... anialysis and crack growth modelling in an aircraft alloy AA 2024-T3. ... Thie effect was much less evident in 4340 steel than in the ... For the aluminium. ...
DTIC Science & Technology
... aa 2024-t3, aa 7075-t6 materials related terms: anodic polarization, chromate coatings, chromium addition, copper addition, corrosion protection ...
... materials and material types: aa 2024-t3 materials related terms: corrosion fatigue, crack growth rate, fatigue crack growth, grain size, intergranular ...
... of time. The examined specimens were single layer epoxies on aluminum alloy (AA 2024-T3) substrates. Artificial weathering ...
The objective of this project was to develop an environmentally compliant conversion coating for use on aerospace aluminum alloys (e.g., AA2024- T3). This conversion coating was to replace the current chromate conversion coating processes in both mode of ...
National Technical Information Service (NTIS)
The AFOSR funded program was designed to specifically test the ability of electroactive polymers, especially polyanilines, to provides corrosion protection for aluminums, especially the copper (approximately 4 to 5%) containing AA2024-T3 alloy of key inte...
A microscopic study of the onset of pitting corrosion has been conducted on the important aerospace alloy AA2024-T3 with the aim of understanding the role of intermetallic particles in triggering the formation of deep pits in the corroding surface. By trace element and correlation mapping using ...
NASA Astrophysics Data System (ADS)
Abstract: The effects of stress ratio (R) and crack opening behavior on fatigue crack growth rates (da/dN) for aluminum alloy (AA) 2024-T3 were investigated ...
NASA Website
The corrosion behaviour of a well-investigated aluminium alloy AA2024-T3 in sodium chloride solution was observed via scanning vibrating and ion-selective electrode techniques. A completely new approach to the analysis of the obtained data is demonstrated. The 3D fitting ...
The effect of pretreatment and alloy microstructure on the rate of scribe-creep caused by under-paint corrosion on AA2024 was examined. Scribe- creep experiments were conducted on epoxy polyamide coated AA2024-T3 in 80% relative humidity at 25C, 40C, and ...
or complete segregation of the anodic and cathodic reactions. By employing separate coupled electrodes pure Al, the cathodic and anodic reactions are largely segregated, and the observed current mimics% of the anodic current.16,33 AA2024-T3/copper cells allow the cathodic reaction to proceed on both electrodes
E-print Network
Corrosion is one of the most damaging mechanisms in aluminum alloys used in aerospace engineering structures. In this article, the degradation behavior of AA 2024-T3 as a function of time under corrosive conditions is studied through experiments and modeling. Corrosion experiments were ...
Pitting potentials (E{sub pit}) of aluminum alloy (AA) 2024-T3 (UNS A92024) were improved with additions of 0.01 M sodium chromate (Na{sub 2}CrO{sub 4}, pH 8) and 0.0062 M Na{sub 2}Cro{sub 4} + 0.0038 M chromic acid (H{sub 2}CrO{sub 4}, pH 6) additions to 0.1 M sodium sulfate (Na{sub 2}SO{sub ...
Energy Citations Database
The local electrochemical and chemical characteristics of intrinsic breakdown sites on organically coated aerospace alloys were investigated. Local electrochemical impedance spectroscopy and mapping were used in conjunction with capillary electrophoresis, local pH, and local open-circuit potential measurements to classify the electrochemical activity and chemical properties of ...
The need for toxic chromate replacements in metal-finishing industries has prompted an intensive search for replacement technologies in recent years. Among the replacements that have been proposed, those that are based upon the use of organofunctional silanes rank very high in terms of performance, broad applicability as well as ease of application. This dissertation presents a four-part work: (1) ...
The behavior of chromate conversion coatings (CCCs) on the aluminum aircraft alloy AA 2024-T3 was examined by several types of experiments, using Raman spectroscopy as a primary technique. First, Raman spectra of the CCC film made from a commercial process revealed a Raman feature ...
The localized corrosion of pure aluminum, AA2024-T3 alloy, and in particular the behavior of the intermetallic particles in AA2024-T3 were studied using a technique of scratching the surface with atomic force microscopy (AFM) tips. In situ AFM scratching provides information regarding the ...
13 Strain hardening curve determined from uniaxial tension tests for AA 2024-T3 in LT orientation. Courtesy NASA Langley Research Center. ...
... ship motions in wind and waves, basic ocean wave mechanics ... Initial experimentation on the application of amorphous cladding onto AA2024-T3 ...
In this experimental work the weldability of an Al alloy AA 2024-T3 by using two different laser sources, (CO2 and Nd:YAG), has been tested for experiments. A ROFIN SINAR, 1500 W continuous wave (c.w.) max power level, emitting at 10.6 ?m, and a HAAS TRUMPH source, 3000 W max power level, ...
A comprehensive suite of spectroscopy have been used to study the composition and structure of Chromate Conversion Coatings (CCC) formed on Aluminum Copper (Al-Cu) alloy AA2024-T3 and constituent Intermetallic Compounds (IMCs). Based on previous work the CCC formed over the IMCs is expected to ...
