The Corrosion Behavior of Amorphous / Nanocrystalline Alloys in Various Aggressive Aqueous Solutions

• Main Authors: Yun-Fang Wu, 吳昀芳
• Other Authors: Jiann-Kuo Wu
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/82393003458308433420

碩士 === 國立臺灣海洋大學 === 材料工程研究所 === 94 === Abstract The purpose of these studies is to investigate the corrosion behaviors of Pd-based, Fe-based, and Zr-based amorphous alloys and their crystalline states in different aqueous solutions at room temperature. The results show that the nanocrystalline states of these amorphous alloys can be obtained by suitable vacuum annealing. For Pd40Ni40P20 in various aqueous solutions, the corrosion resistance of its nanocrystalline state is better than that of its amorphous state due to its nanocrystalline state mainly consists of inert and noble phases. These inert and noble properties result in a higher corrosion resistance (lower corrosion rate) in nanocrystalline Pd40Ni40P20. For F40Ni38B18Mo4 in 3.5% NaCl solution, the corrosion resistance of its nanocrystalline state shows inferior to its amorphous state due to the local micro-galvanic cell action between different crystalline phase in matrix; whereas for Fe78B13Si9, Fe79B16Si5, and Fe81B13.5Si3.5C2 in 3.5% NaCl solution, the corrosion resistance of their amorphous states show inferior to their nanocrystalline states, and there is a tendency to increase the corrosion rate when increasing the Si content of their amorphous states. For Zr-Al-Ni based alloys in various aqueous solutions, the corrosion resistance of their amorphous state is better than that of their nanocrystalline state, and there is a tendency to increase the corrosion rate when increasing the Al content of their nanocrystalline states.