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Inhibition roles of molybdate and borate on Q235 steel corrosion in resistance reducing agent

Journal of Iron and Steel Research International 2023年第8期30卷 1477-1489页

作者： Yang Yang Hui Su Lan-lan Liu Song Xu Zhen Zhong Xiao-bao Zhou Tang-qing Wu School of Materials Science and Engineering Xiangtan UniversityXiangtan 411105HunanChina State Grid Hunan Electric Power Company Limited Transmission Maintenance Changsha 410100HunanChina State Grid Hunan Electric Power Company Limited Research Institute Changsha 410007HunanChina

The effects of Na_(2)MoO_(4) and Na_(2)B_(4)O_(7) on corrosion behavior of Q235 steel in resistance reducing agent(RRA)containing sodium bentonite were studied by mass loss,scanning electron microscopy and electrochemical *** results showed that both the independent and mixed additions of Na_(2)MoO_(4) and/or Na_(2)B_(4)O_(7),can reduce the corrosion rate of Q235 steel in RRA containing sodium *** the inhibition effect of Na_(2)MoO_(4) and/or Na_(2)B_(4)O_(7)increased with their dosage *** the same dosage,the inhibition efficiency of the mixed addition of Na_(2)MoO_(4) and Na_(2)B_(4)O_(7),was higher than that of their independent *** passivation effect of Q235 steel was easy to obtain in the RRA with the mixed addition of Na_(2)MoO_(4) and Na_(2)B_(4)O_(7).The optimized inhibitor for the RRA containing sodium bentonite was the mixture of Na_(2)B_(4)O_(7) and Na_(2)MoO_(4) with a total concentration of 1.5 wt.%.Furthermore,the increase in corrosion potential E_(corr) and the decrease in corrosion current density i_(cor) in carbon steel were one of the important criteria for the formation of passivation film.

关键词： Q235 steel Resistance reducing agent Corrosion inhibitor Sodium bentonite electrochemical impedance spectrum

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electrochemical impedance Spectroscopy Study on Novel Carbon-Sulfur Nano-Composite Cathodes in Lithium Rechargeable Batteries

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Journal of Rare Earths 2004年第S1期22卷 89-94页

作者：郑伟胡信国张翠芬 Department of Applied Chemistry Harbin Institute of Technology Harbin 150001 China Jiangmen JJJ Battery Co. Ltd. Jiangmen 529000 China

Carbon-sulfur nano-composite cathodes for lithium rechargeable batteries were investigated by electrochemical impedance spectroscopy (EIS). The novel carbon-sulfur nano-composite material was synthesized by heating sublimed sulfur and high surface area activated carbon (HSAAC) in certain conditions. Equivalent circuits were used to fit the spectra at different discharge states. The variations of impedance spectra, charge-transfer resistance and double layer capacitance were discussed. The changes of EIS with potential were analyzed based on a plausible electrical equivalent circuit model, and some parameters were measured and analyzed about electrochemical performance and state of charge and discharge of the electrode. The good accuracy in fitting values of the model to the experimental data indicates that the mathematical model gives out a satisfying description upon the mechanism of high rate of capacity fade in lithium-sulfur battery.

关键词： high surface area activated carbon sublimed sulfur electrochemical impedance spectrum equivalent circuit lithium rechargeable batteries rare earths

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Effects of complexing agents on acidic electroless nickel deposition

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Rare Metals 2010年第4期29卷 401-406页

作者： JIN Ying YU Hongying YANG Dejun SUN Dongbai National Center for Materials Service Safety University of Science and Technology Beijing Beijing 100083 China Corrosion andProteetion Center School of Materials Science andEngineering University of Science and Technology Beijing Beij'ing 100083 China

Our previous study reported the influences of different complexing agents on electroless nickel （EN） by examining the properties of the deposits. In the present work, the effects of four common-used complexing agents on EN deposition rate and the stability of solution pH values were examined, either with an acetic pH buffer agent or absent of them. It is indicated that the pH buffeting effect of them is dominative when the EN solution is lack of the pH buffer. Under this situation, the EN deposition rate increases with the concentration of complexing agents increasing. The EN deposition rate decreases with fin＇ther adding the complexing agent when the solution already has enough pH buffer capability. electrochemical impedance spectroscopy obtained during EN deposition illustrates that, in this case, the enhanced reaction resistance is the main reason for a lower deposition rate. However, the influence of polarization caused by mass transfer is not negligible at high complex ratio for sodium citrate and malic acid EN solutions.

