| ZHANG Dong-hai,LIU Rui,CHENG Cong-qian,ZHAO Jie.Effect of Tensile Stress on Pitting Resistance of 2205 Duplex Stainless Steel[J],45(3):12-16,126 |
| Effect of Tensile Stress on Pitting Resistance of 2205 Duplex Stainless Steel |
| Received:December 01, 2015 Revised:March 20, 2016 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2016.03.003 |
| KeyWord:2205 duplex stainless steel, tensile stress, pitting, electrochemical impedance spectroscopy, potentialdynamic polarization, critical pitting temperature |
| Author | Institution |
| ZHANG Dong-hai |
School of Material Science and Engineering, Dalian University of Technology, Dalian , China |
| LIU Rui |
School of Material Science and Engineering, Dalian University of Technology, Dalian , China |
| CHENG Cong-qian |
School of Material Science and Engineering, Dalian University of Technology, Dalian , China |
| ZHAO Jie |
School of Material Science and Engineering, Dalian University of Technology, Dalian , China |
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| Abstract: |
| Objective Effects of tensile stress on pitting-resistance of 2205 duplex stainless steel was studied. Methods the characteristic of potentiodynamic polarization was investigated under different elastic tensile of 0MPa, 140MPa and 540MPa in 3.5%NaCl solution below the critical pitting temperature of 40 ℃ and around the temperature of 60 ℃. The electrochemical impedance spectra (EIS) were also carried out at the same condition. Results the potentialdynamic polarization curves show a relative stable pitting potential under condition of 140MPa, which is about 0.7V(SCE) and 0.8V(SCE) at 40℃ and 60℃, respectively. However, applying tensile stress of 540MPa significantly decreased the pitting potential from 1.0V (SCE) to 0.3V (SCE). The electrochemical impedance spectra (EIS) exhibits single impedance arc with high value of electric resistance, and the resistance is decreased by applying stress. As temperature was increased up to 60℃, high value of impedance resistance was achieved under stress of 0 and 140 MPa, while a pitting initiation characterization was observed for the EIS under 540 MPa at OCP. At bias polarization of 600mV（SCE）, the pitting arcs was observed under 0MPa and 540MPa, but the resistance under 140MPa is still high. The fitting results by using equilibrium circuit plots show that resistance of the passive film Rp was not significantly affected by applying tensile stresses at condition of 40℃ and OCP, while the resistance of passive film is reduced from about 30000Ω•cm2 at 0MPa to about 10000Ω•cm2 at 540mV(SCE). At the temperature of 60℃, the resistance of passive film decreases significantly. The application 540MPa stress significantly decreases the electron transfer resistance below 5000Ω•cm2, but high value of the resistance still maintained under the condition of 140MPa. Conclusions At 40℃ and 60℃, the pitting-resistant of 2205 duplex steel was firstly improved and then deteriorated with the increase of tensile stress, where the pitting can be inhibited at the condition of 140MPa. |
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