The overall goal of this research was to identify and investigate possible replacements of chromate corrosion inhibitive pigments for aluminum aerospace alloys. This research project was divided into two objectives: (1) to develop high throughput screening (HTS) methods that rapidly and quantitatively assess inhibitor and inhibitor mixture efficacy on aluminum ...
In situ, ex situ, and microscopic Raman spectroscopy were used to examine the interactions of dilute chromate solutions with actively corroding pits in aluminum alloy used for aerospace applications (AA-2024-T3). Approximately 10{sup {minus}3} M Cr(VI) in salt solution greatly reduces ...
... Accession Number : ADD116126. Title : POLISHING ALUMINIUM AND ALUMINIUM ALLOYS BY BARRELLING AND ALLIED PROCESSES,. ...
Inhibitor characteristics of 27 compounds considered as possible replacements for chromate pigments in aerospace paint were investigated. These compounds were tested and screened in solution and not as actual paint additives. In initial testing, aluminum alloy (AA) 2024-T3 (UNS A92024) samples ...
In-situ neutron reflectivity (NR) is used to observe the structure and evolution of a Trivalent Chromium Process (TCP) passive film on Al in a NaCl-D2O solution. Using a split liquid reflectivity cell we mimicked the corrosion process on the anodic sites in alloy AA ...
PubMed
... Accession Number : ADD461690. Title : WETTABILITY OF SIC TO ALUMINIUM AND ALUMINIUM ALLOYS. Corporate Author : ...
... 3al(see ti-3al-13v-11cr), ti-6al-4v, aa 2014-t6, aa 2024-t3, aa 2219-t851, aa 6061-t6, aa 7075-t6, cda 706, custom 450, incoloy 901, inconel 718 ...
The effects of surface pretreatment on the rate of scribe-creep caused by underpaint corrosion on coated AA2024-T3 (UNS A92024) were investigated. Scribe-creep experiments were conducted on epoxy polyamide-coated (average coating thickness:10 micrometers)...
that passivates the surface and inhibits corrosion. KEY WORDS: AA2024-T3, anodic inhibitor, cathodic inhibitorCORROSION SCIENCE SECTION 284 CORROSION--MARCH 2004 0010-9312/04/000035/$5.00+$0.50/0 � 2004, NACE. * Fontana Corrosion Center, Department of Materials Science and Engineering, The Ohio State University
Current research in the areas of aircraft alloy pretreatments and their influence on corrosion have raised fundamental questions regarding the applicability of standard surface preparation and analyzing protocols. Electrochemical techniques along with surface analytical techniques such as Laser Speckle Sensor and X-ray Photoelectron Spectroscopy have demonstrated the ability ...
A novel bifunctional polyhedral oligomeric silsesquioxane (POSS) based silane precursor R(x)R'(y)(SiO(3/2))(8), (x + y = 8), bearing 3-(N-(3-triethoxysilylpropyl)ureido)propyl (ureasil - U) and isooctyl (IO) groups (i.e., U(2)IO(6) POSS) was synthesized, and the corresponding coatings, prepared under the acid hydrolysis conditions, were studied in order to assess their corrosion inhibition of the ...
Chromate-based technology used currently in the aerospace industry provides excellent corrosion protection for the aerospace metals and alloys such as AA 2024-T3. However, chromates are toxic and carcinogenic and the Environmental Protection Agency of the United States has identified chromates ...
... The Growth of Short Fatigue Cracks in an Aluminium Alloy by ... THE GROWTH OF SHORT FATIGUE CRACKS IN AN ALUMINIUM ALLOY by R. Cook ...
... Title : ALUMINIUM-LITHIUM ALLOYS III: COMPARISON OF CORROSION BEHAVIOUR OF LITHIUM-CONTAINING ALUMINIUM ALLOYS AND ...
Aerosol-assisted evaporation-induced self-assembly has been applied to fabricate a wide range of nanoparticle architectures. Ordered core-shell Ce/silica particles are effective for corrosion inhibition of aluminum alloy AA2024-T3. Higher hydrophobicity derived by increasing ...
... Title : SPREADING POWER OF SILUMIN ON ALUMINIUM AND ALUMINIUM ALLOYS IN MOLTEN FLUX IN CONDITIONS SIMULATING BRAZING,. ...
... Accession Number : ADD100584. Title : PREFERRED ORIENTATION IN EXTRUDED ALUMINIUM ALLOY & ALUMINIUM RODS,. ...
... Title : Hydrogen and Porosity in Aluminium-Silicon and Aluminium- Magnesium Alloys. Part 1: Aluminium-Silicon Alloys. ...
... Title : PECULIAR MECHANICAL PROPERTIES OF ALUMINIUM-MAGNESIUM, ALUMINIUM-COPPER AND ALUMINIUM-ZINC ALLOYS AT LOW ...
