铜基非晶合金复合材料在NaCl溶液中的腐蚀行为研究

doi:10.11902/1005.4537.2017.184

中国腐蚀与防护学报

2018, Vol. 38

Issue (5): 478-486 DOI: 10.11902/1005.4537.2017.184

研究报告

本期目录 | 过刊浏览

铜基非晶合金复合材料在NaCl溶液中的腐蚀行为研究

张志英(

), 汤迦南, 余杰, 王旭东, 黄罗超, 邹俊文, 唐浩, 张继康, 陈亚涛, 程东鹏

武汉理工大学材料科学与工程学院武汉 430070

Corrosion Behavior of Cu-based Metallic Glass Composites in NaCl Solution

Zhiying ZHANG(

), Jianan TANG, Jie YU, Xudong WANG, Luochao HUANG, Junwen ZHOU, Hao TANG, Jikang ZHANG, Yatao CHEN, Dongpeng CHENG

School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China

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摘要:

通过差示扫描量热法,设定升温速率为10 K/min,确定了铜基块体非晶合金Cu_47.5Zr_47.5-_xAl₅Hf_x(x=0,9.5) 的玻璃转变温度T_g为712~722 K,晶化温度T_x为747~766 K。结果表明,通过退火处理可获得铜基非晶合金或非晶-纳米晶复合材料。退火温度和退火时间影响组织结构和显微硬度。当退火温度高于T_g时,随着退火温度的升高以及退火时间的延长,显微硬度和结晶度逐渐增加然后趋于平缓。通过浸泡法和动电位极化法研究了铸态试样以及不同条件下退火后试样在3.5% (质量分数) NaCl溶液中的腐蚀行为。结果表明,Cu_47.5Zr_47.5-_xAl₅Hf_x(x=0,9.5) 试样在3.5%NaCl溶液中发生点蚀。与铸态试样相比,在623 K (即低于T_g) 或773 K (即略高于T_x) 退火30 min试样的自腐蚀电位升高,腐蚀电流密度略微增加,耐蚀性变化不大。在923 K (即远高于T_x) 退火30 min 后试样的自腐蚀电位显著降低,腐蚀电流密度变化不大,耐腐蚀性变差。Hf含量对耐腐蚀性的影响较小。

关键词 ：非晶合金复合材料, 退火, 腐蚀, 动电位极化, X射线衍射, 显微硬度

Abstract：

Using differential scanning calorimetry (DSC) with heating rate of 10 K/min, the glass transition temperature T_g and the crystallization temperature T_x of the Cu-based bulk metallic glasses (BMGs) Cu_47.5Zr_47.5-_xAl₅Hf_x (x=0, 9.5) were determined to be 712~722 K and 747~766 K, respectively. X-ray diffraction (XRD) analysis confirmed that Cu-based metallic glass or metallic glass-nanocrystalline composites could be obtained throu-gh annealing. The microstructure and microhardness were affected by the annealing temperature and time. When the annealing temperature was above T_g, with the increase of annealing temperature and time, the crystallinity and the microhardness gradually increased and then leveled off. Immersion tests and potentiodynamic polarization tests were carried out to investigate the corrosion behavior of the as-cast and annealed samples in 3.5%NaCl solution. Pitting was observed on the Cu_47.5Zr_47.5-_xAl₅Hf_x (x=0, 9.5) samples after immersion in 3.5%NaCl solution. Compared with the as-cast samples, the samples anneal-ed at 623 K (i.e. below T_g) or at 773 K (i.e. slightly above T_x) exhibited higher corrosion potential and slightly larger corrosion current density, indicating the similar corrosion resistance of them. The samples annealed at 923 K (i.e. much higher than T_x) for 30 min exhibited much lower corrosion potential and similar corrosion current density, indicating their poorer corrosion resistance. Hf content showed minor effect on the corrosion resistance.

