聚丙烯酸钠/ZnO复合缓蚀剂对6061铝合金在碱性电解液中电化学活性和放电性能的影响

刘慧君, 武美萍, 段为朋, 马毅青, 李逞龙, 缪小进

doi:10.16577/j.issn.1001-1560.2023.0089

材料保护 >

2023 , Vol. 56 >Issue 4: 96 - 103

DOI: https://doi.org/10.16577/j.issn.1001-1560.2023.0089

试验研究

聚丙烯酸钠/ZnO复合缓蚀剂对6061铝合金在碱性电解液中电化学活性和放电性能的影响

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¹江南大学机械工程学院； ²江南大学江苏省食品先进制造装备技术重点实验室

武美萍(1970-)，教授，博士，研究方向为数字化设计与制造、复杂装备智能制造，电话136651655964，E-mail:wumeiping163＠163.com

收稿日期: 2022-10-21

修回日期: 2022-11-14

录用日期: 2022-12-15

网络出版日期: 2023-08-03

基金资助

基于3D打印技术的超微型柔性可充电式铝空气电池制备研究(2016300TS00910901)资助

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Influences of Sodium Polyacrylate/ZnO Composite Corrosion Inhibitor on the Electrochemical Activity and Discharge Performance of 6061 Aluminum Alloy in Alkaline Electrolyte

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(a.School of Mechanical Engineering，b.Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment ＆Technology，Jiangnan University，Wuxi 214122，China)

Received date: 2022-10-21

Revised date: 2022-11-14

Accepted date: 2022-12-15

Online published: 2023-08-03

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摘要

为了抑制铝-空气电池阳极的自腐蚀速率、提高其放电性能，选用6061 铝合金作为阳极材料，研究了单独添加和复合添加聚丙烯酸钠(PAAS)和氧化锌(ZnO)对铝合金在4 mol/L NaOH 溶液中自腐蚀及放电性能的影响。结果表明:PAAS/ZnO 复合缓蚀剂的缓蚀效果强于单一缓蚀剂。复合缓蚀剂在促进阳极活化的同时，在铝阳极表面形成了更加稳定的复合保护膜，有效减缓了阳极的析氢自腐蚀，提高了阳极利用率。在NaOH + PAAS +ZnO 电解液体系中，6061 铝合金的溶解主要由电荷在腐蚀产物或锌盐沉积层中的扩散控制。加入复合缓蚀剂后，6061 铝合金的自腐蚀速率由0.496 4 mg/(cm2·min)降至0.275 0 mg/(cm2·min)，缓蚀效率达到44.6%，同时平均放电电压由-1.381 V 负移至-1.681 V，阳极利用率提高了13.5%，铝-空气电池的放电性能得到明显改善。

关键词： 铝-空气电池; 6061 铝阳极; PAAS/ZnO; 复合缓蚀剂; 电化学活性

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刘慧君, 武美萍, 段为朋, 马毅青, 李逞龙, 缪小进 . 聚丙烯酸钠/ZnO复合缓蚀剂对6061铝合金在碱性电解液中电化学活性和放电性能的影响[J]. 材料保护, 2023 , 56(4) : 96 -103 . DOI: 10.16577/j.issn.1001-1560.2023.0089

Abstract

For suppressing the self-corrosion rate of the anode of aluminum-air battery and improving its discharge performance，the effects of adding sodium polyacrylate (PAAS) or zinc oxide (ZnO) alone or adding them both on the self-corrosion and discharge properties of aluminum alloy in 4mol/L NaOH solution were studied using 6061 aluminum alloy as anode material.Results showed that the effect of PAAS/ZnO composite corrosion inhibitor was better than that of single corrosion inhibitor.The composite corrosion inhibitor not only promoted the activation of the anode，but also formed a more stable composite protective film on the surface of aluminum anode，which effectively slowed down the selfcorrosion of hydrogen evolution and improved the utilization rate of the anode.In NaOH+PAAS+ZnO electrolytic liquid system，the dissolution of 6061 aluminum alloy was mainly controlled by the diffusion of charge in corrosion products or zinc salt deposition layer.After adding the composite corrosion inhibitor，the self - corrosion rate of 6061 aluminum alloy decreased from 0.496 4 mg/(cm2 ·min) to 0.275 0 mg/(cm2·min).Meanwhile，the inhibition rate reached 44.6%，the discharge voltage decreased from -1.381 V to -1.681 V，and the anode utilization rate increased by 13.5%.In general，the discharge performance of aluminum-air battery was obviously improved.

Key words： aluminum-air battery; 6061 aluminum anode; PAAS/ZnO; composite corrosion inhibitor; electrochemical activity

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