期刊文献+
共找到4篇文章
< 1 >
每页显示 20 50 100
An Explanation on the Electron Ionization Mass Spectra of Crown Ethers by MNDO Computational Method
1
《Chemical Research in Chinese Universities》 SCIE CAS CSCD 1995年第3期202-205,共4页
he bond lengths and bond orders of four kinds of chemical bonds in crownethers(15) were calculated based on the model molecules using MNDO method.With the calculation results, some predictions to the EI mass spectral ... he bond lengths and bond orders of four kinds of chemical bonds in crownethers(15) were calculated based on the model molecules using MNDO method.With the calculation results, some predictions to the EI mass spectral fragmenta-tion behaviour of crown ethers are suggested. The EI mass spectra of studied crownethers are in satisfactory agreenient with the predictions. 展开更多
关键词 Crown ether MNDO method. EI mass spectra
下载PDF
Effectiveness of inhibitors in increasing chloride threshold value for steel corrosion 被引量:12
2
作者 Jin-xia XU Lin-hua JIANG +2 位作者 Wei-lun WANG Li TANG Li CUI 《Water Science and Engineering》 EI CAS CSCD 2013年第3期354-363,共10页
This investigation was aimed at evaluating the effectiveness of corrosion inhibitors in increasing the chloride threshold value for steel corrosion. Three types of corrosion inhibitors, calcium nitrite (Ca(NO2)2),... This investigation was aimed at evaluating the effectiveness of corrosion inhibitors in increasing the chloride threshold value for steel corrosion. Three types of corrosion inhibitors, calcium nitrite (Ca(NO2)2), zinc oxide (ZnO), and N,N'-dimethylaminoethanol (DMEA), which respectively represented the anodic inhibitor, cathodic inhibitor, and mixed inhibitor, were chosen. The experiment was carried out in a saturated calcium hydroxide (Ca(OH)2) solution to simulate the electrolytic environment of concrete. The inhibitors were initially mixed at different levels, and then chloride ions were gradually added into the solution in several steps. The open-circuit potential (Ecorr) and corrosion current density (lcorr) determined by electrochemical impedance spectra (EIS) were used to identify the initiation of active corrosion, thereby determining the chloride threshold value. It was found that although all the inhibitors were effective in decreasing the corrosion rate of steel reinforcement, they had a marginal effect on increasing the chloride threshold value. 展开更多
关键词 steel corrosion chloride threshold value electrochemical impedance spectra eis corrosion inhibitor
下载PDF
Chemical composition and Mott-Schottky analysis of passive film formed on G3 alloy in bicarbonate/carbonate buffer solution 被引量:1
3
作者 Dangguo LI Darong CHEN Jiadao WANG Haosheng CHEN 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2010年第6期461-472,共12页
The chemical composition and semi-conductive properties of passive film on nickel- based alloy (G3 alloy) in bicarbonate/carbonate buffer solution were investigated by Auger electron spectroscopy (AES), X-ray phot... The chemical composition and semi-conductive properties of passive film on nickel- based alloy (G3 alloy) in bicarbonate/carbonate buffer solution were investigated by Auger electron spectroscopy (AES), X-ray photoelectron spectroscopy (XPS), elec- trochemical impedance spectra (EIS) and Mott-Schottky plot. AES and XPS results showed that the passive film appeared double-layer structure, in which the inner film was composed of nickel oxide, the mixed nickel-chromium-molybdenum-manganese oxides were the major component of the outer film. The electrochemical results revealed that the factors including frequency, potential, time, temperature and pH value can affect the semi-conductive property, the doping densities decreased with increasing potential and pH value, prolonging time and decreasing temperature. According to the above results, it can be concluded that the film protection on the substrate was enhanced with increasing potential and pH value, prolonging time and decreasing temperature. 展开更多
关键词 Nickel-based alloy Auger electron analysis (AES) X-ray photo- electron spectroscopy (XPS) Electrochemical impedance spectra eis Mott-Schottky plot
原文传递
Investigation on Electronic Property of Passive Film on Nickel in Bicarbonate/Carbonate Buffer Solution
4
作者 Li Dangguo Wang Jiadao Chen Haosheng Chen Darong 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2011年第2期243-253,共11页
The electronic properties of passive film formed on nickel in bicarbonate/carbonate buffer solution were studied by electrochemical impedance spectra (EIS) and Mott-Schottky plot. The film composition was analyzed b... The electronic properties of passive film formed on nickel in bicarbonate/carbonate buffer solution were studied by electrochemical impedance spectra (EIS) and Mott-Schottky plot. The film composition was analyzed by X-ray photoelectron spectroscopy (XPS). The results showed that passive film exhibited p-type semi-conductive character, and the acceptor density (NA) decreased with increasing potential, prolonging time, decreasing temperature, increasing pH value and decreasing chloride/sulfur ions concentration. The transfer resistance and film resistance increased with the above factors changing. XPS results showed that passive film was composed of NiO and a little amount of Ni2O3. 展开更多
关键词 NICKEL electrochemical impedance spectra eis X-ray photoelectron spectroscopy (XPS) passive films
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部