Time-Lapse Video Techniques in the Corrosion Testing of Aluminum Alloys PDF Download
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Author: NJH Holroyd
Publisher:
ISBN:
Category : Alternate immersion
Languages : en
Pages : 27
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Book Description
This paper describes the use of time-lapse video techniques for in situ observation during controlled and free corrosion of high-strength Al-Zn-Mg-Cu alloys 7075 and 7150 and two Al-Zn binary alloys. Direct observation of corroding 7075 in various tempers shows that, as a precursor to stable pit formation, a deformable gelatinous layer of corrosion product develops. Gas is evolved at the metal/hydrated oxide interface, which distorts the gel layer at potentials below those expected for pitting. During stress corrosion cracking of 7150 T6, time-lapse video images confirm that initial drying after total immersion of 0.6M NaCl solution leads to an acceleration in the apparent rate of crack growth from 5 x 10-7 m/s to 9 x 10-6 m/s. This rate is sustained for only a few minutes but could help explain the aggressive nature of alternate immersion testing.
Author: NJH Holroyd
Publisher:
ISBN:
Category : Alternate immersion
Languages : en
Pages : 27
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Book Description
This paper describes the use of time-lapse video techniques for in situ observation during controlled and free corrosion of high-strength Al-Zn-Mg-Cu alloys 7075 and 7150 and two Al-Zn binary alloys. Direct observation of corroding 7075 in various tempers shows that, as a precursor to stable pit formation, a deformable gelatinous layer of corrosion product develops. Gas is evolved at the metal/hydrated oxide interface, which distorts the gel layer at potentials below those expected for pitting. During stress corrosion cracking of 7150 T6, time-lapse video images confirm that initial drying after total immersion of 0.6M NaCl solution leads to an acceleration in the apparent rate of crack growth from 5 x 10-7 m/s to 9 x 10-6 m/s. This rate is sustained for only a few minutes but could help explain the aggressive nature of alternate immersion testing.
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: 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: N Eswara Prasad
Publisher: Butterworth-Heinemann
ISBN: 0124016790
Category : Technology & Engineering
Languages : en
Pages : 596
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Book Description
Because lithium is the least dense elemental metal, materials scientists and engineers have been working for decades to develop a commercially viable aluminum-lithium (Al-Li) alloy that would be even lighter and stiffer than other aluminum alloys. The first two generations of Al-Li alloys tended to suffer from several problems, including poor ductility and fracture toughness; unreliable properties, fatigue and fracture resistance; and unreliable corrosion resistance. Now, new third generation Al-Li alloys with significantly reduced lithium content and other improvements are promising a revival for Al-Li applications in modern aircraft and aerospace vehicles. Over the last few years, these newer Al-Li alloys have attracted increasing global interest for widespread applications in the aerospace industry largely because of soaring fuel costs and the development of a new generation of civil and military aircraft. This contributed book, featuring many of the top researchers in the field, is the first up-to-date international reference for Al-Li material research, alloy development, structural design and aerospace systems engineering. Provides a complete treatment of the new generation of low-density AL-Li alloys, including microstructure, mechanical behavoir, processing and applications Covers the history of earlier generation AL-Li alloys, their basic problems, why they were never widely used, and why the new third generation Al-Li alloys could eventually replace not only traditional aluminum alloys but more expensive composite materials Contains two full chapters devoted to applications in the aircraft and aerospace fields, where the lighter, stronger Al-Li alloys mean better performing, more fuel-efficient aircraft
Author: Russell H. Jones
Publisher: CRC Press
ISBN: 0824746015
Category : Technology & Engineering
Languages : en
Pages : 499
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Book Description
This invaluable reference provides a comprehensive overview of corrosion and environmental effects on metals, intermetallics, glossy metals, ceramics and composites of metals, and ceramics and polymer materials. It surveys numerous options for various applications involving environments and guidance in materials selection and substitution. Exploring a wide range of environments, including aqueous and high-temperature surroundings, Environmental Effects on Engineered Materials examines specific material-environmental interactions; corrosion rates and material limitations; preventive measurements against corrosion; utilization of older materials in recent applications; the use of new materials for existing equipment; and more.
Author: Russell H. Jones
Publisher: Society for Mining Metallurgy & Exploration
ISBN:
Category : Science
Languages : en
Pages : 792
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Book Description
This collection of papers from the 2001 TMS Annual Meeting held in New Orleans includes papers from the symposium on the chemistry and electrochemistry of corrosion and stress corrosion cracking. It covers topics such as chemistry differences between crack initiation and propagation.
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 938
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Book Description
Author:
Publisher:
ISBN:
Category : Metallurgy
Languages : en
Pages : 764
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Book Description
Author:
Publisher:
ISBN:
Category : Engineering
Languages : en
Pages : 2264
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Book Description
Since its creation in 1884, Engineering Index has covered virtually every major engineering innovation from around the world. It serves as the historical record of virtually every major engineering innovation of the 20th century. Recent content is a vital resource for current awareness, new production information, technological forecasting and competitive intelligence. The world?s most comprehensive interdisciplinary engineering database, Engineering Index contains over 10.7 million records. Each year, over 500,000 new abstracts are added from over 5,000 scholarly journals, trade magazines, and conference proceedings. Coverage spans over 175 engineering disciplines from over 80 countries. Updated weekly.
Author: EH. Gillespie
Publisher:
ISBN:
Category : Alloys
Languages : en
Pages : 12
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Book Description
The use of the slow strain-rate stress corrosion technique for testing aluminum alloys is discussed. This technique is compared to the more frequently used statically loaded, alternate immersion test technique used for evaluating the susceptibility of aluminum alloys to stress corrosion cracking (SCC). Aluminum alloys (2124 and 7075), each in three conditions with differing susceptibilities to SCC, were tested by both the statically loaded alternate immersion test and the slow strain-rate technique. The results of these tests are compared and the slow strain-rate test is shown to be a viable, rapid technique for determining the SCC susceptibility of aluminum alloys.
