The Experts below are selected from a list of 300 Experts worldwide ranked by ideXlab platform
Gaurav Sant - One of the best experts on this subject based on the ideXlab platform.
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Steel corrosion inhibition by Calcium Nitrate in halide-enriched completion fluid environments
npj Materials Degradation, 2018Co-Authors: Shiqi Dong, Mehrdad Torabzadegan, Erika Callagon La Plante, Magdalena Balonis, Mathieu Bauchy, Xin Chen, Gaurav SantAbstract:Calcium Nitrate (Ca(NO_3)_2) has been suggested to inhibit steel corrosion. However, the effectiveness of corrosion inhibition offered by Calcium Nitrate in highly halide-enriched environments, for example, completion fluids, is not well known. To better understand this, the inhibition of corrosion of API P110 steel by Ca(NO_3)_2 was studied using vertical scanning interferometry in solutions consisting of 10 mass % Calcium chloride (CaCl_2) or 10 mass % Calcium bromide (CaBr_2), for example, to simulate the contact of completion fluids with the steel sheath in downhole (oil and gas) applications. The evolution of the surface topography resulting from the initiation and growth of corrosion pits, and general corrosion was examined from the nano-scale to micron-scale using vertical scanning interferometry. Special focus was paid to quantify surface evolution in the presence of Ca(NO_3)_2. The results indicate that, at low concentrations (≈1 mass %), Ca(NO_3)_2 successfully inhibited steel corrosion in the presence of both CaCl_2 and CaBr_2. Statistical analysis of surface topography data reveals that such inhibition results from suppression of corrosion at fast corroding pitting sites. However, at higher concentrations, Calcium Nitrate’s effectiveness as a corrosion inhibitor is far less substantial. These results provide a means to rationalize surface topography evolution against the electrochemical origin of corrosion inhibition by NO_3^− species, and provide guidance regarding the kinetics, and susceptibility to degradation of the steel sheath during exposure to halide-enriched completion fluids.Steel corrosion: Aggressive environmentsThe inhibition of steel corrosion by Calcium Nitrate in halide-rich environments like those used in oil and gas production has been studied. ‘Completion fluids’ that contain high concentrations of halides (e.g. Cl-, Br-) are used to prepare wells for gas or oil extraction, they can, however, cause significant corrosion to steel components. Calcium Nitrate (Ca(NO_3)_2) is known to inhibit steel corrosion, but whether this is the case in halide-rich environments is unknown. Now, a team lead by Gaurav Sant at the University of California, Los Angeles, has studied just this, examining the development of corrosion from the nano- to micron- scales using vertical scanning interferometry. They learned that Ca(NO_3)_2 inhibits steel corrosion in low-concentration chloride and bromide solutions, however, it was far less effective at high concentrations.
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Steel corrosion inhibition by Calcium Nitrate in halide-enriched completion fluid environments
npj Materials Degradation, 2018Co-Authors: Shiqi Dong, Mehrdad Torabzadegan, Erika Callagon La Plante, Magdalena Balonis, Mathieu Bauchy, Xin Chen, Gaurav SantAbstract:Calcium Nitrate (Ca(NO3)2) has been suggested to inhibit steel corrosion. However, the effectiveness of corrosion inhibition offered by Calcium Nitrate in highly halide-enriched environments, for example, completion fluids, is not well known. To better understand this, the inhibition of corrosion of API P110 steel by Ca(NO3)2 was studied using vertical scanning interferometry in solutions consisting of 10 mass % Calcium chloride (CaCl2) or 10 mass % Calcium bromide (CaBr2), for example, to simulate the contact of completion fluids with the steel sheath in downhole (oil and gas) applications. The evolution of the surface topography resulting from the initiation and growth of corrosion pits, and general corrosion was examined from the nano-scale to micron-scale using vertical scanning interferometry. Special focus was paid to quantify surface evolution in the presence of Ca(NO3)2. The results indicate that, at low concentrations (≈1 mass %), Ca(NO3)2 