论文总字数：23139字

摘 要

铝基牺牲阳极具有理论电容大、驱动电位适中、无污染、材料成本低且资源丰富等特点，成为了新型扬极材料的研究热点。但是由于铝的性质活泼，易氧化形成致密的Al₂O₃薄膜，从而阻止合金表面的活化溶解，致使铝基牺牲阳极材料的电流效率较低，为了改变这一现状透光石改善合金腐蚀形貌以增长寿命，还需要进一步进行相关的研究。

本文基于对Al-Zn合金和Al-Zn-Sn合金了解的基础上，通过添加Sn元素，研究Sn含量对合金电化学性能以及腐蚀形貌的影响，同时考察热处理对合金电化学性能的影响。结合恒电流法、极化曲线和交流阻抗谱等测试方法考察Sn添加量和固溶处理工艺对阳极材料表面溶解状况和电流效率的影响，同时通过金相分析合金的金相组织变化特征。

结果表明：添加Sn元素可以改善Al-Zn合金的电化学性能，使合金的开路电位负移，工作电位稳定性加强，当Sn添加量达到0.15%时,综合电化学性能最好，继续增加加入量，电流效率反而降低。所以Sn添加量0.15%最佳。

固溶处理可以通过提高合金组织的均匀性并且增大未溶解颗粒的结合力，大幅度提高Al-6Zn-0.15Sn的电流效率，电化学综合性能得到大的提高。除此之外，在490℃时保温4h不仅可以使合金的腐蚀更加均匀，还没有出现腐蚀产物的粘附现象，综上固溶处理工艺为在490℃下保温4h最优。

关键词：牺牲阳极；铝基阳极；锡；固溶处理

Investigation on Microstructure and Electrochemical Performance of

Al-Zn-Sn Series Anode Materials

ABSTRACT

Aluminum base anodes materials have been extensively researched for their advantages of high theoretical capacities, moderately operating potential abundance and accessibility.As a result,Al-Base alloy has been a new kind of sacrificial anode material which has been developed. But on the surface of Al-Base sacrificial anode, there normally forms a passive oxide film, due to pure aluminum's active nature and easy to be oxidated. The oxide film will prevent the sacrificial anode from normally dissolving and decrease the current efficiency. To solve this problem,We need further related research.

Several kinds of Al-Zn-Sn system and Al-Zn system sacrificial anodes are cast.By adding Sn elements to learn influence of Sn content on the electrochemical characteristics and corrosion morphology. We also studied heat treatment on the electrochemical characteristics of alloy at the same time. Combined with constant current, polarization curve and electrochemical impedance to study the influence of Sn and solution treatment on the surface the anode material and current efficiency,In addition to it,We analysis microstructure of alloy through Metallographic.

Conclusions as follows: .The electrochemical performances of Al-Zn alloy sacrificial anodes correlates with the content of Sn. When the content of Sn reaches 0.15%, the electrochemical performances are the best; and the current efficiency and actual capacity decreases with the increasing content of Sn.

Heat treatment can improve the uniformity of the alloy structure and refine the grain thereby increasing the grain boundary area.Greatly improve current efficiency of Al-6Zn-0.15Sn,Electrochemical synthesis performance greatly improved.Thus,When slloy was Insulated in 490℃ for four hour,corrosion of the alloy had been more uniform,Moreover,corrosion products had not sticking.In short,Optimal heat treatment process for 4h at 490 ℃ is best.

Key word: sacrificial anode，Al-Based alloy，Sn，Solution Treatment

目 录

摘 要 I

ABSTRACT II

第一章 绪 论 1

1.1 引言 1

1.2 牺牲阳极保护法 1

1.2.1 牺牲阳极的工作原理 1

1.2.2 牺牲阳极材料的性能要求 2

1.2.3 牺牲阳极的应用 3

1.2.4 牺牲阳极的分类 3

1.3铝基牺牲阳极的活化机理研究 4

1.4 影响Al-Zn-Sn系阳极的因素及相关研究结果 5

1.4.1 成分因素 5

1.4.2 热处理 5

1.5 本论文的研究方法和研究思路 5

第二章 实验方法 7

2.1 实验仪器及主要原料 7

2.1.1 实验仪器及规格 7

2.1.2 主要原料 8

2.2 AI-Zn-Sn合金制备 9

2.2.1 合金元素配比方案 9

2.2.2 实验前材料准备 9

2.2.3 熔炼工艺 10

2.3 铝基阳极的热处理 10

2.4 电化学性能测试 11

2.4.1 试样准备 11

2.4.2 实验装置 12

2.4.3 电流效率计算 13

2.5极化曲线和电化学阻抗谱测试 14

2.5.1 实验装置 14

2.5.2 测试方法 15

2.6 阳极合金的金相分析 15

第三章 实验分析 17

3.1 Sn含量对Al-6Zn-Sn合金的电化学性能影响 17

3.1.1 电化学性能 17

3.1.2 金相观察 19

3.1.3 极化曲线 20

3.1.4 交流阻抗 21

3.2 热处理对Al-6Zn-0.15Sn合金的电化学性能的影响 22

3.2.1 电化学性能 22

3.2.2 金相观察 25

3.2.3 极化曲线 27

3.2.4 交流阻抗 28

第四章 结论 30

参考文献 31

致谢 33

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