Corrosion Protection of Carbon Steel Oil Pipelines by Unsaturated Polyester/Clay Composite coating (original) (raw)
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Journal of physics, 2018
In order to inhibit the metallic corrosion in the oil pipelines,the protection method with composite coating of Unsaturated polyester and reinforced by Caolin at weight percentage (20%) was studied .where, the work samples were classified into two groups according to internal composite coatings layers for all group of these samples.The first group is nitrocellulose coating reinforced by nano and Micro Powder of Mgo ,The Second group is sodium silicate coating reinforced by nano powder of Mgo ,The following weight percentages (0%,1%,3% and5%) were adopted as reinforcement ratios for nano powders,as well as the weight percentages (0%,3%,5% and7%) as reinforcement ratios for micro powders Tribology properties and Electrochemical Corrosion Resistance by Polarization method (Tafel) and Adhesion Strength were studied, The results showed an improvement in the corrosion resistance of protected steel by coatings compare with uncoated steel, As well as improvement in mechanical properties and adhesion strength of composite coatings.
Sol-Gel / Dip Coating Technique for Corrosion Protection of Petroleum Pipeline Steel
Journal of Advanced Engineering Trends
In the oil, gas and petrochemical industries the greatest costs are those associated with material failures due directly to corrosive-erosive degradation of surfaces and components of the pipelines. These results in the frequent repair and replacement of parts which accrues costs associated with loss in revenues in downtime and maintenance [1]. In the current study, a dip-coating method was exploited to provide a coating layer of epoxy resin on 316L and 304 stainless steel plate. Epoxy resin was converted to cationic tertiary type amine resin. This cationic epoxy resin, which contains ammonium group in the end of the polymer chain, was synthesized by ring-opening reaction of an epoxy resin with secondary amine in the presence of a proton donor. A layer of resin was successfully deposited on the stainless steel plates and physical properties of the layer were assessed. A detailed study aiming to obtain reliable information of coating properties was carried out. The electrochemical corrosion results showed that epoxy layer has a positive behavior on protections of stainless steels alloys at the early degradation time point. Scanning electron microscopy observation was also used to study the surface morphology before and after coating. Tafel extrapolation method and Tafel slope constants were used to calculate the polarization resistance.
Materials (Basel, Switzerland), 2018
Coating is one of the most effective measures to protect metallic materials from corrosion. Various types of coatings such as metallic, ceramic and polymer coatings have been investigated in a quest to find durable coatings to resist electrochemical decay of metals in industrial applications. Many polymeric composite coatings have proved to be resistant against aggressive environments. Two major applications of ferrous materials are in marine environments and in the oil and gas industry. Knowing the corroding behavior of ferrous-based materials during exposure to these aggressive applications, an effort has been made to protect the material by using polymeric and ceramic-based coatings reinforced with nano materials. Uncoated and coated cast iron pipeline material was investigated during corrosion resistance by employing EIS (electrochemical impedance spectroscopy) and electrochemical DC corrosion testing using the "three electrode system". Cast iron pipeline samples were ...
Metallurgical and Materials Engineering, 2020
The use of agricultural wastes, which are cost-effective and environmentalfriendly materials as composites coating, is growing fast in various engineering fields. This research investigates the possibility of improving corrosion resistance, mechanical, and wear behaviors of particulate composite coating of steel pipeline with zinc alloys reinforced with groundnut shell ash (GSA) for the marine environment. Different weight percentages of 5, 10, 15, 20, and 25 wt.% GSA of particle size 75 μm were used for the coatings. The groundnut shell ash was characterized by X-ray fluorescent (XRF). The morphology of the steel pipeline before and after coatings was studied using scanning electron microscope/Energy Dispersive Spectroscopy (SEM/EDS). The XRF results revealed that calcium oxides (CaO), silica (SiO2), alumina (Al2O3), and iron oxide (Fe2O3) being the major oxides present. The results showed that average coating thickness and hardness value were 45.50, 98.50, 99.67 μm, and 80.45, 108.60, 118.60 HBV for Zn-10ZnO/0, 20, and 25 wt. % GSA respectively. Their corresponding current corrosion (icorr) were 38.52, 10.56, and 2.98 mA/cm 2 . The morphologies revealed that reinforcement with GSA protected the surface of the system analyzed. The corrosion rate of the steel pipeline of 38.52 mA/cm 2 values decreased to 10.56 mA/cm 2 and 1.98 mA/cm 2 for 0, 20, and 25 wt. % GSA with the protection efficiency of 72.59% and 81.25%, respectively. The wear rate improvement between 0-25 wt. % GSA was 49.75%. The work established Zn-10ZnO/GSA composite coating on steel pipeline can improve the corrosion resistance, hardness, and wear rate of the studied steel pipeline coated.
A Novel Anti-Corrosion Pipeline Coating Solution
2014
A novel composite polymeric pipeline coating solution based on a FBE base coat and an outer layer of reinforced polyolefin is presented. Compared with DLFBE, the new coating is a much better moisture barrier and has higher corrosion resistance, with higher flexibility. At half the thickness of a 3LPE, the new coating provides similar corrosion and impact resistance but being more flexible yet harder, more abrasion resistant, less shrinkage, and more difficult to peel, while offering unsurpassed field joint adherence properties and extended operating temperature range to 100C. The paper compares the performance properties of the new pipeline coating system with conventional DLFBE and 3LPE systems, accordance with AS/NZS 3862, CSA Z245.20/21, and ISO 21809-1 standards. A case history of an actual pipeline project is also presented.