successfully inhibited steel corrosion in the presence of both CaCl2 and CaBr2. Statistical analysis of surface topography data reveals that such inhibition results from suppression of corrosion at fast corroding pitting sites. However, at higher concentrations, Calcium Nitrate’s effectiveness as a corrosion inhibitor is far less substantial. These results provide a means to rationalize surface topography evolution against the electrochemical origin of corrosion inhibition by NO3− species, and provide guidance regarding the kinetics, and susceptibility to degradation of the steel sheath during exposure to halide-enriched completion fluids. The inhibition of steel corrosion by Calcium Nitrate in halide-rich environments like those used in oil and gas production has been studied. ‘Completion fluids’ that contain high concentrations of halides (e.g. Cl-, Br-) are used to prepare wells for gas or oil extraction, they can, however, cause significant corrosion to steel components. Calcium Nitrate (Ca(NO3)2) is known to inhibit steel corrosion, but whether this is the case in halide-rich environments is unknown. Now, a team lead by Gaurav Sant at the University of California, Los Angeles, has studied just this, examining the development of corrosion from the nano- to micron- scales using vertical scanning interferometry. They learned that Ca(NO3)2 inhibits steel corrosion in low-concentration chloride and bromide solutions, however, it was far less effective at high concentrations.
Jian Jun Huang - One of the best experts on this subject based on the ideXlab platform.
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Municipal River Sediment Remediation with Calcium Nitrate, Polyaluminium Chloride and Calcium Peroxide Compound
Advanced Materials Research, 2011Co-Authors: Jian Jun Huang, Yuhong Li, Nan LiAbstract:In situ laboratory studies were carried out in simulated reactors to evaluate the potential of Calcium Nitrate, Polyaluminium Chloride (PAC) and Calcium peroxide for remediation municipal river sediment. Calcium peroxide could increase the dissolved oxygen concentration (DO) of water for long time (8 weeks). It would optimize the anoxia environment of sediment and be propitious for remediation of sediment. The disadvantage of Calcium peroxide was that pH (8.6) would rise slightly and accelerate NH3-N release. Spraying poly-aluminum chloride also could prohibit phosphorus release from sediment. But the remediation effect might be weakened due to disorganization of the aluminium floc after period of time. Phosphorus release from sediment injected Calcium Nitrate was almost stopped during the experiment. Calcium Nitrate could greatly improve the ability of bio-treatment properties for sediment. After 28 weeks of treatment, the TN concentration with dose of 70g per square meter NO3-N could reduce to common level compared to blank reactor by denitrification. It makes in-situ chemical remediation technology by Calcium Nitrate injection become possibly.
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Notice of Retraction Testing Calcium Nitrate addition as a tool for municipal river sediment remediation
2010 The 2nd Conference on Environmental Science and Information Application Technology, 2010Co-Authors: Jian Jun Huang, Hongwei Zhang, Yu TianAbstract:The application of Nitrate is an accepted procedure to manage eutrophication municipal rivers by controlling the phosphorus release from sediments into overlying water and offering electron acceptor for microorganism metabolism. An in-situ-experiment was carried out to oxidize the sediment by direct Calcium Nitrate injection. Phosphorus release from sediment injected Calcium Nitrate was almost stopped during the experiment. Calcium Nitrate can greatly improve the ability of bio-treatment properties for sediment. After 30 weeks of treatment, the sediment TOC decreased by 10.5%, 9.5% in reactor with a dose of 140g and 70g per square meter NO3-N, respectively. The TN concentration with dose of 70g per square meter NO3-N can reduce to common level compared to blank reactor by denitrification. It makes in-situ chemical remediation technology by Calcium Nitrate injection become possibly.
Shiqi Dong - One of the best experts on this subject based on the ideXlab platform.
