Applied Surface Science 360 (2016) 921–928 Contents lists available at ScienceDirect Applied Surface Science journal homepage: www.elsevier.com/locate/apsusc Inﬂuence of grain reﬁnement on the electrochemical behavior of AISI 430 ferritic stainless steel in an alkaline solution A. Fattah-alhosseini, S. Vafaeian Department of Materials Engineering, Bu-Ali Sina University, Hamedan 65178-38695, Iran article info abstract Article history: In this paper, the effect of grain reﬁnement on the electrochemical behavior of AISI 430 ferritic stain- Received 21 May 2015 less steel in 0.1 M NaOH solution was investigated. Potentiodynamic polarization curves showed that Received in revised form 18 October 2015 ﬁne-grained samples have less corrosion potential, higher corrosion current density, and less protec- Accepted 8 November 2015 tive passive ﬁlm in comparison to coarse-grained samples. Electrochemical impedance spectroscopy Available online 14 November 2015 (EIS) analysis revealed that implementing the thermomechanical operation led to lower polarization resistance. Also, Mott–Schottky analysis revealed that the passive ﬁlms on both ﬁne-grained and coarse- Keywords: grained samples behave as n-type and p-type semiconductors and the semiconductor character of the Grain reﬁnement passive ﬁlms did not change by grain reﬁnement. Moreover, it was found that the calculated donor Thermomechanical and acceptor densities increased with grain reﬁnement. Thus, the presented
Applied Surface Science – Elsevier
Published: Jan 1, 2016
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