【Table of this issue·Abstract】
Surface Technology
DOI:
10.19289/j.1004-227x.2020.15.001
Titanium alloy substrate surface roughness on the performance of Ti/TiN/Zr/ZrN multilayer film
Lu Liang, Lin Songsheng, Wang Di, Liu Lingyun, Wang Wei, Guo Chaoqian, Dai Mingjiang, Wang Yuncheng (China Aviation Development Southern Industrial Co., Ltd.; Guangdong Academy of Sciences, Guangdong Institute of New Materials, National Engineering Laboratory of Modern Materials Surface Engineering Technology, Guangdong Key Laboratory of Modern Materials Technology)
Abstract: In order to improve the erosion resistance of titanium alloy, vacuum cathode arc ion plating technology was used to prepare Ti/TiN/Zr/ZrN multi-layer films on the surface of TC4 titanium alloy with different surface roughness (Ra). The cross-sectional morphology, microstructure, thickness, microhardness, bonding force and sand erosion resistance of the multilayer film were analyzed by scanning electron microscope (SEM), X-ray diffractometer (XRD), microhardness, scratching instruments. The influence of substrate surface roughness on the binding force and anti-sand particle erosion performance of multilayer films was studied. The results show that the obtained Ti/TiN/Zr/ZrN multilayer film thickness is about 12 μm and the microhardness is greater than 3 000 HV, which can significantly improve the anti-sand particle erosion performance of the TC4 titanium alloy substrate. Under the same process conditions, the smaller the surface roughness of the substrate, the better the binding force and anti-sand particle erosion performance of its surface film layer. In order to obtain a Ti/TiN/Zr/ZrN multilayer film with good comprehensive performance, the surface roughness of the TC4 titanium alloy matrix must be controlled at ≤1.60 μm.
Keywords: titanium; zirconium; nitride; multi-layer film; arc ion plating; surface roughness; anti-sand grit erosion performance
Fund project: Guangdong Special Branch Planning Team Project (2019BT02C629); Guangdong Academy of Sciences Science and Technology Improvement Project (2018GDASCX-0402).
DOI:
10.19289/j.1004-227x.2020.15.002
lateral downstream local electrodeposition study
Kanbiao, Xu Shengsong, Yang Yumeng, Wang Zhentian, Ding Jianning (College of Mechanical Engineering, Changzhou University; Research Center for Low-dimensional Material Micro-nano Devices and Systems of Changzhou University; Research Institute of Intelligent Flexible Mechanical Electronics, Jiangsu University)
Abstract: established a lateral downflow local electrodeposition (LECD) simulation model, and conducted numerical simulation of the migration of copper ions and the formation of deposition morphology during the electrodeposition process. It was found that the central peak formed in the center of the basin in the early stage of the deposition reaction, and then the asymmetry of the deposition morphology increased, and a pre-peak gradually formed on the central peak near the upstream side. The ion concentration distribution results show that the central peak is mainly formed by the deposition of copper ions below the anode, while the pre-peak is formed by the deposition of copper ions brought by the lateral flow. In addition, increasing the flow rate of the lateral flow will accelerate the formation of the pre-peak and move its position downstream. Increasing the voltage between the cathode and anode will cause the pre-peak to be closer to the upstream, causing asymmetric deposition to occur in advance. Increasing the distance between the cathode and anode will significantly increase the deposition thickness in the model area, the pre-peak position is closer to the downstream, and delay the occurrence of asymmetric deposition. The use of lateral flow assisted LECD is expected to provide a new method for the preparation of special-shaped micromorphology and microstructure.
Keywords: microstructure; local electrodeposition; lateral flow; asymmetry; numerical simulation
Fund project: National Natural Science Foundation (51105046, 91648109); Jiangsu Province Postgraduate Research Innovation Program Project (KYCX17_2087).
DOI:
10.19289/j.1004-227x.2020.15.003
Hydrogen content control of Kva alloy shell with tungsten copper alloy heat dissipation base
Dong Yiming, Shen Zhongke, Ao Dongfei, Liu Sidong, Xie Xingen (Nanjing Electronic Devices Research Institute)
Abstract: A study on hydrogen content control of Kva metal shell using tungsten copper alloy as the base. The hydrogen content of the finished product can be controlled within 0.2% by baking at 350 °C × 48 h before plating and 250 °C × 48 h after plating.
keywords: tungsten copper alloy base; cova alloy; encapsulation shell; electroplating; nickel; gold; baking; hydrogen content
DOI:
10.19289/j.1004-227x.2020.15.004
Effect of silane treatment on the binding force of hot-dip galvanized steel surface
Wang Jinrong, Liu Guiqi, Lu Zhiqiang, Wu Lei, Wang Hailong, Chen Zhuo (Hebei Iron and Steel Group Tangshan Iron and Steel Co., Ltd.)
