The Effect of the Partial Pressure of H2S and CO2 on the Permeation of Hydrogen in Carbon Steel by Using Pressure Buildup Techniques

CORROSION ◽  
10.5006/3128 ◽  
2019 ◽  
Vol 75 (10) ◽  
pp. 1207-1215
Author(s):  
Nayef M. Alanazi ◽  
Abdullah A. Al-Enezi
Keyword(s):  
Steady State ◽  
Carbon Steel ◽  
Corrosion Rate ◽  
Partial Pressure ◽  
Hydrogen Permeation ◽  
Measurement Techniques ◽  
Permeation Rate ◽  
Pressure Buildup ◽  
Hydrogen Flux ◽  
The Relationship

There are concerns in the industry about using an electrochemical technique for actual hydrogen permeation measurements where charging current is not a field condition. The objective of this work is to use pressure buildup techniques to study the influence of H2S and CO2 partial pressure on the relationship between hydrogen permeation and corrosion rate measured by different techniques. Sulfide films formed on carbon steel in a solution containing 5 wt% NaCl and 0.5 wt% acidic acid at various H2S and CO2 partial pressures were characterized, and the effect of the film on hydrogen permeation was also investigated. Field conditions were included in this study for comparison purposes. The relationship was modeled at the steady state of both hydrogen flux and corrosion rate. The results confirmed by use of two hydrogen flux measurement techniques (eudiometer and high-pressure buildup probe) and two corrosion measurement methods (weight loss coupons and coupled multiarray electrode system), that there is no direct correlation between hydrogen flux and corrosion rate. Therefore, the hydrogen permeation rate in H2S and CO2 environments was found to be more controlled by partial pressure of H2S than corrosion rate. The amount of descent in hydrogen flux, after reaching maximum of hydrogen permeation rate and before reaching a steady state, depends on the morphology and structure of corrosion films which are mainly controlled by concentration of H2S.

Carbon Steel Canister Performance Assessment: Iron Transfer Study

2006 ◽  
Vol 932 ◽  
Author(s):  
Antonín Vokál ◽  
Dmitrij Lukin ◽  
Dušan Vopálka
Keyword(s):  
Steady State ◽  
Carbon Steel ◽  
Corrosion Rate ◽  
Performance Assessment ◽  
Host Rock ◽  
Computer Code ◽  
Spent Fuel ◽  
Iron Transfer ◽  
Corrosion Resistant ◽  
Transfer Study

ABSTRACTCarbon steel has been chosen in the Czech disposal concept of spent fuel disposal in a granite host rock as a reference material for disposal canisters. On the basis of the results of performance assessment studies, it could be decided whether this material is suitable or whether a more corrosion resistant, and also more expensive, material should substitute it. A number of papers have convincingly shown that iron transfer constraints contribute to a significant decrease in corrosion rate, but no study hasso far been devoted to modeling this process. In this paper the effects of initial corrosion rate, corrosion product solubility and porosity and other repository parameters on the transfer of iron to the host rock are modeled using a numerical transport computer code. It was found that the critical parameter for iron transfer is the solubility of corrosion products, considerably affecting the steady state corrosion rate. The initial corrosion rate of carbon steel and the sorption properties of bentonite primarily affect the time needed to achieve a steady state of corrosion. The results of the calculations strongly suggest that the constraints on iron transfer from the canister surface will govern the corrosion rate of carbon steel canisters, whose lifetime, owing to this effect, can stretch to millions of years.

The Influence of Hydrogen, Oxygen, and Ammonia on the Corrosion Behavior of Plain Carbon Steel in High Temperature Water

CORROSION ◽  
1968 ◽  
Vol 24 (10) ◽  
pp. 338-343 ◽  
Author(s):  
B. E. WILDE
Keyword(s):  
Steady State ◽  
Carbon Steel ◽  
Corrosion Rate ◽  
Oxide Film ◽  
Corrosion Behavior ◽  
Reduction Process ◽  
Plain Carbon Steel ◽  
Protective Oxide ◽  
Corrosion Rates ◽  
Protective Oxide Film

