composed of carbon-manganese steel and magnetite because the corrosion potential of carbon-manganese steel was significantly lower than that of magnetite. The corrosion current density of carbon-manganese steel significantly increased due to the galvanic effect irrespective of temperature used in this study. With the increase in temperature, the extent of the galvanic effect on the corrosion current density of carbon-manganese steel and reductive dissolution of magnetite gradually increased. When the area ratio of magnetite to carbon-manganese steel increased, the corrosion rate of the carbon-manganese steel in contact with magnetite further increased.

Electrochemical Corrosion Behavior of Iron Aluminides in Sulfuric Acid

2020 ◽  
Vol 1012 ◽  
pp. 395-400
Author(s):  
Pedro Paiva Brito ◽  
Carlos Trivellato de Carvalho Filho ◽  
Gabriela de Andrade Oliveira
Keyword(s):  
Current Density ◽  
Corrosion Current Density ◽  
Electrochemical Impedance ◽  
Electrochemical Corrosion ◽  
Corrosion Current ◽  
Passive Behavior ◽  
Corrosion Evaluation ◽  
Electrochemical Corrosion Behavior ◽  
Work Samples ◽  
Passive Current

In the present work, samples of a binary intermetallic alloy (Fe3Al) with 26at.%Al were submitted to electrochemical corrosion evaluation in a 0.5M H2SO4 solution containing naturally dissolved oxygen. The corrosion resistance was evaluated by applying linear polarization, electrochemical impedance spectroscopy and potentiodynamic polarization at 22 and 35°C. The results obtained revealed that in both conditions the material exhibits active-passive behavior. Heating to 35°C did not alter the passivity characteristics of the alloy (passivation range and passive current density), but elevated the corrosion current density and the critical current density. The polarization resistance of the samples was also decreased with temperature, following the trend observed for the corrosion current density.

scholarly journals The Corrosion Resistance of Graphene-Modified Oily Epoxy Coating on AZ31 Magnesium Alloys

2021 ◽  
Vol 8 ◽  
Author(s):  
Zhengyuan Gao ◽  
Chengjin Sun ◽  
Lianteng Du ◽  
Dong Yang ◽  
Xiang Zhang ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Epoxy Resin ◽  
Current Density ◽  
Corrosion Current Density ◽  
Surface Defects ◽  
Electrochemical Corrosion ◽  
Corrosion Current ◽  
Corrosive Media ◽  
Electrochemical Testing

In order to enhance the corrosion resistance of AZ31 magnesium alloy, graphene-modified oily epoxy resin coating (G/OEP) were prepared on the surface of magnesium alloy. SEM observations show that graphene has fewer surface defects, and can significantly improve the surface quality of the coating and reduce defects. FI-TR testing shows that coating are mainly composed of epoxy resin (polyurethane) and its corresponding curing agent. Electrochemical testing shows that the coating can provide good corrosion protection for magnesium alloy. Compared with the corrosion current density of magnesium alloy of 6.20 × 10−7 A/cm2, the G/OEP can significantly reduce the corrosion current density to 6.96 × 10−12 A/cm2. Analysis of the morphology of the coating after electrochemical corrosion found that graphene can improve the shielding ability of the coating to corrosive media, and reduce the damage of corrosion to the coating structure, and enhance the corrosion resistance of the coating. The content of graphene for excellent corrosion resistance of coating during this experiment is 0.6 wt%. The graphene can fill the defects generally in the coating during the curing process to prevent substrate from penetration of corrosive media caused by the density and hydrophobicity of coating are increased.

scholarly journals The role of β(Al12Mg17) phase on corrosion behavior of the AZ91 alloy in NaCl aqueous solution

2017 ◽  
Vol 62 (1) ◽  
pp. 155-158 ◽  
Author(s):  
M. Hatakeyama ◽  
K. Shimono ◽  
D. Iwashima ◽  
S. Saikawa ◽  
S. Sunada
Keyword(s):  
Aqueous Solution ◽  
Current Density ◽  
Corrosion Current Density ◽  
Isothermal Annealing ◽  
Corrosion Current ◽  
Az91 Alloy ◽  
Nacl Solution ◽  
Β Phase ◽  
Α Phase

AbstractThe effect of the β phase (Al12Mg17) on the corrosion resistance in a NaCl solution was investigated by electro chemical methods.Volume fraction of β phase in each specimen was controlled systematically by isothermal annealing at 473 K as 0%, 4%, 22% and 100 %, respectively. Although α phase shows lower corrosion current density than that of β phase, the α/β mixed phase specimen showed higher corrosion current density than that of α phase.It strongly suggests that β phase act as cathodic electrode in the alloys.

