Role of Asphaltenes in Inhibiting Corrosion and Altering the Wettability of the Steel Surface

CORROSION ◽  
2011 ◽  
Vol 67 (10) ◽  
pp. 105006-105006-11 ◽  
Author(s):  
P. Ajmera ◽  
W. Robbins ◽  
S. Richter ◽  
S. Nešić
Keyword(s):  
Carbon Steel ◽  
Steel Surface ◽  
Protective Layer ◽  
Contact Angles ◽  
Co2 Corrosion ◽  
Water Contact ◽  
Internal Corrosion ◽  
Corrosion Rates ◽  
Mechanism Of Inhibition ◽  
Carbon Dioxide Co2

Abstract Asphaltenes (heptane insolubles) from a variety of crude oils have been identified previously as contributors to inhibition of internal corrosion of mild steel pipelines. However, the mechanism of inhibition is unknown. To explore the mechanism, carbon dioxide (CO2) corrosion rates and wettability (oil/water contact angles) have been measured using Arab Heavy crude oil and its asphaltenes. Inhibition of CO2 corrosion rates for carbon steel was measured using electrochemical methods in a glass cell; wettability was assessed using contact angle measurements in a multiphase goniometer. The phase behavior of asphaltenes in corrosion and wetting was evaluated in the crude, toluene (C7H8), or heptol (70:30 mixture of heptane [C7H16] and toluene). Inhibition on steel exposed to a hydrocarbon phase increased with the concentration of asphaltenes in toluene. Inhibition by asphaltenes dissolved in toluene appears to be more effective than in the whole crude, at equivalent concentrations of asphaltenes. At 5 wt% in toluene, asphaltenes form a strong protective layer on the carbon steel surface, which reduces the corrosion rate and makes the surface hydrophobic. When the solubility of the oil is altered to the point where asphaltenes start to flocculate, it enhances the corrosion inhibition greatly. However, the inhibition is not as persistent as for the fully dissolved asphaltenes, and the surface needs to be periodically wetted with the oil phase to maintain the protection.

A Laboratory Corrosion Inhibition Study of Carbon Steel Using 2-Mercaptobenzothiazole (MBT) under Post-combustion CO2 Capture Conditions

CORROSION ◽  
10.5006/3663 ◽  
2021 ◽  
Author(s):  
Wei Li ◽  
James Landon ◽  
Dali Qian ◽  
Kunlei Liu
Keyword(s):  
Carbon Steel ◽  
Corrosion Inhibition ◽  
Co2 Capture ◽  
Carbon Steels ◽  
Inhibition Mechanism ◽  
Low Carbon ◽  
Inhibition Study ◽  
Corrosion Rates ◽  
Organic Corrosion Inhibitor ◽  
Carbon Dioxide Co2

Corrosion mitigation is an important aspect of amine-based post-combustion carbon dioxide (CO2) capture operations due to the desire to use less expensive but corrosion-vulnerable materials such as low carbon steels in the construction of a capture system. In this study, the corrosion behavior of A106 (grade B) carbon steel with an in-house proprietary amine-based solvent was investigated in a laboratory environment at 80 °C using an organic corrosion inhibitor, 2 Mercaptobenzothiazole (MBT). The corrosion inhibition mechanism was interpreted by electrochemical methods and surface analyses. The results revealed that the corrosion rates of carbon steel were significantly retarded using MBT. The critical inhibitor concentration was determined to be lie between 10 to 50 ppm under the tested conditions.

scholarly journals Inhibitory Properties of Neomycin Thin Film Formed on Carbon Steel in Sulfuric Acid Solution. Electrochemical and AFM Investigation

2017 ◽  
Author(s):  
Adriana Samide ◽  
Gabriela Eugenia Iacobescu ◽  
Bogdan Tutunaru ◽  
Roxana Grecu ◽  
Cristian Tigae ◽  
...  
Keyword(s):  
Atomic Force Microscopy ◽  
Sulfuric Acid ◽  
Carbon Steel ◽  
Acid Solution ◽  
Sulfuric Acid Solution ◽  
Steel Surface ◽  
Protective Layer ◽  
Force Microscopy ◽  
Atomic Force ◽  
Neomycin Sulfate

