Effect of Temperature on CO2/H2S Corrosion of Oil Tube Steels

2014 ◽  
Vol 908 ◽  
pp. 111-114 ◽  
Author(s):  
Ying Wang
Keyword(s):  
Corrosion Rate ◽  
Effect Of Temperature ◽  
Corrosion Morphology ◽  
Corrosion Rates ◽  
Tube Steels ◽  
Corrosion Behaviors ◽  
Rate Calculation

The CO2/H2S corrosion behaviors of oil tube steels N80 and P110 at different temperature were investigated by corrosion rate calculation and corrosion morphology observation. The results show that with the increase of temperature, the CO2/H2S corrosion rates of both steels increase at first and then decrease, and reach the peak at 90°C. The corrosion rate of steel P110 is higher than that of steel N80.

Effect of CO2 Partial Pressure on CO2/H2S Corrosion of Oil Tube Steels

2014 ◽  
Vol 962-965 ◽  
pp. 407-410
Author(s):  
Ying Wang
Keyword(s):  
Corrosion Rate ◽  
Partial Pressure ◽  
Corrosion Morphology ◽  
Corrosion Tests ◽  
Corrosion Rates ◽  
Tube Steels ◽  
Corrosion Behaviors ◽  
Rate Calculation

The CO2/H2S corrosion behaviors of oil tube steels N80 and P110 at different CO2 partial pressure (45psi, 135psi, 225psi, 315psi) were investigated by corrosion tests, corrosion rate calculation and corrosion morphology observation. The results show that at different CO2 partial pressure, super-serious CO2/H2S corrosion occurs on steel N80 and steel P110. With the increase of CO2 partial pressure, the CO2/H2S corrosion rates of both steels increase gradually.

Effect of H2S Partial Pressure on CO2/H2S Corrosion of Oil Tube Steels

2011 ◽  
Vol 239-242 ◽  
pp. 3131-3134
Author(s):  
Ying Wang ◽  
Ping Li
Keyword(s):  
Corrosion Rate ◽  
Partial Pressure ◽  
Corrosion Morphology ◽  
Corrosion Tests ◽  
Corrosion Rates ◽  
Tube Steels ◽  
Corrosion Behaviors ◽  
Rate Calculation

The CO2/H2S corrosion behaviors of oil tube steels N80 and P110 at different H2S partial pressure (0.2psi, 3psi, 9psi, 18psi) were investigated by autoclave corrosion tests, corrosion rate calculation and corrosion morphology observation. The results show that with the increase of H2S partial pressure the CO2/H2S corrosion rates of both steels increase at first and then decrease after the peaks appear at 3psi H2S.

Corrosion Behaviors of 25CrMnVA Steel in CO2 Flooding Enhanced Oil Recovery System

2013 ◽  
Vol 816-817 ◽  
pp. 1243-1249
Author(s):  
Chong Sun ◽  
Jian Bo Sun ◽  
Yong Wan ◽  
Xin Su ◽  
Yong Zhang
Keyword(s):  
Corrosion Rate ◽  
Partial Pressure ◽  
Oil Recovery ◽  
Oil Field ◽  
Uniform Corrosion ◽  
Corrosion Morphology ◽  
Corrosion Rates ◽  
Corrosion Scale ◽  
Corrosion Behaviors ◽  
Local Defects

Influences of temperature and CO2 partial pressure on CO2 corrosion behaviors of 25CrMnVA steel were investigated in the simulated oil field environments. The corrosion rates were measured under high temperature and high pressure condition. SEM, EDS and XRD were used to analyze the morphologies and characteristics of corrosion scales on the steels. The results shows that the corrosion rates of 25CrMnVA steel change little below 65°C, the corrosion feature is uniform corrosion. The corrosion rates increase rapidly after 65°C, mesa corrosion is found on the surface of steel. The corrosion rates decrease firstly and increase subsequently with the rising of CO2 partial pressure, and the minimal corrosion rate presents near CO2 critical pressure. The compactness of corrosion scale improves with the increase of CO2 partial pressure below 8MPa, which causes uniform corrosion rate reduced. Under supercritical CO2 condition, the local defects in the surface of corrosion scale increase, and the compactness of corrosion scale reduces,which cause the increase of corrosion rate sharply. The corrosion rate and corrosion morphology are closely related to the state of corrosion scale.

