铁基非晶合金的电化学行为研究
关键词 铁基非晶合金、极化曲线、腐蚀行为、电化学交流阻抗、元素分布
毕业论文设计说明书外文摘要
Title Study on electrochemical behavior of Fe-based amorphous alloys
Abstract
Electrochemical polarization curves and electrochemical impedance spectroscopy（EIS） were used to study the corrosion behavior of Fe78Si9B13 ，Fe76Si9B10P5 and Fe76Si9B5P10 in boric-borate solution with pH7.4,pH8.4 or pH9.0. The reason of the different corrosion behavior of three kinds of sample in the same solution from the perspective of element distribution was analyzed by using XPS separately. The results of the polarization curve test show that: In alkaline solution, anodic polarization curves of the three kinds of samples show obvious and spontaneous characteristics of passivation, with lower passive current density and wider passivation region; In neutral solution, the three kinds of samples were directly dissolved at open-circuit potential without passivation. In addition，with the increasing of P , the corrosion resistance of the amorphous alloys was enhanced. The results of EIS show that: with the increasing of P, the impedance value of Fe-based amorphous alloys increased. From the data of elemental depth profile, it is know that the native layer of amorphous alloy was thinner and corrosion resistance of amorphous alloys was better, with the increase of P content.
Keywords Fe-based amorphous alloy , polarization curve , corrosion behavior, EIS
element distribution
目 次
1 引言 1
1.1 非晶合金概述 1
1.1.1 非晶合金的结构特征 1
1.1.2 非晶合金的晶化过程 2
1.2 非晶合金的制作方法 2
1.2.1 快速凝固 2
1.2.2 铜模铸造法 3
1.2.3 熔体水淬法 3
1.2.4 抑制形核法 3
1.2.5 粉末冶金技术 3
1.2.6 定向凝固铸造法 4
1.3 铁基非晶合金的特性 5
1.3 .1 铁基非晶合金的腐蚀机理 5
1.3.2 铁基非晶合金的热稳定性 6
1.4 X射线衍射原理 6
1.5 极化曲线的测量 8
1.6 电化学阻抗谱测量 8
1.7 X射线光电子能谱分析 9
2 实验方法 10
2.1 实验仪器 10
2.2 样品制作 10
2.3 X射线衍射实验 11