| 引用本文: | 聂向晖,李晓刚,杜翠薇,沈庆红.Q235碳钢在滨海盐土中腐蚀的电极过程特点[J].材料科学与工艺,2010,18(1):38-42.DOI:10.11951/j.issn.1005-0299.20100109. |
| NIE Xiang-hui,LI Xiao-gang,DU Cui-wei,SHEN Qing-hong.Electrode process characteristics of Q235 carbon steel corroded in the seashore salt soil[J].Materials Science and Technology,2010,18(1):38-42.DOI:10.11951/j.issn.1005-0299.20100109. |
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| 摘要: |
| 为了研究含水量对Q235碳钢在滨海盐土中腐蚀电极过程的影响,分别在10%、20%和34%含水土壤中,在±50mV极化及开路条件下对Q235碳钢的电化学阻抗谱进行了测量.实验结果表明:在低含水量(10%)时,Q235腐蚀的阴极过程主要受电荷转移电阻和结合层电阻控制,结合层对阳极过程的阻碍明显大于阴极过程;在中、高含水量(20%,34%)时,其阴极过程表现为明显的扩散控制特征,结合层主要影响阳极溶解过程,其对阴极反应的影响可以忽略不计.随含水量的增加,Q235的阳极反应电荷转移电阻逐渐降低;阴极扩散控制作用越来越明显. |
| 关键词: 含水量 电化学阻抗谱 电极反应 扩散控制 |
| DOI：10.11951/j.issn.1005-0299.20100109 |
| 分类号:TG172.4 |
| 基金项目:科技部国家科学基础条件平台建设项目(2005DKA10400);国家科技支撑计划课题(2006BAK02B01-06) |
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| Electrode process characteristics of Q235 carbon steel corroded in the seashore salt soil |
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NIE Xiang-hui1,2, LI Xiao-gang1, DU Cui-wei1, SHEN Qing-hong3
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1.Center of Corrosion and Protection,Materials Science and Engineering School,University of Science and Technology Beijing,Beijing 100083,China;2.Tubular Goods Research Center of China National Petroleum Corporation,Xian 710065,China;3.Engineering Quality Supervision Station of Petrochina Jidong Oil Field,Tangshan 063200,China
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| Abstract: |
| The effect of water content on the electrode process of Q235 carbon steel corroded in the seashore salt soil was studied by using electrochemical impedance spectrum (EIS) measurements at ± 50 mV polarization potential and open circuit potential with water content of 10% ,20% and 34% . When the water content was 10% ,the cathodic process was mainly affected by charge transfer resistance (Rt) and the resistance of bonding layer (R1),and the bonding layer blocked anodic process more heavily than cathodic process. When the water content was 20% and 34% ,the cathodic process was mainly presented as diffusion controlled,and the bonding layer mainly affected the process of anodic dissolution. With the increase of water content,the charge transfer resistance of anodic reaction reduced gradually,while the effect of the cathodic diffusion control became more and more obvious. |
| Key words: water content EIS electrode reaction diffusion control |
