外加交流电场对薄液膜中氧扩散的影响

doi:10.11902/1005.4537.2014.233

中国腐蚀与防护学报

2015, Vol. 35

Issue (6): 549-555 DOI: 10.11902/1005.4537.2014.233

研究报告

本期目录 | 过刊浏览

外加交流电场对薄液膜中氧扩散的影响

陈启萌¹,张俊喜¹(

),原徐杰^1,²,戴念维¹

1. 上海电力学院上海市电力材料防护与新材料重点实验室上海 200090
2. 上海中挪海事有限公司上海 210417

Effect of Alternating Electric Field on Diffusion Coefficient of Oxygen in Thin Electrolyte Layer

Qimeng CHEN¹,Junxi ZHANG¹(

),Xujie YUAN^1,²,Nianwei DAI¹

1. Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power, Shanghai University of Electric Power, Shanghai 200090, China
2. China Classification Society-Det Norske Veritas Technology Institute, Shanghai 210417, China

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摘要:

采用计时电流法测定了交流电场作用下O₂在薄液膜中的扩散系数。考察了计时电流法测定氧扩散系数这一方法在薄液膜体系和电场环境下应用的可行性,研究了薄液膜体系中液膜厚度以及外加电场对氧扩散系数的影响。结果表明,O的扩散系数随着薄液膜厚度的减小而增大,随着交流电场强度的增强而增大。交流电场对O扩散系数的影响可能是其加速了O通过气/液界面到达电极表面的过程。薄的液膜和强的电场会加快金属腐蚀的阴极过程中O的传输,从而加速金属腐蚀。

关键词 ：计时电流法, 大气腐蚀, 氧还原反应, 动力学参数, 薄液膜

Abstract：

Effect of an applied alternating electric field on the oxygen diffusion coefficient in thin electrolyte layers on an electrode of stainless steel was investigated by chronoamperometry. The results show that the oxygen diffusion coefficient increased with the decrease in TEL thickness, as well as the increase in AEF strength. The effect of AEF on the oxygen diffusion coefficient is found to be due to that the migration of oxygen form the gas/liquid interface to electrode surface was accelerated by the applied electric field. For a thinner electrolyte layer by a stronger applied electric field, the cathodic process of the electrode would be more intensive,which corresponds to higher corrosion rate of metal.

Key words： chronoamperometry atmospheric corrosion oxygen reduction kinetic parameter thin electrolyte layer

基金资助:国家自然科学基金项目 (51271110) 和上海市教委科研创新重点项目 (12ZZ170) 资助

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陈启萌,张俊喜,原徐杰,戴念维. 外加交流电场对薄液膜中氧扩散的影响[J]. 中国腐蚀与防护学报, 2015, 35(6): 549-555.
Qimeng CHEN, Junxi ZHANG, Xujie YUAN, Nianwei DAI. Effect of Alternating Electric Field on Diffusion Coefficient of Oxygen in Thin Electrolyte Layer. Journal of Chinese Society for Corrosion and protection, 2015, 35(6): 549-555.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2014.233 或 https://www.jcscp.org/CN/Y2015/V35/I6/549

图1 外电场作用下薄液膜腐蚀实验装置图

图2 无外加电场作用下的Pt电极在不同厚度0.35%NaCl薄液膜下的阴极极化曲线

图3 无外加电场作用下的Pt电极在不同厚度0.35%NaCl薄液膜下的脉冲曲线和1/[iF(t )]2对时间曲线

图4 无外加电场作用下的Pt电极在不同厚度的0.35%NaCl薄液膜下的Δ{1/[iF(t )]2}/Δt对时间曲线

图5 不同交流电场强度下O的D/D0值随薄液膜厚度的变化

图6 不同厚度薄液膜下O的D/D0随交流电场强度的变化

图7 不同强度的交流电场下不同薄液膜厚度的Δ{1/[iF(t )]2}/Δt对时间曲线

图8 有/无电场条件下的双电层模型

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