Electrochemical Corrosion Behavior of Carbon Steel under Thin Electrolyte Layer Containing NaCl
摘 要
在自建大气腐蚀薄液膜电化学测试装置上, 采用极化曲线及电化学阻抗谱研究了碳钢在NaCl薄液膜下的腐蚀电化学特征。结果表明, 液膜厚度较大时, 氧扩散困难, 腐蚀速率较慢; 随着液膜厚度的减小, 氧和腐蚀产物的扩散都相对容易, 腐蚀速率增加。液膜厚度为350 μm时, 腐蚀电流密度和极限扩散电流密度最大, 腐蚀速率最大。液膜厚度继续减薄, 阳极过程受到抑制, 腐蚀速率减小。碳钢在350 μm NaCl薄液膜下腐蚀初期阻抗谱由一个高频容抗弧和一个低频扩散阻抗组成, 继续腐蚀阻抗谱由一个高频容抗弧和一个低频容抗弧组成, 均表现为两个时间常数。由于Cl-的强侵蚀性破坏和疏松多孔的腐蚀产物的生成, Rct不断减小, 腐蚀速率增加。
Abstract
The self-built electrochemical measurement system of thin electrolyte layer was utilized to investigate the electrochemical characteristics of carbon steel corrosion under thin electrolyte layer containing Cl- by means of polarization curves and electrochemical impedance spectroscopy. In the case of a thicker electrolyte layer, a slower corrosion rate can be observed due to the difficult oxygen diffusion. With the thinning of electrolyte layer, the diffusion of oxygen and corrosion products becomes relatively easy, which promotes the corrosion process. The corrosion current density and limiting diffusion current density reach the maximum value at 350μm in layer thickness, which reveals the easiest corrosion tendency and the biggest corrosion rate. As the thickness of the electrolyte layer is reduced, the anodic process is inhibited and the corrosion rate slows down. The Nyquist curves for initial corrosion process consists of capacity reactance arc at high frequency and diffusion impedance at low frequency. As corrosion continues, the Nyquist curve comprises capacity reactance arc at high frequency and capacity reactance arc at low frequency, and all show two time constants. Electron transfer resistance decreases, suggesting the increase of corrosion rate with corrosion time, which results from the strong attack of chloride ion and the formation of loose and porous corrosion products.
中图分类号 TG174
所属栏目 试验研究
基金项目 国家自然科学基金(50601012); 江西省自然科学基金(2009GQC0110)
收稿日期 2013/5/30
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联系人作者林翠(lincwi@126.com)
备注林翠(1976-), 教授, 博士, 从事材料的腐蚀与防护研究,
引用该论文: LIN Cui,XIAO Zhi-yang. Electrochemical Corrosion Behavior of Carbon Steel under Thin Electrolyte Layer Containing NaCl[J]. Corrosion & Protection, 2014, 35(4): 316
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【3】王光雍, 王海江, 李兴濂. 自然环境的腐蚀与防护-大气·海水·土壤[M]. 北京:化学工业出版社, 1997.
【4】托马晓夫著. 金属腐蚀及其保护理论[M]. 北京:中国工业出版社, 1964.
【5】WALL F D, MARTINEZ M A, MISSERT N A, et al. Characterizing corrosion behavior under atmospheric conditions using electrochemical techniques[J]. Corrosion Science, 2005, 47(1):17-32.
【6】HUANG H L, GUO X P, ZHANG G A, et al. The effects of temperature and electric field on atmospheric corrosion behavior of PCB-Cu under absorbed thin electrolyte layer[J]. Corrosion Science, 2011, 53:1700-1707.
【7】WEISSENRIEDER J, LEYGRAF C. In situ studies of filiform corrosion of iron[J]. Journal of The Electrochemical Society, 2004, 151(3):B165-B171.
【8】NISHIKATA A, ICHIHARA Y, HAYASHI Y, et al. Influence of electrolyte layer thickness and pH on the initial stage of the atmospheric corrosion of iron[J]. Journal of Electrochemical Society, 1997, 144(4):1244-1252.
【9】HUANG H L, DONG Z H, CHEN Z Y, et al. The effects of Cl- ion concentration and relative humidity on atmospheric corrosion behavior of PCB-Cu under adsorbed thin electrolyte[J]. Corrosion Science, 2011, 53:1230-1236.
【10】陈崇木, 崔宇, 张涛, 等. 电化学方法研究纯镁在薄液膜下的腐蚀行为I O2对纯镁在薄液膜的腐蚀行为的影响[J]. 腐蚀科学与防护技术, 2009, 21(2):94-96.
【11】CHENG Y L, ZHANG Z, CAO F H, et al. A study of the corrosion of aluminum alloy 2024-T3 under thin electrolyte layers[J]. Corrosion Science, 2004, 46:1649-1667.
【12】程英亮. 铝合金在本体溶液以及薄层液膜下腐蚀的电化学研究[D]. 杭州:浙江大学硕士学位论文, 2003.
【13】张学元, 柯克, 杜元龙. 金属在薄层液膜下电化学腐蚀电池的设计[J]. 中国腐蚀与防护学报, 2001, 21(2):117-122.
【14】李明齐, 蔡铎昌, 何晓英. H2S薄层液膜下16Mn钢腐蚀的电化学研究[J]. 材料保护, 2006, 39(1):1-6.
【15】林翠, 洪昕培. 一种气体环境中薄液膜下金属腐蚀行为测试方法: 中国, CN101788454A[P]. 2010-07-28.
【16】林翠, 洪昕培. 用于大气腐蚀测试的薄液膜控制装置: 中国, CN201477032U[P]. 2010-05-19.
【17】张学元, 柯克, 杜元龙. 金属在薄层液膜下电化学腐蚀电池的设计[J]. 中国腐蚀与防护学报, 2001, 21(2):117-122.
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