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Development of a stochastic metastable pit initiation model with transition to a stable pit state

Colwell, Alex M
http://rave.ohiolink.edu/etdc/view?acc_num=akron1462175258

Abstract Details

2016, Master of Science, University of Akron, Applied Mathematics.
A stochastic pit initiation model, using the kinetic Monte Carlo method to simulate localized corrosion, is developed and examined numerically. The model contains both metastable pitting and transition to stable pits components. The metastable pit model uses a non-homogeneous Poisson process with specified generation rates. The metastable pit generation rate takes into account material parameters, such as the pitting potential, and several environmental factors influencing metastable pit formation: chloride levels, sulfur dioxide levels, and time of wetness. The formation of a metastable pit causes a brief spike in current on the surface of the metal. Stable pits are formed when overlapping current spikes from multiple metastable pits reach a required threshold current. Each threshold current is specific to the metal being observed and is derived from the Galvele criterion, that the product of the current density and the pit depth must exceed a critical value. The model determines the chronological formation of metastable pits and their transition from metastable to stable growth in order to track the accumulation and formation of metastable pit and stable pit densities. The model is benched marked against literature field data collected on AA1050 and laboratory data collected on AA7075.
Nao Mimoto (Advisor)
Curtis Clemons (Advisor)
Kevin Kreider (Advisor)
102 p.
Applied Mathematics
Corrosion, Pitting, Metastable pit initiation, Stable pit transistion

Recommended Citations

Citations

  • Colwell, A. M. (2016). Development of a stochastic metastable pit initiation model with transition to a stable pit state [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1462175258

    APA Style (7th edition)

  • Colwell, Alex. Development of a stochastic metastable pit initiation model with transition to a stable pit state. 2016. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1462175258.

    MLA Style (8th edition)

  • Colwell, Alex. "Development of a stochastic metastable pit initiation model with transition to a stable pit state." Master's thesis, University of Akron, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=akron1462175258

    Chicago Manual of Style (17th edition)

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This open access ETD is published by University of Akron and OhioLINK.