Al-Ce-TM非晶合金的腐蚀性能研究

发布时间：2018-10-26 16:53

【摘要】：近年来，非晶态材料作为一种新型材料已经渐渐进入了人们的生活。非晶态材料之所以受到人们的青睐，，是缘于它优良的物理化学性能，其中很重要的一个特性就是它的良好的抗腐蚀性能。在我国，腐蚀每年都会导致巨大的损失，所以寻找抗腐蚀性能优良的材料是一项重要使命。铝基非晶合金具有优良的抗腐蚀性能，但是由于铝基非晶合金出现较晚，所以目前人们对它的研究相对较少，对添加稀土和过渡元素的铝基非晶合金的研究也就更少。本文所研究的材料为铝基非晶稀土合金（Al-RE-TM），名义成分为Al88Ce8TM4（TM=Cu、Ni、Co、Fe、Mn、Cr、Ti）。非晶合金试样是由单辊旋淬法制得，是2~4mm宽，约300μm厚的条带。通过XRD、TEM对合金试样进行的微观组织及显微结构进行观察，来证明7种合金的显微结构。之后分别在pH为3、5、10的0.6M NaCl溶液中对合金的开路电位、交流阻抗和极化曲线进行测试。实验结果表明：通过X射线衍射分析发现，7种合金的衍射图谱均具有较宽的漫散射峰，说明制得的合金均是非晶合金，透射电子显微镜进一步观察也证明了这一结果。非晶合金在pH为3、5、10的0.6M NaCl溶液中的腐蚀结果如下：通过对腐蚀电位、腐蚀电流、点蚀电位、极化电阻和电荷转移电阻的综合比较，可以发现过渡元素对非晶合金的抗腐蚀性能的影响为：在pH为3的溶液中的抗腐蚀性能的增强从强到弱依次是：Cu、Ti、Mn、Cr、Ni、Fe、Co；在pH为5的溶液中的抗腐蚀性能的增强从强到弱依次是：Cr、Ti、Ni、Co、Fe、Cu、Mn；在pH为10的溶液中的抗腐蚀性能的增强从强到弱依次是：Mn、Fe、Cr、Co、Ti、Ni、Cu。之后分别比较每种合金在3种溶液中的抗腐蚀性能发现，Al88Ce8TM4（Cu、Ni、Co、Cr、Ti）合金在pH为5的0.6M NaCl溶液中抗腐蚀性良好；Al88Ce8TM4（Fe、Mn）合金在pH为10的0.6M NaCl溶液中抗腐蚀性良好。
[Abstract]:In recent years, amorphous materials as a new material has gradually entered people's lives. The reason why amorphous materials are favored is due to their excellent physical and chemical properties. One of the most important properties is their good corrosion resistance. In our country, corrosion causes huge losses every year, so it is an important mission to find materials with good corrosion resistance. Al-based amorphous alloys have excellent corrosion resistance, but due to the late appearance of Al-based amorphous alloys, there are relatively few studies on them, and less on aluminum-based amorphous alloys with rare earths and transition elements. The material studied in this paper is aluminum-based amorphous rare earth alloy (Al-RE-TM) with nominal composition of Al88Ce8TM4 (TM=Cu,Ni,Co,Fe,Mn,Cr,Ti). The amorphous alloy sample was prepared by single roll spinning quenching. It is a 2~4mm wide strip with a thickness of about 300 渭 m. The microstructure and microstructure of the alloy samples were observed by XRD,TEM to prove the microstructure of 7 kinds of alloys. Then the open circuit potential, AC impedance and polarization curves of the alloy were measured in 0.6 M NaCl solution with pH of 3? 5? The experimental results show that the diffraction patterns of the seven alloys have wide diffuse scattering peaks through X-ray diffraction analysis, indicating that the alloys are amorphous alloys, which is also proved by transmission electron microscope (TEM). The corrosion results of amorphous alloys in 0.6 M NaCl solution with pH of 3? 5? 10 are as follows: the corrosion potential, corrosion current, pitting potential, polarization resistance and charge transfer resistance are compared. It can be found that the effect of transition elements on the corrosion resistance of amorphous alloys is as follows: the enhancement of corrosion resistance in solution with pH = 3 is in order of strong to weak: Cu,Ti,Mn,Cr,Ni,Fe,Co; The enhancement of corrosion resistance in a solution with pH of 5 is in order of strength to weakness: Cr,Ti,Ni,Co,Fe,Cu,Mn; The enhancement of corrosion resistance in solutions with pH of 10 is in order of strong to weak: Mn,Fe,Cr,Co,Ti,Ni,Cu. After comparing the corrosion resistance of each alloy in three solutions, it was found that Al88Ce8TM4 (Cu,Ni,Co,Cr,Ti) alloy had good corrosion resistance in 0.6 M NaCl solution with pH 5. Al88Ce8TM4 (Fe,Mn) alloy has good corrosion resistance in 0.6 M NaCl solution with pH 10.
【学位授予单位】：内蒙古科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG139.8

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