Effects of nonhalide anions on the stress corrosion cracking behaviour of alloy 7475 in the tempers T651 and T7351

Braun, Reinhold

doi:10.1002/1521-4176(200009)51:9<607::aid-maco607>3.0.co;2-8

Cited by 5 publications

(2 citation statements)

References 13 publications

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“…For alloy 7475-T651, a short transverse threshold stress below 100 MPa was determined in alternate immersion tests, whereas SCC failure was not observed for specimens being permanently immersed in 3.5% NaCl solution at an applied stress of 100 MPa. However, chloride solutions containing nonhalide anions promoted stress corrosion cracking with aluminium alloys under permanent immersion conditions [16,17]. The occurrence of environment-induced cracking was probably associated with an inhibiting effect of the anions added, preventing crack blunting due to passivation of the crack walls.…”

Section: Introductionmentioning

confidence: 99%

“…A similar dependence of the SCC behaviour on immersion conditions in sodium chloride solutions was found for high strength 2xxx and 7xxx series aluminium alloys [15,16]. Tensile specimens of 2024-T351 plate material, being highly sensitive to stress corrosion cracking when alternately immersed, did not fail under permanent immersion at applied stresses up to 300 MPa.…”

Section: Introductionmentioning

confidence: 99%

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Stress corrosion cracking behaviour of Al‐Li alloy 8090‐T8171 plate exposed to various synthetic environments

Braun¹

2004

Materials & Corrosion

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The stress corrosion cracking (SCC) behaviour of 8090‐T8171 plate material was investigated in short transverse direction performing constant load tests and constant extension rate tests under permanent immersion conditions. At an applied stress of 100 MPa, smooth round tensile specimens were exposed to synthetic environments containing chlorides and various nonhalide anions. Environment‐induced cracking was not observed in aqueous solutions of 0.6 M NaCl, LiCl, NH4Cl, or MgCl2. In 0.6 M NaCl solutions containing 0.06 M Na2SO4 or Na3PO4, the SCC behaviour of 8090‐T8171 plate was similar to that observed in pure 0.6 M NaCl solution. Sodium chloride solutions with additions of nitrate, hydrogen carbonate, or carbonate promoted stress corrosion cracking. Threshold stresses below 100 MPa were obtained from constant load tests using the latter environments. When sodium sulfite or sodium hydrogen phosphate was added, values being 100 MPa or slightly higher were determined. Lithium and ammonium present as cations in mixed salt electrolytes accelerated SCC failure. Lithium chloride solutions containing nitrate, hydrogen carbonate, carbonate, or sulfite were highly conducive to stress corrosion cracking. Very low SCC resistance was found for alloy 8090‐T8171 exposed to synthetic environments with additions of ammonium salts. Constant extension rate tests were carried out using notched tensile specimens. Displacement rates were in the range 2 × 10−6 − 2 × 10−5 mms−1. Aqueous 0.6 M NaCl solutions with additions of 0.06 M NH4HCO3, (NH4)2SO4, or Li2CO3 promoted environment‐induced cracking with 8090‐T8171 plate, as indicated by severe degradation of notch strength. The constant extension rate testing technique did not indicate SCC susceptibility using sodium chloride solutions containing sodium sulfate or lithium sulfate. For specimens exposed to substitute ocean water a slight degradation of notch strength was found at the lowest displacement rate applied.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Stress corrosion cracking behaviour of Al‐Li alloy 8090‐T8171 plate exposed to various synthetic environments

Braun¹

2004

Materials & Corrosion

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Environmentally assisted cracking of aluminium alloys

Braun

2007

Materialwissenschaft Werkst

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Dedicated to Prof. Wolfgang Bunk on the occasion of his 80 th birthdayA short review of the stress corrosion cracking (SCC) behaviour of aluminium alloys is given. Mechanisms of environmentally assisted cracking are outlined. For aluminium alloys, in which stress corrosion cracks propagate predominantly along grain boundaries, anodic dissolution and hydrogen embrittlement have been proposed. Transgranular stress corrosion cracking occurring at severe loading conditions has found particular interest concerning localised corrosion-deformation interactions. Accelerated test methods for assessing the SCC behaviour are described, including the slow strain rate testing technique and the breaking load method. Results of recent studies on environmentally assisted cracking of aluminium alloys are summarised. Most of the work published in the last two decades has been on aluminium-lithium based alloys and improved high strength Al-Zn-Mg-Cu alloys in corrosion resistant retrogressed and re-aged tempers.Keywords: aluminium alloys, stress corrosion cracking, anodic dissolution, hydrogen embrittlement, testing methods

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Environmentally Assisted Cracking of Alloy 7050-T7451 Exposed to Aqueous Chloride Solutions

Braun

2016

Metall Mater Trans A

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Effects of nonhalide anions on the stress corrosion cracking behaviour of alloy 7475 in the tempers T651 and T7351

Cited by 5 publications

References 13 publications

Stress corrosion cracking behaviour of Al‐Li alloy 8090‐T8171 plate exposed to various synthetic environments

Stress corrosion cracking behaviour of Al‐Li alloy 8090‐T8171 plate exposed to various synthetic environments

Environmentally assisted cracking of aluminium alloys

Environmentally Assisted Cracking of Alloy 7050-T7451 Exposed to Aqueous Chloride Solutions

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