Abstract The corrosion behavior of plain carbon steel in high temperature water has been studied using electrochemical polarization techniques. The influence of oxygen, hydrogen, and ammonia on the corrosion behavior has been studied over the range < 0.1–100 ppm. Potentiostatic anodic polarization data indicate that only oxygen has any effect on the anodic dissolution kinetics of carbon steel at 289 C (552 F). Controlled potential corrosion experiments at highly noble potentials in oxygenated water did not produce any form of localized corrosion. Cathodic Tafel polarization data indicate that the primary cathodic partial process during corrosion on ammonia and hydrogenated solutions is the reduction of hydrogen ions. Reduced steady-state corrosion rates observed in ammoniated solutions are due to the severe reduction in the limiting diffusion rate of hydrogen ions because of a simple pH effect. In oxygenated solutions, over the range 0.1–50 ppm O2, the major reduction process is the reduction of H+. At 50–100 ppm O2 levels, however, the reduction process changes to O2 + 2H2O + 4e → 4OH−, with the formation of a protective oxide film and a reduction of the steady-state corrosion rate to 0.2 mdd. Linear polarization studies indicated that the steady-state corrosion rate of carbon steel on hydrogenated solutions is relatively independent of H2 content. The corrosion rate on ammoniated solutions decreased with NH3 content over the range 1–100 ppm NH3. Corrosion rates in oxygenated water over the range < 0.08–100 ppm increase through a maximum at approximately 50 ppm then decreases to a low value at 100 ppm. This behavior is interpreted by the formation of a protective oxide film which is dependent on oxygen content. X-ray diffraction studies indicate the presence of a duplex oxide film in high oxygen solutions consisting of γFe2O3 and Fe3O4. At lower oxygen levels, only αFe2O3 was observed and also in ammoniated solutions. In hydrogenated solutions, with the highers corrosion rates, only αFe2O3 was observed on the surface.

scholarly journals Effect of CO2 Partial Pressure on the Corrosion Behavior of J55 Carbon Steel in 30% Crude Oil/Brine Mixture

Materials ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 1765 ◽  
Author(s):  
Haitao Bai ◽  
Yongqing Wang ◽  
Yun Ma ◽  
Qingbo Zhang ◽  
Ningsheng Zhang
Keyword(s):  
Carbon Steel ◽  
Corrosion Rate ◽  
Crude Oil ◽  
Partial Pressure ◽  
Initial Period ◽  
Localized Corrosion ◽  
Corrosion Mechanism ◽  
Corrosion Properties ◽  
Co2 Partial Pressure ◽  
Corrosion Scale

The influence of CO2 partial pressure on the corrosion properties, including corrosion rate, morphology, chemical composition, and corrosion depth, of J55 carbon steel in 30% crude oil/brine at 65 °C was investigated. A corrosion mechanism was then proposed based on the understanding of the formation of localized corrosion. Results showed that localized corrosion occurred in 30% crude oil/brine with CO2. The corrosion rate sharply increased as the CO2 partial pressure (P co 2 ) was increased from 0 to 1.5 MPa, decreased from P co 2 = 1.5 MPa to P co 2 = 5.0 MPa, increased again at P co 2 = 5.0 MPa, and then reached a constant value after P co 2 = 9.0 MPa. The system pH initially decreased, rapidly increased, and then stabilized as CO2 partial pressure was increased. In the initial period, the surface of J55 carbon steel in the CO2/30% crude oil/brine mixtures showed intense corrosion. In conclusion, CO2 partial pressure affects the protection performance of FeCO3 by changing the formation of corrosion scale and further affecting the corrosion rate.

scholarly journals Determination the Corrosion Rate of Carbon Steel (0.4%C) Due to Thermal Cycling, Oil Cooled

2021 ◽  
Vol 65 (1) ◽  
pp. 74-78
Author(s):  
A.S.A. Elmaryami ◽  
Hafied M.B. Khalid ◽  
Abdulhakim Alamaria ◽  
Osama Alashebe ◽  
S.S. Ali ◽  
...  
Keyword(s):  
Steady State ◽  
Carbon Steel ◽  
Corrosion Rate ◽  
Thermal Cycling ◽  
Accurate Determination ◽  
Test Results ◽  
Heating And Cooling ◽  
Steel Bars ◽  
Lower Temperature

The effect of thermal cycling was carried out on steel bars (0.4 C %). A single run was performed at a lower temperature of 32℃ and an upper temperature of 500℃ cooled in water, seawater (previous results) and oil (new results). For several numbers of cycles up to 30 cycles for an accurate determination of heating and cooling times. The effect of thermal cycling on the corrosion rate was evaluated. The effect of thermal cycling on the following properties was evaluated the corrosion rate. The comparison between the effect of thermal cycling on carbon steel (0.4 C %) seawater and water-cooled (previous results as shown in references [1, 2]) and the effect of thermal cycling on carbon steel (0.4 C %) water-cooled (new results) has been studied. From the obtained test results (previous and in this paper, it was found that: the type of corrosion is uniform attack; corrosion rate of the first stage gradually increases with the number of thermal cycling up to 15 cycles, then it takes steady-state up to 30 cycles. It was found that the rate of corrosion (previous results, seawater and water-cooled) is more than the rate of corrosion of the new results, oil-cooled respectively.

