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Effects of Moderate Temperature Aging Treatment on Corrosion Resistance of SAF2304 DuplexStainless Steel |
WU Dongcai,HAN Peide() |
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.
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Received: 05 July 2019
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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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