Facile Preparation of the Superhydrophobic Surface on Aluminum Alloy by PP-Coating

2012 ◽  
Vol 583 ◽  
pp. 342-345 ◽  
Author(s):  
Wen Yong Liu ◽  
Lin Yu Sun ◽  
Yu Ting Luo ◽  
Ruo Mei Wu ◽  
Hai Yun Jiang ◽  
...  
Keyword(s):  
Contact Angle ◽  
Aluminum Alloy ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Superhydrophobic Surface ◽  
Suitable Method ◽  
Optical Contact ◽  
Nano Structure ◽  
Facile Preparation ◽  
Scanning Electron

We investigated the preparation of the superhydrophobic surface on aluminum alloy by PP coating. The effects of PP concentration and duration on the surface were discussed. The contact angle (CA) was measured by an optical contact angle meter and the morphology of the surface was observed by a scanning electron microscope. The result showed that the superhydrophobic surface on aluminum alloy could be facilely fabricated by direct PP coating with a suitable concentration. It was confirmed by SEM that the superhydrophobic surface was resulted from the micro/nano-structure of PP. However, the CA became much lower as time went on. It was indicated that the duration of the superhydrophobic surface on aluminum alloy by direct PP coating was poor and a suitable method for improving the duration should be adopted.

scholarly journals Blended PVA/PVP Electro spun nanofibers for Coating Application

2021 ◽  
Vol 2114 (1) ◽  
pp. 012031
Author(s):  
R Mohammed ◽  
H Jawad ◽  
A. Al-Zubiedy
Keyword(s):  
Electrical Conductivity ◽  
Contact Angle ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Weight Ratio ◽  
Polymeric Materials ◽  
Vinyl Pyrrolidone ◽  
Pumping Rate ◽  
Coating Application ◽  
Scanning Electron

Abstract The use of polymeric blended nanofibres is one of the recent applications in the food and liquid packaging. The current research aims to prepare the nanofibers coatings from the blend of polymeric materials via the electro spinning technique 0.08 weight ratio concentration of polyvinyl alcohol (PVA) dissolved in water, as well as, (0.2 weight ratio concentration ) of poly vinyl pyrrolidone (PVP) were used to obtain different volume proportions of (PVA:PVP) solutions include (100:0, 80:20,70:30, 50:50, 20:80, and 0:100). The electro spinning system was organized with pumping conditions (20 kV for the applied voltage, 20 cm pumping distance, 1ml/hr pumping rate) and a needle diameter with 0.4mm diameter. The properties of the polymeric solutions involve (viscosity, surface tension, and electrical conductivity of the liquid) were examined. A scanning electron microscope technique was used to study the surface properties of the prepared films, and the contact angle via the contact angle analyzer was examined. The results of a scanning electron microscope proved that the diameter of the nano fibers increases with increasing the concentration and viscosity of solutions and decreasing its electrical conductivity. Also, the results of the contact angle analyzer showed an increase the hydrophilic property via increasing percentage of polyvinylpyrrolidone.

An Investigation on the Impurities of Aluminum Alloy in Melt Furnace

2010 ◽  
Vol 97-101 ◽  
pp. 1045-1048
Author(s):  
Zheng Bin Xu ◽  
Yong Zhi Zou ◽  
Wen Chao Wang ◽  
Xing Zhi Pang ◽  
Jian Min Zeng
Keyword(s):  
Aluminum Alloy ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Elemental Carbon ◽  
Energy Dispersive Spectrometer ◽  
Furnace Wall ◽  
Sio2 Particle ◽  
A357 Alloy ◽  
Unknown Phase ◽  
Scanning Electron

The scanning electron microscope (SEM) and energy dispersive spectrometer (EDS) were used to characterize samples prepared from the surface scum of melt, the middle flake residues on the furnace wall and the “bottom bulk” after the A357 alloy pouring. The morphology and impurities composition of these features were investigated. Some of particles and regions in samples during the analyses were also studied in detail. The results of analyses show that the surface scum of melt include Al2O3, MgO or MgAl2O4; the impurities of the middle flake residues is comprised of Al2O3, MgO or MgAl2O4, as well as SiO2 particle, Al9Fe2Si2 compound and dimple like C-rich areas; the bottom bulk contains C-rich impurities such as Al4C3 or some of unknown phase or elemental carbon.

