The Experts below are selected from a list of 9978 Experts worldwide ranked by ideXlab platform
Yongfang Yang - One of the best experts on this subject based on the ideXlab platform.
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a natural extract of tobacco rob as scale and corrosion inhibitor in Artificial Seawater
Desalination, 2016Co-Authors: Hefang Wang, Yongfang Yang, Rongbin HuAbstract:Abstract The corrosion inhibition performance of tobacco rob extract (TRE) for Q235 corrosion in Artificial Seawater was investigated by potentiodynamic polarization. The experimental results indicate that TRE has good corrosion inhibition performance and the inhibition efficiency increased with the increase of TRE concentration. Scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) indicated that the corrosion inhibition is due to the formation of a chemisorbed film on the steel. The anti-scale property of TRE in Artificial Seawater was also studied by static tests for scale and the scale deposits were analyzed by X-ray diffraction (XRD) and SEM, respectively. The results showed that the scale deposits surface morphology and size were changed in the presence of TRE. The corrosion and scale inhibition results indicated the potential use of TRE as an efficient corrosion and scale inhibitor in Artificial Seawater.
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a natural extract of tobacco rob as scale and corrosion inhibitor in Artificial Seawater
Desalination, 2016Co-Authors: Hefang Wang, Meidan Gao, Yong Guo, Yongfang YangAbstract:Abstract The corrosion inhibition performance of tobacco rob extract (TRE) for Q235 corrosion in Artificial Seawater was investigated by potentiodynamic polarization. The experimental results indicate that TRE has good corrosion inhibition performance and the inhibition efficiency increased with the increase of TRE concentration. Scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) indicated that the corrosion inhibition is due to the formation of a chemisorbed film on the steel. The anti-scale property of TRE in Artificial Seawater was also studied by static tests for scale and the scale deposits were analyzed by X-ray diffraction (XRD) and SEM, respectively. The results showed that the scale deposits surface morphology and size were changed in the presence of TRE. The corrosion and scale inhibition results indicated the potential use of TRE as an efficient corrosion and scale inhibitor in Artificial Seawater.
Hefang Wang - One of the best experts on this subject based on the ideXlab platform.
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a natural extract of tobacco rob as scale and corrosion inhibitor in Artificial Seawater
Desalination, 2016Co-Authors: Hefang Wang, Yongfang Yang, Rongbin HuAbstract:Abstract The corrosion inhibition performance of tobacco rob extract (TRE) for Q235 corrosion in Artificial Seawater was investigated by potentiodynamic polarization. The experimental results indicate that TRE has good corrosion inhibition performance and the inhibition efficiency increased with the increase of TRE concentration. Scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) indicated that the corrosion inhibition is due to the formation of a chemisorbed film on the steel. The anti-scale property of TRE in Artificial Seawater was also studied by static tests for scale and the scale deposits were analyzed by X-ray diffraction (XRD) and SEM, respectively. The results showed that the scale deposits surface morphology and size were changed in the presence of TRE. The corrosion and scale inhibition results indicated the potential use of TRE as an efficient corrosion and scale inhibitor in Artificial Seawater.
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a natural extract of tobacco rob as scale and corrosion inhibitor in Artificial Seawater
Desalination, 2016Co-Authors: Hefang Wang, Meidan Gao, Yong Guo, Yongfang YangAbstract:Abstract The corrosion inhibition performance of tobacco rob extract (TRE) for Q235 corrosion in Artificial Seawater was investigated by potentiodynamic polarization. The experimental results indicate that TRE has good corrosion inhibition performance and the inhibition efficiency increased with the increase of TRE concentration. Scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) indicated that the corrosion inhibition is due to the formation of a chemisorbed film on the steel. The anti-scale property of TRE in Artificial Seawater was also studied by static tests for scale and the scale deposits were analyzed by X-ray diffraction (XRD) and SEM, respectively. The results showed that the scale deposits surface morphology and size were changed in the presence of TRE. The corrosion and scale inhibition results indicated the potential use of TRE as an efficient corrosion and scale inhibitor in Artificial Seawater.
Jianmin Chen - One of the best experts on this subject based on the ideXlab platform.
