Download or read book Mechanism and Prediction of Mild Steel Corrosion in Aqueous Solutions Containing Carboxylic Acids Carbon Dioxide and Hydrogen Sulfide written by Aria Kahyarian and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Pipeline corrosion in upstream oil and gas production and transmission facilities is a major design and maintenance concern. Corrosion in such environments is, to the most part, the results of the presence of an aqueous phase containing weak acids such as carboxylic acids, carbonic acid, and hydrogen sulfide. The proper understanding of encountered corrosion processes and reliable predicted corrosion rates are essential for major design decisions relating to material selection, pipe wall thickness allowance and adoption of appropriate maintenance procedures, such as use of corrosion inhibitors and frequency of in-line inspections.

Download or read book Corrosion in CO2 Capture Transportation Geological Utilization and Storage written by Liwei Zhang and published by Springer Nature. This book was released on 2023-07-21 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book systematically discusses the operational stages with high risk of CO2-induced corrosion in CCUS projects, and related measures for corrosion control. CO2 capture, utilization, and storage (CCUS) is a key technology to mitigate climate change and substantially reduce greenhouse gas emissions from fossil fuels. CCUS deals with high concentration CO2, which is very corrosive in a humid environment. Therefore, it is very important to characterize, monitor, and mitigate CO2-induced corrosion in all processes of the CCUS operation chain. Some corrosion control techniques included in this book (e.g., CO2-resisting wellbore cement additives) are beneficial for corrosion control research and engineering practices. This book belongs to the field of corrosion science and engineering, and the expected readership is researchers and engineers working on CCUS.

Download or read book Mechanism and Modeling of Galvanic Corrosion Between Mild Steel and Iron Aulfides in Acidic Solutions written by Payman Sharifi Abdar and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sour hydrocarbon reservoirs, containing H2S gas, are receiving increasing attention due to the growing demand for energy. Although uniform corrosion is not a significant obstacle for oil and gas companies in sour environments, the major challenge in this field is prevention of localized corrosion that can cause failures in production infrastructure. Formation of different types of iron sulfides as corrosion products has been postulated to be a main culprit for localized attack, due to their wide-ranging physicochemical properties, such as their electrical conductivities. The galvanic coupling between iron sulfides layers and mild steel was shown to be the mechanism associated with the localized attacks in sour environments. However, the mechanism of galvanic coupling between mild steel and iron sulfides has not been understood due to the lack of systematic and parametric studies. The research described herein addresses the galvanic coupling between mild steel and iron sulfide polymorphs to investigate the involved mechanisms. For the first step, the uniform corrosion of mild steel in aqueous H2S solutions was critically reviewed, and the mechanism associated with this system including the involved chemical electrochemical reactions was fully described. Furthermore, the mathematical modeling of uniform corrosion rate of mild steel in H2S environments was also comprehensively reviewed. In addition, some new approaches for the modeling of electrochemical reactions as well as corrosion rate were proposed, and the validity of the proposed models were verified through comparing with experimental data. Next step of the current research focused on the galvanic corrosion between mild steel and iron sulfides using both experimental and modeling investigations. In the experimental section, a systematic study was performed in order to determine the contribution of the influential parameters on the galvanic corrosion between mild steel and iron sulfides. On that account, the effect of several important parameters including iron sulfide type, cathode to anode surface area ratio, and solution’s conductivity was examined. Although the conductivity of solution did not show significant impact on the galvanic corrosion rate in the studied experimental conditions, the type of iron sulfide as well as the cathode to anode surface area ratio notably affected the galvanic coupling process. Specifically, the two types of iron sulfides used here, pyrite and pyrrhotite, were shown to produce different galvanic corrosion due to their different electrochemical behaviors. To further elucidate the mechanism of the impact of iron sulfide type, the cathodic behavior of pyrite and pyrrhotite was systematically studied using rotating disk electrode system. The results revealed that pyrrhotite has significantly higher cathodic current than pyrite. This difference originates from different cathodic reactions occurring at the surface of these iron sulfides. Therefore, the associated cathodic reactions were also proposed in this study. The modeling section started with the proposed model for the cathodic current density of mild steel, pyrite, and pyrrhotite. The mathematical model was based on the proposed cathodic reactions as well as the constants found from experimental investigation. The proposed model was then verified by comparing it to the experimental data obtained in this study. In the final part of the current study, a mathematical model based on the polarization measurements was proposed for the prediction of galvanic corrosion rate between mild steel and iron sulfides. The model was compared with the experimental results at various experimental conditions, and very good agreement was found between experimental and modeling results. To summarize, the current research was ale to reveal some mechanistic aspects of the galvanic coupling between mild steel and iron sulfides. The impact of the influential parameters and the electrochemical characteristic of iron sulfides were revealed. Also, the current research, for the first time, developed a mathematical model for the prediction of cathodic current on iron sulfides and the galvanic corrosion rate between mild steel and iron sulfides.