The Surface Deformation of Aluminum Compressed With Viscous Lubricants

1974 ◽  
Vol 96 (4) ◽  
pp. 591-594 ◽  
Author(s):  
D. D. Ratnagar ◽  
H. S. Cheng ◽  
J. A. Schey
Keyword(s):  
Aluminum Alloy ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Surface Finish ◽  
Surface Deformation ◽  
Surface Roughening ◽  
6061 Aluminum Alloy ◽  
Clear Delineation ◽  
Lubricant Viscosity ◽  
Scanning Electron

The influences of lubricant viscosity and loading velocity on the surface finish of plastically compressed 6061 aluminum alloy cylinders were studied. Specimens with polished end faces were subjected to compression between two flat, chromium plated dies, with lubricants of a viscosity ranging from 42 cp to 1207 cp at 38 deg C. The deformed surfaces were studied under a scanning electron microscope and by stylus tracings and CLA readings. With the lighter lubricants surface roughening resulted from preferential yielding leading to a clear delineation of grain boundaries and slip lines. With the heavier lubricants, localized “hydrodynamic pockets” formed in addition to the above features. The depth of pockets increased with viscosity and/or velocity.

Effect of PEO on the Hydrophilicity of PLLA Ultrafine Fibers

2012 ◽  
Vol 535-537 ◽  
pp. 2390-2393
Author(s):  
Jia Xu ◽  
Jin Xian Wang ◽  
Xiang Ting Dong ◽  
Gui Xia Liu ◽  
Wen Sheng Yu
Keyword(s):  
Tissue Engineering ◽  
Extracellular Matrix ◽  
Contact Angle ◽  
Lactic Acid ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Polyethylene Oxide ◽  
Water Contact ◽  
Ultrafine Fibers ◽  
Scanning Electron

The Polyethylene oxide (PEO) / Poly (L-lactic acid) (PLLA) ultrafine blend fibers have been prepared by electrospinning. The hybrid solvent of trichloromethane and ethanol was found to be the co-solvent for electrospinning. The PEO/PLLA blend solutions in various ratios were studied for electrospinning into ultrafine fibers. The morphology of the fibers was shown by scanning electron microscope (SEM). The hydrophilicity of fiber samples was characterized by determining their water contact angle. The spun ultrafine fibers are expected to be used in the native extracellular matrix for tissue engineering.

STUDI EKSPERIMENTAL PENGENDALIAN LAJU KOROSI FATIK PADA ALUMINIUM 2024-T3 DI LINGKUNGAN AIR LAUT MELALUI PENAMBAHAN INHIBITOR KALIUM KROMAT (K2CrO4)

2017 ◽  
Author(s):  
Waris Wibowo
Keyword(s):  
Aluminum Alloy ◽  
Electron Microscope ◽  
Corrosion Rate ◽  
Scanning Electron Microscope ◽  
Sea Water ◽  
Good Mechanical Property ◽  
Aluminum Alloy 2024 ◽  
Fatigue Corrosion ◽  
Al 2024 ◽  
Scanning Electron