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sliding friction and wear behaviors of plasma sprayed aluminum bronze coating in Artificial Seawater
Surface and Interface Analysis, 2015Co-Authors: Jie Yang, Guoliang Hou, Huidi Zhou, Jianmin ChenAbstract:The friction and wear behaviors of plasma sprayed aluminum–bronze (CuAl) coating sliding against silicon nitride (Si3N4) in Artificial Seawater were investigated and compared with those in pure water and dry sliding. The morphologies of the worn surfaces were analyzed by three-dimensional non-contact surface mapping and scanning electron microscopy. Moreover, chemical states of the tribochemical products of CuAl/Si3N4 in Seawater were characterized by X-ray photoelectron spectroscopy. Results show that the plasma sprayed CuAl coating possessed a specific wear rate (in order of 10−7 mm3/Nm) in Seawater more than 600 times smaller than that in dry sliding due to the great alleviation in abrasion wear and splats delamination. Besides, the CuAl/Si3N4 had a friction coefficient of 0.06 in Seawater, significantly lower and more stable than those in pure water and dry sliding. The tribochemical products of CuAl/Si3N4 in Seawater, which were proved to be silica, alumina, and their hydrates, transformed into a loosened wear-debris layer under the coagulation effect of the Seawater and dominated the excellent lubrication state in Artificial Seawater. Copyright © 2014 John Wiley & Sons, Ltd.
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Sliding friction and wear behaviors of plasma sprayed aluminum–bronze coating in Artificial Seawater
Surface and Interface Analysis, 2014Co-Authors: Jie Yang, Guoliang Hou, Huidi Zhou, Jianmin ChenAbstract:The friction and wear behaviors of plasma sprayed aluminum–bronze (CuAl) coating sliding against silicon nitride (Si3N4) in Artificial Seawater were investigated and compared with those in pure water and dry sliding. The morphologies of the worn surfaces were analyzed by three-dimensional non-contact surface mapping and scanning electron microscopy. Moreover, chemical states of the tribochemical products of CuAl/Si3N4 in Seawater were characterized by X-ray photoelectron spectroscopy. Results show that the plasma sprayed CuAl coating possessed a specific wear rate (in order of 10−7 mm3/Nm) in Seawater more than 600 times smaller than that in dry sliding due to the great alleviation in abrasion wear and splats delamination. Besides, the CuAl/Si3N4 had a friction coefficient of 0.06 in Seawater, significantly lower and more stable than those in pure water and dry sliding. The tribochemical products of CuAl/Si3N4 in Seawater, which were proved to be silica, alumina, and their hydrates, transformed into a loosened wear-debris layer under the coagulation effect of the Seawater and dominated the excellent lubrication state in Artificial Seawater. Copyright © 2014 John Wiley & Sons, Ltd.
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cavitation erosion of several oxy fuel sprayed coatings tested in deionized water and Artificial Seawater
Wear, 2014Co-Authors: Guoliang Hou, Jianmin Chen, Huidi Zhou, Xiaoqin Zhao, Jie YangAbstract:Abstract Cavitation damage is a concern for stainless steel and other metals in Seawater environments, and new coatings are needed to resist such surface damage in that kind of environment. Consequently, a NiCr alloy coating, a WC–17Co/NiCr composite coating, a Fe-based metallic glass coating, a WC–(W,Cr)2C–Ni cermet coating, and a WC–17Co cermet coating were prepared on metal alloy substrates using high velocity oxy-fuel spraying (HVOF). The microstructure and phase composition of as-sprayed coatings and substrates were analyzed using optical microscopy and X-ray diffraction. Vicker's microindentation hardness was measured as well. The cavitation erosion behavior of the five kinds of HVOF-sprayed coatings and three kinds of alloys (316 stainless steel, TC4 titanium alloy and ZL101 aluminum alloy) in both deionized water and Artificial Seawater was evaluated according to ASTM standard method G 32-10. The corrosion behavior of the alloys and HVOF-sprayed coatings in Artificial Seawater was evaluated by potentiodynamic polarization tests to reveal the correlation between corrosion and cavitation behavior. Based on the test results, an analysis of the microstructural damage processes, and the cavitation–corrosion synergism of the coatings, the WC–17Co cermet coating was found to be the most promising coating to prevent metallic substrates from cavitation damage in Seawater.
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tribological behaviours of pvd tin and ticn coatings in Artificial Seawater
Surface & Coatings Technology, 2013Co-Authors: Lei Shan, Jinlong Li, Xuedong Wu, He Li, Yongxin Wang, Jianmin ChenAbstract:Abstract To improve the tribological performance of sea frictional components, TiN and TiCN coatings, were used for surface protection of the components. The coatings were deposited on stainless steel and WC cemented carbides by arc ion plating. The coating topography was observed using scanning electron microscopy (SEM), and the composition and structure were analyzed by energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD). Hardness and adhesion force were tested by nanoindentation and scratch tester, respectively. The friction and wear properties of the TiN and TiCN coatings were investigated by ball-on-disk tribometer in air, distilled water and Artificial Seawater. The results showed that both the TiCN and TiN coatings had a strong (111) preferred orientation. The friction coefficients of the coatings in distilled water and Artificial Seawater were lower than those in air. This indicates the influence of aqueous solutions on the friction coefficient due to the lubricative film formed on the coatings. However, the wear loss of the coatings in Artificial Seawater was larger than those in air and distilled water, this demonstrates a positive synergism between corrosion and wear in Artificial Seawater. The TiCN coating shows the best wear resistance in the Artificial Seawater.
