The effects of applied stress and sensitization on the passive film stability of AL-MG alloys

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dc.contributor.advisorBrewer, Luke N.
dc.contributor.authorFleming, Jennifer S.
dc.contributor.departmentMechanical and Aerospace Engineering (MAE)
dc.contributor.secondreaderFarmer, Joseph C.
dc.dateJun-13
dc.date.accessioned2013-08-01T16:51:35Z
dc.date.available2013-08-01T16:51:35Z
dc.date.issued2013-06
dc.description.abstractThis thesis evaluates effects of stress on the corrosion behavior for the aluminum magnesium alloy AA5083 in a comprehensive and systematic manner. This study used cyclic polarization and electrochemical impedance spectroscopy to study passive film stability of AA5083-H116, and sought to understand how applied and residual tensile and compressive stresses impact the passive layer film and the materials electrochemistry. Sample plates of AA5083 were sensitized to different levels to promote the formation of intergranular phase (Al3Mg2). The corrosion response of these sensitized plates was measured after laser peening and during the application of an elastic tensile stress. The corrosion response of these materials was sensitive to the application of a tensile stress. As sensitization increased, the material surface became more electrochemically active, but the stability of the passive oxide film also increased. The passive film stability was reduced by the applied tensile stress while the degree of passivity was slightly increased. No clear correlation between laser peening and surface corrosion chemistry was observed.en_US
dc.description.distributionstatementApproved for public release; distribution is unlimited.
dc.description.serviceLieutenant, United States Navyen_US
dc.description.urihttp://archive.org/details/theeffectsofppli1094534663
dc.identifier.urihttps://hdl.handle.net/10945/34663
dc.publisherMonterey, California: Naval Postgraduate Schoolen_US
dc.rightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.en_US
dc.subject.authorAluminum-magnesium alloyen_US
dc.subject.authorAA5083-H116en_US
dc.subject.authorcorrosionen_US
dc.subject.authorcyclic polarizationen_US
dc.subject.authorelectrical impedance spectroscopyen_US
dc.subject.authorEISen_US
dc.subject.authorsensitizationen_US
dc.subject.authorlaser peeningen_US
dc.subject.authorfour-point bend apparatusen_US
dc.subject.author1 molar NaClen_US
dc.subject.authorelectrochemistryen_US
dc.subject.authorU.S. Navyen_US
dc.subject.authorDoDen_US
dc.subject.authorAluminum Alloyen_US
dc.subject.authorelectrochemical analysisen_US
dc.subject.authorcurrent densityen_US
dc.subject.authorelectrochemical electrodesen_US
dc.titleThe effects of applied stress and sensitization on the passive film stability of AL-MG alloysen_US
dspace.entity.typePublication
etd.thesisdegree.disciplineMechanical Engineeringen_US
etd.thesisdegree.levelMastersen_US
etd.thesisdegree.nameMaster of Scienceen_US
etd.thesisdegree.nameMaster of Science in Mechanical Engineeringen_US
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