Mechanism of Steel Corrosion Inhibition Using Mannich Bases

2009 ◽  
Vol 79-82 ◽  
pp. 1963-1966
Author(s):  
Cristina Bogatu ◽  
Ileana Manciulea ◽  
Anca Duta
Keyword(s):  
Potentiodynamic Polarization ◽  
Corrosion Current Density ◽  
Corrosion Inhibitors ◽  
Steel Corrosion ◽  
Corrosion Current ◽  
Mannich Bases ◽  
Saline Environment ◽  
Different Types ◽  
Protection Mechanisms ◽  
Polarization Studies

The paper presents the results obtained when using Mannich bases (and derivatives) as corrosion inhibitors in saline environment, for different types of steels, with various alloying elements. The Mannich basis (ketonic combinations with naphtenic and nitrogen containing rings) were synthesized as such (polar) and as chlorhydrates (ionic) and used in corrosion experiments, in concentrations varying from 0….1300 ppm. The corrosion experiments were performed by potentiodynamic polarization studies. Based on the polarization curves, the corrosion current density and rate were calculated. The inhibitor efficiency was evaluated and based on these values the protection mechanisms was discussed.

scholarly journals Prediction Model of Corrosion Current Density Induced by Stray Current Based on QPSO-Driven Neural Network

Complexity ◽  
2019 ◽  
Vol 2019 ◽  
pp. 1-15 ◽  
Author(s):  
Chengtao Wang ◽  
Wei Li ◽  
Gaifang Xin ◽  
Yuqiao Wang ◽  
Shaoyi Xu
Keyword(s):  
Neural Network ◽  
Particle Swarm Optimization ◽  
Current Density ◽  
Corrosion Current Density ◽  
Learning Algorithm ◽  
Particle Swarm ◽  
Electrochemical Corrosion ◽  
Corrosion Current ◽  
Stray Current ◽  
Swarm Optimization

The buried pipelines and metallic structures in subway systems are subjected to electrochemical corrosion under the stray current interference. The corrosion current density determines the degree and the speed of stray current corrosion. A method combining electrochemical experiment with the machine learning algorithm was utilized in this research to study the corrosion current density under the coupling action of stray current and chloride ion. In this study, a quantum particle swarm optimization-neural network (QPSO-NN) model was built up to predict the corrosion current density in the process of stray current corrosion. The QPSO algorithm was employed to optimize the updating process of weights and biases in the artificial neural network (ANN). The results show that the accuracy of the proposed QPSO-NN model is better than the model based on backpropagation neural network (BPNN) and particle swarm optimization-neural network (PSO-NN). The accuracy distribution of the QPSO-NN model is more stable than that of the BPNN model and the PSO-NN model. The presented model can be used for the prediction of corrosion current density and provides the possibility to monitor the stray current corrosion in subway system through an intelligent learning algorithm.

scholarly journals An electrochemical method to investigate the effects of compound composition on gold dissolution in thiosulfate solution

2020 ◽  
Vol 9 (1) ◽  
pp. 496-502 ◽  
Author(s):  
Zhaohui Zhang ◽  
Bailong Liu ◽  
Mei Wu ◽  
Longxin Sun
Keyword(s):  
Dissolution Rate ◽  
Current Density ◽  
Polarization Resistance ◽  
Electrochemical Method ◽  
Corrosion Current Density ◽  
Corrosion Potential ◽  
Corrosion Current ◽  
Gold Dissolution ◽  
Tafel Polarization ◽  
Edta Solution

AbstractThe electrochemical behavior of gold dissolution in the Cu2+–NH3–S2O32−–EDTA solution has been investigated in detail by deriving and analyzing the Tafel polarization curve, as this method is currently widely implemented for the electrode corrosion analysis. The dissolution rate of gold in Cu2+–NH3–S2O32−–EDTA solution was determined based on the Tafel polarization curves, and the effects of various compound compositions in a Cu2+–NH3–S2O32−–EDTA mixture on the corrosion potential and corrosion current density were analyzed. The results showed that the corrosion potential and polarization resistance decreased, whereas the corrosion current density increased for certain concentrations of S2O32−–NH3–Cu2+ and EDTA, indicating that the dissolution rate of gold had changed. The reason for promoting the dissolution of gold is also discussed.

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