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論文標題
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Characterization and Improvement in Corrosion Performance of a Hot-Chamber Diecast
Mg Alloy Thin Plate by the Removal of Interdendritic Phases at Die Chill Layer
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內容摘要
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This work presents results concerning the effect of the die chill layer on the corrosion
performance of a hot-chamber diecast AZ91D thin plate, with particular attention
to the role of interdendritic phases (primary (Al17Mg12) and surrounding phase).
The primary phase in the die chill layer was removed by Ar+ etching, but the other
main constituent phases remained on surface of the sample. Although previous researchers
have attributed intense galvanic corrosion to the cathodic phase (primary ), this
work demonstrates that the removal of the primary phase from the diecast sample
surface did not improve the corrosion performance of the sample. Transmission electron
microscopic examinations were performed to elucidate the microstructure near the
die chill surface, especially focusing on the Mg phase that surrounds the primary
phase. The surrounding Mg phase (known as Al-rich or eutectic ) actually
did not contain a high concentration of aluminum solid solution. Instead, the “Al-rich
” comprised fine Al12Mg17 particles and Al-Mn like particles (smaller than 0.5
m) that were distributed in a low Al-containing Mg matrix (~ 4 wt% Al). Such fine
cathodic particles....
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期刊名稱
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Metallurgical and Materials Transactions, 39A (2008) 703
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主要作者
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汪俊延，李青霏、余秉隆
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全文連結
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http://www.mse.nchu.edu.tw/paper/paper401/11661_2007_9420_OnlinePDF.pdf
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