Our study aims to implement a strategy to reduce the carbon steel corrosion rate in sulfuric acid solution, using an expired drug with adsorption affinity on the metal surface. To investigate the corrosion protection efficiency of an environmental friendly inhibitor, namely neomycin sulfate (NMS), the electrochemical measurements were applied on carbon steel immersed in 1.0 M H2SO4 solution with and without NMS. The protective layer formed on the steel surface was studied by atomic force microscopy (AFM). The potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) showed that the presence of the neomycin sulfate in acid solution leads to the decrease in corrosion current density (icorr) and the increase of polarization resistance (Rp). The mixed mechanism between physical and chemical adsorption of NMS molecules on the steel surface was proposed according to the Langmuir adsorption isotherm. The Atomic Force Microscopy (AFM) indicated that the NMS molecules contributed to a protective layer formation by their adsorption on the steel surface. The AFM parameters such as: root-mean-square roughness (Rq); average roughness (Ra) and maximum peak to valley height (Rp-v) revealed that in the presence of NMS a smoother surface of carbon steel was obtained, compared to the steel surface corroded in sulfuric acid blank solution.

scholarly journals Mechanism and inhibition efficiency of biomass Tetraselmis chuii sp. on carbon steel corrosion in the environment under the conditions of oil wells

Al-Kimia ◽  
2020 ◽  
Vol 8 (1) ◽  
Author(s):  
Yayan - Sunarya ◽  
Heli Siti H ◽  
Munawaroh Munawaroh ◽  
Gun Gun Gumilar
Keyword(s):  
Carbon Steel ◽  
Corrosion Inhibitors ◽  
Inhibition Efficiency ◽  
Protective Layer ◽  
Steel Corrosion ◽  
Marine Microorganisms ◽  
Tetraselmis Chuii ◽  
Mechanism Of Inhibition ◽  
Biomass Extract ◽  
Inhibition Ability

Corrosion control on petroleum pipe wells can only be done through the addition of corrosion inhibitors. In this study, the corrosion inhibitors studied were sourced from marine microorganisms, namely the type of microalgae Tetraselmis chuii sp. The aim to be achieved in this study was to determine the mechanism and efficiency of inhibition of the extraction of microalgae biomass in corrosion of carbon steel in an environment of petroleum conditions. To achieve this goal, a potentiodynamic polarization method (Tafel extrapolation) was used and the Electrochemistry Impedance Spectroscopy (EIS) method used the galvanostat-potentiostat device (Voltalab 40, PGZ 301). The results obtained from this study indicate that API 5L X65 carbon steel in the petroleum environment is very significantly corroded, caused by acidic media derived from acetic acid and dissolved CO2. The inhibition ability of the Tetraselmis chuii sp. Biomass extract. in line with the increasing extraction concentration reaching optimum at a concentration of 250 ppm with inhibition efficiency reaching 70%. The mechanism of inhibition takes place through the formation of a protective layer adsorbed on the surface of carbon steel. The protective membrane formed is uneven and tends to be porous.

scholarly journals Corrosion Rate of Carbon Steel A106 Gr B in Amine-CO2 Contained Solutions

2021 ◽  
Vol 3 (1) ◽  
pp. 1-8
Author(s):  
Yuli Asmara ◽  
Tedi Kurniawan ◽  
Kushendarsyah Saptaji
Keyword(s):  
Carbon Steel ◽  
Corrosion Rate ◽  
Oil And Gas ◽  
Caustic Solution ◽  
Co2 Corrosion ◽  
Co2 Gas ◽  
Linear Polarization Resistance ◽  
Reduce Risk ◽  
Carbon Dioxide Co2 ◽  
Static Conditions

