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101.
目的 探究镍基合金925和抗硫油管管材110SS在不同面积比下耦接后的电偶腐蚀行为和电偶腐蚀效应,模拟国内某油气田高温高酸性腐蚀环境。方法 采用浸泡腐蚀试验和电化学测试技术,评价电偶腐蚀的阴阳极过程对腐蚀进程的影响,并利用扫描电子显微镜(SEM)、X射线能谱仪(EDS)与X射线衍射仪(XRD)对腐蚀试样的表面形貌及腐蚀产物成分进行分析。结果 110SS的自腐蚀电位远远低于925,阴阳极分别以1:1、1:5、1:10、1:30四种面积比耦接后,均发生电偶腐蚀。耦接后110SS的腐蚀速率分别为:0.7564、0.7032、0.6457、0.6289 mm/a,均为极严重腐蚀。结论 电偶腐蚀速率和电偶腐蚀效应均随着阴阳极面积比的增大而增加。镍基合金与碳钢油管耦接主要对材料在腐蚀环境下的腐蚀进程有影响,而对腐蚀产物和腐蚀机理的影响不大。 相似文献
102.
In this study, sulfuric acid and potassium hydroxide are used as the electrolytes, separated by proton exchange membrane, to produce hydrogen. The effects of electrolyte concentrations, applied voltage, single or dual cells, and temperature on the hydrogen production rate and energy efficiency are investigated. Experimental results show that the amount of hydrogen production increases with voltage, and the dual electrolytes and cells can yield the best hydrogen production rate and energy efficiency. With 1-M KOH plus 1-M H2SO4 as electrolytes in separated cells, the highest hydrogen production rate is about 0.95 L/hr. Results also show that the rise of electrolyte temperature can significantly increase the hydrogen production rate up to 50%, and the energy efficiency up to 20%. Keeping a low PH value in cathodeand high anode PH value in anode indeed enhances the efficiency of hydrogen production rate. 相似文献
103.
Complex organics contained in dye wastewater are difficult to degrade and often require electrochemical advanced oxidation processes (EAOPs) to treat it. Surface activation of the electrode used in such treatment is an important factor determining the success of the process. The performance of boron-doped nanocrystalline diamond (BD-NCD) film electrode for decolorization of Acid Yellow (AY-36) azo dye with respect to the surface activation by electrochemical polarization was studied. Anodic polarization found to be more suitable as electrode pretreatment compared to cathodic one. After anodic polarization, the originally H-terminated surface of BD-NCD was changed into O-terminated, making it more hydrophilic. Due to the oxidation of surface functional groups and some portion of sp2 carbon in the BD-NCD film during anodic polarization, the electrode was successfully being activated showing lower background current, wider potential window and considerably less surface activity compared to the non-polarized one. Consequently, electrooxidation (EO) capability of the anodically-polarized BD-NCD to degrade AY-36 dye was significantly enhanced, capable of nearly total decolorization and chemical oxygen demand (COD) removal even after several times of re-using. The BD-NCD film electrode favored acidic condition for the dye degradation; and the presence of chloride ion in the solution was found to be more advantageous than sulfate active species. 相似文献
104.
目的研究浸泡时间对两种涂层电化学腐蚀行为的影响。方法在质量分数为3.5%的Na Cl溶液中通入饱和CO_2气体,采用电化学方法、SEM形貌检测方法测量两种涂层在该溶液中不同浸泡时间下的动电位扫描极化曲线和表面形貌,对比分析两种涂层的电化学特征和防蚀性能。结果随着涂层浸泡时间的延长,自腐蚀电位E_(corr)逐渐降低,而电流密度逐渐增大;在浸泡时间相同的情况下,涂层A的自腐蚀电位E_(corr)比涂层B高,而电流密度比涂层B低,说明涂层A的耐蚀性能明显优于涂层B。结论涂层短时间浸泡(≤72 h)时,电化学阻抗谱为吸氧过程的单容抗弧,长时间浸泡(≥120 h)时则为析氢过程的2个容抗弧,其耐蚀性下降。 相似文献
105.