STUDY OF CORROSION BEHAVIOUR OF COAL TAR POLYMERS COATED SYSTEM IN DIFFERENT CORROSIVE ENVIRONMENTS
iaeme
This thesis proposes a methodology for predicting the corrosion behaviour of uncoated steel & different polymer-organic coated steel (coal tar enamel, coal tar epoxy and coal tar tape) in Tap and Saline water. Corrosion properties were measured by Gamry Instrument. The ICORR & ECORR values are calculated by using Gamry Echem Software. The experimental measurement value used the Linear Polarization and Tofel Extrapolation curve techniques for determining the corrosion rate. Comparison of corrosion resistance among the coated samples reveal a few interesting observations. Coal tar epoxy coated sample shows better corrosion resistance than the other different coated sample in different environment. From LPR test Rp values were also obtained. Higher Rp values indicate good coating property
Development of Corrosion Resistance Coatings for Sea Water Pipeline
International Journal of Students' Research in Technology & Management
The pipelines that are used for transporting sea water to desalination plants are made of expensive steel alloys. However because of the salt content in water and also other atmospheric factors this pipe undergoes severe corrosion problem. This causes pits and holes in pipe surface making it useless and lead to huge replacement cost of pipes. Hence a way to control corrosion is needed.In this project use of different coatings to overcome corrosion is tested experimentally. Five types of coatings namely epoxy, aluminum, enamel, rubber, and chrome are coated on the samples prepared from actual pipeline used in the plant and the experimental results and analysis are summarized for finding the best coating for reducing corrosion of pipes. Among the five different coatings tested the rubber and epoxy coatings resulted with minimum corrosion rate and weight loss.
Journal of Adhesion Science and Technology, 2018
In this paper, electropolymerization technique has been used for the obtained of new composite: polypyrrole-dioctyl sulfosuccinate sodium/poly N-ethylaniline (PPY-AOT/PNEA) coatings over carbon steel of type OLC 45 electrode for anticorrosion protection. The PPY-AOT/ PNEA coatings were successfully synthesized onto OLC 45 electrode by galvanostatic deposition from aqueous solutions 0.1 M NEA, 0.1 M PY, 0.01 M AOT and 0.3 M H 2 C 2 O 4 solution at different current densities (5, 3 and 1 mA/cm 2) in different molar ratio. The anionic surfactant (AOT) as a dopant ion used during electropolymerization can have a significant result on the anticorrosion protection of the composite film by hindering the penetration of aggressive ions. The polymeric composite coatings have been analyzed by cyclic voltammetry (CV), Fourier transform infrared (FT-IR) spectroscopy and scanning electron microscopy (SEM) methods. The corrosion resistance of PPY-AOT/PNEA coated carbon steel has been examined by potentiodynamic polarization techniques and electrochemical impedance spectroscopy (EIS) methods in 0.5 M H 2 SO 4 solutions. The data of the corrosion samples demonstrated that PPY-AOT/PNEA coatings assure a great anticorrosion protection of OLC 45 electrode in corrosive media. The corrosion rate of PPY-AOT/PNEA coated OLC 45 has been indicated to be ~9 times lower than of uncoated electrode. The corrosion protection effectiveness of the composite coating is more than 89%. The best efficiency is accomplished of PPY-AOT/PNEA obtained by electrodeposition at 5 mA/cm 2 current densities applied in molar ratio 5:1.
Ceramics International, 2016
Carbon steel is the most commonly used material in the petroleum industry owing to its high performance and relatively low cost compared with highly alloyed materials. The corrosion resistance of carbon steel in aqueous solutions is dependent on the surface layer created on carbon steel. This layer often consists of siderite (FeCO 3) and cementite (Fe 3 C), but it is neither compact nor dense. To improve the carbon steel surface resistance against corrosion and wear, a compact and dense layer can be deposited onto the surface by thermal spray coating. In this research, Al 2 O 3-40TiO 2 and Cr 3 C 2-20NiCr were deposited onto mechanical part surfaces by HVOF spray technique. The present study describes and compares the electrochemical behavior of carbon steel, Cr 3 C 2-20NiCr and Al 2 O 3-40TiO 2 in 3.5% NaCl using open-circuit potential measurement (OCP) and electrochemical impedance microscopy (EIS) for 36 days. The tribological and mechanical properties are also investigated using a tribometer (pin-on-disc). The results indicate that these chemical composition coatings facilitated significant anti-corrosion and anti-wear improvement. However, the samples coated with Al 2 O 3-40TiO 2 exhibited the lowest corrosion rate. In terms of wear performance, both coated samples displayed similar behavior under different loads. Scanning electron microscopy (SEM) showed the distinctive microstructure of the HVOF-sprayed samples before and after corrosion and wear testing.
Coatings, 2021
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 spectros...