Effect of cathodic protection potential fluctuations on pitting corrosion of X100 pipeline steel in acidic soil environment

2018 ◽  
Vol 143 ◽  
pp. 428-437 ◽  
Author(s):  
Mingjie Dai ◽  
Jing Liu ◽  
Feng Huang ◽  
Yaohua Zhang ◽  
Y. Frank Cheng
Keyword(s):  
Cathodic Protection ◽  
Pitting Corrosion ◽  
Pipeline Steel ◽  
Acidic Soil ◽  
Soil Environment ◽  
Potential Fluctuations ◽  
X100 Pipeline Steel ◽  
Protection Potential

scholarly journals Effect of Sulfate-Reducing Bacteria (SRB) on the Corrosion of Buried Pipe Steel in Acidic Soil Solution

Coatings ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 625
Author(s):  
Lijuan Chen ◽  
Bo Wei ◽  
Xianghong Xu
Keyword(s):  
Soil Solution ◽  
Steel Surface ◽  
Pipeline Steel ◽  
Electrochemical Techniques ◽  
Sulfate Reducing Bacteria ◽  
Acidic Soil ◽  
Microbiologically Influenced Corrosion ◽  
Soil Environment ◽  
Sulfate Reducing ◽  
Reducing Bacteria

The influence of sulfate-reducing bacteria (SRB) on the corrosion behaviors of X80 pipeline steel was investigated in a soil environment by electrochemical techniques and surface analysis. It was found that SRB grew well in the acidic soil environment and further attached to the coupon surface, resulting in microbiologically influenced corrosion (MIC) of the steel. The corrosion process of X80 steel was significantly affected by the SRB biofilm on the steel surface. Steel corrosion was inhibited by the highly bioactive SRB biofilm at the early stage of the experiment, while SRB can accelerate the corrosion of steel at the later stage of the experiment. The steel surface suffered severe pitting corrosion in the SRB-containing soil solution.

Effect of inclusions on initiation of stress corrosion cracks in X70 pipeline steel in an acidic soil environment

2009 ◽  
Vol 51 (4) ◽  
pp. 895-900 ◽  
Author(s):  
Z.Y. Liu ◽  
X.G. Li ◽  
C.W. Du ◽  
L. Lu ◽  
Y.R. Zhang ◽  
...  
Keyword(s):  
Stress Corrosion ◽  
Pipeline Steel ◽  
Acidic Soil ◽  
Soil Environment ◽  
X70 Pipeline Steel

Corrosion of Pipeline Steel in the Presence of Alternating Current and the New CP Recommendation

2010 ◽  
Author(s):  
A. Q. Fu ◽  
Y. F. Cheng
Keyword(s):  
Corrosion Rate ◽  
Current Density ◽  
Cathodic Protection ◽  
Pitting Corrosion ◽  
Pipeline Steel ◽  
Alternating Current ◽  
National Association ◽  
Ac Current ◽  
Ac Interference ◽  
Full Protection

The alternating current (AC)-induced corrosion of a cathodically protected X65 pipeline steel was studied in a high pH, concentrated carbonate/bicarbonate solution. Results demonstrated that the corrosion rate of the steel increases with the AC current density, and AC interference could increase the pitting corrosion of the steel. In the absence of AC interference or at a low AC current density, i.e., 20 A/m2, a cathodic protection (CP) potential of −950 mV(Cu/CuSO4 electrode, CSE), which is 100 mV more cathodic than −850 mV(CSE) recommended by National Association of Corrosion Engineers (NACE), provides a full protection over the steel. When the AC current density is higher than 20 A/m2, the NACE-recommended CP is incapable of protecting the pipeline from corrosion. A new CP standard is thus developed for recommendation to industry to avoid AC corrosion of pipelines.

scholarly journals Synergistic protective effect of carboxymethyl chitosan and cathodic protection of X70 pipeline steel in seawater

RSC Advances ◽  
2017 ◽  
Vol 7 (6) ◽  
pp. 3419-3427 ◽  
Author(s):  
Panpan Feng ◽  
Kai Wan ◽  
Guowei Cai ◽  
Lihui Yang ◽  
Yantao Li
Keyword(s):  
Protective Effect ◽  
Corrosion Inhibition ◽  
Cathodic Protection ◽  
Pipeline Steel ◽  
Carboxymethyl Chitosan ◽  
X70 Pipeline Steel ◽  
Protection Potential ◽  
Inhibition Performance

This study has investigated corrosion inhibition performance on X70 pipeline steel in seawater using carboxymethyl chitosan (CMCS) and Na2WO4 at a cathodic protection potential of −0.85 V (vs. SCE).

Residual Stress Assessment and its Effect on SCC of Pipelines Steel in Acidic Soil Environment

2014 ◽  
Vol 1616 ◽  
Author(s):  
A. Contreras ◽  
L.M. Quej-Ake ◽  
R. Galvan-Martinez ◽  
O. Vega
Keyword(s):  
Mechanical Properties ◽  
Residual Stresses ◽  
Soil Solution ◽  
Pipeline Steel ◽  
Acidic Soil ◽  
Soil Environment ◽  
X Ray Diffraction ◽  
X Ray ◽  
Welding Joints ◽  
Internal Side

ABSTRACTEffect of residual stresses of multiple welding repairs on API 5L X52 pipeline steel on stress corrosion cracking (SCC) in a simulated acidic soil solution was studied. Four conditions of repairs of the girth weld were evaluated. The residual stresses were measured through X-ray diffraction (XRD) on the internal side of the pipe in longitudinal and circumferential direction. The circumferential and longitudinal residual stresses values are compressive on the inner surface of the welding joints. The highest residual stresses were measured in the hoop direction reaching values of about 98% of the yielding strength (360 MPa). It was observed that its magnitude increases as move away from weld center line. The effect of residuals stresses in the SCC susceptibility of X52 pipeline steel was evaluated through slow strain rate tests (SSRT) in a simulated acidic soil solution. Relation between mechanical properties obtained from SSRT and residual stresses on the SCC susceptibility was analyzed. Results of SCC index taking account the ratios obtained from the mechanical properties of the welding joints evaluate, showed good SCC resistance in acidic soil solution at low pH. Scanning electron microscopy (SEM) observations showed that the region with high residual stresses prior to generate cracks in the steel due to the combination of soil solution and the strain exerted, should favor pitting formation and not cracking.

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