复合电解液中AZ31B镁合金的放电特性及电压滞后

doi:10.11902/1005.4537.2017.044

中国腐蚀与防护学报

2018, Vol. 38

Issue (2): 197-202 DOI: 10.11902/1005.4537.2017.044

研究报告

本期目录 | 过刊浏览

复合电解液中AZ31B镁合金的放电特性及电压滞后

陈琳^1,²(

), 钟福荣¹, 昝金龙¹

1 四川理工学院材料科学与工程学院自贡 643000
2 四川理工学院材料腐蚀与防护四川省重点实验室自贡 643000

Discharge Property and Voltage Delay of AZ31B Mg Alloy in Mg(NO₃)₂/Mg(ClO₄)₂ Composite Electrolyte

Lin CHEN^1,²(

), Furong ZHONG¹, Jinlong ZAN¹

1.College of Materials Science and Engineering, Sichuan University of Science & Engineering, Zigong 643000, China;
2.Material Corrosion and Protection Key Laboratory of Sichuan Province, Sichuan University of Science & Engineering, Zigong 643000, China;

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摘要:

通过计时电位法和电化学阻抗谱技术研究Mg(NO₃)₂+Mg(ClO₄)₂复合电解液中AZ31B镁合金电极的放电性能和电压滞后,并初步探讨了镁合金电极表面腐蚀膜的结构变化。结果表明：AZ31B合金在Mg(NO₃)₂：Mg(ClO₄)₂溶液体积比为72∶28和74∶26时恒流放电曲线平稳,在2.5和6 mA·cm^-2放电时稳定电位均可达到约-1.24 V,电压滞后时间为5~8 s;放电后表面膜的化学基团与放电前相同,放电破坏了镁合金电极表面腐蚀膜,造成连续串珠状点蚀坑,其膜电阻消失,电荷转移电阻减小至375 Ω·cm²。

关键词 ： AZ31B镁合金, 复合电解液, 放电, 腐蚀膜, 电压滞后

Abstract：

In neutral and acidic solution, Mg reacts with water and release hydrogen, which reduces the utilization rate of electrode and brings difficulties to the assembly of the battery. In the alkaline solution, the Mg-surface would form a dense protective film, which make the electrode passivation and prevents discharging. In order to develop proper Mg-alloy suitable for battery electrolytes, the discharge properties and voltage delay of AZ31B Mg-alloy in compound electrolytes with different volume ratio of Mg(NO₃)₂ to Mg(ClO₄)₂ were studied by means of chronopotentiometry and electrochemical impedance spectroscopy and the corrosion products-films formed on the surface of AZ31B Mg-alloy were examined by means of SEM and infra-red spectrometer. Results show that in solutions with volume ratios of Mg(NO₃)₂ to Mg(ClO₄)₂ are 72:28 and 74:26 respectively, the discharge curves of AZ31B Mg-alloy are smooth and steady with stable potentials about -1.24 V (2.5 and 6 mA·cm^-2) and the delay time 5~8 s. Chemical groups of the corrosion products-film after discharge is the same as before. However, the surface film of corrosion products has been destroyed by discharge process, resulting in continuous beads-like corrosion pits, therewith the film resistance would disappear and the charge transfer resistance decreases to 375 Ω·cm².

Key words： AZ31B Mg alloy composite electrolyte discharge corrosion film voltage delay

收稿日期: 2017-03-25

基金资助:四川理工学院人才引进项目 (2015CR58)

作者简介:

作者简介陈琳,女,1975年生,博士

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引用本文:

陈琳, 钟福荣, 昝金龙. 复合电解液中AZ31B镁合金的放电特性及电压滞后[J]. 中国腐蚀与防护学报, 2018, 38(2): 197-202.
Lin CHEN, Furong ZHONG, Jinlong ZAN. Discharge Property and Voltage Delay of AZ31B Mg Alloy in Mg(NO₃)₂/Mg(ClO₄)₂ Composite Electrolyte. Journal of Chinese Society for Corrosion and protection, 2018, 38(2): 197-202.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2017.044 或 https://www.jcscp.org/CN/Y2018/V38/I2/197

图1 AZ31B镁合金在Mg(NO3)2+Mg(ClO4)2电解液中的放电曲线 (2.5 mAcm-2)

表1 AZ31B镁合金的稳定电位和滞后时间

图2 AZ31B镁合金在不同配比的Mg(NO3)2+Mg(ClO4)2电解液中的放电曲线

图3 AZ31B镁合金在复合电解液中放电的Es和td值

图4 镁合金放电前后的SEM像

图5 镁合金放电前后表面膜的红外光谱

图6 AZ31B镁合金在复合电解液中的EIS谱

图7 AZ31B镁合金阻抗谱等效电路

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