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