Papers by Keyword: Electrochemical Behaviour

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Authors: Ning Wang, Jing Wang, Fu Wei Zheng, Yu Min Wu, Bao Rong Hou
Abstract: This paper compares the microstructure and electrochemical properties of the diamond-like carbon films obtained by two different deposition methods - microwave electron cyclotron resonance plasma enhanced chemical vapor deposition (MWECR-PECVD) techniques and electro-deposition – chosen for their low cost and capacity to produce films. The microstructure of the DLC films are investigated by Raman spectroscopy, FTIR spectroscopy, and electrochemical behavior is investigated by potentiodynamic and electrochemical impedance spectroscopy (EIS). Raman spectroscopy indicates that all the films deposited by different techniques show amorphous structure and typical characteristic of DLC film. FTIR spectrum results indicate that these DLC films are a-C:H films. As a result of EIS, the DLC films made by different methods showed obviously different electrochemical characters. The obtained results show that the DLC films deposited using the PECVD methods provided the better results, presenting a high corrosion resistance , high adherence to substrate, and a denser and more uniform surface.
Authors: E.M. Arce Estrada, N.E. Torres-González, Victor M. López-Hirata
Authors: Manickam Minakshi, Pritam Singh, Melody Carter
Abstract: The redox behavior and surface characterization of manganese dioxide (MnO2) containing titanium boride (TiB2) as a cathode and Zn as an anode have been investigated in aqueous saturated lithium hydroxide (LiOH) electrolyte battery. The electrode reaction of MnO2 with TiB2 in this aqueous electrolyte is shown to be lithium insertion rather than the usual protonation. The influence of TiB2 additive (1, 3 and 5 wt. %) on the performance of MnO2 as a cathode and its cycling ability have been determined.
Authors: Zi Cheng Zhou, Sheng Tao Xing, Zi Chuan Ma, Yin Su Wu
Abstract: Nanostructured manganese oxides (Mn3O4, MnOOH) were successfully prepared by a hydrothermal method using MnCl2 as manganese source, NaOH as precipitation agent and H2O2 as oxidant. The composition and morphology of the products were determined by the dripping speed of NaOH solution, the adding order of reactant and the hydrothermal time. Single phase of Mn3O4 nanoparticles can be prepared by dropwise addition of the NaOH solution to the solution of MnCl2 and H2O2. While single phase of MnOOH nanorods can be obtained by pouring the NaOH solution into the reaction system quickly or changing the adding order of NaOH and H2O2. When the dripping speed of NaOH solution was 6mL/min, and an appropriate amount of surfactant (C18H29NaO3S) was added, Mn3O4 nanorods can be obtained. The hydrothermal method can be readily controlled to synthesize Mn3O4 and MnOOH with different morphologies. The Mn3O4 sample had higher capacitance than the MnOOH sample. The morphologies of these samples had little effect on their electrochemical performance.
Authors: Cai Xiang Gu, Xing Hua Du, Guan Jun Zhu, Yan Sheng Yin, Wen Ge Li
Abstract: Polarization curves, corrosion potential, scanning electron microscopy (SEM) were adopted to investigate the corrosion behaviors of QSn4-3 under two kinds of marine advantage bacteria (anaerobic SRB and facultative anaerobic Vibrio natriegens) environment. The results show that the microbial film has some effects on inhibiting corrosion of QSn4-3 at the early stage of corrosion; the existence of marine microorganisms accelerates the corrosion process of QSn4-3; the combined action of SRB and V.natriegens accelerates the corrosion obviously and QSn4-3 coupon is more prone to pitting corrosion.
Authors: J.-P. Millet, S. Chechirlian, X.Z. Chen, H. Mazille
Authors: Zhuo Qun Li, Da Yong Shan, Wei Ke, En Hou Han
Abstract: Microstructural examinations of T6-treated WE54 magnesium alloy were conducted after different aging conditions, and the influence of aging on electrochemical behavior of this alloy was investigated. For three batches of samples, with increasing aging time, the amount of precipitate phases was greatly promoted, and they formed in a strengthening continuous way. Electrochemical study showed that the value of corrosion potential followed the tendency to decrease when the aging condition transformed from under-aged to peak-aged. However, after peak-aging, the corrosion potential was raised to higher values. Explanations for the observed phenomena were based on the relationship between microstructure, especially precipitate phases, and electrochemical behavior. At under-aged condition, matrix served as galvanic cathode and precipitates acted as galvanic anode. Because the amount of precipitate would rise with prolonging aging time, it is natural that corrosion potential decreased. For over-aged alloys, metastable precipitate phases might in situ change to equilibrium phases, rendering increase of corrosion potential possible.
Authors: Ya Ni Zhang, Mao Sheng Zheng, Jie Wu Zhu
Abstract: The potentiodynamic polarization and cyclic voltommogroms studies were carried out on the copper with micro-addition of Cr and Zr in solutions of 0.5M NaCl, 0.5M NaOH and 0.5M HCl at room temperature. The corrosion resistance of pure copper is deteriorated with addition of the alloying elements Cr and Zr. Significant reducing in the corrosion resistance is observed when Cr and Zr are added simultaneously. Moreover, the lowest corrosion current density is obtained in the NaCl solution followed by the NaOH solution and HCl solution. Compared with the different effect on the passive layer in the NaCl solution, the micro-addition of Cr and Zr leads to the increasing of the corrosion resistance for the passive layer in 0.5M NaOH solution and 0.5M HCl solution.
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