Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/11169
標題: 以仿生法製備CaCO3/Mg,Al-hydrotalcite複合結構於鎂合金表面以提升其抗腐蝕性質之研究
A biomimetic approach to develop CaCO3/Mg,Al-hydrotalcite composite layer on Mg alloy to protect from corrosion
作者: 夏靜鈴
Hsia, Ching-Ling
關鍵字: Mg alloy;鎂合金;Corrosion;Calcium Carbonate;腐蝕;碳酸鈣
出版社: 材料工程學系所
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摘要: 
本實驗以仿生法製備CaCO3/Mg,Al-hydrotalcite複合結構於鎂合金AZ91D表面,探究其抗腐蝕性質之研究。將鎂合金AZ91D試片表層先形成Mg,Al-hydrotalcite(Mg6Al2(OH)16CO3‧4H2O),再將具Mg,Al-hydrotalcite層之鎂合金AZ91D試片以懸吊方式浸置在通有二氧化碳之氯化鈣(CaCl2)溶液中,一方面通入二氧化碳可提供形成碳酸鈣所需的碳酸根,另一方面藉由Mg,Al-hydrotalcite之陰離子交換性質,在鎂合金基材表面上形成緻密之碳酸鈣層。
由X-Ray繞射分析結果發現,在室溫下,Mg,Al-hydrotalcite層之鎂合金AZ91D試片浸置在氯化鈣溶液中所形成之碳酸鈣為Calcite相。由SEM之微結構觀察發現,所形成的Calcite相之碳酸鈣會隨著浸置時間的增加而增加。藉由橫截面觀察顯示碳酸鈣也夾雜在Mg,Al-hydrotalcite層中缺陷與裂縫中生長。
由電化學測試顯示,鎂合金AZ91D基材(無碳酸鈣層和Mg,Al-hydrotalcite之鎂合金試片)之腐蝕電位約在-1.45V/Ag/AgCl,腐蝕電流密度約為250μA/cm2;而CaCO3/Mg,Al-hydrotalcite複合結構於鎂合金AZ91D表面之腐蝕電位約在-1.35 V/Ag/AgCl,其腐蝕電流密度約在7.8μA/cm2,除了電化學測試外,也利用鹽水噴霧測試、模擬海水腐蝕試驗及伽凡尼腐蝕測試,其試驗結果顯示,以仿生法製備CaCO3/Mg,Al-hydrotalcite複合結構於鎂合金AZ91D表面,有助於提高鎂合金AZ91D試片的抗腐蝕能力。

This work discussed the corrosion resistance of the CaCO3/Mg,Al-hydrotalcite-coated Mg alloy. The CaCO3/Mg,Al-hydrotalcite composite layer was formed on Mg alloy (AZ91D) by means of biomimetic approach. At first the Mg,Al-hydrotalcite layer was developed on Mg alloy. Afterward, the thick and fast CaCO3 layer was coated on Mg sample, which take advantage of anion-exchangeability of Mg,Al-hydrotalcite by immersing the AZ91D sample in CaCl2 solution. In order to provide the needed CO32- for the formation of CaCO3, CO2 was add into the CaCl2 solution.
The X-Ray diffraction results revealed that a calcium carbonate (CaCO3) layer was coated on the Mg alloy sample surface in 0.1 M CaCl2 solution. The calcium carbonate was calcite phase. The scanning electron microscope (SEM) observation results found that the content of calcium carbonate (CaCO3) increased with increasing of times in 0.1 M CaCl2 solution. The cross-section of samples observation indicated that the calcium carbonate (CaCO3) also was formed on defect and crack areas of the Mg,Al-hydrotalcite layer.
The electrochemical polarization test results showed that the corrosion potential (Ecorr) and current density (Icorr) of the Mg alloy substrate were -1.45 V/Ag/AgCl and 250 μA/cm2. The Ecorr and Icorr of the sample with the CaCO3/Mg,Al-hydrotalcite composite layer were -1.35 V/Ag/AgCl and 7.8 μA/cm2. Several corrosion testing results presented that the sample with the CaCO3/Mg,Al-hydrotalcite composite layer had a much greater corrosion resistance than the sample with the Mg,Al-hydrotalcite layer and the Mg alloy substrate. Therefore the CaCO3/Mg,Al-hydrotalcite composite layer could form on Mg alloy (AZ91D) by biomimetic approach. The composite layer substantially improved the corrosion resistance of the Mg alloy substrate.
URI: http://hdl.handle.net/11455/11169
Appears in Collections:材料科學與工程學系

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