Determination of atmospheric corrosion rate of metals in 12 Vietnamese areas - Pham Duy Nam4. CONCLUSIONS Most areas in the mainland of Vietnam has moderate or high corrosion rates for all four standard metals. In marine and coastal atmospheric regions, levels of corrosion are higher. It is particularly high on offshore islands. For instance, a CX corrosion level (extreme level) was found on Bach Long Vy island for steel samples. In...
7 trang | Chia sẻ: thucuc2301 | Ngày: 28/11/2020 | Lượt xem: 778 | Lượt tải: 0
Study on the properties of silver plating on A6061 aluminum alloy - Vu Minh Thanh4. CONCLUSION From the properties of the silver plating on the A6061 base, it can be showed that the plating was homogeneous, smooth and shiny structure, with a thickness of about 9.7 μm. The plating has a chemical composition and phase composition of silver metal with very high purity. Measurement results of corrosion current, frost accelerati...
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Recoveringrare earth oxide from NdFeB magnet of waste hdds by leaching and selective precipitation methods - Pham Khanh Huy4. CONCLUSION The recovery of Neodymium from NdFeB magnet which contains 26 % of total rare earth and 60 % of Fe by crystallization and precipitation method has worked. Magnetic flux density of the NdFeB magnet was eliminated completely at 300 ºC after one hour in electric furnace. By the using selective crystallize and precipitation method by ...
8 trang | Chia sẻ: thucuc2301 | Ngày: 28/11/2020 | Lượt xem: 673 | Lượt tải: 0
Influence of monoethylene glycol on corrosion inhibitor of wet gas pipeline - Nguyen Thi Le Hien4. CONCLUSIONS MEG is a weak acid and causes a decrease in the pH of the solutions with increasing amounts of MEG, while in CO2 saturated solutions the pH of the solution is determined by the partial pressure of CO2. An increase in the MEG concentration results in a decrease in the corrosion rate at all concentrations and conditions of testing...
11 trang | Chia sẻ: thucuc2301 | Ngày: 28/11/2020 | Lượt xem: 623 | Lượt tải: 0
An investigation of aganoerion polymorphum leaf extract as a copper working fluids’additive4. CONCLUSIONS The study has shown that metal working fluids still retained the necessary properties such as flash point and pour point when add an inhibitor performance of an Aganonerion Polymorphum leaf extract. Both Aganonerion Polymorphum leaf extract and imidazoline had a good inhibitory effect on copper corrosion on the investigate soluti...
10 trang | Chia sẻ: thucuc2301 | Ngày: 28/11/2020 | Lượt xem: 699 | Lượt tải: 0
Synthesis and catalytic activity of branched gold nanoparticles in AQUEOUS MEDIUM - Phan Ha Nu Diem4. CONCLUSIONS In summary, the combination of CTAB and the Pluronic F-127 yielded stable complexes that act as co-directing agents and favor the anisotropic growth of gold nanostructures in the form of multi-branched nanoparticles with diameter in the range of 80 – 120 nm. The importance of the existence of polymeric coatings on both AuNPs surf...
9 trang | Chia sẻ: thucuc2301 | Ngày: 28/11/2020 | Lượt xem: 709 | Lượt tải: 0
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: 691 | 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: 592 | 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...
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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: 670 | Lượt tải: 0
