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Search Results: 1 - 10 of 4483 matches for " aluminium alloy "
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Effects of Anodizing Parameters in Tartaric-Sulphuric Acid on Coating Thickness and Corrosion Resistance of Al 2024 T3 Alloy  [PDF]
Mohammad Zaki Mubarok, ? Wahab, ? Sutarno, Soleh Wahyudi
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2015, DOI: 10.4236/jmmce.2015.33018
Abstract: 2024 T3 is one of aluminium alloys which are widely used in the aircraft structures. Anodizing of alluminium alloy in tartaric-sulphuric acid (TSA) electrolyte is developed to obtain more environmentally-friendly process and to produce anodize layer with better corrosion resistance. In this research work, the influences of anodizing parameters of Al 2024 T3 in TSA on the thickness, weight and corrosion resistance of the anodize layer are studied. Corrosion resistance test was carried out by conducting salt spray test for 336 hours and anodic polarization measurements using potentiostat. Results of three-factor analysis of variance (ANOVA) demonstrated that the most influencing factor that determines the thickness and weight of the anodize layer is temperature, followed by applied voltage, duration of anodizing, voltage-temperature interaction, interaction of temperature-duration of anodizing, interaction of voltage-temperature-duration of anodizing, and interaction of voltage and duration of anodizing. The pit density and corrosion current density (icorr) were found to be dependent on the coating thickness. The anodize layer with a thickness of higher than 3 μm was not experienced to pitting corrosion during 336 hours of salt spray test.
Microstructure and Mechanical Properties of as Cast Aluminium Alloy 7075/Basalt Dispersed Metal Matrix Composites  [PDF]
S. Ezhil Vannan, S. Paul Vizhian
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2014, DOI: 10.4236/jmmce.2014.23023
Abstract: This paper aims to study the effects of short basalt fiber reinforcement on the mechanical properties of cast aluminium alloy 7075 composites containing short basalt fiber of content ranging from 2.5 to 10 percent by weight in steps of 2.5 percent and fabricated using compo-casting technique. The objective is to investigate the process feasibility and resulting material properties such as young’s modulus, ductility, hardness & compression strength. The properties obtained are compared with those of as-cast that were manufactured under the same fabrication conditions. The results of this study revealed that, as the short basalt fiber content was increased, there were significant increases in the ultimate tensile strength, hardness, compressive strength and Young’s modulus, accompanied by a reduction in its ductility. Furthermore, the microstructure & facture studies were carried out using Optical Microscopy (OM) and Scanning Electron Microscopy (SEM) in order to establish relationships between the quality of the fiber/aluminium interface bond and hence to link with mechanical properties of the composites.
Effects of Tin on Aluminum–Zinc–Magnesium Alloy as Sacrificial Anode in Seawater  [PDF]
L.E. Umoru, O.O. Ige
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2008, DOI: 10.4236/jmmce.2008.72009
Abstract: This work has investigated the effect of tin composition on Al-Zn-Mg alloy as sacrificial anode in seawater. Corrosion experiments were mounted to determine the optimal effect of tin on the efficiencies of the aluminium alloy anodes. The corroded and unexposed sample surfaces were subject to microstructural characterization using optical microscopy technique. Al-Zn-Mg alloy doped with 0%, 0.01%, 0.05% and 0.1% by weights of tin were prepared to determine the effect of tin on anode efficiency in the environment. The different microstructures of the Al-Zn-Mg-Sn alloy evolved were correlated with the anode efficiencies. The results obtained showed that the anode efficiency of Al-Zn-Mg-Sn alloy increased with tin concentration. The Al-Zn-Mg-0.1Sn gave the best anode efficiency. The microstructures of the Al-Zn-Mg-Sn alloys revealed increased distribution of tin globules and a breakdown of passive alumina film network on the anodes surfaces and thus improving the anode efficiencies
Effect of filtration on reoxidation proceses in aluminium alloys
D. Bolibruchova,A. Sládek,M. Br?na
Archives of Foundry Engineering , 2010,
Abstract: This article is focused on reoxidation processes during filtration of aluminium alloys. Many of our experimental works pointed out, that using filtration media placed in gating system causes reoxidation of poured aluminium alloy. Main aim of our latest work was to validate our arguments, that filter in gating system can be considered as obstacle for continuous pouring, with help of computer simulations. This article is only a small part of our researches focused on reoxidation processes during filtration of aluminium alloys.