Zhifeng Zhou - One of the best experts on this subject based on the ideXlab platform.
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Structural and tribological properties of CrMoCN coatings with various Mo contents in Artificial Seawater
Applied Surface Science, 2019Co-Authors: Maoda Zhang, Fei Zhou, Qianzhi Wang, Zhifeng ZhouAbstract:Abstract CrMoCN coatings with various Mo contents were prepared on Ti6Al4V disks and Si wafers using unbalanced magnetron sputtering at various Mo target currents, and their crystallite phases and bonding structures were characterized using XRD and TEM as well as XPS, respectively. The mechanical properties of coatings were measured by nano-indenter and the tribological properties of CrMoCN/SiC tribopairs in Artificial Seawater were tested by ball-to-disk tribo-tester. The results showed that Cr, Mo and N elements mainly existed in the form of (Cr, Mo)N solid solution crystals, while C element mainly existed as amorphous a-C and amorphous a-CNx. The hardness and elastic modulus of CrMoCN coatings increased first, and then decreased as Mo target current further increased to 3.0 A. The friction coefficients and wear rates of CrMoCN/SiC tribopairs decreased overall with the increase in the Mo target current due to the synergistic lubrication and wear-reducing effect of tribolayers (MoO3 and SiO2·2H2O). The abrasive and tribo-chemical wear were the wear mechanisms of CrMoCN/SiC tribopairs. CrMoCN-3.0 coating showed the best tribological properties in the Artificial Seawater.
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electrochemical and tribological properties of crbcn coatings with various b concentrations in Artificial Seawater
Tribology International, 2017Co-Authors: Fei Zhou, Qianzhi Wang, Zhifeng ZhouAbstract:Abstract CrBCN coatings with various B concentrations were deposited by using a closed field unbalanced magnetron sputtering system. Their electrochemical and tribological properties in Artificial Seawater were performed using a conventional three electrode cell and the ball-on-disk tribometer, respectively. The results showed that the CrBCN coatings' corrosion resistance increased continually when the CrB 2 target current increased. Furthermore, the CrBCN coatings exhibited better tribological properties than the CrCN coatings. The lowest friction coefficient (0.15) and the lowest wear rate (1.8 × 10 −7 mm 3 /Nm) were obtained simultaneously.
Gobboon Lothongkum - One of the best experts on this subject based on the ideXlab platform.
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Effect of aluminium on the passivation of zinc–aluminium alloys in Artificial Seawater at 80 °C
Corrosion Science, 2013Co-Authors: Tanapat Kaewmaneekul, Gobboon LothongkumAbstract:Abstract The effect of Al (0.15, 0.3 and 1.0 wt.%) on the passivation of Zn–Al alloys in Artificial Seawater at 80 °C is investigated by electrochemical measurements, scanning electron microscopy (SEM) and X-ray diffraction (XRD). It is found that the presence of Al in Zn–Al alloys can retard passivation. Potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) measurements show that Al increases the current density but decreases the corrosion resistance of passive films, respectively. Mott-Schottky analysis reveals that Al increases the electrical conductivity and the capacitance of the films. Passivation of Zn–Al alloys occurs in Artificial Seawater when the immersion time is between 120 and 288 h, due to the presence of various Zn and Al protective compounds at the surfaces. Depassivation occurs when the immersion time is between 288 and 720 h, probably due to the decrease of solution pH and the Cl− penetration mechanism.
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effect of aluminium on the passivation of zinc aluminium alloys in Artificial Seawater at 80 c
Corrosion Science, 2013Co-Authors: Tanapat Kaewmaneekul, Gobboon LothongkumAbstract:Abstract The effect of Al (0.15, 0.3 and 1.0 wt.%) on the passivation of Zn–Al alloys in Artificial Seawater at 80 °C is investigated by electrochemical measurements, scanning electron microscopy (SEM) and X-ray diffraction (XRD). It is found that the presence of Al in Zn–Al alloys can retard passivation. Potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) measurements show that Al increases the current density but decreases the corrosion resistance of passive films, respectively. Mott-Schottky analysis reveals that Al increases the electrical conductivity and the capacitance of the films. Passivation of Zn–Al alloys occurs in Artificial Seawater when the immersion time is between 120 and 288 h, due to the presence of various Zn and Al protective compounds at the surfaces. Depassivation occurs when the immersion time is between 288 and 720 h, probably due to the decrease of solution pH and the Cl− penetration mechanism.