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Steel corrosion inhibition by Calcium Nitrate in halide-enriched completion fluid environments
npj Materials Degradation, 2018Co-Authors: Shiqi Dong, Mehrdad Torabzadegan, Erika Callagon La Plante, Magdalena Balonis, Mathieu Bauchy, Xin Chen, Gaurav SantAbstract:Calcium Nitrate (Ca(NO_3)_2) has been suggested to inhibit steel corrosion. However, the effectiveness of corrosion inhibition offered by Calcium Nitrate in highly halide-enriched environments, for example, completion fluids, is not well known. To better understand this, the inhibition of corrosion of API P110 steel by Ca(NO_3)_2 was studied using vertical scanning interferometry in solutions consisting of 10 mass % Calcium chloride (CaCl_2) or 10 mass % Calcium bromide (CaBr_2), for example, to simulate the contact of completion fluids with the steel sheath in downhole (oil and gas) applications. The evolution of the surface topography resulting from the initiation and growth of corrosion pits, and general corrosion was examined from the nano-scale to micron-scale using vertical scanning interferometry. Special focus was paid to quantify surface evolution in the presence of Ca(NO_3)_2. The results indicate that, at low concentrations (≈1 mass %), Ca(NO_3)_2 successfully inhibited steel corrosion in the presence of both CaCl_2 and CaBr_2. Statistical analysis of surface topography data reveals that such inhibition results from suppression of corrosion at fast corroding pitting sites. However, at higher concentrations, Calcium Nitrate’s effectiveness as a corrosion inhibitor is far less substantial. These results provide a means to rationalize surface topography evolution against the electrochemical origin of corrosion inhibition by NO_3^− species, and provide guidance regarding the kinetics, and susceptibility to degradation of the steel sheath during exposure to halide-enriched completion fluids.Steel corrosion: Aggressive environmentsThe inhibition of steel corrosion by Calcium Nitrate in halide-rich environments like those used in oil and gas production has been studied. ‘Completion fluids’ that contain high concentrations of halides (e.g. Cl-, Br-) are used to prepare wells for gas or oil extraction, they can, however, cause significant corrosion to steel components. Calcium Nitrate (Ca(NO_3)_2) is known to inhibit steel corrosion, but whether this is the case in halide-rich environments is unknown. Now, a team lead by Gaurav Sant at the University of California, Los Angeles, has studied just this, examining the development of corrosion from the nano- to micron- scales using vertical scanning interferometry. They learned that Ca(NO_3)_2 inhibits steel corrosion in low-concentration chloride and bromide solutions, however, it was far less effective at high concentrations.
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Steel corrosion inhibition by Calcium Nitrate in halide-enriched completion fluid environments
npj Materials Degradation, 2018Co-Authors: Shiqi Dong, Mehrdad Torabzadegan, Erika Callagon La Plante, Magdalena Balonis, Mathieu Bauchy, Xin Chen, Gaurav SantAbstract:Calcium Nitrate (Ca(NO3)2) has been suggested to inhibit steel corrosion. However, the effectiveness of corrosion inhibition offered by Calcium Nitrate in highly halide-enriched environments, for example, completion fluids, is not well known. To better understand this, the inhibition of corrosion of API P110 steel by Ca(NO3)2 was studied using vertical scanning interferometry in solutions consisting of 10 mass % Calcium chloride (CaCl2) or 10 mass % Calcium bromide (CaBr2), for example, to simulate the contact of completion fluids with the steel sheath in downhole (oil and gas) applications. The evolution of the surface topography resulting from the initiation and growth of corrosion pits, and general corrosion was examined from the nano-scale to micron-scale using vertical scanning interferometry. Special focus was paid to quantify surface evolution in the presence of Ca(NO3)2. The results indicate that, at low concentrations (≈1 mass %), Ca(NO3)2 successfully inhibited steel corrosion in the presence of both CaCl2 and CaBr2. Statistical analysis of surface topography data reveals that such inhibition results from suppression of corrosion at fast corroding pitting sites. However, at higher concentrations, Calcium Nitrate’s effectiveness as a corrosion inhibitor is far less substantial. These results provide a means to rationalize surface topography evolution against the electrochemical origin of corrosion inhibition by NO3− species, and provide guidance regarding the kinetics, and susceptibility to degradation of the steel sheath during exposure to halide-enriched completion fluids. The inhibition of steel corrosion by Calcium Nitrate in halide-rich environments like those used in oil and gas production has been studied. ‘Completion fluids’ that contain high concentrations of halides (e.g. Cl-, Br-) are used to prepare wells for gas or oil extraction, they can, however, cause significant corrosion to steel components. Calcium Nitrate (Ca(NO3)2) is known to inhibit steel corrosion, but whether this is the case in halide-rich environments is unknown. Now, a team lead by Gaurav Sant at the University of California, Los Angeles, has studied just this, examining the development of corrosion from the nano- to micron- scales using vertical scanning interferometry. They learned that Ca(NO3)2 inhibits steel corrosion in low-concentration chloride and bromide solutions, however, it was far less effective at high concentrations.
