scholarly journals Effects of Stray AC Interference on Corrosion Behavior of X70 Pipeline Steel in a Simulated Marine Soil Solution

2017 ◽  
pp. 1829-1845 ◽  
Author(s):  
Yingchao Li ◽  
Keyword(s):  
Soil Solution ◽  
Corrosion Behavior ◽  
Pipeline Steel ◽  
X70 Pipeline Steel ◽  
Ac Interference ◽  
Marine Soil

Corrosion Behavior of X70 Pipeline Steel and Corrosion Rate Prediction Under the Combination of Corrosive Medium and Applied Pressure

2017 ◽  
Author(s):  
Kaikai Li ◽  
Wei Wu ◽  
Guangxu Cheng ◽  
Yun Li ◽  
Haijun Hu ◽  
...  
Keyword(s):  
Natural Gas ◽  
Corrosion Rate ◽  
Tensile Stress ◽  
Partial Pressure ◽  
Corrosion Behavior ◽  
Pipeline Steel ◽  
Applied Pressure ◽  
Chloride Concentration ◽  
X70 Pipeline Steel ◽  
Co2 Partial Pressure

Natural gas transmission pipeline is prone to internal corrosion due to the combination of corrosive impurities in the pipe (such as CO2, H2S and chlorides) and applied pressure of the pipeline, which seriously affects the safe operation of the pipeline. In this work, the corrosion behavior of a typical X70 pipeline steel was investigated by using potentiodynamic polarization and electrochemical impendence spectroscopy (EIS). The polarization and EIS data under different CO2 partial pressures (0–1 atm), H2S concentrations (0–150 ppm), chloride concentrations (0–3.5 wt%) and tensile stress (0–400 MPa) were obtained. The results show that corrosion rate increases with the increase of CO2 partial pressure and chloride concentration, respectively, while first increases and then decreases with the increase H2S concentrations. The corrosion rate is less affected by elastic tensile stress. In addition, a quantitative prediction model for corrosion rate of natural gas pipeline based on adaptive neuro-fuzzy inference system (ANFIS) was established by fitting the experimental data which maps the relationship between the key influencing factors (i.e. CO2 partial pressure, H2S concentration, chloride concentration and tensile stress) and the corrosion rate. The prediction results show that the relative percentage errors of the predicted and experimental values are relatively small. The prediction accuracy of the model satisfies the engineering application requirement.

Corrosion Behavior of Pipeline Steel with Different Microstructures Under AC Interference in Acid Soil Simulation Solution

2019 ◽  
Vol 28 (3) ◽  
pp. 1698-1706 ◽  
Author(s):  
M. Zhu ◽  
Y. F. Yuan ◽  
S. M. Yin ◽  
G. H. Yu ◽  
S. Y. Guo ◽  
...  
Keyword(s):  
Corrosion Behavior ◽  
Pipeline Steel ◽  
Acid Soil ◽  
Ac Interference

Study of Electrochemical Behavior, Hydrogen Permeation and Diffusion in Pipeline Steel

2021 ◽  
Vol 1019 ◽  
pp. 145-156
Author(s):  
Swapna Dey ◽  
Seetharaman Sivaprasad ◽  
Nityananda Das ◽  
Indranil Chattoraj
Keyword(s):  
Corrosion Behavior ◽  
Hydrogen Permeation ◽  
Pipeline Steel ◽  
Electrochemical Corrosion ◽  
Hydrogen Distribution ◽  
X70 Pipeline Steel ◽  
Hydrogen Flux ◽  
Hydrogen Damage ◽  
Internal Surfaces ◽  
Neutral Soil

The pipeline steels which are used for transportation of natural gas and crude oil suffer from hydrogen damage at their internal as well as external surfaces. The internal surfaces of pipelines are generally affected due to hydrogen induced cracking and the external surfaces due to the soil environmental conditions which cause stress corrosion cracking. In the present investigation, the electrochemical corrosion behavior of X70 pipeline steel was studied in sour environment and near neutral soil environment. To assess the mechanism of hydrogen damage in steel, electrochemical hydrogen charging and permeation techniques were used to characterize the hydrogen distribution, trapping and its diffusion in X70 pipeline steel. It has been found that corrosion behavior of pipeline steel in the sour environment is higher than the near neutral soil solution. From the hydrogen permeation study it is established that the hydrogen permeation rate increases with the square root of the charging current density, and the increase of hydrogen flux is directly proportional to the subsurface hydrogen concentration.

Research on the Corrosion Behavior of X70 Pipeline Steel Under Coupling Effect of AC + DC and Stress

2019 ◽  
Vol 28 (4) ◽  
pp. 1958-1968 ◽  
Author(s):  
Xinhua Wang ◽  
Zuquan Wang ◽  
Yingchun Chen ◽  
Xuting Song ◽  
Cheng Xu
Keyword(s):  
Corrosion Behavior ◽  
Coupling Effect ◽  
Pipeline Steel ◽  
X70 Pipeline Steel
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