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›› 2010, Vol. 10 ›› Issue (2): 400-404.

• 材料工程专栏 • 上一篇    下一篇

粉煤灰超细纤维耐腐蚀性能

张泽武 陈建定 吴秋芳 马新胜   

  1. 华东理工大学国家超细粉末工程研究中心 华东理工大学材料科学与工程学院 华东理工大学材料科学与工程学院 华东理工大学材料科学与工程学院
  • 收稿日期:2009-12-28 修回日期:2010-03-02 出版日期:2010-04-20 发布日期:2010-04-20
  • 通讯作者: 陈建定

Anti-corrosion Performance of Superfine Fly Ash Fiber

ZHANG Ze-wu, CHEN Jian-ding WU Qiu-fang MA Xin-sheng   

  1. National Engineering Research Center of Ultrafine Powder, East China University of Science and Technology School of Materials Science and Engineering, East China University of Science and Technology School of Materials Science and Engineering, East China University of Science and Technology School of Materials Science and Engineering, East China University of Science and Technology
  • Received:2009-12-28 Revised:2010-03-02 Online:2010-04-20 Published:2010-04-20
  • Contact: CHEN Jian-ding

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被引次数

18

摘要： 粉煤灰超细纤维(FAF)在水、NaOH溶液、H2SO4溶液腐蚀介质中于100℃下腐蚀3 h，分别考察了极端过程中FAF的表面特性，并分析了腐蚀前后FAF质量、比表面、微观形貌、成分和结构的变化，测定了腐蚀后残液组分及含量. 结果表明，FAF失重率随腐蚀介质pH升高而减小，浸出离子的同时腐蚀介质pH升高；经水腐蚀后，FAF失重率为12.9%，表面出现微小坑洼；经0.25 mol/L NaOH溶液腐蚀后，失重率为4.6%，表面被刻蚀形成沟壑，Si和Al含量没有大变化，比表面积由0.129 m2/g增至5.486 m2/g，表面Si?OH振动吸收峰明显变弱；经0.25 mol/L H2SO4溶液腐蚀后，失重率为18.9%，宏观形貌变碎，Si, Al和Ca等大量浸出，红外图谱呈现SO42-的特征峰. 碱金属离子的浸出和网络结构中含Si成分的溶解为腐蚀的主要机制.

关键词: 粉煤灰, 超细纤维, 耐腐蚀, 表面改性, 腐蚀机理

Abstract: The surface properties of micro fly ash fiber (FAF) were investigated in the corrosive media of water, H2SO4 solution, NaOH solution under the conditions of 100℃ and 3 h. The changes of weight, specific surface area, micro-morphology, composition and structure of FAF before and after corrosion were examined, and composition of residual solution analyzed by ICP. The results showed that weight loss of FAF increased with the decrease of pH value in the corrosive medium, and that the pH of corrosive medium increased by the leached ions at the same time. The surface of FAF was etched in many small potholes and weight lost 12.9% under water corrosion. Its weight lost 4.6% under 0.25 mol/L of NaOH solution corrosion with surface etched to ravines and the surface Si?OH vibration absorption peak significantly declined, meanwhile Si and Al concentrations changed less and specific surface area increased from 0.129 to 5.486 m2/g. Whereas, FAF was broken and weight lost 18.9% with the Si, Al, Ca substantive leaching under 0.25 mol/L H2SO4 solution corrosion, with the FT-IR diagram showing the characteristic peaks of SO42-. It shows that alkali metal ion leaching and network structure with Si component dissolving in the solution are the main corrosion mechanism.

Key words: fly ash, superfine fiber, corrosion resistance, surface modification, corrosion mechanism

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