Carbon dioxide (CO2) is one of the corrosive element which exists in oil and gas industries. To prevent CO2 corrosion on carbon steel pipelines, amine-base solvent and caustic solutions are commonly applied. Accordingly, effectiveness of amine base solvent and caustic solutions to reduce risk of corrosion becomes key parameters in determining service lifetime of pipelines made of carbon steel. In this research, the corrosion rate of carbon steel A106 Gr B in amine solutions combined with saturated CO2 gas and caustic solution was studied. The experiments were carried out in static conditions and the Linear Polarization Resistance (LPR) technique was used to measure the corrosion rate (as per ASTM G 5-94). It was found that the corrosion rate in the amine-based solution had shown remarkable results. Somehow, the corrosion rate in an amine-based solvent containing saturated CO2 gas has increased to 200%. The temperature increment to 50°C from room temperature has also increased the corrosion rate. Meanwhile, the caustic addition in amine solution has reduced the corrosion rate of carbon steel.

scholarly journals An Investigation of Internal Corrosion of Oil and Gas Transporting Carbon Steel Pipes in the Niger Delta Area of Nigeria

2017 ◽  
Vol 2 (8) ◽  
pp. 22
Author(s):  
Obotowo W. Obot ◽  
Charles N. Anyakwo
Keyword(s):  
Carbon Steel ◽  
Niger Delta ◽  
Oil And Gas ◽  
Co2 Corrosion ◽  
Corrosion Monitoring ◽  
Temperature Oxidation ◽  
Internal Corrosion ◽  
Delta Area ◽  
Steel Pipes ◽  
Corrosion Mechanisms

Internal corrosion of carbon steel pipes of oil and gas Companies in the Niger Delta area of Nigeria using coupons and ER probes is presented. Corrosion mechanisms for the lines vary with the fluid type and operational parameters. Aqueous corrosion with, in some cases CO2 corrosion additive, erosion corrosion and elevated temperature oxidation are corrosion mechanisms implicated in the pipes. No H2S-induced corrosion was observed for all the lines investigated. They act separately or synergistically to exacerbate the corrosion attack.  Application of inhibitors of the amine group drastically lowered the corrosion rates. Effective inhibition regime had in an instance markedly lowered the corrosion rate of a line from 42.7080mpy to 1.3447mpy. The ER probes incorporation offered a comparative corrosion monitoring alternative and provided insight into the real time conditions of the lines over prolonged periods of times. The exercise proved very useful in determining the corrosion status of the pipes and helped to determine the lines that should require immediate maintenance intervention to obviate possible ugly incidents of breakouts and ruptures.

scholarly journals Inhibitory Properties of Neomycin Thin Film Formed on Carbon Steel in Sulfuric Acid Solution. Electrochemical and AFM Investigation

2017 ◽  
Author(s):  
Adriana Samide ◽  
Gabriela Eugenia Iacobescu ◽  
Bogdan Tutunaru ◽  
Roxana Grecu ◽  
Cristian Tigae ◽  
...  
Keyword(s):  
Atomic Force Microscopy ◽  
Sulfuric Acid ◽  
Carbon Steel ◽  
Acid Solution ◽  
Sulfuric Acid Solution ◽  
Steel Surface ◽  
Protective Layer ◽  
Force Microscopy ◽  
Atomic Force ◽  
Neomycin Sulfate

Our study aims to implement a strategy to reduce the carbon steel corrosion rate in sulfuric acid solution, using an expired drug with adsorption affinity on the metal surface. To investigate the corrosion protection efficiency of an environmental friendly inhibitor, namely neomycin sulfate (NMS), the electrochemical measurements were applied on carbon steel immersed in 1.0 M H2SO4 solution with and without NMS. The protective layer formed on the steel surface was studied by atomic force microscopy (AFM). The potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) showed that the presence of the neomycin sulfate in acid solution leads to the decrease in corrosion current density (icorr) and the increase of polarization resistance (Rp). The mixed mechanism between physical and chemical adsorption of NMS molecules on the steel surface was proposed according to the Langmuir adsorption isotherm. The Atomic Force Microscopy (AFM) indicated that the NMS molecules contributed to a protective layer formation by their adsorption on the steel surface. The AFM parameters such as: root-mean-square roughness (Rq); average roughness (Ra) and maximum peak to valley height (Rp-v) revealed that in the presence of NMS a smoother surface of carbon steel was obtained, compared to the steel surface corroded in sulfuric acid blank solution.