Electrorefining of aluminum alloy in ionic liquids at low temperatures
Kamavaram V.,Mantha D.,Reddy R.G.
Journal of Mining and Metallurgy, Section B : Metallurgy , 2003, DOI: 10.2298/jmmb0302043k
Abstract: The electrorefining of aluminum alloy (A360) in ionic liquids at low temperatures has been investigated. The ionic liquid electrolyte was prepared by mixing anhydrous AlCl3 and 1-Butyl-3- methylimidazolium chloride (BMIC) in appropriate proportions. The effect of the cell voltage temperature, and the composition of the electrolyte on the electrorefining process has been studied. The characterization of the deposited aluminum was performed using scanning electron microscopy (SEM) and X-ray diffraction (XRD) techniques. The influence of experimental parameters such as cell voltage and concentration of AlCl3 in the electrolyte on the deposit morphology was discussed. The composition of the aluminum deposits was analyzed using X-ray fluorescence spectrometer (XRF). Aluminum deposits with purity higher than 99.89 % were obtained. At a cell voltage of 1.0 V vs. Al/Al(III), the energy consumption was about 3 kWh/kg-Al. The main advantage of the process is low energy consumption compared to the existing industrial aluminum refining process.
Surface modification of aluminium - lithium alloy using prenitriding option and SixNy coating deposition
?. Kaczmarek,J. Sawicki,K. Kyzio?,D. Siniarski
Journal of Achievements in Materials and Manufacturing Engineering , 2009,
Abstract: Purpose: EU directive of CO2 emission reduction causes many applied technologies to become unprofitable considering environmental protection. Due to that, there is an urgent need to create new or modify existing technological solutions - especially in the field of materials engineering. One of the options to reduce CO2 emission is replacement of parts made of steel by Aluminum -Lithium alloys mainly in such branches like automotive and aircraft industry.Design/methodology/approach: Prenitriding option was carried out in low pressure plasma discharge mode, at a substrate temperature below 200oC followed by the deposition of 500 nm thick SixNy coating. Morphology and mechanical properties were compared with substrate without prenitriding treatment.Findings: In this paper, first promising results of surface treatment with the use of prenitriding option of Al-Li alloy are presented. The results showed that the wear resistance of the Al-Li alloy may be modified by application of plasma enhanced CVD [1-4]. Two different types of surface modification were applied.Research limitations/implications: In case of vehicles’ parts, subjected to wear or/and contact fatigue a use of light weight alloys gives rise to many difficulties, caused by their low surface parameters. The aluminium alloys applied for elements operated in wear contact even with the best possible mechanical properties at the moment, it is limited due to still not enough tribological properties. The research in this field may bring another reduction of vehicles total weight.Practical implications: At present, ultra light materials with high durability are elaborated for components,e.g. in automotive industry mainly to realize a light gearbox.Originality/value: Functional Gradient Coatings (FGC) was deposited below temperature which could cause destruction of “tailored” structure of the substrate.
Corrosion mechanism of Al-Zn-In alloys in chloride solutions
Mu?oz,A. G.; Saidman,S. B.; Bessone,J. B.;
Latin American applied research , 2003,
Abstract: the electrochemical behavior of al-zn-in alloys was investigated in chloride media by means of potentiodynamic techniques, complemented by scanning electron microscopy (sem), energy dispersive x-ray analysis (edx) and transmission electron microscopy (tem). the influence of local alkalization produced by previous cathodization was analyzed at potentials more negative than the rest potential. the electrochemical response of alloys is given by the sum of those corresponding to the different present phases. thus, the electrochemical behavior of each metal and bimetallic alloy (al-in, in-al and zn-in) was analyzed in the same solution conditions at a potential region near the corrosion potential of the ternary alloy. the low solubility of in in al favors its segregation at grain boundaries, where the formation of zn-in alloys was detected. the initiation of the attack in the al-zn-in alloy is mainly localized in these zones. this is a consequence of the enhanced adsorption and surface accumulation of cl- promoted by in at potentials more positive than - 1.1 vsce. close similarities of the anodic behaviors of the al-in and ternary alloys lead us to propose a mechanism where the in distribution plays the major role. the in dissolution from homogeneous solid solution phases allows an enrichment of this element at the al and zn rich phases by displacement reactions. (al,zn)in + cl- ? incl2+ + 3 e- 2 incl2+ + 3 zn ? 2 in0 + 3 zn2+ + 2 cl- this, in turn, assures an accumulation of adsorbed cl-, which maintains an active state of the al matrix. thus, the rapid zn dissolution reaction ensures a better redistribution of in, so bringing the system towards potentials near those for cl- adsorption on in. the attack morphology was also analyzed in order to explain the smooth wide cavities embracing many grains.
