期刊
ELECTROCHIMICA ACTA
卷 54, 期 23, 页码 5387-5392出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2009.04.023
关键词
Duplex stainless steel; Pitting corrosion; Annealing treatment; Polarization; Critical pitting temperature
资金
- National Natural Science Foundation of China [10621063, 50871031]
- Chinese National Science and Technology Infrastructure Platforms Construction Project [2005DKA10400-Z13]
- Shanghai Science and Technology Development Funds [0725nm004]
- China Postdoctoral Science Foundation [20080430670]
- Shanghai Leading Academic Discipline Project [B113]
The effect of annealing temperatures in the range 1000-1200 degrees C on the microstructure and corrosion behavior of 2101 lean duplex stainless steel was investigated. The results demonstrated that the volume fraction of austenite phase decreased with increasing annealing temperature. However, lower values for the pitting potential (E-pit) and the critical pitting temperature (CPT) were obtained after annealing at higher temperatures. Pitting was initiated preferentially in the ferrite/austenite boundaries or inside the ferrite domains, indicating that the ferrite phase had inferior pitting corrosion resistance as compared to the austenite phase in as-received steel. Moreover, the PRE values of the ferrite phase fell with the annealing temperature, while the values for the austenite phase rose. No equal PRE values in the ferrite and austenite phase were found for this steel in the range of annealing temperatures. This was determined by evaluating the PRE values of both phases from EDS results and the Thermo-Calc database. (C) 2009 Elsevier Ltd. All rights reserved.
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