scholarly journals Effect of 6-Aminohexanoic Acid Released from Its Aluminum Tri-Polyphosphate Intercalate (ATP-6-AHA) on the Corrosion Protection Mechanism of Steel in 3.5% Sodium Chloride Solution

2021 ◽  
Vol 2 (4) ◽  
pp. 666-677
Author(s):  
Chaymae Hejjaj ◽  
Ahmed Ait Aghzzaf ◽  
Nico Scharnagl ◽  
Mohammed Makha ◽  
Mouad Dahbi ◽  
...  
Keyword(s):  
Sodium Chloride ◽  
Carbon Steel ◽  
Photoelectron Spectroscopy ◽  
Surface Characterization ◽  
Steel Surface ◽  
Electrochemical Impedance ◽  
Low Carbon Steel ◽  
Protective Layer ◽  
Low Carbon ◽  
X Ray

A new corrosion inhibitor called ATP-6-AHA was elaborated, and its inhibition action on S235 low carbon steel in 3.5% sodium chloride (NaCl) was investigated using gravimetry, potentiodynamic polarization (PP), and electrochemical impedance spectroscopy (EIS). The release of ecofriendly 6-aminohexanoic acid (6-AHA) from its established aluminum tri-polyphosphate intercalate (ATP-6-AHA) is investigated using electrochemical and surface characterization techniques such as X-ray diffraction (XRD) and X-ray fluorescence (XRF). The results revealed that ATP-6-AHA is a good inhibitor, with an inhibition efficiency of approximately 70%. The efficiency is related to the passivation of a steel surface by a phosphate protective layer due to the synergistic effect of 6-AHA, as confirmed by a steel surface analysis conducted using X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). This study suggests that the intercalation of 6-AHA as a sustainable organic molecule within the interlayer spaces of aluminum tri-polyphosphate can well serve as a good flaky inhibitor for protecting S235 low-carbon steel from corrosion in 3.5% NaCl.

Conjoint Action of CO2 Corrosion and Reciprocating Sliding Wear on Plain Carbon Steel Part II — Electrochemical Studies

CORROSION ◽  
1992 ◽  
Vol 48 (12) ◽  
pp. 1027-1031 ◽  
Author(s):  
A. Hedayat ◽  
J. Postlethwaite ◽  
S. Yannacopoulos
Keyword(s):  
Carbon Steel ◽  
Wear Rate ◽  
Corrosion Inhibitor ◽  
Contact Pressure ◽  
Sliding Wear ◽  
Plain Carbon Steel ◽  
Sliding Contact ◽  
Metal Loss ◽  
Co2 Corrosion ◽  
Corrosion Rates

Abstract The presence of sliding contact between metals in a corrosive medium significantly affects the metal loss rate of the surfaces in contact. In this study, corrosion tests were carried out on plain carbon steel undergoing sliding wear in CO2 saturated 3%NaCl solution with and without an amine corrosion inhibitor. Corrosion rates of the sliding surfaces were estimated using the polarization resistance technique. Sliding wear tests were carried out using steel specimens sliding against each other and steel specimens sliding against corundum specimens both continuously and intermittently. The corrosion rates of the specimens increased with the increase in contact pressure in the presence and absence of the corrosion inhibitor. The inhibitor decreased the corrosion rates for all of the specimens throughout the range of applied contact pressure. The corrosion rates of the specimens subjected to continuous sliding contact were higher than those undergoing intermittent sliding contact. The wear rate of a continuously sliding specimen in the absence of corrosion was determined by the application of cathodic protection and compared to the corrosion rate and the corrosion wear rate under the same loading conditions. The relative contributions of corrosion and wear to the overall metal loss are discussed.