Nan Li - One of the best experts on this subject based on the ideXlab platform.
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Municipal River Sediment Remediation with Calcium Nitrate, Polyaluminium Chloride and Calcium Peroxide Compound
Advanced Materials Research, 2011Co-Authors: Jian Jun Huang, Yuhong Li, Nan LiAbstract:In situ laboratory studies were carried out in simulated reactors to evaluate the potential of Calcium Nitrate, Polyaluminium Chloride (PAC) and Calcium peroxide for remediation municipal river sediment. Calcium peroxide could increase the dissolved oxygen concentration (DO) of water for long time (8 weeks). It would optimize the anoxia environment of sediment and be propitious for remediation of sediment. The disadvantage of Calcium peroxide was that pH (8.6) would rise slightly and accelerate NH3-N release. Spraying poly-aluminum chloride also could prohibit phosphorus release from sediment. But the remediation effect might be weakened due to disorganization of the aluminium floc after period of time. Phosphorus release from sediment injected Calcium Nitrate was almost stopped during the experiment. Calcium Nitrate could greatly improve the ability of bio-treatment properties for sediment. After 28 weeks of treatment, the TN concentration with dose of 70g per square meter NO3-N could reduce to common level compared to blank reactor by denitrification. It makes in-situ chemical remediation technology by Calcium Nitrate injection become possibly.
Daniel Honc - One of the best experts on this subject based on the ideXlab platform.
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calorimetric study of Calcium Nitrate tetrahydrate and magnesium Nitrate hexahydrate
Journal of Thermal Analysis and Calorimetry, 2016Co-Authors: Galina Sadovska, Pavla Honcova, Radim Pilař, Lucie Oravova, Daniel HoncAbstract:The heat capacity and enthalpy of fusion of Calcium Nitrate tetrahydrate and magnesium Nitrate hexahydrate were determined from 234.15 K to melting temperature by DSC. The modified stepwise method was used for heat capacity measurement, and enthalpy of fusion was determined from continuous heating by the rate of 10 K min−1 (Pilař et al. in J Therm Anal Calorim 118:485–491, 2014). Determined values were used for the calculation of entropy and Gibbs energy in the experimental temperature range. Melting point and enthalpy of fusion of Calcium Nitrate tetrahydrate are 317.1 ± 0.3 K and 36.6 ± 0.2 kJ mol−1, and for the magnesium Nitrate hexahydrate, the values are 362.9 ± 0.4 K and 40.8 ± 0.5 kJ mol−1. One solid–solid phase transformation was observed for the magnesium salt at 345.7 ± 0.9 K with enthalpy of transition 3.1 ± 0.2 kJ mol−1. The available accumulated energy composed of sensible (heating) and latent heat (phase transformations) is 43.4 and 63.8 kJ mol−1 for the hydrated Calcium and magnesium Nitrate, respectively. The kinetics of solid–solid phase transformation for magnesium salt was studied under non-isothermal conditions by DSC, and the process was described using autocatalytical model with parameters in the range of 0.50–0.85 for m and range of 2.58–1.48 for n, respectively.
