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International Journal of Corrosion
Volume 2012, Article ID 651829, 10 pages
http://dx.doi.org/10.1155/2012/651829
Research Article

Determination of Susceptibility to Intergranular Corrosion of UNS 31803 Type Duplex Stainless Steel by Electrochemical Reactivation Method

1Department of Metallurgical & Materials Engineering, METU, 06531 Ankara, Turkey
2Department of Mechanical Engineering, Atılım University, Incek, 06836 Ankara, Turkey

Received 25 September 2011; Revised 10 December 2011; Accepted 19 December 2011

Academic Editor: Rokuro Nishimura

Copyright © 2012 Mehmet Emin Arıkan et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Specimens taken from a hot-rolled cylindrical duplex stainless steel (DSS) bar with 22% Cr grade were solution annealed at C and then aged at C from 100 to 31622 min for sensitization treatment. Double loop electrochemical potentiodynamic reactivation and standard weight loss immersion acid tests were conducted. The solution-annealed samples were found unsensitized. Those samples aged for 100 and 316 min were less sensitized whereas samples aged for 1000 min and especially those aged for 3162, 10000, and 31622 min were heavily sensitized. The degree of sensitization (DOS) can be attributed to higher contribution of chromium- and molybdenum-depleted areas resulting from intermetallic phases.