Abstract: uses light oiling, heavy oiling and chromium-free passivated hot-dip galvanized steel plates as substrates. After silane treatment, polyester flat-light plastic powder is electrostatically sprayed, and the final specimen is obtained after baking. The effect of silane treatment on coating binding force was studied through grid method, fork + neutral salt spray test and high-pressure boiling test. The results show that silane treatment and chromium-free passivation can improve the binding force of the coating, and different hot-dip galvanized plates can be selected according to different usage conditions.
Keywords: hot-dip galvanized steel; silane; chromium-free passivation; electrostatic spraying; polyester powder coating; binding force; corrosion resistance
10.19289/j.1004-227x.2020.15.005
Cause analysis of the black spot failure of cadmium-plated passivation nut on a certain type of aircraft pipeline
Ding Yahong, He Jun, Tan Yao, Zhu Kai, Du Juan, Tang Lihua (Aviation Industry Chengdu Aircraft Industry (Group) Co., Ltd.)
Abstract: A certain cadmium-plated passivation nut is assembled in the pipeline for aircraft pneumatic systems and used 3 After months, black spots and white marks appeared on the surface. By analyzing the appearance, microscopic morphology and elemental composition of the faulty parts, it can be seen that the fault is mainly caused by corrosion of alkaline soap liquid for airtightness detection. Prevention and resolution measures were given.
keywords: nut; cadmium plating; passivation; black spot defects; soap liquid; corrosion; troubleshooting
DOI:
10.19289/j.1004-227x.2020.15.006
45 Film formation mechanism of carboxylic acid gas-phase corrosion inhibitors on steel surface
Li Hongyang, Lu Lixin, Li Weizhe, Jiang Zhe (School of Mechanical Engineering, Jiangnan University; National Light Industry Packaging Products Quality Supervision and Inspection Center; Shenyang Anti-rust Packaging Materials Co., Ltd.)
Abstract: uses infrared spectroscopy, X-ray photoelectron energy spectroscopy and atomic force microscopy to study the film formation mechanism of benzoic acid and C8-10 acid on the surface of 45 steel. The results show that these two gas-phase corrosion inhibitors are film-forming corrosion inhibitors, and it is speculated that benzoic acid molecules form films through double-tooth coordination on the surface of 45 steel, while C8-10 acid molecules form films through bridge coordination on the surface of 45 steel. In the corrosion inhibitor molecule-coordinated Fe3+ is bound. The presence of two gas-phase corrosion inhibitor self-assembled films has greatly changed the surface morphology of 45 steel and is different.
Keywords: medium carbon steel; gas-phase corrosion inhibitor; carboxylic acid; self-assembly; morphology; surface roughness; coordination; film formation mechanism
Application electrochemistry
DOI:
10.19289/j.1004-227x.2020.15.007
FTO Preparation of ZnO on the surface of thin films Nanostructure
Li Shuangshuang, Wang Yilun, Li Baojia (Changzhou Engineering Vocational and Technical College; Jiangsu University School of Mechanical Engineering; Jiangsu University School of Materials Science and Engineering)
Abstract: uses magnetron sputtering to deposit a metal Zn layer on the surface of the FTO (fluoro-doped tin dioxide) glass substrate, and then place it in hydrogen peroxide solution, and irradiate its surface by nanosecond pulse laser to achieve the preparation of ZnO nanostructures. The influence of laser energy density and scanning rate on the formation of ZnO nanostructures and the surface morphology and photoelectric properties of the obtained ZnO nanostructure composite FTO (ZnO/FTO) film were studied. The results show that when the Zn layer thickness is 200 nm, it is possible to ensure that both a complete ZnO nanostructure appears on the surface of the FTO film, and only a small amount of Zn remains. When the laser energy density is 0.80 J/cm2 and the scanning rate is 15 mm/s, the ZnO nanostructure with the best uniformity and consistency is prepared on the surface of the FTO film. At this time, the ZnO/FTO film has the best photoelectric properties. Its average light transmittance in the 400 ~ 800 nm band is 70.18%, an average reflectance is 7.10%, and a block resistance is 9.23 Ω.
Keywords: fluorine-doped tin dioxide film; zinc; magnetron sputtering; hydrogen peroxide; laser irradiation; zinc oxide nanostructure; light transmittance; reflectivity
Fund project: Changzhou Engineering Vocational and Technical College Scientific Research Fund Project (11130300118025).
