... of time. The examined specimens were single layer epoxies on aluminum alloy (AA 2024-T3) substrates. Artificial weathering ...

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...

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 ...

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 ...

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

... materials and material types: aa 2024-t3 materials related terms: corrosion fatigue, crack growth rate, fatigue crack growth, grain size, intergranular ...

... 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. ...

... aa 2024-t3, aa 7075-t6 materials related terms: anodic polarization, chromate coatings, chromium addition, copper addition, corrosion protection ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 procedures of current ...

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 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 ...

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 ...

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 ...

... 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

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 ...

... PERFORMANCE OF ALUMINUM ALLOYS 1100, 3003 ... DIFFERENCES IN ALLOY PERFORMANCE. ... OF THE ALUMINUM ALLOYS IS OBSERVED ...

... ALUMINUM ALLOY WELDMENTS UNDER THE GUIDANCE OF THE ALUMINUM ALLOYS COMMITTEE OF THE WELDING RESEARCH COUNCIL ...

... Accession Number : AD0815691. Title : WELDING OF ALUMINUM AND ALUMINUM ALLOYS,. Corporate Author : BATTELLE ...

... ALLOYS), (*ANODES, ALUMINUM ALLOYS), (*ELECTROCHEMISTRY, ALUMINUM ALLOYS), SEA WATER, MERCURY ALLOYS, ZINC ALLOYS ...

... Title : Development of Cast Aluminum Alloys for Elevated ... to develop an aluminum alloy for service at ... of the various alloys subsequently cooled to ...

... COPPER ALLOYS, MANGANESE ALLOYS, ALUMINUM ALLOYS, TIN ALLOYS, INDIUM ALLOYS, BISMUTH ALLOYS, GERMANIUM ALLOYS ...

... LOADING, MECHANICAL PROPERTIES, ALUMINUM ALLOYS, MOLYBDENUM ALLOYS, VANADIUM ALLOYS, TIN ALLOYS, STABILITY. ...

... ALUMINUM ALLOYS, MAGNESIUM ALLOYS, TITANIUM ALLOYS, COPPER ALLOYS, BERYLLIUM ALLOYS, STRUCTURAL COMPONENTS ...

... ALLOYS, *CORROSION RESISTANCE), (*STRESS CORROSION, ALUMINUM ALLOYS), SILVER ALLOYS, ZINC ALLOYS, MAGNESIUM ALLOYS. ...