张东海,刘睿,程从前,赵杰.拉应力对2205双相不锈钢耐点蚀性能的影响[J].表面技术,2016,45(3):12-16,126.
ZHANG Dong-hai,LIU Rui,CHENG Cong-qian,ZHAO Jie.Effect of Tensile Stress on Pitting Resistance of 2205 Duplex Stainless Steel[J].Surface Technology,2016,45(3):12-16,126 |
| 拉应力对2205双相不锈钢耐点蚀性能的影响 |
| Effect of Tensile Stress on Pitting Resistance of 2205 Duplex Stainless Steel |
| 投稿时间：2015-12-01 修订日期：2016-03-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2016.03.003 |
| 中文关键词: 双相不锈钢 拉应力 点蚀 电化学阻抗谱 动电位极化 临界点蚀温度 |
| 英文关键词:2205 duplex stainless steel, tensile stress, pitting, electrochemical impedance spectroscopy, potentialdynamic polarization, critical pitting temperature |
| 基金项目:国家自然科学基金(51571051, 51101024, 51171037) |
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| Author | Institution |
| ZHANG Dong-hai | School of Material Science and Engineering, Dalian University of Technology, Dalian 116023, China |
| LIU Rui | School of Material Science and Engineering, Dalian University of Technology, Dalian 116023, China |
| CHENG Cong-qian | School of Material Science and Engineering, Dalian University of Technology, Dalian 116023, China |
| ZHAO Jie | School of Material Science and Engineering, Dalian University of Technology, Dalian 116023, China |
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| 中文摘要: |
| 目的 研究拉应力对2205双相不锈钢耐点蚀性能的影响。方法 分析了0MPa、140MPa和540MPa三种不同拉应力对临界点蚀温度以下40℃和临界点蚀温度附近60℃的3.5%NaCl溶液中动电位极化行为,并对比了不同拉应力对2205双相钢阻抗特性的影响。结果 动电位极化曲线表明,140MPa下点蚀电位稳定,40℃和60℃下分别为0.7V(SCE)和0.8V(SCE)；540MPa拉应力使双相钢点蚀电位从1.0 V(SCE)下降至0.3V(SCE)。阻抗结果表明,40℃时所有样品均为单一阻抗特征,且阻抗值较大,应力降低阻抗值。当温度为60℃时,开路电位下0MPa和140MPa下具有较高阻抗,540MPa下为具有点蚀萌生的阻抗弧；在600mV(SCE)偏压条件下,0MPa和540MP呈现点蚀阻抗特征,而140MPa下阻抗仍较高；阻抗谱的等效电路图拟合结果表明,40℃溶液中OCP下应力对钝化膜电阻Rp没有明显影响,在600mV(SCE)偏压540MPa应力条件下不锈钢发生点蚀,阻抗值由0MPa下的30000Ω.cm2左右降到10000Ω.cm2左右。温度升高至60℃,钝化膜阻值明显降低；540MPa拉应力下电阻值明显降低,且发生点蚀时电荷转移总电阻值低于5000Ω.cm2,而相同条件下140MPa拉应力下电荷转移电阻值仍然较高。结论 在40℃和60℃,2205双相钢耐点蚀性能随拉应力先增加后降低,140MPa拉应力可抑制点蚀的发生。 |
| 英文摘要: |
| 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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