中温时效处理对SAF2304双相不锈钢耐蚀性的影响

doi:10.11902/1005.4537.2019.216

中国腐蚀与防护学报

2020, Vol. 40

Issue (1): 51-56 DOI: 10.11902/1005.4537.2019.216

研究报告

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中温时效处理对SAF2304双相不锈钢耐蚀性的影响

武栋才,韩培德(

)

太原理工大学材料科学与工程学院新材料界面科学与工程教育部重点实验室太原 030024

Effects of Moderate Temperature Aging Treatment on Corrosion Resistance of SAF2304 DuplexStainless Steel

WU Dongcai,HAN Peide(

)

Key Laboratory of Interface Science and Engineering in Advanced Materials, College of Materials Science and Engineering，Taiyuan University of Technology, Taiyan 030024, China

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摘要:

采用金相显微镜 (OM)、动电位极化曲线和电化学阻抗谱对不同温度 (600~800 ℃) 时效处理2 h和不同时间 (0.25~5 h) 700 ℃时效处理SAF2304双相不锈钢的显微组织和耐蚀性进行研究。结果表明：1050 ℃固溶1 h试样，经600，650，700，750和800 ℃时效处理2 h后，随着温度的升高，试样中析出相先增加。700 ℃试样中铁素体α相和奥氏体γ相相界处析出相最多，对应的耐蚀能力最差，表明700 ℃是SAF2304析出相析出敏感温度，之后温度继续升高至800 ℃，析出相明显减少，耐蚀性能增强。700 ℃时效处理0.25，0.5，1，2，3，4和5 h的试样，随着时效时间的增加析出相越来越多，钝化膜越来越不均匀不致密，耐蚀性能越来越差。

关键词 ： 2304双相不锈钢, 析出相, 时效处理, 耐蚀性, 敏感温度

Abstract：

The microstructure and corrosion resistance of SAF2304 duplex stainless steel after aging treatment for 2 h at 600, 650, 700, 750 and 800 ℃, as well as at 700 ℃ for 0.25, 0.5,1, 2, 3, 4 and 5 h respectively were characterized by means of optical microscopy (OM), electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization measurement. The results showed that with the increasing aging temperature, the amount of secondary phase precipitated at grain-boundaries of ferrite/austenite increased and the maximum value of which emerged at 700 ℃ sharply, correspondingly the steel after solution treated at 1050 ℃ for 1 h and aged at 700 ℃ for 2 h showed the worst corrosion resistance. Therefore, the SAF2304 duplex stainless steel is sensitive to the aging treatment at 700 ℃ in terms of the secondary phase precipitation and corrosion resistance. For the steel aged at 800 ℃, the precipitated phase was rarely observed, and its corrosion resistance was enhanced. Furthermore, with the increasing time for the aging at 700 ℃, precipitates of secondary phase increased sharply, while the formed passivation film became poor and poor in compactness and uniformity, so as the corrosion resistance of the steel.

Key words： duplex stainless steel 2304 precipitated phase aging treatment corrosion resistance sensitive temperature

收稿日期: 2019-07-05

ZTFLH:

TG174

基金资助:国家自然科学基金(51371123);高等学校博士学科重点博导基金(2013140211003);山西省自然科学基金(2014011002)

通讯作者: 韩培德 E-mail: hanpeide@126.com

Corresponding author: Peide HAN E-mail: hanpeide@126.com

作者简介: 武栋才，男，1985年生，硕士生

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引用本文:

武栋才,韩培德. 中温时效处理对SAF2304双相不锈钢耐蚀性的影响[J]. 中国腐蚀与防护学报, 2020, 40(1): 51-56.
Dongcai WU, Peide HAN. Effects of Moderate Temperature Aging Treatment on Corrosion Resistance of SAF2304 DuplexStainless Steel. Journal of Chinese Society for Corrosion and protection, 2020, 40(1): 51-56.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2019.216 或 https://www.jcscp.org/CN/Y2020/V40/I1/51

图1 1050 ℃固溶处理1 h及不同温度时效处理2 h后样品的OM相

图2 SAF2304钢在3.5%NaCl溶液中不同时效温度后试样的极化曲线

图3 700 ℃时效处理不同时间后样品的OM像

图4 SAF2304钢在3.5%NaCl溶液中700 ℃时效不同时间后试样的极化曲线

图5 SAF2304钢在700 ℃时效不同时间后的阻抗谱图

图6 SAF2304钢在700 ℃时效不同时间后的阻抗谱等效电路

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