Hyperventilation in ponies at the onset of and during steady-state exercise

1983 ◽  
Vol 54 (5) ◽  
pp. 1394-1402 ◽  
Author(s):  
L. G. Pan ◽  
H. V. Forster ◽  
G. E. Bisgard ◽  
R. P. Kaminski ◽  
S. M. Dorsey ◽  
...  
Keyword(s):  
Steady State ◽  
Partial Pressure ◽  
Blood Gases ◽  
Work Load ◽  
Co2 Partial Pressure ◽  
Arterial Blood ◽  
Carotid Bodies ◽  
Arterial Ph ◽  
Relationship Of ◽  
The Relationship

We studied blood gases in ponies to assess the relationship of alveolar ventilation (VA) to pulmonary CO2 delivery during moderate treadmill exercise. In normal ponies for 1.8, 3, or 6 mph, respectively, partial pressure of CO2 in arterial blood (PaCO2) decreased maximally by 3.1, 4.4, and 5.7 Torr at 30–90 s of exercise and remained below rest by 1.4, 2.3, and 4.5 Torr during steady-state (4–8 min) exercise (P less than 0.01). Partial pressure of O2 in arterial blood (PaO2) and arterial pH, (pHa) also reflected hyperventilation. Mixed venus CO2 partial pressure (PVCO2) decreased 2.3 and 2.9 Torr by 30 s for 3 and 6 mph, respectively (P less than 0.05). In work transitions either from 1.8 to 6 mph or from 6 mph to 1.8 mph, respectively, PaCO2 either decreased 3.8 Torr or increased 3.3 Torr by 45 s of the second work load (P less than 0.01). During exercise in acute (2–4 wk) carotid body denervated (CBD) ponies at 1.8, 3, or 6 mph, respectively, PaCO2 decreased maximally below rest by 9.0, 7.6, and 13.2 Torr at 30–45 s of exercise and remained below rest by 1.3, 2.3, and 7.8 Torr during steady-state (4–8 min) exercise (P less than 0.1). In the chronic (1–2 yr) CBD ponies, the hypocapnia was generally greater than normal but less than in the acute CBD ponies. We conclude that in the pony 1) VA is not tightly matched to pulmonary CO2 delivery during exercise, particularly during transitional states, 2) the exercise hyperpnea is not mediated by PaCO2 or PVCO2, and 3) during transitional states in the normal pony, the carotid bodies attenuate VA drive thereby reducing arterial hypocapnia.

Effects of Particle Size Distribution on Corrosion Rate of Carbon Steel in Soil

2020 ◽  
Vol 69 (4) ◽  
pp. 102-106
Author(s):  
Shota Ohki ◽  
Shingo Mineta ◽  
Mamoru Mizunuma ◽  
Soichi Oka ◽  
Masayuki Tsuda
Keyword(s):  
Particle Size ◽  
Carbon Steel ◽  
Corrosion Rate ◽  
Particle Size Distribution ◽  
Size Distribution

Mast Cells as a Double-Edged Sword in Immunity: Their Function in Health and Disease. First of Two Parts

2020 ◽  
Vol 20 (5) ◽  
pp. 654-669
Author(s):  
Thea Magrone ◽  
Manrico Magrone ◽  
Emilio Jirillo
Keyword(s):  
Steady State ◽  
Mast Cells ◽  
Immune Cells ◽  
Food Antigens ◽  
Health And Disease ◽  
The Relationship

Mast cells (MCs) have recently been re-interpreted in the context of the immune scenario in the sense that their pro-allergic role is no longer exclusive. In fact, MCs even in steady state conditions maintain homeostatic functions, producing mediators and intensively cross-talking with other immune cells. Here, emphasis will be placed on the array of receptors expressed by MCs and the variety of cytokines they produce. Then, the bulk of data discussed will provide readers with a wealth of information on the dual ability of MCs not only to defend but also to offend the host. This double attitude of MCs relies on many variables, such as their subsets, tissues of residency and type of stimuli ranging from microbes to allergens and food antigens. Finally, the relationship between MCs with basophils and eosinophils will be discussed.

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