烟酸在铁钝化膜层表面的吸附机理

引用本文: 田惠文, 李伟华, 王大鹏, 侯保荣. 烟酸在铁钝化膜层表面的吸附机理[J]. 物理化学学报, 2012, 28(01): 137-145. doi: 10.3866/PKU.WHXB201228137 shu

Citation: TIAN Hui-Wen, LI Wei-Hua, WANG Da-Peng, HOU Bao-Rong. Adsorption Mechanism of Nicotinic Acid onto a Passive Iron Surface[J]. Acta Physico-Chimica Sinica, 2012, 28(01): 137-145. doi: 10.3866/PKU.WHXB201228137 shu

烟酸在铁钝化膜层表面的吸附机理

基金项目:
国家自然科学基金(51179182) (51179182)

山东省青岛市市南区科技发展基金(P2010-1-ZH-005) (P2010-1-ZH-005)

山东省博士后基金(BS2009HZ002) (BS2009HZ002)

香港王宽诚教育基金(20061231)资助项目 (20061231)

摘要: 循环伏安法结合原位拉曼光谱的表征结果表明, 烟酸在铁钝化膜层表面的吸附行为归因于其具有形成稳定膜层复合物的性能, 烟酸将间隙离子Fe^Ⅱ 转化为稳定的晶格离子Fe^Ⅲ, 从而降低铁钝化膜的溶解性. 旋转电极电化学晶体微天平的分析结果表明烟酸在活化态和钝化态铁表面的吸附行为遵循Langmuir-Freundlich 热力学规律, 并由此计算出过程中的吸附常数、标准自由能和非均质分布常数. 研究认为有机分子在钝化膜表面为化学型吸附, 可导致钝化膜破坏的间隙离子被烟酸固定在八面体空位晶格中形成稳定晶型结构, 并通过扫描电镜(SEM)和衰减全反射红外光谱(ATR FTIR)分析对结论进行了再次验证.

关键词:

烟酸
/ 铁钝化膜
/ 碱性介质
/ 吸附

English

Adsorption Mechanism of Nicotinic Acid onto a Passive Iron Surface

1.
1. Key Laboratory of Corrosion Science in Shandong, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, Shandong Province, P. R. China;
2. Graduate University of Chinese Academy of Sciences, Beijing 100049, P. R. China;
3. Key Laboratory of Rubber-Plastics of Ministry of Education and Shandong Province, Qingdao University of Science & Technology, Qingdao 266042, Shandong Province, P. R. China
Received Date: 30 June 2011
Available Online: 29 December 2011
Fund Project:
国家自然科学基金(51179182)

山东省青岛市市南区科技发展基金(P2010-1-ZH-005)

山东省博士后基金(BS2009HZ002)

香港王宽诚教育基金(20061231)资助项目

Abstract: Cyclic voltammetry and in situ Raman spectroscopy were used to determine the adsorption mechanism of nicotinic acid onto passive iron film surface. Its ability to form a surface complex tends to stabilize the interstitial Fe^Ⅱ in Fe^Ⅲ states and results in the progressive development of an insoluble film. Furthermore, an analytical investigation using a rotating electrochemical quartz crystal microbalance (rEQCM) showed that the adsorption isotherms of nicotinic acid onto iron in the active and passive states followed Langmuir-Freundlich behavior from which the adsorption constant, standard free energy of adsorption, and heterogeneity could be calculated. The organic molecules attach to the film surface by chemisorption and the interstitial cations are fixed in the octahedral sites giving stable nanocrystals. These assumptions were confirmed by scanning electron microscopy (SEM) and attenuated total reflection transform infrared (ATR FTIR) spectroscopy.

Key words:

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沈阳化工大学材料科学与工程学院沈阳 110142

烟酸在铁钝化膜层表面的吸附机理

English

Adsorption Mechanism of Nicotinic Acid onto a Passive Iron Surface

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

烟酸在铁钝化膜层表面的吸附机理

English

Adsorption Mechanism of Nicotinic Acid onto a Passive Iron Surface

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南： 你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

CCS Chemistry：静电组装导向聚合- 聚电解质纳米凝胶量化制备新策略

CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

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