2507双相不锈钢在NaClO溶液中的腐蚀性能

doi:10.11868/j.issn.1001-4381.2016.01.017

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摘要

采用电化学动电位再活化法(EPR)、动电位极化和交流阻抗测试方法(EIS)研究2507双相不锈钢(SAF2507)在5g/L NaClO溶液中的晶间腐蚀和点腐蚀行为,并采用X射线光电子能谱(XPS)研究SAF2507腐蚀后表面形成的钝化膜组成。结果表明:SAF2507的再活化率R_a为0.68%,具有良好的耐晶间腐蚀性能;动电位极化和EIS的测试结果表明:SAF2507极化后能够发生自钝化现象,钝化区间为-0.5~0.6V;电荷传递电阻为1.389×10⁴Ω·cm²,说明其具有较强的耐点腐蚀性能。XPS研究表明SAF2507在5g/L NaClO溶液中钝化膜主要成分为Cr,Fe等氧化物和氢氧型化合物。同时进一步探讨了SAF2507的腐蚀机理。

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	张艳
	李倩
	王胜刚

关键词 ： 2507双相不锈钢, 电化学测试, 晶间腐蚀, 点腐蚀, 钝化膜

Abstract：

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 (R_a) 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.

Key words： 2507 duplex stainless steel electrochemical test intergranular corrosion pitting corrosion passive film

收稿日期: 2014-07-11 出版日期: 2016-01-20

基金资助:国家自然科学基金资助项目(51171199)

通讯作者: 张艳 E-mail: zhangy0909@126.com

作者简介: 张艳(1965-),女,博士,研究方向为材料的腐蚀与防护,联系地址:辽宁省沈阳市沈阳经济技术开发区沈辽西路111号沈阳工业大学理学院(110870)E-mail:zhangy0909@126.com

引用本文:

张艳, 李倩, 王胜刚. 2507双相不锈钢在NaClO溶液中的腐蚀性能[J]. 材料工程, 2016, 44(1): 108-114.
Yan ZHANG, Qian LI, Sheng-gang WANG. Corrosion Resistance of 2507 Duplex Stainless Steel in NaClO Solution. Journal of Materials Engineering, 2016, 44(1): 108-114.

链接本文:

http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2016.01.017 或 http://jme.biam.ac.cn/CN/Y2016/V44/I1/108

Fig.1 2507双相不锈钢的显微金相组织

Fig.2 2507双相不锈钢的EPR曲线

Table 1 2507双相不锈钢的EPR曲线参数

Fig.3 2507双相不锈钢在5g/L NaClO溶液中动电位极化曲线

Table 2 2507双相不锈钢在5g/L NaClO溶液中电化学参数

Fig.4 2507双相不锈钢在5g/L NaClO溶液中Nyquist图

Fig.5 2507双相不锈钢在5g/L NaClO溶液中交流阻抗等效电路

Table 3 2507双相不锈钢在5g/L NaClO溶液中的交流阻抗等效电路拟合数据

Fig.6 2507双相不锈钢在5g/L NaClO溶液中的恒电位极化曲线

Fig.7 2507双相不锈钢在5g/L NaClO溶液中恒电位480s后经Ar⁺溅射后的XPS全谱图

Fig.8 2507双相不锈钢在5g/L NaClO溶液中恒电位480s后经Ar⁺溅射后O1s对应的XPS图谱

Fig.9 2507双相不锈钢在5g/L NaClO溶液中恒电位480s后经Ar⁺溅射后Fe2p_3/2对应的XPS图谱

Fig.10 2507双相不锈钢在5g/L NaClO溶液中恒电位480s后经Ar⁺溅射后Cr2p_3/2对应的XPS图谱

Fig.11 2507双相不锈钢在不同溶液中动电位极化曲线

Fig.12 2507双相不锈钢在不同溶液中Nyquist图

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