Effects of alternating current interference on corrosion of X60 pipeline steel

With rapid economic development in China, demand for energy and transportation is growing. Due to the limitations of factors such as terrain and traffic, a large number of buried oil and gas pipelines are parallel to high-voltage transmission lines and electrified railways over long distances. Alternating current (AC) corrosion of pipelines is very serious in such cases. In this work, laboratory experiments were carried out with an electrochemical method in a simulated soil solution at various AC current densities from 0 to 200 A/m2 and AC frequencies from 10 to 200 Hz. Experimental results indicated that with an increase in the AC current density, the corrosion potential of an X60 steel electrode shifted negatively, the anodic current density increased significantly, and the corrosion rate increased. Moreover, with an increase in the AC frequency, the corrosion potential of the X60 electrode shifted positively and the anodic current density decreased, which led to a decrease in the corrosion rate. Furthermore, the morphology of X60 electrodes indicated that uniform corrosion occurred at a low AC current density; while corrosion pits were found on the X60 electrode surface at a high AC current density, and deep corrosion pits seriously damaged the pipelines and might lead to leakage.

[1]  S. Lalvani,et al.  Corrosion of mild steel subjected to alternating voltages in seawater , 1994 .

[2]  S. Lalvani,et al.  A theoretical approach for predicting AC-induced corrosion , 1994 .

[3]  S. Lalvani,et al.  The corrosion of carbon steel in a chloride environment due to periodic voltage modulation: Part I , 1995 .

[4]  F. Kajiyama,et al.  Effect of Induced Alternating Current Voltage on Cathodically Protected Pipelines Paralleling Electric Power Transmission Lines , 1999 .

[5]  Svein Eliassen,et al.  Corrosion Management of Buried Pipelines Under Difficult Operational and Environmental Conditions , 2000 .

[6]  Young Tai Kho,et al.  Competition of AC and DC Current in AC Corrosion Under Cathodic Protection , 2002 .

[7]  Neil G. Thompson,et al.  AC Corrosion: Mechanism and Proposed Model , 2004 .

[8]  Robert G. Wakelin,et al.  Investigation and Mitigation of AC Corrosion on a 300 MM Natural Gas Pipeline , 2004 .

[9]  Henrik Rosenberg,et al.  AC Induced Corrosion in Pipelines: Detection, Characterization and Mitigation , 2004 .

[10]  Yoon-Cheol Ha,et al.  Alternating current induced corrosion , 2004 .

[11]  L. V. Nielsen,et al.  Sensor Technology for On-Line Monitoring of AC Induced Corrosion Along Pipelines , 2005 .

[12]  Christopher Movley.  Pipeline Corrosion From Induced A.C. , 2005 .

[13]  Luciano Lazzari,et al.  Influence of AC on Corrosion Kinetics for Carbon Steel, Zinc and Copper , 2005 .

[14]  H. Takenouti,et al.  Harmonic Analysis Study of the AC Corrosion of Buried Pipelines Under Cathodic Protection , 2007 .

[15]  Y. Ha,et al.  Influence of alternating, direct and superimposed alternating and direct current on the corrosion of mild steel in marine environments , 2007 .

[16]  Mohammed A. Amin,et al.  On the corrosion inhibition of low carbon steel in concentrated sulphuric acid solutions. Part I: Chemical and electrochemical (AC and DC) studies , 2008 .

[17]  M. Büchler,et al.  Investigation of Alternating Current Corrosion of Cathodically Protected Pipelines: Development of a Detection Method, Mitigation Measures, and a Model for the Mechanism , 2009 .

[18]  Y. F. Cheng,et al.  Effects of alternating current on corrosion of a coated pipeline steel in a chloride-containing carbonate/bicarbonate solution , 2010 .

[19]  L. Lazzari,et al.  AC corrosion - Part 1: Effects on overpotentials of anodic and cathodic processes , 2010 .

[20]  Luciano Lazzari,et al.  AC corrosion. Part 2: Parameters influencing corrosion rate , 2010 .

[21]  Yang Yan.  Mechanism,influence factors and risk evaluation of metal alternating current corrosion , 2011 .

[22]  Weng Yong-ji.  CARBON STEEL CORROSION INDUCED BY ALTERNATING CURRENT , 2011 .

[23]  M. Ormellese,et al.  Effect of AC interference on cathodic protection monitoring , 2011 .

[24]  Y. F. Cheng,et al.  Development of a real-time AC/DC data acquisition technique for studies of AC corrosion of pipelines , 2012 .

[25]  M. Büchler,et al.  Alternating current corrosion of cathodically protected pipelines: Discussion of the involved processes and their consequences on the critical interference values , 2012 .

[26]  Y. F. Cheng,et al.  Effect of alternating current on corrosion and effectiveness of cathodic protection of pipelines , 2012 .

[27]  Y. F. Cheng,et al.  Effect of alternating current on cathodic protection on pipelines , 2013 .

[28]  Yang Yan,et al.  EFFECTS OF ALTERNATING CURRENT ON X70 STEEL MORPHOLOGY AND ELECTROCHEMICAL BEHAVIOR , 2013 .

[29]  Dawei Zhang,et al.  Effect of AC current density on stress corrosion cracking behavior of X80 pipeline steel in high pH carbonate/bicarbonate solution , 2014 .

[30]  Yanxia Du,et al.  Effect of AC current on corrosion behavior of cathodically protected Q235 steel , 2015 .

[31]  梶山 文夫,et al.  NACE SP0169 Control of External Corrosion on Underground or Submerged Metallic Piping Systemsの改訂 , 2015 .