Study on Corrosion Behavior of Carbon Steel in Methyldiethanolamine Solution Containing Heat-stable Salts

摘要N-甲基二乙醇胺(MDEA)在使用过程中发生降解作用生成热稳定性盐(HSS)，HSS的生成与积累是导致碳钢设备腐蚀加剧的重要原因。本文采用阳极极化曲线法、Tafel曲线法、EIS法等电化学手段，结合SEM和EDS法等现代表面分析技术以及挂片实验法，在研究MDEA底液浓度、各单一HSS阴离子对碳钢的腐蚀性，溶液温度、配对阳离子对HSS溶液腐蚀性影响的基础上，进一步研究了文献尚未见报道的多组分混合HSS体系对碳钢的腐蚀行为、溶解氧对HSS溶液腐蚀性的影响以及在含HSS的MDEA介质中碳钢的腐蚀反应控制过程等问题。为监测、控制实际生产过程的腐蚀问题提供了理论分析和实验依据。本论文分为5章：第1章...Abstract Methyldiethanolamine (MDEA) is one of the most important alkanolamine used in acid gas treating process. MDEA degradation causes the formation of heat-stable salts (HSS), which will lead to corrosion of equipment. In the present work, the corrosion behavior of carbon steel in MDEA solutions with HSS was investigated by electrochemical method, such as anodic polarization curve, Tafel curve...学位：理学硕士院系专业：化学化工学院化学系_分析化学学号：X20042500

Study on Determination of Potassium, Sodium, Magnesium, Calcium and Ammonium in Corns by Ion Chromatography

玉米中所含的许多矿物质都是人体重要的营养物质。如钠、钾可以调节细胞和血液的容量;钾还参与蛋白质、碳水化合物的代谢,帮助活化国家自然科学基金资助项目(No.20527005

以培养创新型人才为目标的分析化学实验教学改革

适应新形势下的教学要求,以培养创新型人才为目标,研究分析化学实验教学改革的思路与实践。通过优化课程结构体系,改进教学方法及教师自身素质的提升,实现学生加深对分析理论内容的理解,掌握好实验技术水平,提高学生的创新能力,从而适应社会发展的需要。广西民族大学化学与生态工程学院2010年度基础化学示范中心教学研究专

Exploration and Practice in Instrumental Analysis Courses for Chemical Engineering Major

教学质量是教师的生命线和永恒的追求,最优的教学效果是教师永久的目标.为了提高化工专业仪器分析课程教学质量与水平,该文对该专业教学中存在的问题进行了分析,在教学方法、教学内容、教学手段等方面进行了探索和改革,从而激发了学生的学习兴趣,有效地提高了教学质量及效果.The teaching quality is our lifeline and lasting pursue of our teacher. The optimal teaching performance is our permanent target. To improve the teaching quality and level of instrumental analysis courses for chemical engineering major, the paper analyzed some problems appearing in instrumental analysis teaching course of chemical engineering major. The characteristics of instrumental analysis teaching and chemical engineering major were bonded together, and teaching method and content and measure were ex- plored and reformed in the course of teaching. The results show that these adopted measures can inspire the students＇ interest, and improve the teaching quality and efficiency effectively.广西壮族自治区教育厅教研教改基金资助项目(桂教高教[2008]151号,桂教高教[2008]133号);广西民族大学2011年度高等教育教学改革工程立项项目(2011XJGD25

越南铜鼓样品铅的富集与铅同位素测定

在对越南80个铜鼓样品和相关铜器以及若干矿样进行成份分析的基础上,对样品进行了铅同位素测定,得出了一批可供进一步研究的实验数据国家自然科学基金资助项

CORROSION BEHAVIOR OF CARBON STEEL IN METHYLDIETHANOLAMINE SOLUTION CONTAINING HEAT-STABLE SALTS

利用阳极极化曲线法、Tafel曲线法和电化学阻抗谱法等技术,研究含有各种模拟热稳定性盐(HSS)的N-甲基二乙醇胺(MDEA)溶液在含氧与除氧条件下以及不同温度下对碳钢的腐蚀行为.结果表明,HSS的存在使碳钢的腐蚀速度加快.常温下HSS中的Cl-对碳钢的腐蚀性最强、可导致碳钢发生孔蚀;溶解氧的存在有利于降低既定HSS的腐蚀性.温度升高,碳钢的全面腐蚀速度增加,宏观孔蚀受到抑制;在含HSS的MDEA溶液中,碳钢腐蚀反应的阴极过程为电化学反应和扩散传质混合控制,阳极过程为电化学反应控制.In the present work,30 mass% methyldiethanolamine(MDEA)solutions containing various simulated heat-stable salts(HSS)were prepared.The corrosion behavior and the relevant corrosion rate-determining factors of carbon steel in the solutions were investigated by anodic polarization curve,Tafel curve and electrochemical impedance spectroscopy.It was showed that the corrosion rate of carbon steel in MDEA solution with HSS was double higher than that without HSS.Carbon steel might suffer from pitting corrosion in MDEA solutions containing chloride ions at ambient temperature.The corrosion rate of carbon steel in the solutions could be decreased when dissolved oxygen was existent.The general corrosion rate was increased as well as the pitting corrosion was inhibited at high temperatures.The rate of cathodic reduction was determined by both the electrochemical reaction and the diffusion process in MDEA solution with HSS.The rate-determining step of the anodic dissolution was electrochemical reaction in MDEA solution with HSS.国家自然科学基金项目(20527005)资

