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INTERGRANULAR CORROSION OF 5086-H34 ALUMINUM
Title
INTERGRANULAR CORROSION OF 5086-H34 ALUMINUM.
Creator
DUNN, MICHAEL JOSEPH., Florida Atlantic University, Hartt, William H.
Abstract/Description
Experiments were carried out in order to better characterize the intergranular corrosion process of 5086-H34 aluminum in sea water. Specimens were exposed at a constant potential in the range -0.75VSCE
Show moreExperiments were carried out in order to better characterize the intergranular corrosion process of 5086-H34 aluminum in sea water. Specimens were exposed at a constant potential in the range -0.75VSCE < corr < -0.83 Volts Saturated Calomel Electrode (VSCE). As a result, it was found that for a potential noble to -0.79VSCE intergranular corrosion indeed occurs. Under the same conditions 5052-H34 shows no intergranular attack. Since the major difference between these alloys is beta phase percent and distribution, this implies a minimum of this phase is required for intergranular corrosion to occur. Measurements of pH within simulated occluded cells were made in an attempt to obtain reasons for the observed -0.79VSCE threshold. The results of this did not point to any particular course which would explain this potential.
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Date Issued
1975
PURL
http://purl.flvc.org/fcla/dt/13752, http://purl.flvc.org/fau/fd/FADT13752
Subject Headings
Aluminum--Corrosion
Format
Document (PDF)
STUDY OF STRESS CORROSION CRACKING IN 7079-T651 ALUMINUM
Title
A STUDY OF STRESS CORROSION CRACKING IN 7079-T651 ALUMINUM.
Creator
FINNEGAN, JOHN EDMUND., Florida Atlantic University, Hartt, William H.
Abstract/Description
This study investigated the stress corrosion cracking behavior of aluminum alloy 7079 - T651 in two corrosive environments, sea water and a 3% NaCl-distilled water solution. Self stressing, double cantilever beam specimens were employed; and these were stressed at various levels, exposed in one of the two test environments and crack extension monitored as a function of time. Equations for the plane strain stress intensity factor (K1) were compared and evaluated, with respect to stress...
Show moreThis study investigated the stress corrosion cracking behavior of aluminum alloy 7079 - T651 in two corrosive environments, sea water and a 3% NaCl-distilled water solution. Self stressing, double cantilever beam specimens were employed; and these were stressed at various levels, exposed in one of the two test environments and crack extension monitored as a function of time. Equations for the plane strain stress intensity factor (K1) were compared and evaluated, with respect to stress intensities calculated from compliance measurements. Results suggest that stress intensity is not the only important variable controlling crack growth rate and a time dependent cracking mechanism may govern a portion of crack growth.
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Date Issued
1975
PURL
http://purl.flvc.org/fcla/dt/13730
Subject Headings
Aluminum--Corrosion, Stress corrosion
Format
Document (PDF)
STRESS CORROSION CRACKING OF 7079-T651 ALUMINUM IN RESPONSE TO A CONSTANT STRESS INTENSITY
Title
STRESS CORROSION CRACKING OF 7079-T651 ALUMINUM IN RESPONSE TO A CONSTANT STRESS INTENSITY.
Creator
SCOTT, DARWIN HAROLD, II., Florida Atlantic University, Hartt, William H., College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description
Double cantilever beam specimens of 7079-T651 aluminum were subjected to low constant stress intensities in a sea water environment to determine the stress corrosion cracking response. In addition to a constant stress intensity some specimens were subjected to controlled, constant potentials. Despite the fact that all tests were in Region I of the crack growth rate-stress intensity curve, where the former has been projected to be very dependent upon the latter, a unique relationship between...
Show moreDouble cantilever beam specimens of 7079-T651 aluminum were subjected to low constant stress intensities in a sea water environment to determine the stress corrosion cracking response. In addition to a constant stress intensity some specimens were subjected to controlled, constant potentials. Despite the fact that all tests were in Region I of the crack growth rate-stress intensity curve, where the former has been projected to be very dependent upon the latter, a unique relationship between stress intensity and crack growth rate was not always indicated. Therefore, some variable other than stress intensity is assumed to control crack growth, particularly for the first several hundred hours of exposure. The observed behavior is discussed in terms of accepted theories of stress corrosion cracking in high strength aluminum alloys, including electrochemical dissolution and hydrogen embrittlement.
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Date Issued
1977
PURL
http://purl.flvc.org/fcla/dt/13878
Subject Headings
Stress corrosion, Aluminum--Corrosion
Format
Document (PDF)