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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......
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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] ......
sodium aluminate was investigated by high temperature corrosion test conducted in steel bombs and analysis technologies of SEM and XRD. Polarization curve method was used to examine the origins... when the solution is stirred. Polarization studies at lower temperature show that, accelerated corrosion is attributed to the formation of unstable iron sulfide with unprotected structure on the surface......
with Sc element were investigated by means of constant temperature immersion corrosion method, electrochemical polarization curves measure, slow strain rate test (SSRT), scanning electron microscopy... by electrochemical polarization curves. T73 temper has low susceptibility of stress corrosion cracking (SCC) compared with T6 temper at the same strain rate. Meanwhile, the alloy is more susceptible......
-circuit potential; polarization resistance; dichromate; sulfuric acid; diffusion process; [全文内容正在添加中] ......
5A05铝合金黑色氧化膜的结构及耐蚀性能 王爱荣1,朱芳坤1,杨凤霞1,安彩霞1 (1.河南科技学院化学化工学院,新乡,453003) 摘要:用两步化学氧化法在铝合金表面获得了黑色氧化膜.利用全浸渍腐蚀试验及电化学极化曲线评价了膜的耐蚀性能,利用扫描电子显微镜观察膜的表面形貌,采用能量散射谱(EDS)测定膜的成分.结果表明:铝合金的黑色氧化膜具有网块状结构,膜层主要由O,Al,Mn,Co,Cr五种元素所组成,未经封闭的铝合金氧化膜的耐蚀性能很差,而经重铬酸钾封闭后,耐蚀性大为提高. 关键词:铝合金; 氧化膜; 电化学极化曲线; 形貌; 耐蚀性能; Aluminium alloy; Oxidation film; Electrochemical polarization curve; Morphology; Corrosion-proof; [全文内容正在添加中] ......
Received 1 March 2010; accepted 11 June 2010 Abstract: The electrochemical behaviors of Ta in tetrabutylammonium hydrogen sulfate (TBAHS) ethanol solutions were studied using potentiodynamic polarization... are presented when the potential is higher than 2.0 V. Key words: anhydrous ethanol; electrochemical impedance spectra; polarization curve; tantalum; tetrabutylammonium hydrogen sulfate 1 Introduction Tantalum......
, and the electrochemical corrosion behavior was investigated mainly by polarization curve and impedance spectroscopy. The mass loss rate, corrosion area rate and corrosion depth were researched by the salt... sample. The semi-solid processing can improve the corrosion resistance of 7A04 aluminum alloy obviously. Key words: 7A04 aluminum alloy; semi-solid; as-cast; polarization curve; impedance spectroscopy......