关键词： electroless nickel complexing agents electrochemical impedance spectrum reaction resistance pH value

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Coulometric Response of H-Selective Solid-Contact Ion-Selective Electrodes and Its Application in Flexible Sensors+

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Chinese Journal of Chemistry 2023年第2期41卷 207-213页

作者： Tingting Han Tao Song Shiyu Gan Dongxue Han Johan Bobacka Li Niu Ari lvaska Guangzhou Key Laboratory of Sensing Materials&Devices Center for Advanced Analytical ScienceSchool of Chemistry and Chemical Engineeringc/o School of Civil EngineeringGuangzhou UniversityGuangzhouGuangdong 510006China State Key Laboratory of Pulp and Paper Engineering South China University of TechnologyGuangzhouGuangdong 510640China Guangdong Provincial Key Laboratory of Psychoactive Substances Monitoring and Safety Anti-Drug Technology Center of Guangdong ProvinceGuangzhouGuangdong 510230China Abo Akademi University Johan Gadolin Process Chemistry CentreLaboratory of Molecular Science and EngineeringHenriksgatan 2Fl-20500Turku/AboFinland

The analytical performance of H+-selective solid-contact ion-selective electrodes(SCISEs)based on solid contact polyaniline doped with chloride(PANI(Cl))and poly(3,4-ethylenedioxythiophene)doped with poly(styrene sulfonate)(PEDOT(PSS))was characterized by a developed coulometric signal transduction ***(PSS)solid contact is covered by PVC based H+-selective *** obtained coulometric signal demonstrates that the cumulated charge can be amplified by increasing the capacitance of solid *** covered with spin-coated membrane behave faster amperometric response than electrodes with drop-cast *** contrast to earlier works,the amperometric response and impedance spectrum demonstrates H+transfer through SCISEs is independent from the thickness of *** exceptional behavior of PANI(Cl)H+-SCISEs shows that the capacitance estimated from impedance spectrum at low frequency 10 mHz and coulometric signal of PANI(Cl)based SCISEs is influenced by the applied po-tentials,whereas PEDOT(PSS)solid contact is independent from the chosen applied ***,preliminary investiga-tions of coulometric signal transduction on flexible pH sensor implies its potential applications in wearable sensors for sweat ion concentration detection.

关键词： Solid-contact ion-selective electrodes Membranes Proton transfer Conducting materials Cyclic voltammetry Coulometric response Flexible sensors electrochemical impedance spectrum

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electrochemical Corrosion Study in H₂SO₄ of NiAl with Cu Additions, Microstructure and Micro-Hardness at Room Temperature

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Journal of Minerals and Materials Characterization and Engineering 2022年第3期10卷 225-241页

作者： Jesús M. Colín de la Cruz Sergio A. Serna Barquera Alvaro Torres-Islas Arturo Molina-Ocampo Edgar Valenzuela José G. González Rodríguez Universidad Autónoma del Estado de Morelos Facultad de Ciencias Químicas e Ingeniería UAEM-FCQeI. Av. Universidad 1001Colonia Chamilpa Cuernavaca Morelos México Universidad Autónoma del Estado de Morelos Centro de Investigación en Ingeniería y Ciencias Aplicadas UAEM-CIICAp Cuernavaca Morelos México UABC Baja California Sur México

For many years, intermetallic materials promise applications in a wide variety of technology areas. NiAl intermetallic compound is material that exhibits important characteristics such as high corrosion resistance and low density besides its ability to retain strength and stiffness at elevated temperatures. However NiAl intermetallic is too hard, brittle and exhibits very low ductility at room temperature being the reason because this material is not yet available for structural applications. In order to increase the ductility of the NiAl intermetallic compound, the addition of a third alloying element has been proved, nevertheless it is important to determine if such additions decrease or increase the hardness and the corrosion resistance of the alloy. So, the present investigation reports the corrosion performance of the NiAl intermetallic compound modified with Cu, emphasizing the EIS analysis and the relation between physical parameters and the modelling equations used in the Equivalent Electric Circuit. It was found that the addition of Cu promotes the formation of the γ’-Ni3Al phase in Cu contents greater than 15 at. %, in addition to a decrease in micro hardness and an increment in the Icorr values. In this way, the electrochemical characterization evidenced a high corrosion resistance of these intermetallic alloys.

关键词： NiAl-Cu Corrosion Behavior electrochemical impedance spectrum Vickers Micro Hardness Microstructure

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