Corrosion Behaviors of Mg-7Gd-5Y-1Nd-0.5Zr Alloys in CO2 Atmosphere under Different Relative Humidity

2014 ◽  
Vol 900 ◽  
pp. 39-42
Author(s):  
Quan Tong Jiang ◽  
Xing Gang Li ◽  
Yong Jun Li ◽  
Ming Long Ma ◽  
Guo Liang Shi ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Weight Loss ◽  
Relative Humidity ◽  
Influence Factors ◽  
Corrosion Morphology ◽  
Corrosion Rates ◽  
Corrosion Behaviors ◽  
Peak Aged ◽  
Residual Mechanical Properties ◽  
Loss Rates

The corrosion behaviors of peak-aged Mg-7Gd-5Y-1Nd-0.5Zr alloys in CO2atmosphere under different relative humidity were investigated by OM, SEM. The weight loss rates, corrosion morphology and residual mechanical properties were also analyzed. The corrosion rates of specimens in CO2atmosphere at 70% relative humidity were highest than others. Relevancy of the influence factors included relative humidity and concentration of CO2were researched. The results show that relative humidity and concentration of CO2in the environment both played an important role in corrosion behaviors.

Corrosion behaviors of X70 steel under direct current interference

2019 ◽  
Vol 66 (3) ◽  
pp. 307-316 ◽  
Author(s):  
Jun Wang ◽  
Zili Li ◽  
Gan Cui ◽  
JianGuo Liu ◽  
Chuanping Kong ◽  
...  
Keyword(s):  
Weight Loss ◽  
Corrosion Rate ◽  
Soil Solution ◽  
Direct Current ◽  
Polarization Curves ◽  
Solution Ph ◽  
Corrosion Morphology ◽  
Content Type ◽  
Tafel Polarization ◽  
Corrosion Behaviors

Purpose The purpose of this paper is to study the corrosion behaviors of X70 steel under direct current (DC) interference at 0-1,200 A/m2 in simulated soil solution. Design/methodology/approach The Tafel polarization curves of X70 steel under DC interference were tested using electrochemical method, the corrosion rate was calculated using weight-loss method and the change in steel surface was analyzed by optical microscopy. Findings The results showed that E-I polarization curves under 200-1,200 A/m2 interference were linear; with an increase in the DC density, the corrosion potential of X70 steel shifted positively, solution pH after the weight-loss tests increased and corrosion rate increased linearly. A mathematical relationship between polarization resistance Rp and current density was established. Corrosion morphology indicated that pitting corrosion and crevice corrosion occurred on the X70 steel under DC interference in simulated soil solution. Originality/value All tests were conducted at a relative higher DC density (200-1,200 A/m2). The linear fitting method is proposed to fit data of Tafel polarization curves under DC interference. This study provides guidelines for safe operation of X70 steel pipelines.

scholarly journals Effect of Temperature on the Corrosion Behavior of Biodegradable AZ31B Magnesium Alloy in Ringer’s Physiological Solution

Metals ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 591 ◽  
Author(s):  
Sebastian Feliu ◽  
Lucien Veleva ◽  
Federico García-Galvan
Keyword(s):  
Corrosion Rate ◽  
Electrochemical Impedance ◽  
Physiological Solution ◽  
Corrosion Layer ◽  
Effect Of Temperature ◽  
X Ray ◽  
Ringer’S Solution ◽  
Corrosion Behaviors ◽  
Az31b Alloy ◽  
Increasing Temperature

In this work, the corrosion behaviors of the AZ31B alloy in Ringer’s solution at 20 °C and 37 °C were compared over four days to better understand the influence of temperature and immersion time on corrosion rate. The corrosion products on the surfaces of the AZ31B alloys were examined by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD). Electrochemical impedance spectroscopy (EIS) provided information about the protective properties of the corrosion layers. A significant acceleration in corrosion rate with increasing temperature was measured using mass loss and evolved hydrogen methods. This temperature effect was directly related to the changes in chemical composition and thickness of the Al-rich corrosion layer formed on the surface of the AZ31B alloy. At 20 °C, the presence of a thick (micrometer scale) Al-rich corrosion layer on the surface reduced the corrosion rate in Ringer’s solution over time. At 37 °C, the incorporation of additional Mg and Al compounds containing Cl into the Al-rich corrosion layer was observed in the early stages of exposure to Ringer’s solution. At 37 °C, a significant decrease in the thickness of this corrosion layer was noted after four days.

