Monday, March 17, 2008 - 3:45 PM
Convention Center, Second Level R02 (Ernest N. Morial Convention Center)
08102

Electrochemical Behavior of Low C - 13%Cr Welded Joints by Using Solution Flow Type Micro-Droplet Cell

Shuji Hashizume, Tenaris NKKTubes; Toshiya Nakayama, Masatoshi Sakairi, and Koji Fushimi, Hokkaido University

Low Carbon-13%Cr martensitic stainless steels have been widely used for line pipe application because of their high strength and excellent corrosion resistance in corrosive conditions.  Recently, both laboratory and field experiences related to cracking near fusion line of these steels weld joints in hot acid environments has been published.  Electrochemical analysis of weld joints are expected to be effective to understanding crack mechanism.  In this paper, electrochemical behavior of low C – 13%Cr welded joints was measured by using solution flow type micro-droplet cell.  In this unique technique, a droplet with a diameter of hundreds of micrometers is used as an electrochemical cell and this technique enables local electrochemical measurements.
Measurement of corrosion potentials and potentiodynamic polarization for HAZ portion of welded joints were focused.

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