Author: J. E. DorguPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Weldment Corrosion and Inhibitor in Carbon Dioxide Saturated Brine
Author: J. E. DorguInhibition of Weld Corrosion in Flowing Brines Containing Carbon Dioxide
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
The aim of this research was to study the effectiveness of a typical oilfield corrosion inhibitor, which is considered to be a green inhibitor (non toxic to the environment) in controlling internal corrosion of welded X65 pipeline steel in brines saturated with carbon dioxide at one bar pressure, under dynamic flowing conditions, over a range of temperatures. Several experimental configurations were used ranging from a simple flat plate design to a novel rotating cylinder electrode, to allow high shear stress to be achieved. The rotating cylinder electrode (RCE) apparatus was designed to allow steel from the weld metal, heat affected zone (HAZ) and parent material to be galvanically coupled and tested in high shear stress conditions. In producing the RCE, the three regions of the weld were identified by optical metallography and samples of each were machined to produce cylindrical electrodes, which were mounted on a motor driven shaft. Electrical connections were made to the three electrodes via a high quality slip-ring assembly. The galvanic currents flowing between the regions of the weld were recorded using zero-resistance ammeters and their self-corrosion rates were found by uncoupling the electrodes and performing polarization resistance measurements. For static conditions the inhibitor had an effective performance and after a short initial period during which film formation took place, at longer exposure times a dramatic reduction of corrosion rate was obtained. Under flowing conditions, both the galvanic currents and the self-corrosion rates were found to increase with the shear stress, as the rotational speed of the RCE was increased. The total corrosion rate of each weld region was assessed from the sum of the self-corrosion and galvanic contributions. In most cases, the weld metal and HAZ were shown to be cathodic to the parent material and this was considered to be a desirable situation as localised corrosion of the weld was minimised. However, in some ci.
Mechanism of Localized Corrosion of Carbon Steel Pipe in Corrosion-inhibited, CO2-saturated Brine
Author: Bryon Daniels WingetPublisher:
ISBN:
Category :
Languages : en
Pages : 178
Book Description
Inhibition of Weld Corrosion in Flowing Brines Containing Carbon Dioxide
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
The aim of this research was to study the effectiveness of a typical oilfield corrosion inhibitor, which is considered to be a green inhibitor (non toxic to the environment) in controlling internal corrosion of welded X65 pipeline steel in brines saturated with carbon dioxide at one bar pressure, under dynamic flowing conditions, over a range of temperatures. Several experimental configurations were used ranging from a simple flat plate design to a novel rotating cylinder electrode, to allow high shear stress to be achieved. The rotating cylinder electrode (RCE) apparatus was designed to allow steel from the weld metal, heat affected zone (HAZ) and parent material to be galvanically coupled and tested in high shear stress conditions. In producing the RCE, the three regions of the weld were identified by optical metallography and samples of each were machined to produce cylindrical electrodes, which were mounted on a motor driven shaft. Electrical connections were made to the three electrodes via a high quality slip-ring assembly. The galvanic currents flowing between the regions of the weld were recorded using zero-resistance ammeters and their self-corrosion rates were found by uncoupling the electrodes and performing polarization resistance measurements. For static conditions the inhibitor had an effective performance and after a short initial period during which film formation took place, at longer exposure times a dramatic reduction of corrosion rate was obtained. Under flowing conditions, both the galvanic currents and the self-corrosion rates were found to increase with the shear stress, as the rotational speed of the RCE was increased. The total corrosion rate of each weld region was assessed from the sum of the self-corrosion and galvanic contributions. In most cases, the weld metal and HAZ were shown to be cathodic to the parent material and this was considered to be a desirable situation as localised corrosion of the weld was minimised. However, in some ci.
A Temperature Dependent Study of Fe Corrosion Inhibition in CO2 Saturated Brine
Author: Ai OThe Application of Surface Enhanced Raman Spectroscopy to the Study of CO2 Corrosion of Carbon Steel in Brines in the Presence of Organic Inhibitors
Author: Lucy Jane OblonskyCorrosion of Mild Steel in Carbon Dioxide Saturated Brine Using Jet Impingement Tests
Author: R. C. WoollamAdvances in Corrosion Control and Materials in Oil and Gas Production
Author: P. S. JackmanPublisher: CRC Press
ISBN:
Category : Business & Economics
Languages : en
Pages : 496
Book Description
These papers from two recent European Federation of Corrosion conferences, EURCORR '97 and EURCORR '98, deal with advances in the understanding of corrosion and performance of equipment in upstream oil and gas operations. The opening section includes two keynote papers on: the materials and corrosion view of wet gas transportation; and the modelling of low induced localised corrosion from critical hydrodynamic data and fracture mechanics data of CO2 corrosion scales. The further 45 papers cover carbon and low alloy steels, martensitic stainless steels, corrosion resistant alloys, galvanic corrosion, corrosion inhibitors and other materials.
Green Inhibition of Mild Steel Corrosion in a Carbon Dioxide Saturated Saline Solution
Author: Elron Edgar GomesPublisher:
ISBN:
Category : Corrosion and anti-corrosives
Languages : en
Pages : 189
Book Description
"Mild steel is extensively used in equipment such as pipelines and machinery by many industries, where it is exposed to corrosive environments. Dissolved carbon dioxide (CO2) can be found in produced water and results in severe corrosion due to the formation of carbonic acid. CO2 corrosion presents not only an economic loss but also an environmental and safety risk. Most industries use synthetic inhibitors, which are effective in reducing corrosion, but are also toxic and persistent. This has led to stricter regulations and thus, there is a need for alternative inhibitors which can replace them but not exhibit their undesired characteristics. The aqueous extracts of Fig leaves (FLE), Calotropis procera (CPLE) and Eggplant peels (EPPE) were investigated as novel corrosion inhibitors for mild steel in a CO2-saturated 3.5wt% NaCl solution using various electrochemical techniques such as linear polarization resistance (LPR), electrochemical impedance spectroscopy (EIS) and cyclic sweep (CS). The results showed that the corrosion rate is decreasing and inhibition efficiency is increasing as the concentration of inhibitor increased. Corrosion inhibition efficiencies of 90-95% were obtained using low dosage of the green inhibitors. FLE, CPLE and EPPE proved to be effective inhibitors and are compared to the performance of two commercially available inhibitors, A (green inhibitor) and B (synthetic inhibitor). Polarization studies show that FLE, CPLE and EPPE act as mixed inhibitors. The adsorption data was analyzed using various adsorption isotherm models and the results at temperatures of 25, 40, 50 and 70°C have shown that the adsorption behavior of FLE, CPLE and EPPE is best described by the Langmuir adsorption isotherm. The conclusion drawn from this work is that the FLE, CLE and ELE inhibitors proved to be effective inhibitors when compared to Inhibitor A. Inhibitor B proved to be a much more effective inhibitor than the others due to its synergistic mix of active ingredients."--Abstract.
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