Corrosion behaviour and mechanism of nickel anode in SO42- containing molten Li2CO3-Na2CO3-K2CO3

Corrosion behaviour and mechanism of nickel anode in SO42- containing molten Li2CO3-Na2CO3-K2CO3
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镍阳极在含SO42熔融Li2CO3-Na2CO3-K2CO3中的腐蚀行为及机理

DOI:
10.1016/j.corsci.2020.108450
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发表时间:
2020-04
期刊:
影响因子:
8.3
通讯作者:
Dihua Wang
Dihua Wang
中科院分区:
材料科学1区
文献类型:
--
作者:
Peilin Wang;Kaifa Du;Yanpeng Dou;Hua Zhu;Dihua Wang

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为了开发一种用于烟气捕获和利用的耐腐蚀阳极,在0-2 mol% SO42−的li2co3 - na2co3 - k2co3熔融液中,在650 ~ 800 °C的阳极极化温度范围内系统地研究了SO42−对镍腐蚀行为的影响。在650 ℃下,当so42浓度大于0.1 mol%时,镍的腐蚀速度大大加快。发现侵略性SO42−引起NiO膜的点蚀和剥落。有趣的是,提高电解液温度可以有效地提高镍阳极的抗点蚀性。
Aiming to develop a corrosion resistant anode for flue-gas capture and utilization, the effect of SO42−on the corrosion behaviour of nickel was systematically investigated under anodic polarization over a temperature range of 650−800 °C in molten Li2CO3-Na2CO3-K2CO3with 0–2 mol% SO42−. The corrosion of nickel is profoundly accelerated when the concentration of SO42-is over 0.1 mol% at 650 °C. Pitting corrosion and spallation of NiO film caused by the aggressive SO42−were identified. Interestingly, the resistance of nickel anode to pitting corrosion can be effectively enhanced by increasing electrolyte temperature.
DOI: 10.1016/s0010-938x(01)00134-2
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