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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
|關鍵字:||A. Magnesium;A. Acid solutions;B. Polarization;B. IR spectroscopy;B. Raman spectroscopy;C. Amorphous structures||出版社:||Elsevier Ltd.||Project:||Corrosion Science, Volume 53, Issue 11, Page(s) 3832-3839.||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.
|Appears in Collections:||材料科學與工程學系|
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