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中国腐蚀与防护学报  2022, Vol. 42 Issue (1): 79-84    DOI: 10.11902/1005.4537.2020.245
  研究报告 本期目录 | 过刊浏览 |
结构稳定性对Zr基非晶合金电化学腐蚀性能的影响
阎竹, 张晨阳, 王立新, 袁国(), 张元祥, 方烽, 王洋, 康健
东北大学材料科学与工程学院 沈阳 110819
Effect of Structural Stability on Electrochemical Corrosion Properties of Zr-based Amorphous Alloy
YAN Zhu, ZHANG Chenyang, WANG Lixin, YUAN Guo(), ZHANG Yuanxiang, FANG Feng, WANG Yang, KANG Jian
School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
全文: PDF(7332 KB)   HTML
摘要: 

使用双辊法制备了高能态、高自由体积含量的Zr55Cu30Al10Ni5非晶合金，研究了结构稳定性对非晶合金在3.5% (质量分数) NaCl溶液中电化学性能的影响。结果表明，退火试样较铸态试样自由体积减小，动电位极化实验中均出现点蚀。在653 K (低于Tg) 真空退火30 min的试样电化学腐蚀后表面点蚀坑尺寸和数量减少。在693和723 K (介于Tg和Tx之间) 退火的试样腐蚀后点蚀坑尺寸变小，数量增加，非晶中形成的纳米晶使点蚀敏感性增加，基体中自由体积减小阻碍点蚀坑进一步传播。研究表明，双辊法制备的高能态的、自由体积含量多的非晶合金铸带易被腐蚀，在结晶温度以下退火，可以减少其自由体积含量，有利于其腐蚀性能的提高。
关键词 ： Zr基非晶,  退火,  结构弛豫,  纳米晶,  电化学性能    
Abstract：

Zr55Cu30Al10Ni5 amorphous alloy with high energy state and high free volume content was prepared by twin-roll rolling method. Then the effect of structural stability on the electrochemical properties of the prepared amorphous alloy in 3.5% (mass fraction) NaCl solution was studied. The results show that the free volume of the annealed alloy is smaller than that of the as-cast one, while the former one suffered from pitting corrosion during the potentiodynamic polarization test. The size and number of the electrochemical corrosion test induced corrosion pits are reduced on the surface of the alloy annealed in vacuum at 653 K (lower than Tg) for 30 min. The size of corrosion pits become smaller and the number of pits increases for the alloy annealed at 693 and 723 K (between Tg and Tx) respectively. The nano-crystallites formed in the amorphous alloy may increase its pitting sensitivity, the decrease of free volume in the matrix may hinder the further propagation of corrosion pits. This study shows that the amorphous alloy strip with high energy and high free volume content prepared by Twin-roll rolling method is prone to suffer from corrosion, whereas, the annealing below the crystallization temperature can reduce its free volume content and thus improve its corrosion performance.
Key words： Zr-based amorphous    anneal    structural relaxation    nanocrystal    electrochemical property
收稿日期: 2020-11-30     
ZTFLH:  TG174  
基金资助:基本科研业务费重大科技创新项目(N170708019)
通讯作者: 袁国     E-mail: yuanguoral@sina.com
Corresponding author: YUAN Guo     E-mail: yuanguoral@sina.com
作者简介: 阎竹，女，1994年出生，硕士生
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阎竹
张晨阳
王立新
袁国
张元祥
方烽
王洋
康健

引用本文:

阎竹, 张晨阳, 王立新, 袁国, 张元祥, 方烽, 王洋, 康健. 结构稳定性对Zr基非晶合金电化学腐蚀性能的影响[J]. 中国腐蚀与防护学报, 2022, 42(1): 79-84.
Zhu YAN, Chenyang ZHANG, Lixin WANG, Guo YUAN, Yuanxiang ZHANG, Feng FANG, Yang WANG, Jian KANG. Effect of Structural Stability on Electrochemical Corrosion Properties of Zr-based Amorphous Alloy. Journal of Chinese Society for Corrosion and protection, 2022, 42(1): 79-84.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2020.245      或      https://www.jcscp.org/CN/Y2022/V42/I1/79

图1  Zr55Cu30Al10Ni5铸态及退火态试样的XRD图谱
图2  Zr55Cu30Al10Ni5铸态及退火态试样的DSC曲线 (升温速率为20 K/min)
图3  Zr55Cu30Al10Ni5铸态及退火态试样在Tg点前的弛豫焓值
图4  Zr55Cu30Al10Ni5铸态及退火态试样在3.5%NaCl溶液中的动电位极化曲线
AlloyEcorr / mVIcorr / A·cm-2Epit / mVEpit-Ecorr / mV
As-cast-353 (±11)7.438×10-7 (±0.36)-143 (±17)210
Annealed / 653 K-332 (±2)5.743×10-7 (±0.21)-157 (±29)175
Annealed / 693 K-301 (±7)2.191×10-7 (±0.17)-212 (±34)89
Annealed / 723 K-287 (±16)9.823×10-8 (±0.42)-253 (±21)34
表1  Zr55Cu30Al10Ni5铸态及退火态非晶合金在3.5%NaCl溶液中极化曲线拟合结果
图5  Zr55Cu30Al10Ni5铸态及退火态非晶合金在3.5%NaCl溶液中的电化学阻抗图谱
图6  Zr55Cu30Al10Ni5非晶合金在3.5%NaCl溶液中的等效电路图
AlloyRs / Ω·cm2Y0 / 10-5 (Ω-1·cm-2·s-n)nRct / Ω·cm2
As-cast24.27 (±0.48)1.039 (±0.025)0.92385 (±0.0045)1.112 (±0.029) ×105
Annealed / 653 K17.31 (±0.39)0.437 (±0.010)0.91442 (±0.0037)1.930 (±0.043) ×105
Annealed / 693 K26.74 (±0.48)0.587 (±0.011)0.94333 (±0.0034)4.545 (±0.126) ×105
Annealed / 723 K27.07 (±0.47)0.322 (±0.049)0.90861 (±0.0026)8.002 (±0.187) ×105
表2  Zr55Cu30Al10Ni5铸态及退火态非晶合金在3.5%NaCl溶液中EIS拟合结果
图7  Zr55Cu30Al10Ni5铸态及退火态试样经过3.5%NaCl溶液极化后的表面形貌
图8  Zr55Cu30Al10Ni5铸态及退火态试样TEM图
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