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http://hdl.handle.net/11375/18389
Title: | THE EFFECT OF H2SO4 SURFACE PRE-TREATMENT ON THE STRESS CORROSION CRACKING OF MAGNESIUM ALLOY AZ31B |
Authors: | Wilson, Brycklin |
Advisor: | Kish, Joseph McDermid, Joseph |
Department: | Materials Science and Engineering |
Keywords: | Magnesium;Stress Corrosion Cracking |
Publication Date: | Nov-2015 |
Abstract: | The stress corrosion cracking (SCC) behaviour of Mg alloy AZ31B was investigated with respect to surface condition. Salt fog U-bend testing was used to identify changes in SCC as a result of surface conditioning pre-treatments. Six surface conditions were investigated: as-received, mechanically-polished, sulphuric acid (H2SO4)-cleaned, mechanically-polished then H2SO4-cleaned, aged H2SO4-cleaned, and acetic acid (C2H4O2)-cleaned. Results showed that the rate of SCC was accelerated and the SCC mode was intergranular for all surface conditioning treatments involving H2SO4-cleaning. It was found that the accelerated intergranular SCC was a result of three contributing factors: a low pH, the presence of aggressive ions, and a porous film which allowed direct contact between the metal surface and the electrolyte. Characterization of the surfaces using potentiodynamic polarization and cross-sectional images of sample surfaces showed that in the absence of one of these three contributing factors intergranular SCC would not occur. |
URI: | http://hdl.handle.net/11375/18389 |
Appears in Collections: | Open Access Dissertations and Theses |
Files in This Item:
File | Description | Size | Format | |
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Wilson_Brycklin_M_201509_MASc.pdf | MASc Thesis | 5.41 MB | Adobe PDF | View/Open |
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