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Exfoliation

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Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003665
EISBN: 978-1-62708-182-5
... Abstract Exfoliation is a structure-dependent form of localized intergranular corrosion that follows grain boundaries in the rolling direction of wrought materials, particularly aluminum alloys. Highly cold-worked materials with elongated grain boundaries tend to be most affected. The article...
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Published: 15 June 2019
Fig. 15 Exfoliation corrosion of aluminum in an aircraft component More
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Published: 15 June 2019
Fig. 16 Exfoliation corrosion in an alloy 7178-T651 plate exposed to a seacoast environment. Cross section of the plate shows how exfoliation develops by corrosion along boundaries of thin, elongated grains. More
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Published: 15 June 2019
Fig. 17 Effect of temper on exfoliation resistance of an alloy 7075 extrusion exposed in a seacoast environment. Specimens were exposed for 4 years. (a) Specimen in the T6510 temper that developed exfoliation after only 5 months. (b) and (c) Specimens in the T76510 and T73510 tempers that were More
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Published: 01 January 2006
Fig. 2 Forms of corrosion in aircraft. (a) Exfoliation corrosion. (b) Microbiologically induced corrosion on fuel tank access door. (c) (d) Galvanic corrosion under aluminum-nickel bronze bushing More
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Published: 01 December 1998
Fig. 2 Exfoliation corrosion in an alloy 7178-T651 plate exposed to a seacoast environment. Cross section of the plate shows how exfoliation develops by corrosion along boundaries of thin, elongated grains. More
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Published: 01 August 2018
Fig. 52 Detection of galvanic exfoliation corrosion in aluminum wing skins. (a) Schematic showing source and growth of galvanic exfoliation corrosion. (b) Eddy current impedance responses for exfoliation corrosion around fastener holes in wing skins. (c) Schematic illustrating use of circle More
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Published: 01 January 2006
Fig. 11 Exfoliation corrosion of an aluminum T-45 cockpit kick plate angle resulting from water intrusion within cockpit areas. Courtesy of J. Benfer, Naval Air Depot, Jacksonville. See the article “U.S. Navy Aircraft Corrosion” in this Volume. More
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Published: 01 January 2006
Fig. 12 Forms of corrosion in aircraft. (a) Exfoliation corrosion. (b) Microbiologically induced corrosion on fuel tank access door. (c) Bushing assembly. (d) Galvanic corrosion under aluminum-nickel bronze bushing, seen with bushing removed. See the article “Corrosion in Commercial Aviation More
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Published: 01 January 2003
Fig. 1 Comparison of exfoliation of aluminum alloy 2124 (heat treated to be susceptible; EXCO ED rating) in various seacoast and industrial environments. Specimens were 13 mm ( 1 2 in.) plate. Source: Ref 2 More
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Published: 01 January 2003
Fig. 2 Examples of exfoliation rating EA (superficial). Specimens exhibit tiny blisters, thin slivers, flakes, or powder, with only slight separation of metal. Source: Ref 11 More
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Published: 01 January 2003
Fig. 3 Examples of exfoliation rating EB (moderate). Specimens show notable layering and penetration into the metal. Source: Ref 11 More
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Published: 01 January 2003
Fig. 4 Examples of exfoliation rating EC (severe). There is penetration to a considerable depth into the metal. Source: Ref 11 More
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Published: 01 January 2003
Fig. 5 Examples of exfoliation rating ED (very severe). Specimens appear similar to EC except for much greater penetration and loss of metal. Source: Ref 11 More
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Published: 01 January 2006
Fig. 11 Exfoliation corrosion resistance of alloy 7055-T765 (ASTM rating EB) is much superior to that for 7075-T65 (ASTM rating ED) More
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Published: 01 January 2006
Fig. 7 Firing platform exfoliation corrosion. Source: Ref 5 More
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Published: 01 January 2006
Fig. 8 Internal exfoliation corrosion of a barostatic release unit associated with an F-14 ejection seat. Courtesy of J. Benfer, Naval Air Depot—Jacksonville More
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Published: 01 January 2006
Fig. 9 Exfoliation corrosion of a integral fuel tank on a P-3 aircraft resulting from long-term exposure to moisture, salts, and fuel-system icing inhibitors. Courtesy of J. Benfer, Naval Air Depot—Jacksonville More
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Published: 01 January 2006
Fig. 18 Exfoliation corrosion of an aluminum T-45 cockpit kick plate angle resulting from water intrusion within cockpit areas. Courtesy of J. Benfer, Naval Air Depot—Jacksonville More
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Published: 01 January 2006
Fig. 3 Exfoliation corrosion around a fastener hole in a 7049-T73 aluminum alloy longeron. Radial arrows indicate measurements taken to assess damage. More