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Effect of electrolyte temperature on the nano-carbonitride layer fabricated by surface nanocrystallization and plasma treatment on a γ-TiAl alloy

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Rare Metals 2009年第5期28卷 454-459页

作者： M. Aliofkhazraei A. Sabour Rouhaghdam H. Hassannejad Department of Materials Engineering Faculty of Engineering Tarbiat Modares University

The distribution of nano-carbonitrides produced by the treatments of surface nanocrystallization and plasma electrolytic carbonitriding on a γ-TiAl was investigated by means of figure analysis. The skewness and kurtosis of Gaussian shape distribution curves were studied and the effect of electrolyte temperature was determined. The usage of lower temperatures of the electrolyte is more suitable for achieving lower sizes of complex nano-carbonitrides. The surface roughness of treated samples was measured and it was observed that there is an optimum level of electrolyte temperature for surface roughness increase （difference between two measured data）.

关键词： carbonitride electrolyte temperature nanostructures plasma electrolytic deposition roughness γ-TiAl

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electrolyte temperature Based Control Method for Aluminum Fluoride Addition in Hall-Héroult Cell

Electrolyte Temperature Based Control Method for Aluminum Fl...

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第二十七届中国控制会议

作者： Huang Yongbo1,2,Zhou Jiemin 1,Qu Xiangdong 2,Sun Zhiqiang 1 1.School of Energy Science and Engineering,Central South University,Changsha 410083,P.R.China 2.Aluminum Electrolysis Plant,Guangxi Branch of CHALCO,Baise 531400,P.R.China

Addition of aluminum fluoride is an important parameter adopted to control electrolyte temperatures in Hall-Héroult ***,determination of the optimal addition is still a difficult *** paper puts forward a new control method to select the present-day aluminum fluoride addition optimally based on the yesterday electrolyte *** were carried out on two industrial cells with the same cell age.A proposed prediction correlation for the aluminum fluoride addition was derived from the regression analysis of the test *** results show that the cell performance is fairly stable through adopting the predicted aluminum fluoride addition in comparison with the existing control *** view of its simplicity and practicability,this prediction method for aluminum fluoride addition is acceptable in the industrial field.

关键词： Aluminum reduction Hall-héroult cell Aluminum fluoride Addition control electrolyte temperature

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Discharge Characteristic of Micro-Arc Oxidation on Aluminum Alloy under the Changing electrolyte temperature

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Journal of Materials Science and Chemical Engineering 2022年第11期10卷 24-35页

作者： Hongwei Yang Xin Wang Zongtao Zhu Ruilin Liu CRRC Nanjing Puzhen Co. Ltd. Nanjing China School of Materials Science & Engineering Southwest Jiaotong University Chengdu China

The electrolyte temperature has a great influence on the performance of the coating prepared by micro-arc oxidation (MAO). The behavior of MAO discharge in the changing electrolyte temperature has been investigated. Compared to constant electrolyte temperature in conventional MAO process, the process has different discharge characteristics under the changing electrolyte temperature. The amplitude of pulse voltage was detected to study the change of discharge characteristic under the constant-current control of MAO power supply. Three successive discharge stages were differentiated by the variable the pulse voltage versus process time. Since there were significant changes in the sound, the sound signals were acquired and the audio analysis was used to describe the changing of the MAO discharge at different stages. Optical emission spectroscopy (OES) was employed in situ to unveil how the micro-discharge changed with the temperature increasing. Scanning electron microscopy (SEM) was used to characterize the morphology of the coatings on 6N01 aluminum alloy prepared by normal process with the constant-temperature control of the MAO electrolyte and by the process under the changing electrolyte temperature. A mode of film growth and micro-discharge was given to describe the effects of the changing electrolyte temperature in the whole MAO process.

关键词： Micro-arc Oxidation Aluminum Alloy Discharge Characteristics electrolyte temperature

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