Effect of annealing temperature on the corrosion behavior of duplex stainless steel studied by in situ techniques

Guo, L. Q. and Li, M. and Shi, X. L. ORCID: https://orcid.org/0000-0003-0905-2547 and Yan, Y. and Li, X. Y. and Qiao, L. J. (2011) Effect of annealing temperature on the corrosion behavior of duplex stainless steel studied by in situ techniques. Corrosion Science, 53 (11). pp. 3733-3741. ISSN 0010-938X


Abstract

The effects of the annealing temperature on the microstructure and the corrosion behavior of duplex stainless steel 2507 were investigated by means of magnetic force microscopy (MFM), scanning Kelvin probe force microscopy (SKPFM), atomic force microscopy (AFM) and scanning electron microscopy (SEM). The SEM results indicated that the volume fraction of the austenite phase decreased with the increased annealing temperature. SKPFM/MFM measurements conducted in air at the room temperature and an ambient relative humidity of about 25% showed a higher Volta potential of the paramagnetic austenite than that of the ferromagnetic ferrite. The in situ AFM observation in a hydrochloric acid solution provided solid evidence that corrosion preferentially occurred in the ferrite phase. The sample annealed at 1100 °C exhibited a greater Volta potential difference between the ferrite and austenite and a higher corrosion rate in the ferrite, while that annealed at 1150 °C had a smaller Volta potential difference and a lower corrosion rate. The relative nobility and microstructure change of two phases, as well as their corrosion behavior, can be explained by the effect of the composition of alloying elements.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to Published version in accordance with the copyright policy of the publisher.
Faculty/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 15 Sep 2020 02:23
Last Modified: 15 Sep 2020 04:36
Uncontrolled Keywords: stainless steel; AFM: acid corrosion
Fields of Research (2008): 09 Engineering > 0912 Materials Engineering > 091205 Functional Materials
Fields of Research (2020): 40 ENGINEERING > 4016 Materials engineering > 401605 Functional materials
Identification Number or DOI: https://doi.org/10.1016/j.corsci.2011.07.019
URI: http://eprints.usq.edu.au/id/eprint/38921

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