Corrosion Behavior of Welded Joints of X70 Pipeline Steel Produced by High-frequency Welding
Anatolii Klymenko *
Department of Welding of Pipes of Gas and Oil Pipelines, E. O. Paton Electric Welding Institute, National Academy of Sciences of Ukraine, Kyiv, Ukraine.
Svetlana Kovalenko
Department of Welding of Pipes of Gas and Oil Pipelines, E. O. Paton Electric Welding Institute, National Academy of Sciences of Ukraine, Kyiv, Ukraine.
Vitalii Kuzmenko
Department of Welding of Pipes of Gas and Oil Pipelines, E. O. Paton Electric Welding Institute, National Academy of Sciences of Ukraine, Kyiv, Ukraine.
Yurii Kovalenko
Department of Chemical Technology of Composite Materials, National Technical University of Ukraine, Igor Sikorsky Kyiv Polytechnic Institute, Kyiv, Ukraine.
*Author to whom correspondence should be addressed.
Abstract
Corrosion behavior of welded joints of steel pipe category X70 produced by high-frequency welding, in different conditions, in which it is possible to initiate stress-corrosion cracking, hydrogen or sulfide cracking, was investigated. According to the results of electrochemical researches, the kinetic parameters of the cathode and anode processes on the surface of the welded joint of pipe in the investigated solutions are determined. Corrosion resistance of the welded joint HFW-pipe is similar to corrosion resistance of the base metal.
Keywords: Pipe, high-frequency welding, corrosion, stress-corrosion cracking, corrosion potential.