NaPO<sub>3</sub>与SDBS缓蚀剂对AZ31镁合金空气电池在NaCl电解液中放电性能的影响

doi:10.11902/1005.4537.2017.180

中国腐蚀与防护学报

2018, Vol. 38

Issue (6): 587-593 DOI: 10.11902/1005.4537.2017.180

本期目录 | 过刊浏览

NaPO₃与SDBS缓蚀剂对AZ31镁合金空气电池在NaCl电解液中放电性能的影响

李亚琼,马景灵(

),王广欣,朱宇杰,宋永发,张景丽

1. 河南科技大学材料与工程学院高纯材料研究中心洛阳 471023

Effect of Sodium Phosphate and Sodium Dodecylbenzene-sulfonate on Discharge Performance of AZ31 Magnesium Air Battery

Yaqiong LI,Jingling MA(

),Guangxin WANG,Yujie ZHU,Yongfa SONG,Jingli ZHANG

1. Research Center for High Purity Materials, Materials Science and Engineering College, Henan University of Science and Technology, Luoyang 471023, China

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摘要:

研究了以铸态AZ31镁合金为阳极材料的镁空气电池在加入了0.5 g/L NaPO₃、0.5 g/L十二烷基苯磺酸钠 (SDBS)、0.5 g/L NaPO₃+0.5 g/L SDBS作为缓蚀剂的3.5% (质量分数) NaCl电解液中的放电性能，测试了AZ31镁合金在不同缓蚀剂溶液中的自腐蚀速率、动电位极化曲线、EIS谱，并使用SEM观察了阳极材料在不同缓蚀剂溶液中的放电形貌。结果表明，加入缓蚀剂可以较好地抑制析氢腐蚀，提高阳极利用率，弱化阳极极化，提高放电电压。其中在NaPO₃+SDBS缓蚀剂溶液中，镁空气电池阳极腐蚀最弱，缓蚀效率可以达到85%，阳极利用率达到43.2%。

关键词 ：镁空气电池, 缓蚀剂, 阳极利用率, 放电电压

Abstract：

Magnesium is a promising anode material for air batteries because of its outstanding characteristics, such as abundance, light mass, and low cost. However, the corrosion susceptibility of Mg-alloy in aqueous solution limits the performance of air battery. In this work, the discharge behavior of air batteries consisted of as-cast AZ31 Mg-alloy as the anode material and 3.5% (mass fraction) NaCl aqueous solution as electrolyte was examined while adding different corrosion inhibitors such as 0.5 g/L sodium phosphate (NaPO₃), 0.5 g/L sodium dodecylbenzenesulfonate (SDBS) and 0.5 g/L NaPO₃+0.5 g/L SDBS respectively. In the meanwhile the free corrosion rate, potentiodynamic polarization curves and electrochemical impedance spectroscopy (EIS) of AZ31 Mg-alloy were measured and the surface morphology of the tested AZ31 Mg-alloy was characterized by means of scanning electron microscope (SEM). The results show that the addition of corrosion inhibitors is effective for inhibiting hydrogen evolution and the corrosion of anode material. Which can also weaken the anodic polarization and enhance the discharge voltage of the battery. Among others, in the air battery with the corrosion inhibitors of 0.5 g/L NaPO₃+0.5 g/L SDBS, the AZ31 Mg-alloy has the minimum corrosion rate of which the inhibition efficiency and anode utilization rate can reach up to 85% and 43.2% respectively.

Key words： magnesium air battery corrosion inhibitor anode utilization rate discharge voltage

收稿日期: 2017-11-02

ZTFLH:

TM911

基金资助:河南科技攻关计划项目(162102210051)

通讯作者: 马景灵 E-mail: majingling@haust.edu.cn

Corresponding author: Jingling MA E-mail: majingling@haust.edu.cn

作者简介: 李亚琼，男，1993出生，硕士生

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引用本文:

李亚琼,马景灵,王广欣,朱宇杰,宋永发,张景丽. NaPO₃与SDBS缓蚀剂对AZ31镁合金空气电池在NaCl电解液中放电性能的影响[J]. 中国腐蚀与防护学报, 2018, 38(6): 587-593.
Yaqiong LI, Jingling MA, Guangxin WANG, Yujie ZHU, Yongfa SONG, Jingli ZHANG. Effect of Sodium Phosphate and Sodium Dodecylbenzene-sulfonate on Discharge Performance of AZ31 Magnesium Air Battery. Journal of Chinese Society for Corrosion and protection, 2018, 38(6): 587-593.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2017.180 或 https://www.jcscp.org/CN/Y2018/V38/I6/587

表1 AZ31镁合金在不同缓蚀剂溶液中的腐蚀速率与缓蚀效率

图1 AZ31镁合金在添加不同缓蚀剂的3.5%NaCl溶液中的腐蚀形貌

图2 AZ31镁合金在不同缓蚀剂溶液中的Tafel曲线

表2 AZ31镁合金在不同缓蚀剂溶液中的Tafel曲线拟合数据

图3 AZ31镁合金在含不同缓蚀剂溶液中的Nyquist图

图4 AZ31镁合金在含不同缓蚀剂溶液中的等效电路图

表3 AZ31镁合金在不同缓蚀剂溶液中等效电路图的拟合数据

图5 不同电解液镁空气电池在20 mA·cm-2条件下的放电曲线

表4 不同电解液镁空气电池在20 mA·cm-2条件下的放电参数

图6 不同电解液镁空气电池以20 mA·cm-2的电流密度放电300 min的放电形貌

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