Papers by Keyword: Electrode Potential

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Authors: Guang Fu Li, Guo Liang Zhang, Jian Jiang Zhou, Chun Bo Huang, Wu Yang
219
Authors: Ayodele Samuel Adeniyi, Mary Ajimegoh Awotunde
Abstract: The Tafel extrapolation and linear polarization methods were used as effective measures for determining the corrosion susceptibility of a spheroidized 0.35%C steel with sea water as the electrolyte. Eight pieces of steel were machined to length 5mm by 10mm in diameter. Two pieces each were heat treated at 600°C, 700°C and 800°C respectively and two pieces left as control. Electro-chemical experiments were carried out to obtain the best potential and anodic current of samples immersed in an electrolyte (seawater) at varying anodic potential of-0.7mv, -0.6mv, -0.5mv and-0.4mv respectively. The results showed that the sample with the least corrosion rate were the samples spheroidized at 700°C. They appeared to have the highest electrode potential value of-0.6mv and 800°C spheroidized samples had the least electrode potential value of-0.65mv at the end of 2000seconds respectively. From the results obtained, the samples spheroidized at 700°C appeared to be most suitable for seawater environment.
20
Authors: Lateef O. Mudashiru, Emmanuel O. Sangotayo, Samuel O. Alamu
Abstract: The present study investigated the effect of operating parameters in modeling the output quality of welding process of steel sample. A three factor, three levels Box-Behnken Design (BBD) of RSM was applied to determine the effects of three independent variables (welding speed (A), welding current (B) and electrode potential (C)) on the tensile strength and to also develop a model for predicting the output quality. Data analysis shows that A, C, AB, BC, A2, B2and C2 are the terms which significantly affected the ultimate tensile strength of the sample at 95% confidence level. The experimental values were very close to the predicted values and were not statistically different at p<0.05. The maximum tensile strength of 228 MPa was obtained at 250 A current, electrode diameter of 3.25 mm and 50 cm/min welding speed, respectively. The regression model obtained has provided a basis for selecting optimum process parameters for the improving output quality (tensile strength) of the welded steel sample.
12
Authors: Xi Qing Dong, Mei Rong Li, Yan Liang Huang, Li Juan Feng, Xin Cui
Abstract: Slow strain rate test (SSRT) applied with different potential was adopted to investigate the stress corrosion cracking (SCC) sensibility of stainless steel under marine environment. The fracture morphology of 321 stainless steel SCC specimens were analyzed with the aid of SEM. The strain-stress results showed that 321 stainless steel exhibited less SCC sensitivity when anodic potential or cathodic potential were applied on the specimen, both fracture elongation and fracture time ascended compared with that of corrosion potential. The fractography analysis results also proved this susceptibility clearly.
75
Authors: Kun Zhang, Yu Su Song, Yi Zhou
Abstract: The solid-state Ag / AgCl electrode was used to explore the ocean electric field. The effects of sintering technologies on the stability of electrode potential were researched. Four kinds of electrodes, which were respectively sintered to two temperatures of 380°C and 420°C by two heating methods of direct heating and phase-type heating methods, were prepared. Their surface morphologies, metallographic structures and the electrode potentials in 3.5% sodium chloride solution were analyzed to compare the stability of different sintering technologies. The results show that the electrodes sintered to 380°C by phase-type heating - insulation method have the best stability of potential, and potential difference of two electrodes is less than 0.02079mv/h.
1900
Authors: Guang Fu Li, Da Feng Yan
Abstract: The effects of soil type of Shanghai and electrode potential from cathodic protection point on near-neutral pH stress corrosion cracking (SCC) behavior of pipeline steel X60 has been investigated for structural integrity assessment. The SCC behavior was evaluated through slow strain rate tests (SSRT) at various electrode potentials in three solutions containing different typical soils. Results showed that the SCC susceptibility generally increased with decreasing electrode potential in all the three environments, with quick increase happening in the range from-1500 to-700mV(SCE). It is suggested that hydrogen induced cracking should dominate the SCC at low potentials. In cathodic potential range, the rank of the SCC susceptibility for soil type was Near-city soil > Cyan-purple soil > Cyan-yellow soil. In anodic potential range, SCC susceptibility curves mixed each other in the three solutions.
1116
Authors: Fu Li Wang, Jing Chao Chen, Jie Yu
Abstract: Four kinds of fermi energy of lead anode plate were calculated by using first-principles. Different metals and different alloy elements of the fermi energy level were compared, the minimum electrode potential lead base alloy anode materials is known. The results calculations show that the adding alloy elements can reduce the electrode potential of the lead anode plate, four kinds of alloy systems Pb-Ag, Pb-Sb, Pb-Sr, Pb-Sn were calculated, the highest of fermi energy was Pb-Sb alloy. So the Pb-Sb alloy is expected to become the electrode potential minimum lead base alloy anode materials.
1817
Authors: Oksana N. Zarubina, Gennady M. Mokrousov, Liubov V. Maliy
Abstract: The thermodynamically possible reactions in MnTe-H2O system at room temperature have been studied. The potential–pH diagram has been plotted assuming quasi-equilibrium on interfacial boundary. The possible mechanism of formation and the composition of a surface in dependence on electrode potential and pH have been discussed and the stable conditions for manganese telluride, i.e. the specific area in the diagram (pH from −2 to 14 and potential from −1.5…− 1.1 to −0.9…−0.6 V) have been found. The obtained results may help optimize the conditions for electodeposition of manganese telluride thin films and for liquid chemical etching for the formation of interfacial boundaries.
113
Authors: Guang Fu Li, Chun Bo Huang, Hao Guo, Wu Yang
Abstract: Stress corrosion cracking (SCC) behaviors of pipeline steel X70 in various near-neutral pH soil environments with characteristics of eastern China have been studied through electrochemical measurements and slow strain rate tests (SSRT) at various electrode potentials in four solutions containing different typical soils in eastern China as well as in NS-4 solution. The SCC susceptibility in the four soil solutions was generally higher than that in NS-4 solution. There was a general trend that SCC susceptibility increased with decreasing the potential, suggesting that hydrogen induced cracking probably plays a key role in the cracking at least at low potentials and the parameters of cathodic protection in engineering should be carefully optimized to avoid SCC.
223
Authors: Lan Zhou, Xiao Yun Liu, Jian Zhong Shao, Ya Ni Chen
Abstract: In this paper, potential analysis method was applied to study the effects of pH value and temperature on potential and reducing capacity of thiourea dioxide, and the reactivity between thiourea dioxide and reactive dyes as ground shade dyes under simulated printing steaming conditions in aqueous solution was also investigated. The results showed that thiourea dioxide’s reduction potential increased with the rise of pH value and temperature. when temperature was lower than 60 °C, thiourea dioxide had low reactivity with reactive dyes as ground shade dyes, and when temperature was up to 80 °C, thiourea dioxide began to break reactive dyes, which was in accordance with the reduction potential change rule of thiourea dioxide along with temperature.
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