共搜索到2246条信息,每页显示10条信息,共225页。用时:0小时0分0秒406毫秒
模拟混凝土孔隙液中钢筋表面膜组成与腐蚀行为的关联陈雯1,杜荣归1,胡融刚1,时海燕1,朱燕峰1,林昌健1(1.福建省厦门市厦门大学化学化工学院化学系固体表面物理化学国家重点实验室)摘 要:采用XPS分析钢筋经模拟混凝土孔隙液浸泡后表面膜的化学组成,结合线性极化法和动电位扫描阳极极化曲线测试,研究钢筋在模拟混凝土孔隙液中表面膜化学组成与腐蚀电化学行为的关联.结果表明:钢筋在纯模拟液中处于钝化状态.在含Cl和不同pH值的模拟混凝土孔隙液中,随着Cl-浓度的增加和pH值的降低,钢筋的腐蚀电位负移,电流密度增大;钢筋表......
盐酸介质中3,5-二(2-噻吩基)-1,2,4-三唑(2-TAT)对紫铜的缓蚀作用 刘瑛1,杨文忠1,唐永明1,陈云1,王锦堂1 (1.南京工业大学,理学院,南京,210009) 摘要:采用动电位极化曲线和电化学阻抗谱技术研究了3,5-二(2-噻吩基)-1,2,4-三唑(2-TAT)在1mol/LHCl介质中对紫铜的缓蚀作用.结果表明,2-TAT为阴极型缓蚀剂,阻抗参数的变化表明2-TAT吸附在紫铜表面,形成保护膜,其吸附方式遵循Langmuir吸附等温式. 关键词:缓蚀剂; 紫铜; 极化曲线; 交流阻抗; inhibitor; copper; polarization curves; electrochemical impedance; [全文内容正在添加中] ......
, and the atomic displacements in the phase transition were calculated by the atomic coordinate analysis. The spontaneous polarization in SrBi4Ti4O15 was studied based on the atomic displacements and atomic effective valence electrons numbers. The calculated spontaneous polarization strength in ferroelectric SrBi4Ti4O15 along the a axis is 25.81 μC/cm2, which is in good agreement with the experimental......
+, Cl-, NO3- and NH3·H2O, or the combination of them. Parameters, such as corrosion potential, corrosion current density, linear polarization resistance, pitting potential, repassivation potential, pit transition potential, and charge transfer resistance are obtained from cyclic polarization curve and electrochemical impedance spectroscopy (EIS). The results show that H+, Cl-, NH3·H2O and OH......
at an elbow of loop system based on array electrode technology by polarization, computational fluid dynamics (CFD) simulation and surface analysis. The experimental results showed that the corrosion... (CFD); polarization 1 Introduction Corrosion, especially flow-assisted corrosion (FAC), is one of the main reasons resulting in failure of the heat exchanger in cooling system [1-4]. Magnesium alloys......
高铬耐候钢的电化学行为研究 姜茂发1,刘承军1,王博2,郑春玉3,王德永1,郑艳3 (1.东北大学材料与冶金学院,沈阳,110004;2.东北大学材料与冶金学院,沈阳110004;3.莱钢集团,技术研发中心,莱芜271104) 摘要:应用动电位扫描和电化学阻抗谱(EIS)技术研究了高铬含量对耐候钢电化学行为的影响.动电位扫描极化曲线结果表明,增大钢中铬质量分数可以提升耐候钢的自腐蚀电位E0,降低耐候钢腐蚀速率;电化学阻抗谱分析结果则显示高铬耐候钢具有较致密有效的腐蚀产物膜,抵御离子传导能力增强. 关键词:耐候钢; 铬; 极化曲线; 电化学阻抗谱; Weathering steel; Cr; polarization curve; EIS; [全文内容正在添加中] ......
X80管线钢在NaHCO3溶液中的阳极电化学行为周建龙1,李晓刚1,杜翠薇1,李云玲1,李涛1,潘莹2(1.北京市北京科技大学腐蚀与防护中心2.武汉材料保护研究所)摘 要:采用动电位极化曲线,动电位电化学阻抗谱(DEIS)和SEM研究了X80管线钢在NaHCO3溶液中的阳极电化学行为,结果表明:随着HCO3-浓度增加,X80管线钢腐蚀速率呈现先增加,后减小的趋势,X80管线钢"钝化"的临界HCO3-浓度为0.009 mol/L.随着HCO3-浓度增加,极化曲线阳极电流峰发生变化,当HCO3-浓度低于0.009 ......
decreasing. Key words: magnesium alloy; calcium; microstructure; mechanical properties; corrosion; polarization curves Polarization curves of AZC alloys 表2 AZC系列合金电化学腐蚀数据 Table 2 Electrochemical corrosion data of AZC alloys 3 讨论 Song等[16]在研究中发现, AZ91D合金表面β相(Mg17Al12)的体积分数大且呈网状连续分布, 起到阻......
......
TGS和GTGS热释电晶体的热力学模型模拟曲线 张万里1,杨传仁1,廖希异1,胡文成1 (1.电子科技大学,微电子与固体电子学院,四川,成都,610054) 摘要:通过热力学推导,建立了零电场下热释电晶体的极化与温度的方程.由热释电系数的定义,对热释电晶体的极化方程对温度求导,得出由热力学模型建立的热释电方程.并对热释电晶体硫酸三甘氨酸(TGS)和掺胍TGS(GLTGS)的实验曲线进行了模拟,该理论基本符合. 关键词:热释电晶体; 极化方程; 热力学模型; 热释电方程; thermodynamics model; pyroelectric crystal; polarization equation; pyroelectric equation; [全文内容正在添加中] ......