DOI:
10.19289/j.1004-227x.2020.15.008
Preparation of cobalt copper cyanide heterogeneous catalyst and its application in photoelectric Fenton degradation of levofloxacin
Lu Xiaoyuan, Jiang Chuanyang, Li Mingxuan, Chen Changjin, Zhan Boxiang, Feng Rui (School of Chemistry and Chemical Engineering, Hefei University of Technology, Anhui Key Laboratory of Controlled Chemistry and Materials Chemical, Anhui Hefei 230009)
Abstract: was electrolyzed on ITO conductive glass with aminoglycopper cyanide (Cu3[Co(CN)6]2, denoted as CuHCC) by cyclic voltammetry, and obtained the multifunctional heterogeneous catalytic electrode CuHCC/GNs/ITO, and was characterized by X-ray diffraction and scanning electron microscopy. The change in the concentration of hydroxyl radicals generated under different constant potentials (−0.4, −0.6 and −0.8 V relative to saturated calomel electrode) using CuHCC/GNs as the photoelectric Fenton catalyst was studied. Finally, 10 mg/L levofloxacin (LEVO) was degraded in 0.1 mol/L Na2HPO4 medium at pH 7.0 under −0.8 V and 300 W visible light irradiation, and the degradation rate of LEVO was as high as 91% through UV-visible spectrograms.
Keywords: heterogeneous catalyst; aminoglycoated graphene; cobalt copper cyanide; electrodeposition; levofloxacin; degradation; photoelectric Fenton reaction
Fund project: National Natural Science Foundation (U1407110).
DOI:
10.19289/j.1004-227x.2020.15.009
Cu2O/TiO2 electrode preparation and its application in monitoring of permanganate index
Peng Ying, Guo Yinying, Li Shuhong, Feng Hanyu, Qiu Huidong (School of Chemistry and Chemical Engineering, Chongqing University of Science and Technology; Shanghai University of Engineering and Technology)
Abstract: uses high-purity titanium sheet as the matrix, and first prepares TiO2 electrodes by anodizing method, and then obtains Cu2O/TiO2 electrode doped with Cu2O through pulse electrodeposition. The structure and redox capabilities of TiO2 electrodes and Cu2O/TiO2 electrodes were compared with X-ray diffractometer (XRD), scanning electron microscope (SEM) and cyclic voltammetry (CV) curve tests, and the feasibility of Cu2O/TiO2 electrodes in the determination of permanganate index was focused on studying the feasibility of Cu2O/TiO2 electrodes in the determination of permanganate index. The results show that Cu2O/TiO2 electrode has a strong redox reaction capability and is more suitable for the determination of permanganate index by photoelectrocatalytic method.
Keywords: titanium dioxide; anodization; cuprous oxide; electrode; electrode; photoelectric catalysis; permanganate index; determination of
Environmental protection technology
DOI:
10.19289/j.1004-227x.2020.15.010
porous phenolic resin microspheres to adsorption properties of divalent copper ions in wastewater
Zhang Mushi (Fujian Shipment and Transportation Vocational College, Fujian Fuzhou 350001)
Abstract: uses phenol and formaldehyde as monomers, polyvinyl alcohol as dispersants, and octadecanol and other pore-generating agents. Under NaOH catalytic conditions, porous phenolic (PF) resin microspheres were prepared by aqueous phase suspension polycondensation method, and the adsorption performance of this resin on Cu(II) in simulated wastewater was studied. The results show that when the PF resin microspheres are 0.1 g, the initial mass concentration of Cu(II) is 200 mg/L, pH = 6, and the adsorption time is 240 min, the removal rate of Cu(II) is 90.67%, and the maximum adsorption amount is 36.27 mg/g. The adsorption process is in line with the quasi-secondary kinetic model, and the Langmuir equation can be used to describe the process of adsorption of Cu(II) by PF resin microspheres.
keywords: phenolic resin; porous microspheres; suspension polycondensation; divalent copper ions; wastewater treatment; adsorption; kinetics
DOI:
10.19289/j.1004-227x.2020.15.011
Chitosan activated sludge composite adsorbent treatment of copper and chromium-containing wastewater
Zhao Zuoping, Qu Kaijing, Li Chen, Wu Rui, Song Fengmin, Liu Jin, Xu Haopu (School of Chemistry and Environmental Sciences, Shaanxi University of Science and Technology; Qinba State Key Laboratory of Biological Resources and Ecological Environment (National Pei))
Abstract: conducted a preliminary study on the effect of treating copper or hexavalent chromium wastewater with chitosan activated sludge composite adsorbent (SCTS). The effects of adsorbent dosage, pH, stirring speed and initial mass concentration of heavy metals on the adsorption performance of SCTS were studied through single-factor experiments. The primary order and optimal combination level of influencing factors were determined by orthogonal experiments. The results show that the main factors affecting the adsorption of Cu2+ wastewater in SCTS are the SCTS dosage amount Cu2+ initial mass concentration pH stirring speed. Under the conditions of Cu2+ initial mass concentration 80 mg/L, pH = 3, SCTS dosage amount 7.5 g/L, and stirring speed 110 r/min, the removal rate of Cu2+ can reach 92.7%; the main factors affecting the adsorption of Cr(VI) wastewater in SCTS dosage amount pH Cr(VI) initial mass concentration. Under the conditions of the initial mass concentration of Cr(VI) 100 mg/L, pH = 2, SCTS dosage amount 7.5 g/L, and stirring speed 130 r/min, the removal rate of Cr(VI) can reach 82.3%.
