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中国腐蚀与防护学报  2026, Vol. 46 Issue (2): 533-540     CSTR: 32134.14.1005.4537.2025.105      DOI: 10.11902/1005.4537.2025.105
  研究报告 本期目录 | 过刊浏览 |
Ti3AlC2 在含F- 的高温硫酸溶液中的腐蚀行为研究
迟永晨, 王浩杰, 侯强强, 郑莉莉, 李希超()
青岛大学机电工程学院 青岛 266071
Corrosion Behavior of Ti3AlC2 in High-temperature Sulfuric Acid Solution Containing F-
CHI Yongchen, WANG Haojie, HOU Qiangqiang, ZHENG Lili, LI Xichao()
College of Mechanical and Electronic Engineering, Qingdao University, Qingdao 266071, China
引用本文:

迟永晨, 王浩杰, 侯强强, 郑莉莉, 李希超. Ti3AlC2 在含F- 的高温硫酸溶液中的腐蚀行为研究[J]. 中国腐蚀与防护学报, 2026, 46(2): 533-540.
Yongchen CHI, Haojie WANG, Qiangqiang HOU, Lili ZHENG, Xichao LI. Corrosion Behavior of Ti3AlC2 in High-temperature Sulfuric Acid Solution Containing F-[J]. Journal of Chinese Society for Corrosion and protection, 2026, 46(2): 533-540.

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摘要: 

采用动电位极化、恒电位极化和电化学阻抗谱等方法研究Ti3AlC2材料在含有F-的高温H2SO4溶液中的腐蚀行为。利用扫描电子显微镜(SEM)、X射线光电子能谱(XPS)等对腐蚀产物的形貌、微观组织进行分析。结果表明,在模拟质子交换膜燃料电池(PEMFC)环境下(80 ℃,0.5 mol·L-1 H2SO4和2 mg·L-1 F-),Ti3AlC2的自腐蚀电位为-128.7 mV,在0~370 mV电压范围内发生钝化,钝化电流密度为75~200 μA·cm-2,随着电位升高,腐蚀电流密度显著上升并发生了氧化反应;0.6 V恒电位极化后,腐蚀电流密度稳定在1121.66 μA·cm-2,腐蚀后样品表面表现为明显的晶界腐蚀以及少量的晶粒腐蚀,腐蚀产物主要为TiO2和Al2O3。Ti3AlC2的耐蚀性随着酸性下降有大幅的提升,而溶液温度的升高和F-浓度增加会使Ti3AlC2耐蚀性变差。

关键词 Ti3AlC2质子交换膜燃料电池双极板电化学腐蚀腐蚀机理    
Abstract

In this work, the corrosion behavior of Ti3AlC2 in high-temperature sulfuric acid solutions containing F- was investigated by means of potentiodynamic polarization, potentiostatic polarization, and electrochemical impedance spectroscopy (EIS). Meanwhile, the corrosion products were characterized by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The results show that in a simulated proton exchange membrane fuel cell working environment (80 ℃, 0.5 mol·L-1 H2SO4 and 2 mg·L-1 F-), the Ti3AlC2 presented free corrosion potential of -128.7 mV. Passivation occurred within the potential range of 0-370 mV, with a passivation current density of 75-200 μA·cm-2. As the potential increased, the corrosion current density rose significantly, accompanied by oxidation reactions. After potentiostatic polarization at 0.6 V, the corrosion current density stabilized at 1121.66 μA·cm-2. The corrosion morphology was mainly manifested as obvious grain boundary corrosion and a small amount of grain corrosion, and the corrosion products compose mainly of TiO2 and Al2O3. The corrosion resistance of Ti3AlC2 is improved considerably with the decreasing acidity, whereas elevated solution temperature and increased F- concentration its corrosion resistance is deteriorated.

Key wordsTi3AlC2    PEMFC bipolar plate    electrochemical corrosion    corrosion mechanism
收稿日期: 2025-03-31      32134.14.1005.4537.2025.105
ZTFLH:  TK91  
基金资助:国家自然科学青年科学基金(52001179);山东省自然科学基金(ZR2020ME019)
通讯作者: 李希超,E-mail:lixichao@qdu.edu.cn,研究方向为燃料电池双极板表面改性
作者简介: 迟永晨,男,1999年生,硕士生
Sample numbersTemperature/ ℃pH valueF- content/ mg·L-1
S70027002
S80028002
S90029002
S80128012
S80328032
S80058005
S8001080010
表1  腐蚀实验条件及对应的样品编号
图1  Ti3AlC2在不同溶液环境中的动电位极化曲线
SamplePotentiodynamic polarizationPotentiostatic polarization
numbersEcorr / mVEp / mVIp / μA·cm-2Iw / μA·cm-2Icorr / μA·cm-2
S7002-123.310~50050~150366.2702.2
S8002-128.70~37075~2001502.31121.6
S9002-164.2-20~350125~2853371.91410.3
S8012-124.4-30~37040~110502.983.9
S8032-93.040~50030~130198.439.5
S8005-165.4-10~330245~45014558.31359.3
S80010-180.4-40~550325~8001119.41695.5
表2  Ti3AlC2在不同腐蚀环境中极化曲线拟合参数
图2  Ti3AlC2在不同溶液环境中的恒电位极化曲线
图3  Ti3AlC2在不同溶液环境中0.6 V恒电位极化5 h后的表面腐蚀形貌
图4  Ti3AlC2恒电位极化前后的Nyquist图和等效电路图
Sample numbersRs / Ω·cm2Rct / Ω·cm2CPEdl / mF·cm2
S70025.65/3.45996/15413.62/4.02
S80022.88/2.38861/13663.28/3.44
S90022.24/2.18397/4393.69/3.88
S801223.75/20.222193/40190.82/0.49
S8032247.8/501.53631/53880.03/0.31
S80053.41/2.33370/5092.87/3.05
S800102.34/2.10184/4813.47/4.76
表3  Ti3AlC2在不同腐蚀环境中的EIS谱拟合结果
图5  Ti3AlC2在80 ℃,pH = 0和2 mg·L-1 F-溶液中恒电位极化后表面XPS分析
图6  Ti3AlC2在PEMFC环境下腐蚀机理
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