共查询到20条相似文献,搜索用时 0 毫秒
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利用电化学阻抗谱(EIS)方法研究了Al-Zn-In-Mg-Ti合金阳极在3%NaCl溶液中的腐蚀过程,观察了260h浸泡腐蚀后的表面形貌.结果表明:合金腐蚀是点蚀引起的,腐蚀由钝化态开始,经点蚀诱导期,达到点蚀稳定期.分别采用不同等效电路拟合合金在不同腐蚀阶段的电化学阻抗谱.结果表明:当合金处于钝化态时,EIS谱为反应电阻Rt很大的容抗弧;随浸泡时间的延长,EIS谱低频出现感抗弧,合金进入点蚀诱导期,溶液电阻R5增大,反应电阻Rt减小,蚀孔内反应电阻R0减小,感抗L收缩;合金处于点蚀稳定期时,EIS谱低频感抗弧消失,出现一直线,腐蚀产物扩散成为反应控制步骤. 相似文献
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混凝土中钢筋锈蚀的电化学阻抗谱特征研究 总被引:3,自引:0,他引:3
关于混凝土钢筋锈蚀等效电路模型中各元件的物理意义理解不尽相同.为了对模型元件的物理意义给出合理解释,设计了由氯盐侵蚀和混凝土碳化导致钢筋锈蚀的两种加速试验.通过对钢筋锈蚀试块阻抗谱特征的分析研究,对模型元件的物理意义给出了合理解释.研究发现,氯盐锈蚀试块具有三段容抗弧,即三个时间常数;而碳化锈蚀试块阻抗谱与钝化钢筋试块... 相似文献
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Protection of Metals and Physical Chemistry of Surfaces - Dynamic Electrochemical Impedance Spectroscopy (DEIS) has been used as an effective method for determining information about corrosion and... 相似文献
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Menshikov I. A. Shein A. B. Lukyanova N. B. 《Protection of Metals and Physical Chemistry of Surfaces》2018,54(7):1292-1297
Protection of Metals and Physical Chemistry of Surfaces - The adsorption and protective properties of the corrosion inhibitors SolIng IK-2, IK-3, and IK-4(A) are studied by the method of... 相似文献
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V. Yu. Vasil''ev T. K. Sergeeva Yu. V. Baldokhin E. S. Ivanov V. V. Novosadov V. Ya. Bayankin 《Protection of Metals》2002,38(2):166-171
The results of field tests carried out at main gas pipelines (MP) are shown. The distribution of internal stresses along the MP perimeter is obtained. Polarization currents at differently strained pipeline fragments are determined in soils taken at different distances from the failure epicenter. The mechanoelectrochemical effect is shown to be twice greater in failure soils. Its value can serve as a criterion of the stress corrosion probability. 相似文献
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2205和316L不锈钢在氢氟酸中的电化学腐蚀行为 总被引:1,自引:0,他引:1
通过动电位极化和电化学阻抗方法考察了2205双相不锈钢和316L不锈钢在5%(体积分数)HF溶液中的电化学行为,借助Mott-Schokkty曲线分析了两种不锈钢表面钝化膜的半导体特性。结果表明:两种不锈钢在氢氟酸溶液中都能发生钝化,且2205双相不锈钢的钝化区间范围更宽,维钝电流密度更低。2205双相不锈钢表面钝化膜表现出更高的钝化膜电阻和电荷转移电阻,其抗氢氟酸腐蚀性能优于316L不锈钢,这主要与2205双相不锈钢中的Mo和Cr含量高、表面钝化膜缺陷少、钝化膜易修复等因素有关。 相似文献
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等效电路拟合钢筋锈蚀行为的电化学阻抗谱研究 总被引:1,自引:0,他引:1
简述了混凝土中钢筋锈蚀的电化学阻抗谱测试常用的等效电路,对比分析了不同等效电路的优劣性.根据混凝土中钢筋的钝化、初锈与锈蚀发展期三个阶段选取相应的等效电路进行拟合分析.结果表明,随着钢筋锈蚀的发展,等效电路拟合时需要增加时间常数;应用常相角元件CPE和Warburg扩散元件能更好地进行阻抗谱拟合. 相似文献
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Electrochemical noise data in the presence of different corrosion types were analyzed.A correlation between the corrosion type of the observed noise and the entropy rate was recognized.A sequence was transformed from each set of original electrochemical noise signal,then the Markov process M and stationary distribution l were calculated.Finally,entropy rate of each sequence was obtained by the definition.From the entropy rate,it has been observed that local corrosion showed a lower entropy rate,while uniform corrosion showed a higher entropy rate. 相似文献
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探讨了Kramers-Kronig转换对交流阻抗典型的数学模型的适用性,提出一种新的用于Kramers-Kronig转换进行数值解析的方法-牛顿-科茨公式法,并对Q235钢在添加咪唑啉缓蚀剂的饱和CO2盐水中的交流阻抗数据进行Kramers-Kronig转换.结果表明典型的数学模型适用于Kramers-Kronig转换,Q235钢分别在空白盐水中和添加25 ppm缓蚀剂144 h的体系中,试验数据符合阻抗的四个基本条件,而在添加缓蚀剂1 h时不符合,体系不稳定. 相似文献
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Metal Science and Heat Treatment - 相似文献
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Oxidation of Metals - Metal dusting is an aggressive form of corrosive degradation that Fe?, Ni? and Co-base, high-temperature alloys undergo when subjected to environments... 相似文献
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Domínguez Adrian Sosa López René Antaño Bueno José de Jesús Pérez López Coraquetzali Magdaleno Cruz José Santos Hernández José de Jesús Coronel Dector Andres 《Protection of Metals and Physical Chemistry of Surfaces》2022,58(3):639-647
Protection of Metals and Physical Chemistry of Surfaces - The external corrosion of a pipeline buried or submerged under specific conditions was studied. The pipelines were made of API 5L X52 steel... 相似文献