Study on Electrochemical Impedance Spectroscopy of Carbon Steel Eroded in Methyldiethanolamine Solution

应用电化学阻抗谱(EIS)研究碳钢在N-甲基二乙醇胺(MDEA)介质中的腐蚀行为.实验表明,未经预阴极活化处理的碳钢表面存在氧化膜,溶解氧促使它腐蚀速率增大,经活化处理去除氧化膜后则相反.在不含热稳定性盐(HSS)的MDEA溶液中,碳钢的腐蚀性随MDEA浓度的增加呈先上升后下降趋势;而在HSS高含量的溶液中,其腐蚀性则随MDEA浓度的增加而单调下降.在含有HSS模拟溶液中,碳钢的阳极极化EIS随极化电位由低到高分别出现感抗、负阻抗以及Warburg阻抗响应等特征,对应于孔蚀、活化状态向钝化状态过渡以及进入钝化的趋势,腐蚀反应的阴极过程表现为电化学反应和扩散传质混合控制,阳极过程为电化学反应控制.Corrosion behavior of carbon steel in methyldiethanolamine （MDEA） solution was investigated by Electrochemical Impedance Spectroscopy （EIS）. The results were showed that the corrosion rate of carbon steel in solution containing dissolved oxygen is higher than that in solution removed of dissolved oxygen before cathodic activation. They were reversed after cathodic activation. The corrosion rate is increased at first and then decreased when the concentration of MDEA is increased in the blank solutions. In the simulated solutions containing quantities of heat-stable salts （ HSS）, the corrosion rate is decreased monotonously with increase of the MDEA concentration. As anodic polarization potential is increased, the EIS of carbon steel in HSS simulated solution showed characteristics of inductive shrinkage, negative impedance and Warburg-respense, which implied pitting corrosion, transition from active state to passive state and passive state, respectively. The rate of cathodic reduction is determined by both electrochemical reaction and diffusion process. The rate-determining step of the anodic dissolution is electrochemical reaction.国家自然科学基金(20527005)资

基于多壁碳纳米管和溶胶-凝胶壳聚糖/SiO2杂化膜的安培型L-乳酸生物传感器

以γ-氨基丙基三乙氧基硅烷(APTES)为前驱体,首次研制了一种新型的基于溶胶-凝胶壳聚糖/二氧化硅和多壁碳纳米管(MWCNTs)的有机-无机杂化复合材料的安培型 L-乳酸生物传感器。在普鲁士蓝(PB)修饰的玻碳电极 (GC)表面用杂化复合膜以夹心法固定乳酸氧化酶(LOD)。考察了各种实验变量如酶的用量、pH、温度、工作电位等对生物传感器响应电流的影响。研究了传感器的分析特性和动力学参数,测得在引国家民委科研基金(05GX04);广西科学基金(0342018；0639025);广西高校中青年百名学科带头人基金(RC20060703005);广西教育厅科研基金(20050712);广西民族大学博士启动基金(0509QD015)项目资

Development of Analytical Chemistry and It's Teaching Reform

结合分析化学的发展,对当前分析化学教学中存在的问题进行了分析,提出了理工融合新体系分析化学课程体系、教学内容及教学方法改革的初步方案.Abstract:The development of analytical chemistry was summarized .The problems in present education of analytical chemistry were discussed .The reform measures of course system 、teaching content and teaching method of analytical chemistry were studied

Preparation and electrochemical characteristics of trivalent chromium-zirconium hybrid coatings on 6063 aluminum alloy

引言传统上使用六价铬转化膜来提高铝及其他金如锌及钢铁的防腐蚀性能[1-2]。然而,六价铬有毒,在电器及电子工业中,欧盟RoHS法规禁止使用六价铬化合物[广西产业重大科技攻关工程(1114003-2);广西民族大学引进人才科研启动基金(2009QD024