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Selective and effective recovery of copper from printed circuit board scraps - Nguyen Trung Hai Thinh4.CONCLUSIONS Copper can be effectively and selectively recovered from waste PCB scrap by the combined mechanical and electrochemical method using nitric acid as leaching agent, followed by electrodeposition. The various steps of mechanical treatment allow formation of fine solid powder containing mainly nonmetallic substances and metallic copp...
10 trang | Chia sẻ: thucuc2301 | Ngày: 28/11/2020 | Lượt xem: 735 | Lượt tải: 0
Cracking corrosion of low carbon steel in environment with a high concentration of Co2 and H2S - Nguyen Thi Le Hien4. CONCLUSIONS The samples tested under the selected downhole environment in a test solution prepared following NACE TM0177, Bent-Beam Test Method, Solution B (SCC and SSC test) showed pitting and general corrosion at both temperatures (24 oC and 82 oC). For the SCC test at 82 oC, microscopy of the samples developed pitting corrosion in the sur...
7 trang | Chia sẻ: thucuc2301 | Ngày: 28/11/2020 | Lượt xem: 626 | Lượt tải: 0
Corrosion resistance and mechanical properties of TiO2 nanotubes /Epoxy coating on steel SPCC-JISG 3141 - Duong Thi Hong Phan4. CONCLUSION Titanium dioxide nanotubes (TNTs) with the diameters of about 10-20 nm were successfully synthesized via the hydrothermal method. Characterization results were confirmed by TEM, XRD analysis, BET and FTIR spectroscopes. The SPCC-JISG 3141 was coated successfully by TiO2 nanotube/ epoxy systems. Additionally, mechanical characteri...
7 trang | Chia sẻ: thucuc2301 | Ngày: 28/11/2020 | Lượt xem: 671 | Lượt tải: 0
Different behaviors of zinc rich paint against corrosion in atmospheric zone and tidal zone of industrial port environment - Vinh Dat Vuong4. CONCLUSIONS Comparison between results of accelerated tests and field exposure tests indicated that growth of blisters on ZRP proportionate with time of wetness and temperature. Results of accelerated tests show that high temperature, concentration of dissolved oxygen, time of wetness increased blister growing rate. In field exposure test, t...
9 trang | Chia sẻ: thucuc2301 | Ngày: 28/11/2020 | Lượt xem: 725 | Lượt tải: 0
Influence of nickel concentration on the characteristics of the electroplating Zn-Ni alloy - Bui Thi Thanh Huyen4. CONCLUSIONS The morphology and structure surface of the electrodeposited Zn-Ni alloy coating depended on nickel concentration the plating bath. The Zn-Ni coatings with high nickel content, the crystals develop pyramidal orientation and the surface structures were single phase; the coatings with lower nickel content, the crystals were slightl...
7 trang | Chia sẻ: thucuc2301 | Ngày: 28/11/2020 | Lượt xem: 817 | Lượt tải: 0
Corrosion protection and chacracteristics of Ni-CeO2-cuo electroplating layer on steel substrate - Mai Van Phuoc4. CONCLUSION The Ni-CeO2-CuO composite was successfully deposited on steel substrate by electroplating. It had a good corrosion resistance in 3.5 % NaCl solution and under salt spraying as well hygrothermal environment. This composite also had invaluable properties such as the hardness and wear resistance increasing 1.47 times and more than 3 ...
6 trang | Chia sẻ: thucuc2301 | Ngày: 28/11/2020 | Lượt xem: 660 | Lượt tải: 0
Study on corrosion resistance of carbon nanotubes reinforced Al2O3 coating - Nguyen Van Tuan3.5. Erosion corrosion resistance Figure 9 shows the results of the erosion corrosion resistance test for the coating over time. The result shows that, the mass loss of Al2O3 sample is higher than that of CNTs/Al2O3 one at all measuring times after 24 - 168 hours of test. This indicates that the erosion corrosion resistance of CTNs reinforced c...
10 trang | Chia sẻ: thucuc2301 | Ngày: 28/11/2020 | Lượt xem: 655 | Lượt tải: 0
Bentonite pillared by mesoporous silica and its application for gasoline treatment - Vo Thi My Nga4. CONCLUSIONS BHSMC can be able to join in Cumen cracking reaction with conversion 36.46 % at 350 oC, in the bed-flow system, WHSV = 1.72 h-1 and the selectivity of benzene is 73.98 %. Conversion, efficiency of gasoline and of LPG in Wax cracking reaction at 460 °C on BHSMC were the highest in comparison with other catalysts: BHSMC got convers...
7 trang | Chia sẻ: thucuc2301 | Ngày: 28/11/2020 | Lượt xem: 726 | Lượt tải: 0
Ffects of additives, pigment and filler on physicomechanical properties and weather resistance of polyurea coatings - Nguyen Thi Bich Thuy4. CONCLUSIONS A novel polyurea coating composition with 0.2 wt% Raybo 3 antisilk flow resistance agent (of total paint composition), 1 wt% Texaphor dispersing agent (of total filler and piment), 2.8 wt% DOP (of total paint composition), 32 wt% BaSO4, 50 wt% TiO2, and 3 wt% nanoclay was proposed and the best physico-mechanical characteristics w...
11 trang | Chia sẻ: thucuc2301 | Ngày: 28/11/2020 | Lượt xem: 715 | Lượt tải: 0
Understanding corrosion behavior of Zn and Zn alloy galvanized steels in humid tropical climate - Nguyen Nhi Tru4. CONCLUSIONS Corrosion rates of hot dip zinc coatings at Nha Trang coastal site exceed the values obtained for My Tho rural atmosphere by several times. Meanwhile, hot dip Zn-Al coatings express higher corrosion resistance at both atmospheres. The corrosion process obeys an equation of the form M = Atn, where M is the loss of metal and t is t...
13 trang | Chia sẻ: thucuc2301 | Ngày: 28/11/2020 | Lượt xem: 713 | Lượt tải: 0
