Zr48Cu36Al8Ag8Six(x = 0.00~1.00)鋯基金屬玻璃在硫酸與氯鹽環境中之腐蝕行為; Corrosion behavior of Zr48Cu36Al8Ag8Six(x = 0.00~1.00) bulk metallic glasses (BMGs) in sulfuric acid and sodium chloride solutions

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题名:	Zr48Cu36Al8Ag8Six(x = 0.00~1.00)鋯基金屬玻璃在硫酸與氯鹽環境中之腐蝕行為;Corrosion behavior of Zr48Cu36Al8Ag8Six(x = 0.00~1.00) bulk metallic glasses (BMGs) in sulfuric acid and sodium chloride solutions
作者:	洪婉毓;Hung,Wan-yu
贡献者:	機械工程學系
关键词:	金屬玻璃;矽;腐蝕;氯化鈉;硫酸;Metallic glasses;Zr-Cu-Al-Ag-Si;corrosion;NaCl;H2SO4
日期:	2013-06-27
上传时间:	2013-07-10 12:08:09 (UTC+8)
出版者:	國立中央大學
摘要:	本論文在探討Zr48Cu36Al8Ag8Six鋯基金屬玻璃中矽(Si)含量在0.00, 0.25, 0.50, 0.75, 1.00 at.%等範圍內對其腐蝕行為之影響，腐蝕溶液分為氯化鈉(NaCl)和硫酸(H2SO4)兩種環境，研究方法包含浸泡量測、直流電化學極化法(線性極化、Tafel極化、動態極化)與交流電化學阻抗頻譜法等來研究其腐蝕行為。腐蝕測試前後採用熱示差分析儀(DSC)熱性質量測材料，藉以判別玻璃形成能力(GFA)與材料腐蝕行為之關係，此外用掃描式電子顯微鏡(SEM)、原子力顯微鏡(AFM)進行表面形貌觀察，電子微探儀(EPMA)以分析腐蝕後元素分佈及X光光電子能譜儀(XPS)進行腐蝕生成物的探討。綜合浸泡量測與電化學量測實驗結果顯示：含0.25 at.%矽之鋯基金屬玻璃抗蝕性最高，且在硫酸(H2SO4)環境中顯示出活性-鈍化轉變區，表面鈍化膜藉由XPS分析得知：含0.25 at.%矽之鋯基金屬玻璃，其表面由ZrO2與SiO2組成之峰值面積最大，此兩種保護性氧化物的貢獻，使其擁有最佳抗蝕性。 Corrosion behavior of Zr48Cu36Al8Ag8Six (x=0.00, 0.25, 0.50, 0.75, 1.00 at.%) bulk metallic glasses (BMGs) in sodium chloride and sulfuric acid solutions were investigated by immersion test, direct current (dc) polarization techniques (Tafel polarization, linear polarization resistance, potentiodynamic polarization) and electrochemical impedance spectroscopy. Instrumental analyses such as DSC, SEM, AFM were carried out prior to and post the corrosion test to find the correlation between the corrosion behaviour and structure of the BMG； EPMA and XPS analyses provided the relationship between the corrosion and composition of the specimens. According to the results from immersion test and electrochemical studies, we concluded that the specimens of BMG containing 0.25 at.%-Si revealed the best corrosion resistance. There was an occurrence of active - passive transition on the potentiodynamic polarization curve for the specimens immersed in sulfuric acid. The presence of passive film on the specimens was confirmed in terms of XPS analyses. Dominant contribution of the passive film indicated by the strongest peaks of ZrO2 and SiO2 led to the best corrosion resistance of the specimens with 0.25 at.%Si.
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