In this work a two-stage process combining soil electrokinetic remediation and liquid electrochemical oxidation for the remediation
of polluted soil with organic compounds has been developed and evaluated using phenanthrene-spiked kaolinite. Application
of an unenhanced electrokinetic process resulted in negligible removal of phenanthrene from the kaolinite sample. Addition
of co-solvents and electrolyte to the processing fluid used in the electrode chambers enhanced phenanthrene desorption from
the kaolinite matrix and favoured electro-osmotic flow. Near-complete removal of phenanthrene was achieved using Na2SO4 and ethanol in the processing fluid. Phenanthrene was transported towards the cathode chamber where it was collected. The
cathodic solution containing the pollutant was treated by electrochemical oxidation; complete degradation of phenanthrene
occurred after 9 h using Na2SO4 as electrolyte. 相似文献
106.
Fuqiang Liu Shengtao Jiang Shijie You Yanbiao Liu 《Frontiers of Environmental Science & Engineering》2023,17(2):18
107.
Yamina Mounia Azri Insaf Tou Meriem Sadi Lamia Benhabyles 《International Journal of Green Energy》2018,15(4):254-263
In the present study, bioelectricity generation using a living plant in soil was achieved by converting solar energy into electricity on the principles of plant photosynthesis. The plants Chlorophytum comosum, Chasmanthe floribunda and Papyrus diffuses were used in microbial fuel cells (MFCs) and produced, respectively, a maximum current of 25, 31 and 19 mA/m2, without the use of any nutrient or membrane. In this study, the importance of light was demonstrated by the high current values generated during daytime, and the microorganisms at the anode-rhizosphere interface were examined. 相似文献
108.
ABSTRACTOur understanding of the determinants of public concern about climate change relies heavily on survey research in the United States. But can those findings be generalized to the rest of the world? Analysis of the Pew Research Center’s 2015 Global Attitudes Survey shows fairly similar patterns in the English-speaking Western democracies and, to a lesser extent, western Europe, but party identification and political ideology matter much less in most of the globe, and demographic factors have very different impacts. Female, younger, and less religious people tend to worry more about climate change in English-speaking Western democracies. In most of the world, however, concern is only weakly correlated with gender, rises with age and religiosity, and is more strongly correlated with education. A new measure of commitment to democratic values proved to be the most consistent predictor of concern globally. 相似文献
109.
110.
Alves SA Ferreira TC Sabatini NS Trientini AC Migliorini FL Baldan MR Ferreira NG Lanza MR 《Chemosphere》2012,88(2):155-160
The thiadiazolylurea derivative tebuthiuron (TBH) is commonly used as an herbicide even though it is highly toxic to humans. While various processes have been proposed for the removal of organic contaminants of this type from wastewater, electrochemical degradation has shown particular promise. The aim of the present study was to investigate the electrochemical degradation of TBH using anodes comprising boron-doped (5000 and 30 000 ppm) diamond (BDD) films deposited onto Ti substrates operated at current densities in the range 10-200 mA cm−2. Both anodes removed TBH following a similar pseudo first-order reaction kinetics with kapp close to 3.2 × 10−2 min−1. The maximum mineralization efficiency obtained was 80%. High-pressure liquid chromatography with UV-VIS detection established that both anodes degraded TBH via similar intermediates. Ion chromatography revealed that increasing concentrations of nitrate ions (up to 0.9 ppm) were formed with increasing current density, while the formation of nitrite ions was observed with both anodes at current densities ?150 mA cm−2. The BDD film prepared at the lower doping level (5000 ppm) was more efficient in degrading TBH than its more highly doped counterpart. This unexpected finding may be explained in terms of the quantity of impurities incorporated into the diamond lattice during chemical vapor deposition. 相似文献