Key words： bulk metallic glass composite anneal corrosion potentiodynamic polarization XRD microhardness

收稿日期: 2017-11-09

ZTFLH:

TG146.4

基金资助:国家自然科学基金 (51502229),武汉理工大学博士科研启动基金(471-40120189) 和武汉理工大学自主创新研究基金 (2017-CL-B1-08)

作者简介:

作者简介张志英,女,1977年生,博士,教授

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引用本文:

张志英, 汤迦南, 余杰, 王旭东, 黄罗超, 邹俊文, 唐浩, 张继康, 陈亚涛, 程东鹏. 铜基非晶合金复合材料在NaCl溶液中的腐蚀行为研究[J]. 中国腐蚀与防护学报, 2018, 38(5): 478-486.
Zhiying ZHANG, Jianan TANG, Jie YU, Xudong WANG, Luochao HUANG, Junwen ZHOU, Hao TANG, Jikang ZHANG, Yatao CHEN, Dongpeng CHENG. Corrosion Behavior of Cu-based Metallic Glass Composites in NaCl Solution. Journal of Chinese Society for Corrosion and protection, 2018, 38(5): 478-486.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2017.184 或 https://www.jcscp.org/CN/Y2018/V38/I5/478

图1 Cu47.5Zr47.5-xAl5Hfx(x=0,9.5) 试样的DSC曲线 (升温速率为10 K/min)

表1 通过DSC确定的Cu47.5Zr47.5-xAl5Hfx(x=0,9.5) 的Tg和Tx (升温速率为10 K/min)

图2 Cu47.5Zr47.5-xAl5Hfx(x=9.5) 未退火试样以及在923 K退火8~30 min试样的XRD谱

图3 Cu47.5Zr47.5-xAl5Hfx(x=0) 未退火试样以及在不同温度 (623~923 K) 下退火30 min试样的XRD谱

图4 Cu47.5Zr47.5-xAl5Hfx(x=9.5) 未退火试样以及在不同温度 (623~923 K) 下退火30 min试样的XRD谱

图5 Cu47.5Zr47.5-xAl5Hfx(x=9.5) 试样在923 K退火不同时间后的显微硬度

图6 Cu47.5Zr47.5-xAl5Hfx(x=0, 9.5) 试样在不同温度退火30 min后的显微硬度

图7 铸态Cu47.5Zr47.5-xAl5Hfx(x=0, 9.5) 试样浸泡前的光学显微像

图8 铸态Cu47.5Zr47.5-xAl5Hfx(x=0) 试样浸入3.5%NaCl溶液72 h后光学显微像

图9 铸态Cu47.5Zr47.5-xAl5Hfx(x=9.5) 试样浸入3.5%NaCl溶液72 h后的光学显微像

图10 铸态Cu47.5Zr47.5-xAl5Hfx(x=0) 试样浸入3.5%NaCl溶液120 h后的SEM像

图11 铸态Cu47.5Zr47.5-xAl5Hfx(x=9.5) 试样浸入3.5%NaCl溶液120 h后的SEM像

图12 Cu47.5Zr47.5-xAl5Hfx(x=0) 铸态试样和923 K退火处理后试样在3.5%NaCl溶液中的动电位极化曲线

图13 Cu47.5Zr47.5-xAl5Hfx(x=9.5) 铸态试样和623~923 K退火处理后试样在3.5%NaCl溶液中的动电位极化曲线

图14 Cu47.5Zr47.5-xAl5Hfx(x=0, 9.5) 铸态试样和923 K退火处理后试样在3.5%NaCl溶液中的动电位极化曲线

表2 Cu47.5Zr47.5-xAl5Hfx(x=0) 试样浸入3.5%NaCl溶液120 h后的EDS结果

表3 Cu47.5Zr47.5-xAl5Hfx(x=9.5) 试样浸入3.5%NaCl溶液120 h后的EDS结果

表4 Cu47.5Zr47.5-xAl5Hfx(x=0, 9.5) 铸态试样以及经不同温度退火处理后试样在3.5%NaCl溶液中动电位极化测得的自腐蚀电位Ecorr和腐蚀电流密度Icorr

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