Effects of Moderate Temperature Aging Treatment on Corrosion Resistance of SAF2304 DuplexStainless Steel

doi:10.11902/1005.4537.2019.216

Journal of Chinese Society for Corrosion and protection

2020, Vol. 40

Issue (1): 51-56 DOI: 10.11902/1005.4537.2019.216

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Effects of Moderate Temperature Aging Treatment on Corrosion Resistance of SAF2304 DuplexStainless Steel

WU Dongcai,HAN Peide(

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Key Laboratory of Interface Science and Engineering in Advanced Materials, College of Materials Science and Engineering，Taiyuan University of Technology, Taiyan 030024, China

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Abstract

The microstructure and corrosion resistance of SAF2304 duplex stainless steel after aging treatment for 2 h at 600, 650, 700, 750 and 800 ℃, as well as at 700 ℃ for 0.25, 0.5,1, 2, 3, 4 and 5 h respectively were characterized by means of optical microscopy (OM), electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization measurement. The results showed that with the increasing aging temperature, the amount of secondary phase precipitated at grain-boundaries of ferrite/austenite increased and the maximum value of which emerged at 700 ℃ sharply, correspondingly the steel after solution treated at 1050 ℃ for 1 h and aged at 700 ℃ for 2 h showed the worst corrosion resistance. Therefore, the SAF2304 duplex stainless steel is sensitive to the aging treatment at 700 ℃ in terms of the secondary phase precipitation and corrosion resistance. For the steel aged at 800 ℃, the precipitated phase was rarely observed, and its corrosion resistance was enhanced. Furthermore, with the increasing time for the aging at 700 ℃, precipitates of secondary phase increased sharply, while the formed passivation film became poor and poor in compactness and uniformity, so as the corrosion resistance of the steel.

Key words: duplex stainless steel 2304 precipitated phase aging treatment corrosion resistance sensitive temperature

Received: 05 July 2019

ZTFLH:

TG174

Fund: National Natural Science Foundation of China(51371123);Univesty Doctoral subject Key Doctoral Mentor Foundation Projects(2013140211003);Natural Science Foundation of Shanxi(2014011002)

Corresponding Authors: Peide HAN E-mail: hanpeide@126.com

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Cite this article:

WU Dongcai,HAN Peide. Effects of Moderate Temperature Aging Treatment on Corrosion Resistance of SAF2304 DuplexStainless Steel. Journal of Chinese Society for Corrosion and protection, 2020, 40(1): 51-56.

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https://www.jcscp.org/EN/10.11902/1005.4537.2019.216 OR https://www.jcscp.org/EN/Y2020/V40/I1/51

Fig.1 OM images of the solid solution treated specimen at 1050 ℃ for 1 h (a) and specimens annealed after solid solution treated at 600 ℃/2 h (b), 650 ℃/2 h (c), 700 ℃/2 h (d), 750 ℃/2 h (e) and 800 ℃/2 h (f)

Fig.2 Anodic polarization curves of SAF2304 steel with different aging temperatures in 3.5%NaCl solution

Fig.3 OM images of the annealed specimens after solid solution treated at 0.25 h (a), 0.5 h (b), 1 h (c), 2 h (d), 3 h (e), 4 h (f) and 5 h (g)

Fig.4 Anodic polarization curves of SAF2304 steel with different aging times at 700 ℃ in 3.5%NaCl solution

Fig.5 Electrochemical impedance spectroscopy curves of SAF2304 steel with different aging times at 700 ℃ in 3.5%NaCl solution

Fig.6 Equivalent circuit diagram from electrochemical impedance spectroscopy curves of the SAF2304 steel with different aging times at 700 ℃ in 3.5% NaCl solution

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