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Thu Thuy Thai,Anh Truc Trinh,Thi Thanh Tam Pham,Hoan Nguyen Xuan 한국부식방식학회 2023 Corrosion Science and Technology Vol.22 No.2
In this study, cobalt oxide (Co3O4) and cobalt-doped magnetite (CoFe2O4) nanoparticles were synthesizedby a hydrothermal method. They were then used as corrosion inhibitors for corrosion protection ofAA2024-T3 aluminum alloys. These obtained nanoparticles were characterized by x-ray diffraction, fieldemissionscanning electron microscopy, and Zeta potential measurements. Corrosion inhibition activities ofCo3O4 and CoFe2O4 nanoparticles were determined by performing electrochemical measurements for bareAA2024-T3 aluminum alloys in 0.05 M NaCl + 0.1 M Na2SO4 solution containing Co3O4 or CoFe2O4nanoparticles. Corrosion protection for AA2024-T3 aluminum alloys by a water-based epoxy with or withoutthe synthesized Co3O4 or CoFe2O4 nanoparticles was investigated by electrochemical impedance spectroscopyduring immersion in 0.1 M NaCl solution. The corrosion protection of epoxy coating depositedon the AA2024-T3 surface was improved by incorporating Co3O4 or CoFe2O4 nanoparticles in the coating. The corrosion protection performance of the epoxy coating containing CoFe2O4 was higher than that of theepoxy coating containing Co3O4.
Thu Thuy Thai,Anh Truc Trinh,Gia Vu Pham,Thi Thanh Tam Pham,Hoan Nguyen Xuan 한국부식방식학회 2020 Corrosion Science and Technology Vol.19 No.1
In this paper, the efficiency and the inhibition mechanisms of cobalt salts (cobalt nitrate and cobalt-exchangesilica Co/Si) for the corrosion protection of AA2024 were investigated in a neutral aqueous solution byusing the electrochemical impedance spectroscopy (EIS) and polarization curves. The experimental measurementssuggest that cobalt cation plays a role as a cathodic inhibitor. The efficiency of cobalt cation was importantat the concentration range from 0.001 to 0.01 M. The formation of precipitates of oxides/hydroxides ofcobalt on the surface at low inhibitor concentration was confirmed by the Scanning Electron Microscopy/EnergyDispersive X-Ray Spectroscopy (SEM/EDS) analysis. EIS measurements were also conducted for the AA2024surface covered by water-based epoxy coating comprising Co/Si salt. The results obtained from exposurein the electrolyte demonstrated the improvement of the barrier and inhibition properties of the coating exposedin the electrolyte solution for a lengthy time. The SEM/EDS analysis in artificial scribes of the coatingafter salt spray testing revealed the release of cobalt cations in the coating defect to induce the barrierlayer on the exposed AA2024 substrate.
Duy Nguyen Ngoc,Ho Phuong-Thao,Pham Vinh N. T.,Hoan Nguyen Thi Thu 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.77 No.1
In this paper, we estimate the production cross section of the unknown super-heavy nuclei 309, 312126 via 58Ni + 251Cf and 64Zn + 248Cm combinations by using approximation methods. For each reaction, the competition between compound nucleus (CN) formation and quasi-fission process is also analyzed. We found that the synthesis cross section for the 309126 isotope is about 3 fb, which is about 5 orders of magnitude higher than that for the 312126 nucleus. The results also suggest that a valley exists around the isotope with A = 313 in the production yields for the 126th element. Moreover, the synthesis of the 310-317126 isotopes is still a challenge for experimental techniques due to the small cross sections, which are less than 1 fb.