Corrosion Behavior of Rebar HRB400 in NaCl Solution

2013 ◽  
Vol 438-439 ◽  
pp. 353-356
Author(s):  
Ping Li ◽  
Ying Wang
Keyword(s):  
Corrosion Rate ◽  
Corrosion Behavior ◽  
Strong Consistency ◽  
Solution Concentration ◽  
Test Results ◽  
Nacl Solution ◽  
Corrosion Morphology ◽  
Rate Calculation ◽  
Corrosion Time

The corrosion behavior of rebar HRB400 in 0.5 wt.%, 1.5 wt.% and 3.5 wt.% NaCl solutions was investigated by corrosion rate calculation and corrosion morphology observation. The results showed that, with the increase of corrosion time from 240h to 720h, the corrosion rate of rebar HRB400 in each NaCl solution increases. With the increase of NaCl solution concentration, the corrosion rate of rebar HRB400 increases. The corrosion morphologies show strong consistency with the test results of corrosion rate.

Variation of Top of Line Corrosion Rates at Different Positions in Pipe

2017 ◽  
Author(s):  
J. Raghu Shant ◽  
Richard Barker ◽  
Anne Neville
Keyword(s):  
Corrosion Rate ◽  
Droplet Formation ◽  
Optical Microscope ◽  
Droplet Flow ◽  
Site Analysis ◽  
Corrosion Rates ◽  
Inner Surface ◽  
Different Temperatures ◽  
Optical Profilometer ◽  
Rate Calculation

The inner surface of pipe plays a crucial role in top of line corrosion when condensation of droplet takes place. Condensation over inner periphery of pipeline takes place by droplet formation due to differential temperature inside the pipe and external environmental factors. To understand the change in corrosion rates with respect to droplet flow and temperature [40°C, 60°C and 80°C], a rig with curvature 80mm which simulates top of line corrosion is designed to carry out experiments at 0°, 15° and 30° inclinations in fixed 3 litre beaker. Droplet formation on the sample as well as on perpex surface has been captured at different temperatures to understand the droplet size formation. Corrosion rate calculation is done my weight loss methods which are generally preferred in on site analysis instead of electrochemical measurements. Surface analysis is carried out with the help of optical microscope and optical profilometer where corrosion rate, inclination were correlated to average surface roughness.

Effect of Temperature on H2S/CO2 Corrosion Behaviors of P110-3Cr Steel

2013 ◽  
Vol 816-817 ◽  
pp. 54-59 ◽  
Author(s):  
Xin Su ◽  
Jian Bo Sun ◽  
Chong Sun ◽  
Bin Han
Keyword(s):  
Corrosion Rate ◽  
Corrosion Product ◽  
Iron Sulfide ◽  
Energy Dispersive Spectrometer ◽  
Corrosion Products ◽  
Effect Of Temperature ◽  
General Corrosion ◽  
X Ray Diffraction ◽  
X Ray ◽  
Corrosion Behaviors

Flowing solution environment containing H2S/CO2was simulated by high temperature and high pressure autoclave. Corrosion behaviors of P110-3Cr pipeline steels were investigated by Weight loss, Scanning electron microscopy (SEM), X-Ray diffraction (XRD) and Energy dispersive spectrometer (EDS). Effect of temperature on corrosion rate and corrosion product was discussed. The results showed that corrosion rate of P110-3Cr steel decrease at the beginning and then increased with rising temperature. The corrosion types are general corrosion. P110-3Cr has resistance to local corrosion. Mackinawite (FeS0.9) is formed as corrosion product in low-temperature condition. With temperature increasing the corrosion products are dominated by mackinawite (FeS0.9) and Cubic iron sulfide (Fe3S4). When temperature increased to 150 ¡æ, the corrosion products are made up of Hexagonal iron sulfide (Fe0.96S) and Orthorhombic Marcasite (FeS2). No siderite (FeCO3) is detected, the corrosion is controlled by H2S; Cr is rich in the corrosion scale.

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