Corrosion Resistance of 2507 Duplex Stainless Steel in NaClO Solution
Yan ZHANG1,*(), Qian LI1, Sheng-gang WANG2
1 School of Science, Shenyang University of Technology, Shenyang 110870, China 2 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
Electrochemical potentiodynamic reactivation (EPR), potentiodynamic polarization curve and electrochemical impedance spectroscopy (EIS) methods were applied to investigate the intergranular corrosion and the pitting corrosion behaviors of 2507 duplex stainless steel (SAF2507), and the composition of the passive film formed on the corrosive surface of SAF2507 was studied by using the X-ray photoelectron spectrometer (XPS) analysis. The results show that the reactivation rate (Ra) of SAF2507 is 0.68%, which exhibits good intergranular corrosion resistance. The results of potentiodynamic polarization curve, and EIS show that the surface of SAF2507 can engender passivation phenomenon after polarization, the passivation range is -0.5-0.6V, and the charge transfer resistance is 1.389×104Ω·cm2, which shows better pitting corrosion resistance. XPS demonstrates that the composition of the passive film in 5g/L NaClO solution is mainly composed of oxides and hydrogen oxygen compounds of Cr and Fe. Meanwhile, the corrosion mechanism of SAF2507 was further explored.
KRASNORUTSKYI S, PRIES H, ZINKE M, et al Metallurgical influence of multi-beam technology on duplex stainless steel welds[J]. Welding in the World, 2013, 57 (4): 487- 494.
2
CALLIARI I, PELLIZZARI M, ZANELLATO M, et al The phase stability in Cr-Ni and Cr-Mn duplex stainless steels[J]. Journal of Materials Science, 2011, 46 (21): 6916- 6924.
3
KOLENI Č I F, KOVAC D I L, DRIMAL D I D Effect of laser welding conditions on austenite/ferrite ratio in duplex stainless steel 2507 welds[J]. Welding in the World, 2011, 55 (5): 19- 25.
4
WANG X, CHEN W, ZHENG H Influence of isothermal aging on σ precipitation in super duplex stainless steel[J]. International Journal of Minerals, Metallurgy, and Materials, 2010, 17 (4): 435- 440.
5
CHEN X, REN X, XU H, et al Effect of super plastic deformation on the bonding property of 00Cr25Ni7Mo3N duplex stainless steel[J]. International Journal of Minerals, Metallurgy, and Materials, 2012, 19 (4): 317- 321.
XU Ju-liang, DENG Bo, SUN Tao, et al Evaluation of the susceptibility to intergranular attack of 2205 duplex stainless steel by DL-EPR method[J]. Acta Metallurgica Sinica, 2010, 46 (3): 380- 384.
GUO Li-fang, LI Xu-yan, SUN Tao, et al The influence of sensitive temperature on the localized corrosion resistance of duplex stainless steel SAF2304[J]. Acta Metallurgica Sinica, 2012, 48 (12): 1503- 1509.
8
DONG C F, LUO H, XIAO K, et al Effect of temperature and Cl- concentration on pitting of 2205 duplex stainless steel[J]. Journal of Wuhan University of Technology-Materials Science Edition, 2011, 26 (4): 641- 647.
9
YANG Y H, YAN B, YIN J L, et al Microstructure and corrosion behavior aging at 750℃ in 25% Cr duplex stainless steel[J]. Rare Metals, 2011, 30 (9): 515- 519.
10
DABALÃ M, CALLIARA I, VARIOLA A Corrosion behavior of a super duplex stainless steel in chloride aqueous solution[J]. Journal of Materials Engineering and Performance, 2004, 13 (2): 237- 240.
ZHANG Min, ZHANG En-hua, MENG Qiang, et al Effect of corrosive medium on the corrosion resistance of duplex stainless steel[J]. Ordnance Material Science and Engineering, 2011, 34 (6): 40- 43.
13
YOUSEFIEH M, SHAMANIAN M, SAATCHI A Influence of step annealing temperature on the microstructure and pitting corrosion resistance of SDSS UNS S32760 welds[J]. Journal of Materials Engineering and Performance, 2011, 20 (9): 1678- 1683.
14
YONG T S, SHIN H S, LEE H W Effects of heat input on pitting corrosion in super duplex stainless steel weld metals[J]. Metals and Materials International, 2012, 18 (6): 1037- 1040.
15
DONIKČ, KOCIJAN A, MANDRINO D, et al X-ray photoelectron spectroscopy depth profiling of electrochemically prepared thin oxide layers on duplex stainless steel[J]. Metallurgical and Materials Transactions B, 2011, 42 (5): 1044- 1050.
XIANG Hong-liang, HE Fu-shan, LIU Dong Corrosion compositions on surface after electrochemical polarization of duplex stainless cast steel by XPS[J]. Journal of Chinese Society for Corrosion and Protection, 2010, 30 (4): 288- 294.
17
GAO Z, CHEN F, ZHAO C Comparing different criteria of EPR method to evaluate the susceptibility to intergranular corrosion[J]. Journal of Chinese Society for Corrosion and Protection, 2000, 20 (4): 247- 251.
LI Shen-su Examination of sensitization of austenitic stainless steels by double-loop EPR test method[J]. Corrosion Science and Protection Technology, 2000, 12 (5): 288- 291.
19
HONG J F, HAN D, TAN H, et al Evaluation of aged duplex stainless steel UNS S32750 susceptibility to intergranular corrosion by optimized double loop electrochemical potentiokinetic reactivation method[J]. Corrosion Science, 2013, 68, 249- 255.
CHEN Hai-yan, LIN Zhen-long, CHEN Pi-mao, et al Electrochemical corrosion behavior of copper in marine microbial medium[J]. Journal of Materials Engineering, 2014, (7): 22- 27.
ZENG Hong-tao, XIANG Song, LIU Song-lin, et al Corrosion behaviors of 904L austenite stainless steel in concentrated sulfuric acid containing hydrofluoric acid[J]. Journal of Chinese Society for Corrosion and Protection, 2013, 33 (3): 182- 187.
22
SÁNCHEZ M, GREGORI J, ALONSO C, et al Electrochemical impedance spectroscopy for studying passive layers on steel rebars immersed in alkaline solutions simulating concrete pores[J]. Electrochimica Acta, 2007, 52 (27): 7634- 7641.
23
El-EGAMY S S, BADAWAY W A Passivity and passivity breakdown of 304 stainless steel in alkaline sodium sulphate solutions[J]. Journal of Applied Electrochemistry, 2004, 34 (11): 1153- 1158.
DU Nan, YE Chao, TIAN Wen-ming, et al 304 stainless steel pitting behavior by means of electrochemical impedance spectroscopy[J]. Journal of Materials Engineering, 2014, (6): 68- 73.
WANG Zhou-cheng, ZHANG Ying-zhou, ZHOU Shao-min, et al Corrosion compositions of carbon steel under ion-selective coatings by XPS[J]. Journal of Chinese Society for Corrosion and Protection, 2001, 21 (5): 273- 279.