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“Influence of Si, Sb and Sr Additions on the Microstructure ...

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Chapter 4: Results <str<strong>on</strong>g>and</str<strong>on</strong>g> Discussi<strong>on</strong><br />

Figure 4.73: SEM photograph <str<strong>on</strong>g>of</str<strong>on</strong>g> immersi<strong>on</strong> tested AZ9l alloy (a) 2 h immersed<br />

surface showing pitting type corrosi<strong>on</strong> in <strong>the</strong> a-Mg matrix<br />

(b) 100 h immersed surface showing unaffected massive <str<strong>on</strong>g>and</str<strong>on</strong>g><br />

disc<strong>on</strong>tinuous Mg11Al1; precipitates<br />

Figure 4.74: SEM photograph <str<strong>on</strong>g>of</str<strong>on</strong>g> diflerent alloys immersi<strong>on</strong> tested for l00h<br />

showing stable intermetallics (a) AZ9l+0.5% <str<strong>on</strong>g>Si</str<strong>on</strong>g> alloy<br />

(b) AZ9l+0.5%<str<strong>on</strong>g>Sb</str<strong>on</strong>g> alloy<br />

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