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標題: Crystallization of a chemical conversion layer that forms on AZ91D magnesium alloy in carbonic acid
作者: Lin, Jun-Kai
Jeng, Kai-Li
Uan, Jun-Yen
關鍵字: A. Magnesium
A. Acid solutions
B. Polarization
B. IR spectroscopy
B. Raman spectroscopy
C. Amorphous structures
出版社: Elsevier Ltd.
摘要: This investigation studied the crystallization of a chemical conversion layer that formed on AZ91D Mg alloy in carbonic acid. The layer was an amorphous precursor to a crystalline Mg-Al layered double hydrotalcite, which improved the corrosion resistance of the alloy. The precursor must be treated with a strongly alkaline solution, causing the leaching out of amphoteric Al3+. The leaching step evidently caused crystallization from an amorphous precursor layer to a crystalline coating. Nuclear magnetic resonance analysis indicated that Al3+, which was originally randomly coordinated with surrounding OH− in the precursor, coordinated octahedrally with OH− groups in the crystalline conversion coating.
ISSN: 0010-938X
Appears in Collections:材料科學與工程學系



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