... and it is interesting to note that an aluminium alloy body has ... Alloys of magnesium and aluminium, and magnesium, zinc and aluminium for the ...
... OF THE CORROSION OF ALUMINIUM ALLOYS BY ORGANIC DYES,. ... AZO COMPOUNDS, METHYL YELLOW, METHYL RED AND METHYL ...
... Title : INHIBITION OF THE CORROSION OF ALUMINIUM ALLOYS IN SODIUM HYDROXIDE SOLUTION,. Corporate Author : ...
... Title : DEVELOPMENTS IN ALUMINIUM ALLOYS BY SOLIDIFICATION AT HIGHER COOLING RATES,. Corporate Author : ...
... Title : ALUMINIUM ALLOY DEVELOPMENT AND EVALUATION FOR AIRCRAFT STRUCTURE PERFORMANCE,. ... Pagination or Media Count : 29. ...
... Accession Number : ADD130459. Title : Grain Refinement of Aluminium and Aluminium Alloys with Ti and TiB(sub 2),. Corporate Author : ...
... Accession Number : ADD119866. Title : Aluminium and Aluminium Alloy Extrusions,. Corporate Author : Personal Author(s) : Woodward,AR. ...
... Title : Stir Cast Aluminium Alloy Matrix Composites. ... discontinuous dispersoid reinforced aluminium alloy matrix composites ... the stir casting route is ...
A literature survey about soldering in general and aluminium alloys soldering in particular is presented. The existing methods of soldering aluminium alloys are described. These include soldering with flux, soldering after preliminary plating, vacuum braz...
... Accession Number : ADD138977. Title : Recent R & D of Aluminium Alloys for Aircraft Applications--Part 1. Aluminium-Lithium Alloys,. ...
... Title : Environmental Fatigue of Aluminium Alloy Structural Joints. ... Many corroision fatigue tests have been done on aluminium alloys. ...
... Title : Cast Aluminium Alloy-Mica Composite. ... uncoated mica particles in an aluminium alloy matrix. ... of mica particles in the casting was examined ...
... ADD208097. Title : Threshold Creep Behaviour of Discontinuous Aluminium and Aluminium Alloy Matrix Composites: An Overview. ...
... Accession Number : ADD111432. Title : STRAIN RATE EFFECT ON THE STRENGTH OF ALUMINIUM AND ALUMINIUM ALLOYS,. ...
... Accession Number : ADD108615. Title : ROLLING OF BAR, ROD, AND SECTION: ALUMINIUM AND ALUMINIUM ALLOY,. Corporate Author : ...
... Accession Number : ADD110092. Title : INTEGRAL COLOUR ANODIZING OF ALUMINIUM AND ALUMINIUM ALLOYS,. Corporate Author : ...
... Accession Number : ADD108609. Title : HOT ROLLING OF SHEET AND STRIP: ALUMINIUM AND ALUMINIUM ALLOYS,. Corporate Author : ...
... Title : CORROSION OF SIALON BY A LIQUID ALUMINIUM LITHIUM ALLOY AND FLUXES USED IN ALUMINIUM CASTING. Corporate Author : ...
... Accession Number : ADD108612. Title : COLD ROLLING OF SHEET AND STRIP: ALUMINIUM AND ALUMINIUM ALLOYS,. Corporate Author : ...
... Accession Number : ADD102550. Title : VACUUM HEATING HYDROGEN DETERMINATION IN ALUMINIUM AND ALUMINIUM ALLOYS,. ...
... Title : THE MICROSTRUCTURE AND MECHANICAL PROPERTIES OF ALUMINIUM RICH ALUMINIUM-COPPER-NICKEL ALLOYS. ...
... Title : THE INFLUENCE OF MICROSTRUCTURE ON THE ENERGY STORED IN DEFORMED ALUMINIUM AND ALUMINIUM ALLOYS,. ...
... Title : THE INFLUENCE OF ALKALINE PICKLING ON THE QUALITY OF BRAZING OF ALUMINIUM AND ALUMINIUM ALLOYS,. Corporate Author : ...
... Title : OPTIMISING THE CONDITIONS FOR THE CHEMICAL POLISHING OF ALUMINIUM AND ALUMINIUM ALLOY ELECTRODE WIRES,. ...
... OF AN AGE-HARDENING ALUMINIUM-SILVER ALLOY BY THE METHODS OF PHOTOELECTRON SPECTROSCOPY AND ELECTRON ...
... Accession Number : ADD104674. Title : EFFECTS OF HYDROGEN IN ALUMINIUM, MAGNESIUM, COPPER, AND THEIR ALLOYS,. ...
... Title : COLLOIDS AS CORROSION INHIBITORS FOR ALUMINIUM-COPPER ALLOY IN SODIUM HYDROXIDE,. Corporate Author : ...
... AN ALUMINIUM ALLOY USING THE ELECTRON EMISSION MICROSCOPE (EEM) AND THE TRANSMISSION ELECTRON MICROSCOPE (TEM),. ...
