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Experimental Considerations in Predicting Damage during Galvanic Corrosion

HAQUE, MD ZIAUL
http://orcid.org/0000-0002-8729-6777
http://rave.ohiolink.edu/etdc/view?acc_num=akron1438960415

Abstract Details

2015, Master of Science in Engineering, University of Akron, Chemical Engineering.
Commercially available finite element software based on a solution of La Place's equation offers the opportunity for investigators to predict galvanic corrosion rates for engineering parts with complex geometries. In these routines, potentiodynamic polarization data are used to determine the current density at a given mesh point based on the solution for the potential distribution. However, stochastic processes, such as local initiation, can quickly complicate these models as they lead to deviations from the input polarization data. In this work, we discussed these experimental considerations for the couple between copper and aluminum in 0.1M NaCl solution. The initiation of galvanic corrosion in chloride containing environment is localized and, more importantly, the current density at the initiation site can be orders of magnitude greater than the current density one would predict from the polarization curve for Al at the couple potential. We discussed the parameters such as temperature and pH of the solution, solution flow condition (stagnant vs. well mixed) and chemical composition of the cathode material that may influence the polarization data. This is important for modeling as the data is used as boundary condition. Then we presented experimental data including measurements of damage evolution, form of damage geometry and local current density using several different techniques namely immersion techniques, scanning vibrating electrode techniques and pencil electrode techniques. These results were compared to model predictions. An adjusted Tafel relationship was established to be used in the model. Finally, galvanic corrosion mechanism, corrosion geometry, localized corrosion current density and environmental and electrolyte properties that influence the corrosion mechanism were recommended to be considered for galvanic corrosion model development.
Scott Lillard, Professor (Advisor)
Hongbo Cong, Assistant Professor (Committee Member)
Qixin Zhou, Assistant Professor (Committee Member)
78 p.
Materials Science
Galvanic Corrosion, Corrosion Modeling, Corrosion geometry, Localized corrosion

Recommended Citations

Citations

  • HAQUE, M. Z. (2015). Experimental Considerations in Predicting Damage during Galvanic Corrosion [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1438960415

    APA Style (7th edition)

  • HAQUE, MD ZIAUL. Experimental Considerations in Predicting Damage during Galvanic Corrosion. 2015. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1438960415.

    MLA Style (8th edition)

  • HAQUE, MD ZIAUL. "Experimental Considerations in Predicting Damage during Galvanic Corrosion." Master's thesis, University of Akron, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=akron1438960415

    Chicago Manual of Style (17th edition)

akron1438960415
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© 2015, all rights reserved.
This open access ETD is published by University of Akron and OhioLINK.