时效温度对S32750超级双相不锈钢组织和抗氢氟酸腐蚀性能的影响

doi:10.11902/1005.4537.2016.205

中国腐蚀与防护学报

2017, Vol. 37

Issue (6): 519-525 DOI: 10.11902/1005.4537.2016.205

研究报告

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时效温度对S32750超级双相不锈钢组织和抗氢氟酸腐蚀性能的影响

逄旭光¹, 刘润青¹, 王文涛², 史艳华¹, 李飞¹, 梁平¹(

)

1辽宁石油化工大学机械工程学院抚顺 113001
2 抚顺机械设备制造有限公司抚顺 113005

Effect of Aging Temperature on Microstructure and Corrosion Resistance of S32750 Super Duplex Stainless Steel in Hydrofluoric Acid

Xuguang PANG¹, Runqing LIU¹, Wentao WANG², Yanhua SHI¹, Fei LI¹, Ping LIANG¹(

)

1 School of Mechanical Engineering, Liaoning Shihua University, Fushun 113001, China
2 Fushun Mechanical Equipment Manufacturing Co., Ltd., Fushun 113005, China

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摘要:

通过金相显微镜和扫描电镜观察了S32750超级双相不锈钢 (SDSS) 经650~1000 ℃时效处理后的显微组织和微观形貌;通过XRD分析了时效后各试样的物相结构;借助动电位极化、电化学阻抗和Mott-Schokkty曲线等方法,考察了时效后的S32750 SDSS在5% (体积分数) HF溶液中的腐蚀行为。结果表明：当时效温度为650和1000 ℃时,S32750 SDSS内并没有析出物产生。当温度上升到750~950 ℃时,开始产生σ析出相;且温度为850 ℃时,σ析出相最多,抗氢氟酸腐蚀性能最差。这主要是因为析出的σ相造成了材料内Cr和Mo分布的不均匀,促进了腐蚀微电池的形成,加快了不锈钢的溶解。同时,σ相的析出也增大了钝化膜的载流子密度,促进了F^-的吸附,增大了钝化膜的溶解速率,降低了钝化膜的稳定性,加快了双相不锈钢的腐蚀。

关键词 ： S32750超级双相不锈钢, 氢氟酸, σ相, 时效温度

Abstract：

S32750 super duplex stainless steel (SDSS) was aged in the temperature range 650 ℃ to 1000 ℃, and then was characterized by means of optical microscope (OM), scanning electronic microscope (SEM) and X-ray diffractometer (XRD). The corrosion resistance of the aged steel in 5%(volume fraction) HF solution was assessed by measurements of potentiodynamic polarization, electrochemical impedance spectra (EIS) and Mott-Schokkty plots. Results show that the σ phase precipitated in the steel in the temperature range from 750 ℃ to 950 ℃, but not at 650 ℃ and 1000 ℃ respectively. Among others, the amount of σ phase is the highest and correspondingly, the corrosion resistance is also the worst for the steel aged at 850 ℃. This is mainly because of that the precipitates of σ phase lead to the segregation of Cr and Mo within the steel, thus the non-uniform distribution of the alloying elements in the steel may induce galvanic corrosion within the steel , which accelerates the dissolution of SDSS. At the same time, the σ phase precipitation may also induce the increase of carrier densities of the formed passive film of the steel in HF solution, which enhanced the adsorption of F^-, and in turn the dissolution rate of passive film and finally reduced the stability of the passive film, thus, the corrosion rate of SDSS in HF is accelerated.

Key words： S32750 super duplex stainless steel hydrofluoric acid σ phase aging temperature

收稿日期: 2016-10-21

ZTFLH:

TG174.2

基金资助:国家自然科学基金 (51175240) 和辽宁省教育厅2012年科学研究一般项目 (L2012127)

作者简介:

作者简介逄旭光,男,1991年生,硕士生

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引用本文:

逄旭光, 刘润青, 王文涛, 史艳华, 李飞, 梁平. 时效温度对S32750超级双相不锈钢组织和抗氢氟酸腐蚀性能的影响[J]. 中国腐蚀与防护学报, 2017, 37(6): 519-525.
Xuguang PANG, Runqing LIU, Wentao WANG, Yanhua SHI, Fei LI, Ping LIANG. Effect of Aging Temperature on Microstructure and Corrosion Resistance of S32750 Super Duplex Stainless Steel in Hydrofluoric Acid. Journal of Chinese Society for Corrosion and protection, 2017, 37(6): 519-525.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2016.205 或 https://www.jcscp.org/CN/Y2017/V37/I6/519

图1 不同温度时效后的S32750超级双相不锈钢的显微组织形貌

图2 不同温度时效处理后的S32750超级双相不锈钢的XRD谱

图3 经950 ℃下20 min时效处理的S32750超级双相不锈钢的SEM像和EDS结果

图4 不同温度时效后的S32750超级双相不锈钢在5%HF溶液中的电化学阻抗谱

图5 电化学阻抗谱拟合所用等效电路图

图6 时效温度对S32750超级双相不锈钢Rt和Rf的影响

表1 图3中各个位置的化学成分

图7 不同时效温度下S32750超级双相不锈钢在5%HF溶液中的极化曲线

图8 S32750超级双相不锈钢在5%HF溶液中自腐蚀电位和自腐蚀电流密度随时效温度的变化曲线

图9 不同温度时效处理后的S32750超级双相不锈钢在5%HF溶液中的Mott-Schokkty曲线

表2 不同温度时效处理后的S32750超级双相不锈钢钝化膜内施主密度和受主密度的拟合结果

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