The inhibition ability of 4-amino-5-phenyl-4H-1, 2, 4-trizole-3-thiol （APTT）, ethylenediaminetetra-acetic acid （EDTA） and thiourea （TU） for mild steel corrosion in 1.0 moFL HC1 solution at 30 ℃ was investigated...The inhibition ability of 4-amino-5-phenyl-4H-1, 2, 4-trizole-3-thiol （APTT）, ethylenediaminetetra-acetic acid （EDTA） and thiourea （TU） for mild steel corrosion in 1.0 moFL HC1 solution at 30 ℃ was investigated. Tafel polarization and electrochemical impedance spectroscopy （EIS） were used to investigate the influence of these organic compounds as corrosion inhibitors of mild steel in 1.0 mol/L HC1 solution at 30 ℃. The inhibition mechanism was discussed in terms of Langrnuir isotherm model. Results obtained from Tafel polarization and impedance measurements are in a good agreement. The inhibition efficiency increases with the increase of the inhibitor concentration. The adsorption of the inhibitors on the mild steel surface follows Langmuir adsorption isotherm and the free energy of adsorption AGads indicates that the adsorption of APTT, EDTA, and TU molecules is a spontaneous process and a typical chemisorption.展开更多
Polyacrylamide （PAM） film was electrosynthesized on mild steel by cyclic voltammetry using Ce （IV） salt-oxalic acid as supporting electrolyte. Polymerization was initiated by a free radical that was formed by the ...Polyacrylamide （PAM） film was electrosynthesized on mild steel by cyclic voltammetry using Ce （IV） salt-oxalic acid as supporting electrolyte. Polymerization was initiated by a free radical that was formed by the fast reaction of oxalic acid and Ce （IV）. The electrolysis of the reaction solution resulted in regeneration of Ce （IV）, which could oxidize oxalic acid to produce radicals. The effect of temperature on the yield of electroinitiated polymerization was performed. The potential sweep rates were changed to achieve the polymer film with different thickness. Protective properties of the PAM film for corrosion of mild steel in 1 M NaCI aqueous solution were investigated by potentiodynamic polarization curves and electrochemical impedance spectroscopy （EIS）. The structure of PAM film on mild steel was investigated by using physicochemical methods such as elemental analysis of C, H, N, physical chemical methods and FTIR spectrometer. The influence of scan repetition and scan rate on the formation of polymer film was studied at a current density of 1 mA/cm2. The results of these studies reveal that the corrosion resistance of the PAM-coated mild steel was significantly higher and the corrosion rate was considerably lower than that of uncoated steel. The PAM film was formed with lower sweep rate leading to more positive shift of corrosion potential and greater charge transfer resistance, reflecting higher inhibition for corrosion of the mild steel.展开更多
A novel linear microprobe array(LMPA)has been developed by a conventional microfabrication method from silicon.The LMPA leverages the properties of conventional microwire with additional features of naturally formed r...A novel linear microprobe array(LMPA)has been developed by a conventional microfabrication method from silicon.The LMPA leverages the properties of conventional microwire with additional features of naturally formed regular spacing.With the help of periodic microprobe arrays and double-side V-grooves fabricated in advance between each pair of the two microprobes’rear ends,the number of microprobe units for assembly in one array can be flexibly chosen by cleavage fracture from the LMPA.The fabrication method was demonstrated and the prototype device was assessed by electrochemical impedance spectroscopy(EIS)and in vivo test.The SNR of the spikes recorded was 6.展开更多
基金supported by MOST(No.2012AA110407,No.2011CB935700)National Natural Science Foundation of China(No.21073205,No.21121063)and the Chinese Academy of Sciences
基金Project(UKM-GUP-BTT-07-25-170) supported by Universiti Kebangsaan Malaysia
文摘The inhibition ability of 4-amino-5-phenyl-4H-1, 2, 4-trizole-3-thiol （APTT）, ethylenediaminetetra-acetic acid （EDTA） and thiourea （TU） for mild steel corrosion in 1.0 moFL HC1 solution at 30 ℃ was investigated. Tafel polarization and electrochemical impedance spectroscopy （EIS） were used to investigate the influence of these organic compounds as corrosion inhibitors of mild steel in 1.0 mol/L HC1 solution at 30 ℃. The inhibition mechanism was discussed in terms of Langrnuir isotherm model. Results obtained from Tafel polarization and impedance measurements are in a good agreement. The inhibition efficiency increases with the increase of the inhibitor concentration. The adsorption of the inhibitors on the mild steel surface follows Langmuir adsorption isotherm and the free energy of adsorption AGads indicates that the adsorption of APTT, EDTA, and TU molecules is a spontaneous process and a typical chemisorption.
文摘Polyacrylamide （PAM） film was electrosynthesized on mild steel by cyclic voltammetry using Ce （IV） salt-oxalic acid as supporting electrolyte. Polymerization was initiated by a free radical that was formed by the fast reaction of oxalic acid and Ce （IV）. The electrolysis of the reaction solution resulted in regeneration of Ce （IV）, which could oxidize oxalic acid to produce radicals. The effect of temperature on the yield of electroinitiated polymerization was performed. The potential sweep rates were changed to achieve the polymer film with different thickness. Protective properties of the PAM film for corrosion of mild steel in 1 M NaCI aqueous solution were investigated by potentiodynamic polarization curves and electrochemical impedance spectroscopy （EIS）. The structure of PAM film on mild steel was investigated by using physicochemical methods such as elemental analysis of C, H, N, physical chemical methods and FTIR spectrometer. The influence of scan repetition and scan rate on the formation of polymer film was studied at a current density of 1 mA/cm2. The results of these studies reveal that the corrosion resistance of the PAM-coated mild steel was significantly higher and the corrosion rate was considerably lower than that of uncoated steel. The PAM film was formed with lower sweep rate leading to more positive shift of corrosion potential and greater charge transfer resistance, reflecting higher inhibition for corrosion of the mild steel.
基金supported the National Basic Research Program of China("973"Project)(Grant Nos.2011CB933203 and 2011CB933102)the National Hi-Tech Research and Development Program of China("863"Project)(Grant Nos.2012AA030308 and 2013AA032204)+1 种基金the National Natural Science Foundation of China(Grant Nos.61275200,61335010,61178051 and 61178082)the National Important Scientific Apparatus Developing Project(Grant No.2011YQ04008204)
文摘A novel linear microprobe array(LMPA)has been developed by a conventional microfabrication method from silicon.The LMPA leverages the properties of conventional microwire with additional features of naturally formed regular spacing.With the help of periodic microprobe arrays and double-side V-grooves fabricated in advance between each pair of the two microprobes’rear ends,the number of microprobe units for assembly in one array can be flexibly chosen by cleavage fracture from the LMPA.The fabrication method was demonstrated and the prototype device was assessed by electrochemical impedance spectroscopy(EIS)and in vivo test.The SNR of the spikes recorded was 6.
