Mg合金的水热处理对其形貌及腐蚀性能的影响
毕业论文关键词 AZ31 镁合金 水热法 形貌 润湿性 耐腐蚀性
Title Morphology and corrosion resistance of magnesium alloy after hydrothermal treatment
Abstract In this paper, we used AZ31 magnesium alloy as experimental subjects, using the only-water hydrothermal treatment for its surface, using digital cameras, scanning electron microscopy, X-ray diffraction and energy dispersive to study the surface morphology changes of AZ31 magnesium alloy after immersed in ultrapure water at 120℃ for different time. Wetting angles were measured by contact angle measuring instrument and Electrochemical Workstation measuring AZ31 magnesium alloy in polarization curves and AC impedance in 0.144mol NaCl and 0.2mol PBS solution after hydrothermal treatment, and then determine the changes of its corrosion resistance. The main results are as follow: The results showed that after the hydrothermal treatment at different times, the surface of AZ31 magnesium alloy can exhibit different colors, such as green, red, brass and other colors. XPS results showed that the surface compositions of AZ31 magnesium alloy after hydrothermal process were mainly Mg(OH)2. The wettability results showed that after 4h hydrothermal treatment, its contact angle of AZ31 magnesium alloy can reach 94.75°, and showed the hydrophobicity. The results of polarization curves showed that since the existence of Mg(OH)2 ,PO43-and Cl- , such corrosion of magnesium alloy surface became complicated. AC impedance results indicated that hydrothermal treatment of magnesium alloy AZ31 can improve its corrosion resistance to some extent.
Keywords AZ31 magnesium alloy hydrothermal method morphology wettability corrosion resistance
目次
1引言1
1.1镁合金的研究进展1
1.1.1镁合金的优点1
1.1.2镁合金的缺点1
1.1.3镁合金的应用2
1.1.4AZ31镁合金3
1.2镁合金的腐蚀特性及防护3
1.2.1镁合金的腐蚀3
1.2.2镁合金的防腐4
1.3镁合金表面微纳结构的构建4
1.3.1刻蚀法4
1.3.2微弧氧化法5
1.3.3电镀法5
1.3.4溶胶凝胶法5
1.3.5水热法5
1.3.6其他方法6
2实验7
2.1实验材料及试剂7
2.2实验主要仪器和设备7
2.3实验方法——只用水的水热法7
2.4实验步骤8
2.5表征方法8
2.5.1形貌表征——SEM8
2.5.2成分检测——XRD、EDS9
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