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金属学报  2015, Vol. 51 Issue (5): 631-640    DOI: 10.11900/0412.1961.2014.00602
  论文 本期目录 | 过刊浏览 |
基于扫描电化学显微镜产生/收集和反馈模式研究纯Mg腐蚀行为*
王新印,夏妍,周亚茹,聂林林,曹发和(),张鉴清,曹楚南
浙江大学化学系, 杭州 310027
CORROSION BEHAVIOR OF PURE Mg BASED ON GENERATION/COLLECTION AND FEEDBACK MODES OF SCANNING ELECTROCHEMICAL MICROSCOPY
Xinyin WANG,Yan XIA,Yaru ZHOU,Linlin NIE,Fahe CAO(),Jianqing ZHANG,Chunan CAO
Department of Chemistry, Zhejiang University, Hangzhou 310027
引用本文:

王新印, 夏妍, 周亚茹, 聂林林, 曹发和, 张鉴清, 曹楚南. 基于扫描电化学显微镜产生/收集和反馈模式研究纯Mg腐蚀行为*[J]. 金属学报, 2015, 51(5): 631-640.
Xinyin WANG, Yan XIA, Yaru ZHOU, Linlin NIE, Fahe CAO, Jianqing ZHANG, Chunan CAO. CORROSION BEHAVIOR OF PURE Mg BASED ON GENERATION/COLLECTION AND FEEDBACK MODES OF SCANNING ELECTROCHEMICAL MICROSCOPY[J]. Acta Metall Sin, 2015, 51(5): 631-640.

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摘要: 

应用扫描电化学显微镜的产生/收集和反馈模式, 研究纯Mg在NaCl和Na2SO4溶液中腐蚀过程中的微区(点、线、面)析氢行为和活性点的演变过程. 实验结果显示, 无论在NaCl还是Na2SO4溶液中, 阴极极化和阳极极化均促进析氢, 与传统集气法获得的纯Mg腐蚀过程存在负差数效应一致, 但析氢速率在微区范围内波动加大, 不稳定, 且与极化程度有关. 析氢速率随NaCl浓度增加而增加, 但随Na2SO4浓度增加而减少. NaCl浓度增大、pH值降低、阳极极化有利于Mg表面活性点的产生.

关键词 扫描电化学显微镜(SECM)纯Mg析氢活性点    
Abstract

Since electrochemical impedance spectroscopy, polarization curve and hydrogen collection were the main technologies for corrosion research of Mg and its alloy. However, those methods only provide the mean information of entire surface of corrosion electrode. In this work, H2 evolution and active sites of pure Mg from localized sites (point, line and surface) in NaCl and Na2SO4 solution based on generation/collection and feedback modes of scanning electrochemical microscopy (SECM) were studied. The results indicate that both cathodic and anodic polarization are in favor of H2 evolution in NaCl and Na2SO4 solution, which is well in line with the negative difference effect by the classical H2 collection, but the SECM results show that the H2 evolution in localized sites is not uniform and stable. The H2 evolution rate increases with NaCl concentration increasing, which is opposite in Na2SO4 solution. The higher NaCl concentration, anodic polarization and lower pH value accelerate the formation of active sites on pure Mg surface.

Key wordsSECM    pure Mg    hydrogen evolution    active site
收稿日期: 2014-10-31     
基金资助:* 国家自然科学基金项目51171172和51131005, 以及中央高校基本科研业务费专项资金项目2015QNA3011资助
作者简介: 王新印, 男, 1989年生, 硕士生
图1  典型探针氧化H2电流与时间的变化曲线
图2  扫描电化学显微镜(SECM)产生/收集模式和反馈模式示意图
图3  纯Mg在0.1 mol/L NaCl和0.1 mol/L Na2SO4中不同过电位下探针氧化H2电流
图4  纯Mg在0.1 mol/L Na2SO4溶液中不同极化电位下的线扫描结果和面扫描结果
图5  纯Mg在不同浓度NaCl和Na2SO4溶液中的探针氧化H2电流
图6  纯Mg在开路电位下, 不同浓度NaCl和Na2SO4溶液中线扫描结果
图7  纯Mg在0.1和0.5 mol/L NaCl溶液中不同时间的面扫描图像
图8  纯Mg在0.1 mol/L NaCl溶液中不同极化电位、不同时间的面扫描图像
图9  纯Mg在0.1 mol/L NaCl溶液中不同pH值、不同时间的面扫描图像
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