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Author: Joseph R. Davis
Publisher: ASM International
ISBN: 9781615032389
Category : Technology & Engineering
Languages : en
Pages : 338
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Book Description
Author: Joseph R. Davis
Publisher: ASM International
ISBN: 9781615032389
Category : Technology & Engineering
Languages : en
Pages : 338
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Book Description
Author: SJ. Ketcham
Publisher:
ISBN:
Category : Accelerated tests
Languages : en
Pages : 14
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Book Description
This paper is a general review of the subject of exfoliation corrosion of aluminum alloys summarizing both published and unpublished work. Present thinking on mechanisms is presented. Susceptible alloys and the corrosive environments in which exfoliation occurs are discussed, as well as effect of varying degrees of exfoliation on static and dynamic fatigue strength of 7075-T6 and on life of an actual aircraft structure.
Author: Christian Vargel
Publisher: Elsevier
ISBN: 0080472362
Category : Technology & Engineering
Languages : en
Pages : 659
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Book Description
Corrosion of Aluminium highlights the practical and general aspects of the corrosion of aluminium alloys with many illustrations and references. In addition to that, the first chapter allows the reader who is not very familiar with aluminium to understand the metallurgical, chemical and physical features of the aluminium alloys. The author Christian Vargel, has adopted a practitioner approach, based on the expertise and experience gained from a 40 year career in aluminium corrosion This approach is most suitable for assessing the corrosion resistance of aluminium- an assessment which is one of the main conditions for the development of many uses of aluminium in transport, construction, power transmission etc. 600 bibliographic references provide a comprehensive guide to over 100 years of related study Providing practical applications to the reader across many industries Accessible to both the beginner and the expert
Author: Vinod S. Agarwala
Publisher: ASTM International
ISBN: 0803114354
Category : Aluminum alloys
Languages : en
Pages : 227
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Book Description
Evaluates the usefulness of the current standards on exfoliation and corrosion testing of aluminum alloys and their applicability to new requirements and advanced alloys. The 13 papers, from an international symposium in San Francisco, May 1990, discuss whether the existing standards should be revis
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Author: Xinyan Zhao
Publisher:
ISBN:
Category : Aluminum alloys
Languages : en
Pages :
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Book Description
Abstract: The objective of this study was to quantitatively study localized corrosion, especially exfoliation corrosion (EFC) of high strength aluminum alloys and to investigate the mechanism of exfoliation corrosion with a focus on the effects of alloy temper, microstructure, relative humidity (RH) and mechanical stress. A new technique, Exfoliation of Slices in Humidity (ESH), was developed for the determination of exfoliation corrosion (EFC) susceptibility and quantification of EFC kinetics. This technique involves in exposing properly oriented and unconstrained samples to high humidity following an electrochemical pretreatment. The EFC kinetics was determined by measuring the width of the central unattacked region of the samples. The ESH results show the capability of the ESH test to discriminate between plates of varying susceptibility and to determine EFC rates quantitatively. Optical microscopy and analytical TEM were used to investigate the effects of microstructure and local chemistry at grain boundary on EFC susceptibility. Alloys with more elongated grain shape are more susceptible to EFC and a high Zn content in grain boundary precipitate free zone relates to a high susceptibility. The effects of RH, temper and applied stress on EFC kinetics of AA7178 were investigated by ESH tests. The critical RH for EFC propagation in AA7178 was found to be about 56% and the EFC kinetics increased with RH. ESH tests provide a quantitative description of the temper effect on EFC kinetics. The effects of applied compressive and tensile stresses on EFC kinetics were studied using a four-point bending jig. Compression accelerated EFC significantly and tension reduced kinetics. An equation describing the effects of RH, stress and time on EFC kinetics was developed based on the ESH results using Eyring model. In situ X-ray radiography was used to characterize intergranular and exfoliation corrosion in high strength Al alloys. The samples were either exposed to sodium chloride solution (NaCl) at a controlled potential or to high humidity after an electrochemical pretreatment in NaCl solution. In situ X-ray radiography of intergranular corrosion attack provides a wide range of IGC kinetics including the fastest growing sites. This method is a good approach for visualizing the EFC process.
Author: C. Groot
Publisher:
ISBN:
Category : Aluminum
Languages : en
Pages : 76
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Book Description
Author: DO. Sprolws
Publisher:
ISBN:
Category : Accelerated tests
Languages : en
Pages : 15
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Book Description
Atmospheric exposures of 18 to 39 months have been completed at seacoast and inland industrial locations to determine the resistance to exfoliation corrosion of specially heat-treated test panels of high-strength aluminum alloys. Two seacoast locations, one at Point Judith, Rhode Island, and another at Daytona Beach, Florida, were selected, together with an industrial location near Chicago, Illinois, to represent the relatively severe atmospheric conditions to which aluminum alloy aircraft structures are subjected in service. The purpose of these tests was to demonstrate the relationship of the performances in the accelerated exfoliation corrosion tests previously evaluated by this task group with those in relatively aggressive natural environments.
Author: N.J.H. Holroyd
Publisher: Elsevier Inc. Chapters
ISBN: 0128068523
Category : Technology & Engineering
Languages : en
Pages : 53
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Book Description
Industrial interest in wrought heat-treatable aluminium-lithium (Al–Li) based alloys dates back to around 1919 in Germany. However the exploitation of these alloys has historically been limited by their mechanical property anisotropy and concerns over their localized corrosion resistance and temperature stability. Recently, in the last ten years, alloy and process development has resulted in alloy compositions and thermomechanical treatments that potentially can overcome these issues. To put these developments in perspective we have reviewed the corrosion characteristics of first, second and third generation alloys with an emphasis on localized corrosion (intergranular and exfoliation) and stress corrosion cracking (SCC). Intergranular corrosion susceptibility of Al–Li–Cu and Al–Li–Cu–Mg alloys increases with copper content, and the depth of attack increases with ageing, i.e. UAPA~30 mm) further analysis of corrosion test results is required.
Author: Christian Vargel
Publisher: Elsevier
ISBN: 9780080444956
Category : Law
Languages : en
Pages : 670
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Book Description
Corrosion of Aluminium highlights the practical and general aspects of the corrosion of aluminium alloys with many illustrations and references. In addition to that, the first chapter allows the reader who is not very familiar with aluminium to understand the metallurgical, chemical and physical features of the aluminium alloys. The author Christian Vargel, has adopted a practitioner approach, based on the expertise and experience gained from a 40 year career in aluminium corrosion This approach is most suitable for assessing the corrosion resistance of aluminium- an assessment which is one of the main conditions for the development of many uses of aluminium in transport, construction, power transmission etc. 600 bibliographic references provide a comprehensive guide to over 100 years of related study Providing practical applications to the reader across many industries Accessible to both the beginner and the expert