<p>Aluminum alloy 2024-T3 is widely used in manufacturing industries such as aircraft, automotive and ship industries due to its character as a good mechanical property. Aluminum alloy2024-T3, however, is easily suffered from corrosion attack when it is applied in corrosive environment such as sea water. One of the corrosion rate control methods is by applying inhibitor addition. This research aims to study the effect of K2CrO4 inhibitor in controlling the rate of corrosion of Al 2024-T3 in sea water. In this research, K2CrO4 was added to sea water environment with various concentrations of 0.1 %, 0.3% and 0.5%. Subsequently the corrosion rates were measured using a-three-electrode potential technique with saturated calomel (Hg2Cl2) as a referenced electrode whereas the auxiliary electrode was platinum (PT). Fatigue corrosion experiments was done using servo hydraulic testing engine, sinusoidal load was chosen with the stress ratio of R= Smin/Smaks = 0,1, and the frequence of 15 Hz, the voltage level used was 20%. Composition analyses, micro structure examination with Scanning Electron Microscope (SEM) were also done to get the supporting data. The results show that fatigue corrosion rate of aluminum alloy 2024-T3 with the additions of K2CrO4 inhibitor in the sea water tends to reduce at the optimum concentration of 0.5% of K2CrO4. It is indicated by the reduction of fatigue corrosion rate as amount of 32.13%. This inhibitor may hamper the rate of fatigue corrosion by oxidation so that it produces a compound (passive film) which covers the surface of Aluminum alloy 2024-T3 which is in turn it will reduce the attack of corrosion.</p><p><strong>Keywords : Aluminum Alloy 2024-T3, Fatigue Corrosion, K2CrO4 Inhibitor</strong></p><p><br /> ABSTRAK<br /> Aluminium paduan seri 2024-T3 telah banyak diaplikasikan pada industri pesawat terbang, otomotif, dan kapal laut karena memiliki sifat mekanik yang baik. Namun demikian aluminium paduan 2024- T3 rentan terhadap korosi bila diaplikasikan di lingkungan yang korosif seperti air laut. Salah satu upaya untuk mengendalikan laju korosi adalah dengan penambahan inhibitor. Penelitian ini bertujuan untuk mempelajari pengaruh inhibitor kalium kromat (K2CrO4) dalam mengendalikan laju korosi Al 2024-T3 di lingkungan air laut. Pada penelitian ini, jenis inhibitor yang dipakai adalah kalium kromat (K2CrO4) yang ditambahkan di media air laut dengan variasi konsentrasi 0,1%; 0,3%; dan 0,5%. Selanjutnya laju korosi diukur dengan menggunakan metode sel potensial tiga elektroda yang menggunakan kalomel jenuh (Hg2Cl2) sebagai elektroda baku sedangkan elektroda tambahan digunakan platina. Pengujian korosi fatik dengan mesin uji servohidraulik, beban sinusoidal dipilih rasio tegangan R= Smin/Smaks = 0,1 dan frekuensi 15 Hz, level tegangan yang digunakan adalah 20%. Sebagai data pendukung dilakukan uji komposisi dan uji struktur mikro dengan Scanning Electron Microscope (SEM). Hasil penelitian ini memperlihatkan bahwa laju korosi fatik Al 2024-T3 dengan penambahan inhibitor kalium kromat (K2CrO4) di media air laut cenderung menurun pada konsentrasi optimum 0,5% K2CrO4, ditandai dengan penurunan laju korosi fatik sebesar 32,13%. Inhibitor ini dapat menghambat laju korosi fatik dengan cara mengoksidasi sehingga menghasilkan produk senyawa (lapisan pasif) yang dapat menutup permukaan Al 2024-T3 yang dapat mengurangi serangan korosi.</p><p><strong>Kata kunci : Aluminium Paduan 2024-T3, Korosi Fatik , Inhibitor K2CrO4</strong></p><p> </p>

Effects of Microporosity on the Tensile Properties of Aluminum Alloy

2011 ◽  
Vol 422 ◽  
pp. 627-631 ◽  
Author(s):  
Xie Hua Li ◽  
Li Zi He ◽  
Yi Heng Cao ◽  
Pei Zhu ◽  
Ya Ping Guo ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Hydrogen Content ◽  
Optical Microscope ◽  
Slip Step ◽  
Inclusion Content ◽  
1050 Aluminum Alloy ◽  
Scanning Electron

The influences of cooling rate, hydrogen inflating time, degassing time, inclusion content on the distribution of pores within the ingot , hydrogen content and the mechanical properties of 1050 aluminum alloy were investigated by tensile test, optical microscope(OM), scanning electron microscope(SEM). With the increasing inflating hydrogen time, the hydrogen content increases, while, the strengths and elongation decrease. With the increasing degassing time, the hydrogen content decreases, while, the strengths and the elongation increase. With increasing cast temperature, the hydrogen content remains constant at first and increases obviously from 7200C to 7600C, while the strengths and the elongation decrease gradually. The crack is mainly originated at outcrop of slip step, inclusion and porosity.

Mechanical Properties and Microstructure Analysis of Aluminum and Steel Dissimilar Material Weld Joint

2014 ◽  
Vol 511-512 ◽  
pp. 17-21
Author(s):  
Jian Bing Chen ◽  
Chi Peng ◽  
Dong Hai Cheng ◽  
Dong Xu Cheng ◽  
Yi Ping Chen
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Aluminum Alloy ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Intermetallic Compounds ◽  
Weld Joint ◽  
Solution Phase ◽  
Solid Solution Phase ◽  
Scanning Electron

LF16 aluminum alloy and Q235 steel were brazed by Zn-Al solder and the Al-Si-Cu solder. Metallographic microscope and scanning electron microscope were used to observe the microstructure of weld joint. The result shows that the strength of the joints, which were welded with Zn-Al solder reached 133.6Mpa. Zn-rich solid solution phase and Al-rich solid solution phase existed in Zn-based solder brazing seam. The Fe element trend was gradual changed, while Al element trended more gently, and generated Fe2Al5 intermetallic compounds in the joints in both the brazing joint of Zn-based and Al-based solder.

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