Accession Number ADA580760
Title Role of Stress in the Corrosion Cracking of Aluminum Alloys.
Publication Date Mar 2013
Media Count 81p
Personal Author B. E. Scott
Abstract This work examines the effect of stress on the rate of sensitization, the rate of pitting corrosion and the rate of crack nucleation of aluminum alloy 5083-H116 aluminum. Stress corrosion cracking in aluminum superstructures of Naval vessels is a multibillion-dollar maintenance problem, which requires more scientific understanding to better predict and mitigate. To investigate the role of applied stress on these corrosion-related processes, rolled plate of AA5083 was placed under tensile stress through bending while being subject to elevated temperature and salt spray. Nitric acid mass loss tests quantified the amount of sensitization as a function of stress level. Optical micrographs were used to determine the rate of pitting corrosion and crack nucleation while under applied tensile stress. The effect of applied, elastic stress on the degree of sensitization was inconclusive. Applied stress did increase the rate of localized corrosion, in terms of both pitting and intergranular corrosion. Moreover, the orientation of the plate with respect to the applied tensile stress, strongly affected the type and amount of localized corrosion observed. When the tensile stress was applied across the rolling direction, more localized corrosion occurred and intergranular corrosion dominant over pitting.
Keywords Aluminum
Bending
Cracks
Naval vessels
Stress corrosion
Tensile stress
Theses


 
Source Agency Non Paid ADAS
NTIS Subject Category 71N - Nonferrous Metals & Alloys
71G - Corrosion & Corrosion Inhibition
47A - Marine Engineering
Corporate Author Naval Postgraduate School, Monterey, CA.
Document Type Thesis
Title Note Master's thesis.
NTIS Issue Number 1324
Contract Number N/A

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