scholarly journals Super-Hydrophobic Co–Ni Coating with High Abrasion Resistance Prepared by Electrodeposition

Coatings ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 232 ◽  
Author(s):  
Yanpeng Xue ◽  
Shuqiang Wang ◽  
Peng Bi ◽  
Guochen Zhao ◽  
Ying Jin
Keyword(s):  
Carbon Steel ◽  
Steel Substrate ◽  
Low Cost ◽  
Applied Pressure ◽  
Cobalt Content ◽  
Contact Angles ◽  
Water Contact ◽  
Practical Utilization ◽  
Electrochemical Tests ◽  
Hydrophobic Coating

Although super-hydrophobic surfaces have great application prospects in industry, their preparation cost and mechanical durability have limited their practical utilization. In this work, we presented a new low-cost process preparation for super-hydrophobic Co–Ni coating on carbon steel substrate via an electrodeposition route. The deposited Co–Ni coating with cauliflower-shaped micro-nano structures exhibited high super-hydrophobic properties with water contact angles over 161° after modification with 1H,1H,2H,2H-Perfluorooctyltrichlorosilane (PFTEOS). Evaluated by the linear abrasion methods, the super-hydrophobic coating can maintain super-hydrophobicity after abrasion distance of 12 m under the applied pressure of 5 kPa, which was attributed to the high cobalt content of the Co–Ni coating. Moreover, electrochemical tests showed that the super-hydrophobic Co–Ni coatings exhibited a good anti-corrosion performance thus providing an adequate protection to the carbon steel substrates.

scholarly journals The Effect of Hydroxyl on the Superhydrophobicity of Dodecyl Methacrylate (LMA) Coated Fabrics through Simple Dipping-Plasma Crosslinked Method

Coatings ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1263
Author(s):  
Liyun Xu ◽  
Yu Zhang ◽  
Ying Guo ◽  
Ruiyun Zhang ◽  
Jianjun Shi ◽  
...  
Keyword(s):  
Thermoplastic Polyurethane ◽  
Hydrophobic Effect ◽  
Surface Hydrophobicity ◽  
Contact Angles ◽  
Binding Property ◽  
Interesting Phenomenon ◽  
Water Contact ◽  
Capacitively Coupled ◽  
Pet Fabric ◽  
Dodecyl Methacrylate

In order to obtain stable superhydrophobicity, suitable hydrophobic treatment agents should be selected according to different material properties. In this paper, cotton and poly(ethylene terephthalate) (PET) fabrics were respectively coated with dodecyl methacrylate (LMA) via argon combined capacitively coupled plasma (CCP), and the surface hydrophobicity and durability of the treated cotton and polyester fabrics are also discussed. An interesting phenomenon happened, whereby the LMA-coated cotton fabric (Cotton-g-LMA) had better water repelling and mechanical durability properties than LMA-coated PET fabric (PET-g-LMA), and LMA-coated hydroxyl-grafted PET fabrics (PET fabrics were successively coated with polyethylene glycol (PEG) and LMA, PET-g-PEG & LMA) had a similar performance to cotton fabrics. The water contact angles of Cotton-g-LMA, PET-g-LMA and PET-g-PEG & LMA were 156°, 153° and 155°, respectively, and after 45 washing cycles or 1000 rubbing cycles, the corresponding water contact angles decreased to 145°, 88°, 134° and 146°, 127° and 143°, respectively. Additionally, thermoplastic polyurethane (TPU) and polyamides-6 (PA6) fabrics all exhibited the same properties as the PET fabric. Therefore, the grafting of hydroxyl can improve the hydrophobic effect of LMA coating and the binding property between LMA and fabrics effectively, without changing the wearing comfort.

Sign in / Sign up

Export Citation Format

Share Document