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Correlation between AC magnetic susceptibility and pitting behaviour of sigma-phase containing duplex stainless steel

Kin Ho Lo (Department of Electromechanical Engineering, The University of Macau, Macau, China and Institute of Applied Physics and Materials Engineering. The University of Macau, Macau, China)
Chi Tat Kwok (Department of Electromechanical Engineering, The University of Macau, Macau, China and Institute of Applied Physics and Materials Engineering. The University of Macau, Macau, China)
Hong Cheng Kuan (Department of Electromechanical Engineering, The University of Macau, Macau, Macau AND Honours College, The University of Macau, Macau, Macau.)
Weng Kin Chan (Department of Electromechanical Engineering, The University of Macau, Macau, Macau.)
Wenji Ai (Department of Electromechanical Engineering, The University of Macau, Macau, Macau.)

Anti-Corrosion Methods and Materials

ISSN: 0003-5599

Article publication date: 2 November 2015

160

Abstract

Purpose

The purpose of this paper is to characterize the pitting behaviour of sigma-phase-containing duplex stainless steel and investigate the correlation between magnetic susceptibility and pitting potentials.

Design/methodology/approach

Use an alternating current (AC) magnetic susceptometer to trace the change in magnetic susceptibility associated with sigma phase formation and systematic study of the effects of sigma precipitation on pitting parameters as obtained using the anodic potentiodynamic polarization test.

Findings

The precipitation of sigma phase impairs the general and pitting corrosion resistance of duplex stainless steel. The pitting potential, the corrosion potential and the AC magnetic susceptibility have good correlations. Unlike the pitting potential and the corrosion potential, the passive current and the corrosion current do not seem to possess any trend with annealing time.

Originality/value

The correlation between AC magnetic susceptibility and pitting parameters has not been reported in the literature before.

Keywords

Acknowledgements

The present work was financially supported by Fundo para o Desenvolvimento das Ciências e da Tecnologia (FDCT) (Grant Nos.: 069/2012/A3 and 070/2011/A3, with the latter supporting X-ray diffraction experiments).

Citation

Lo, K.H., Kwok, C.T., Kuan, H.C., Chan, W.K. and Ai, W. (2015), "Correlation between AC magnetic susceptibility and pitting behaviour of sigma-phase containing duplex stainless steel", Anti-Corrosion Methods and Materials, Vol. 62 No. 6, pp. 371-378. https://doi.org/10.1108/ACMM-10-2013-1304

Publisher

:

Emerald Group Publishing Limited

Copyright © 2015, Emerald Group Publishing Limited

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