Corrosion mechanism of Al-Zn-In alloys in chloride solutions
A. G. Mu?oz,S. B. Saidman,J. B. Bessone
Latin American applied research , 2003,
Abstract: The electrochemical behavior of Al-Zn-In alloys was investigated in chloride media by means of potentiodynamic techniques, complemented by Scanning Electron Microscopy (SEM), Energy Dispersive X-Ray Analysis (EDX) and Transmission Electron Microscopy (TEM). The influence of local alkalization produced by previous cathodization was analyzed at potentials more negative than the rest potential. The electrochemical response of alloys is given by the sum of those corresponding to the different present phases. Thus, the electrochemical behavior of each metal and bimetallic alloy (Al-In, In-Al and Zn-In) was analyzed in the same solution conditions at a potential region near the corrosion potential of the ternary alloy. The low solubility of In in Al favors its segregation at grain boundaries, where the formation of Zn-In alloys was detected. The initiation of the attack in the Al-Zn-In alloy is mainly localized in these zones. This is a consequence of the enhanced adsorption and surface accumulation of Cl- promoted by In at potentials more positive than - 1.1 V SCE. Close similarities of the anodic behaviors of the Al-In and ternary alloys lead us to propose a mechanism where the In distribution plays the major role. The In dissolution from homogeneous solid solution phases allows an enrichment of this element at the Al and Zn rich phases by displacement reactions. (Al,Zn)In + Cl- InCl2+ + 3 e- 2 InCl2+ + 3 Zn 2 In0 + 3 Zn2+ + 2 Cl- This, in turn, assures an accumulation of adsorbed Cl-, which maintains an active state of the Al matrix. Thus, the rapid Zn dissolution reaction ensures a better redistribution of In, so bringing the system towards potentials near those for Cl- adsorption on In. The attack morphology was also analyzed in order to explain the smooth wide cavities embracing many grains.
Printing on Anodized Aluminium Surface  [PDF]
Stamatina Theohari, Isidoros Iakovidis, Athanasios Karampotsos, Ioannis Sianoudis
Open Journal of Applied Sciences (OJAppS) , 2016, DOI: 10.4236/ojapps.2016.611069
Abstract: Anodizing of aluminium is widely applied when a controllable morphology and properties of the surface are required. Anodic oxide films may be developed by appropriate selection of electrolyte and film-forming conditions for various applications in the fields of architecture, aerospace, electronics, packaging and printing. In the present study, the printability of aluminium with respect to anodizing conditions is discussed. In particular, AA1050 alloy specimens were anodized in either sulfuric acid or phosphoric acid at temperatures ranging from 10?C to 40?C, thereby affecting the porosity and anodic layer thickness. Both the porosity and oxide thickness increase with the temperature, whereas anodization in phosphoric acid produces thinner and more porous layer than that in sulfuric acid. After the anodization step, two different printing techniques were used (i.e. digital printing and screen printing). Printed specimens were characterized by means of colour parameters, microscopy, adhesion and light fastness test. Colour parameters and ink adhesion measurements indicate that both digital and screen printing techniques give a better print quality when the anodization step is conducted in the range of 20?C - 30?C.
Process Parameters Optimization of an Aluminium Alloy with Pulsed Gas Tungsten Arc Welding (GTAW) Using Gas Mixtures  [PDF]
Pawan Kumar, Kishor Purushottamrao Kolhe, Sashikant Janardan Morey, Chanchal Kumar Datta
Materials Sciences and Applications (MSA) , 2011, DOI: 10.4236/msa.2011.24032
Abstract: This paper demonstrates the enhancement of mechanical properties and effective optimization of pulsed GTAW process parameters on aluminium alloy 6061 using sinusoidal AC wave with argon plus helium gas mixtures. Modified Taguchi Method (MTM) was employed to formulate experimental layout and to study effect of process parameter optimization on mechanical properties of the weld joints. Microstructural characterization of weld joint was carried out to understand the structural property correlation with process parameters.
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