keywords: chitosan; activated sludge; composite adsorbent; copper; chromium; wastewater treatment
analysis and testing
DOI:
10.19289/j.1004-227x.2020.15.012
Determination of zinc, nickel and sodium hydroxide in alkaline zinc-nickel alloy plating solution
Zhang Youliang, Zhang Xifeng (Antai Aike Technology Co., Ltd.)
Abstract: uses inductively coupled plasma atomic emission spectroscopy (ICP-AES) to determine the content of zinc and nickel in alkaline zinc-nickel alloy electroplating solution at the same time, and then the content of sodium hydroxide is determined by titration method. This method is fast and accurate, meeting the actual production requirements.
Keywords: zinc-nickel alloy; electroplating solution; sodium hydroxide; determination; inductively coupled plasma atomic emission spectrum; titration method
DOI:
10.19289/j.1004-227x.2020.15.013
Detection method of alizarin red in aluminum alloy red anodized solution
Ge Yiqing, Tao Chen, Yan Peng, Ma Jinjuan, Li Wei, Cheng Liming (Qing'an Group Co., Ltd.)
Abstract: UV-visible spectrophotometry was used to determine the alizarin red content in aluminum alloy red anodized solution. The pH of the solution to be tested was controlled to be 5.5 by using acetic acid-sodium acetate buffer solution. The maximum absorption wavelength of alizarin red was determined through experiments to be 490 ~ 500 nm. Under optimization conditions, the standard solution was analyzed at 495 nm and the standard curve was drawn with a linear correlation coefficient of 0.999 8. The relative standard deviation of the analysis results is 0.054%, and the recovery rate range is 97.4% to 102.5%. This method is easy to operate and fast, with good precision, and can meet the needs of daily quality control.
Keywords: aluminum alloy; anodization; alizarin red; determination; ultraviolet-visible spectrophotometry
review
DOI:
10.19289/j.1004-227x.2020.15.014
Latest research progress in improving corrosion resistance of magnesium alloys
longqiong, Hu Suli, Li Juan, Wu Jianming, Li Yingfen, Wu Yujiao (Key Experiment of Light Metal Materials Preparation Technology of Guizhou Institute of Technology; Guizhou Institute of Materials and Metallurgical Engineering, Guizhou Institute of Technology, Guizhou Provincial Collaborative Innovation Center for Special Functional Materials)
Abstract: summarizes the progress of alloying, laser surface modification, physical vapor deposition, heat treatment, electrodeposition and other technologies in improving the corrosion resistance of magnesium alloys. The mechanism affecting the corrosion resistance of magnesium alloys is explained from the perspectives of component distribution, precipitation phase, and microstructure structure. The problems existing in the research on corrosion resistance of magnesium alloys and the direction of future efforts are pointed out.
Keywords: magnesium alloy; corrosion resistance; alloying; laser surface modification; physical vapor deposition; heat treatment; electrodeposition; review
fund project: National Natural Science Foundation of China (51664009); Guizhou Provincial Science and Technology Plan Project (Qianke He LH [2016]7099, [2016]7101); Guizhou Provincial Department of Education Innovation Group Project (Qianke He He KY [2016]043); Guizhou Institute of Technology Project (XJGC: 20161212, KJZX17-015, KJZX19-002).
DOI:
10.19289/j.1004-227x.2020.15.015
Electrodeposition method for preparing Bi2Te3-based thermoelectric films
Bu Luxia, Gao Linlin, Yan Zonglan, Lv Lijuan (School of Basic Science, Tianjin Agricultural University)
Abstract: reviewed the preparation process and deposition mechanism of thermoelectric material films from the solution system and deposition substrate used for electrodeposition preparation of Bi2Te3-based films, and looked forward to its future development direction in combination with current research.
Keywords: Bismuth telluride; thermoelectric materials; electrodeposition; film; review
Fund project: Tianjin Application Basic and Frontier Technology Research Plan (15JCQNJC05900); Tianjin Agricultural College Education and Teaching Research and Reform Project (2018–A–15, 2018–B–18, 2018–B–28).
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