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| Pitting corrosion resistance of hot stamping forming SAF2507 SDSS in different solutions |
| ZHANG Yu-zhu1, LAN Jian-feng1, MO Qian2, HU Shan3 |
1. Academic of Intelligent Engineering of College of Mobile Telecommunications, Chongqing University of Posts and Telecommunications, Chongqing 401520, China;
2. No.2 Branch Factory, Chongqing Wangjiang Industry Co., Ltd., Chongqing 400071, China;
3. Institute of New Energy and Vehicle, Nanchang Institute of Science and Technology, Nanchang 330108, Jiangxi, China |
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Abstract In order to research the influence of anions on pitting corrosion resistance of SAF2507 SDSS after hot stamping forming in different service environments,SAF2507 SDSS plates were subjected to hot stamping forming at 1 050 ℃. The phases and chemical composition were observed and tested by using ZEISS-SUPRA55 scanning electron microscope and energy dispersive spectrometer. The pitting corrosion resistance of SAF2507 SDSS in 3.5% NaClO and sodium halide (NaX,X=Cl,Br,and I) solutions by mass were investigated by means of potentiodynamic polarization curves,open circuit potentials and AC impedance spectroscopy. The results show that the microstructure of SAF2507 SDSS of hot stamping forming at 1 050 ℃ is favorable and the volume ratio of α/γ is about 1∶1. The potential of α phase which is riched in Cr,Mo and depleted in Ni is lower than γ phase as the anode during the corrosion process. In four aggressive solutions,the pitting corrosion resistance from high to low is NaClO,NaCl,NaBr,and NaI. The number of pitting cavities in the NaClO solution are least,and the size of pitting cavities are small and shallow. In contrast,The number of pitting cavities in the NaI solution are maximum and the size of pitting cavities are large and deep. The ClO- ions inhibit the nucleation and growth of pittings and the Cl-,Br-,and I- ions only promote the nucleation of pittings,and the influence from high to low is I-,Br-,and Cl-.
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Received: 29 November 2019
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2020, Vol. 55 