Download or read book The Effect of Salt Concentration on Aqueous Strong Acid Carbon Dioxide and Hydrogen Sulfide Corrosion of Carbon Steel written by Fazlollah Madani Sani and published by . This book was released on 2021 with total page 670 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aqueous brines are often produced during hydrocarbon recovery from geological reservoirs as an unwanted by-product. Degree of salinity is always an issue in produced water. In the USA, salt concentration in waters produced from conventional oil and gas wells falls in the range of 1 g/l (~ 0.1 wt.%) to 400 g/l (~ 28 wt.%). Besides salts, CO2 and H2S are ubiquitous in the production stream. Dissolution of these gases in produced waters results in evolution of corrosive species, such as CO2(aq), H2S(aq), H2CO3(aq), H+(aq), HCO-3(aq), and HS-(aq) that cause severe corrosion problems for carbon steel; primary material used in the construction of oil and gas pipelines. Combination of aqueous salts with dissolved CO2(aq) and H2S(aq) and their related species, has always been a great concern for pipeline operators in terms of corrosion problems. A large body of research exists on CO2 and H2S corrosion of oil and gas facilities, mostly at low salt concentrations; up to 3 wt.%. However, only a limited number of studies has investigated CO2 corrosion at high salt concentrations and to the best of this author’s knowledge, this number is zero for H2S corrosion. In the present study, the effect of salt (NaCl) concentration on aqueous uniform strong acid, CO2, and H2S corrosion of carbon steel is investigated. The key parameters in the corrosion process that are influenced by salt concentration are identified: transport phenomena (solution density, solution viscosity and diffusion coefficients of dissolved species), solution chemistry, and electrochemistry of the underlying reactions. Models have been reproduced and developed to account for the effect of salinity (up to ~ 5 m NaCl) on transport phenomena and solution chemistry. The Smolyakov and the square root (Kohlrausch law) equations were chosen for correcting the diffusion coefficients for the effect of temperature, and salt concentration, respectively, using new coefficients obtained in this study. The mixed solvent electrolyte (MSE) model, which is the only comprehensive solution chemistry model available in the literature for the H2O-NaCl-CO2-H2S systems is reproduced. The MSE model is used to calculate the equilibrium activity and activity coefficients of dissolved species important in aqueous strong acids, CO2, and H2S corrosion of carbon steel. pH measurements at 1 bar total pressure and temperatures below 80oC showed that the autogenous pH of aqueous CO2- and H2S-saturated solutions decreased with increasing NaCl concentration. The reason for the decrease in the solution pH was attributed to the increase in the activity coefficient of the H+ ion. The effect of salt concentration on electrochemistry and rate of strong acid, CO2, and H2S corrosion was studied by performing eight sets of experiments in aqueous N2-, CO2-, and H2S-satuared solutions at temperatures below 80oC, 1 bar total pressure, solution pH values between 3 to 5, and different NaCl concentrations, ranging from 0.1 wt.% (0.017 m) to 20 wt.% (4.27 m). The weight loss and linear polarization resistance corrosion rate measurements showed that the corrosion rate for all three types of corrosion generally decreased with increasing NaCl concentration. The analysis of potentiodynamic polarization sweeps indicated that increasing NaCl concentration decreased the rate of the cathodic H+ ion reduction reaction continually, while the rate of the cathodic water reduction reaction was mostly increased. The rate of anodic dissolution of iron in the active region increased at lower NaCl concentrations and then switched trend and decreased at higher NaCl concentrations. In strong acid corrosion, salt concentration seemed to have no effect on the mechanism of active dissolution of iron.

Download or read book Metals Abstracts written by and published by . This book was released on 1988 with total page 1522 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Corrosion of Steel by Gases Containing Traces of Hydrogren Sulphide Effect of Pressure and Moisture Condition written by John Michael Devine and published by . This book was released on 1933 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Initiation and Propagation of Localized Corrosion of Mild Steel in Marginally Sour Environments written by Wei Zhang and published by . This book was released on 2020 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt: A systematic investigation of pitting failure of mild steel in marginally sour environments was performed with the objective of understanding and predicting the occurrence of localized corrosion. While localized corrosion can happen due to a variety of reasons, recent work has shown that mild steel was particularly susceptible to pitting in environments containing traces of H2S (ppm level in the gas phase, which equates to ppb level of dissolved O2 in the liquid phase) of H2S. Relevant research works related to localized corrosion of mild steel exposed to O2, CO2 and H2S containing aqueous environments were carefully reviewed and a critical comparison was performed, identifying experimental methodologies, common mechanisms and gaps in understanding. A comprehensive parametric study was conducted to identify the operating parameters controlling the occurrence of localized corrosion in marginally sour environments. As a result, pitting was found to occur under the following conditions: 0 mbar pH2S 0.15 mbar, pCO2 0 bar, temperature

Download or read book Corrosion behavior of mild steel in artificial sea water containing hydrogen sulfide written by H. Sasaki and published by . This book was released on 1977 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Aqueous Corrosion of Steel in H2S and H2S CO2 Containing Solutions written by Trond Rogne and published by . This book was released on 1983 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Mechanistic Study of Under Deposit Corrosion of Mild Steel in Aqueous Carbon Dioxide Solution written by Jin Huang and published by . This book was released on 2013 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Corrosion and deposition during the exposure of carbon steel to hydrogen sulfide water solutions written by A. G. Wikjord and published by . This book was released on 1980 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Stress corrosion Cracking of Mild Steel in Aqueous Solutions written by R. Usher and published by . This book was released on 1957 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Localized Corrosion written by Fumio Hine and published by . This book was released on 1988 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book CORROSION BEHAVIOUR OF MILD STEEL IN ARTIFICIAL SEA WATER CONTAINING HYDROGEN SULFIDE written by H. Sasaki and published by . This book was released on 1979 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Metals Abstracts Index written by and published by . This book was released on 1995 with total page 1390 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Development of a Mechanistic Corrosion Model for Carbon Steel in MEA based CO2 Absorption Process written by Ameerudeen Najumudeen and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Inhibition of Corrosion of Mild Steel in CO2 Containing Solutions written by Gerardo Zavala-Olivares and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: