목차

Abstract…………………………………………………………...….…….ⅰ
Table of Contents…………………………………………………..………ⅱ
List of Tables ……………………………………………….…....….….... ⅴ
List of Figures ………………………………………………….….………ⅵ
1. Introduction.…….…….…….…….……………………..….……...1
1.1. Motivation of research...............................................................1
1.2. Background information............................................................2
1.2.1. Anodic oxidation..............................................................2
1.2.2. Feature of aluminum oxide.............................................6
1.2.3. Feature of aluminum die-casting alloy...........................8
2. Experimental & Analysis.…………...............................................10
2.1. Experimental section……………....……….….…….……......10
2.1.1. Pre-treatment of aluminum die-casting alloy …..…….10
2.1.2. Anodization of aluminum die-casting alloy with
electrolyte containing metal oxide anion……..……….10
2.2. Analysis…………………………………………….....….….…14
2.2.1. Scanning Electron Microscope (SEM)…….…….….…14
2.2.2. Potentiostat……………..……………………….………14
2.2.3. Microvickers Hardness Tester…...……..……...……....15
2.2.4. X-ray Photoelectron Spectroscopy (XPS)……………..15
3. Results & Discussion………………………………………………16
3.1. Results of anodized oxide layer with different concentration of metal oxide anion…………………………………...….......16
3.1.1. Aluminum oxide anion………………………………..16
3.1.2. Other metal oxide anion………………………………21
3.1.3. EDX mapping of anodized oxide layer…………….…23
3.2. Effect of anodization time……………………………………25
3.3. Tafel plot analysis…………………………………………….27
3.4. Microvickers hardness test results…………………………..31
3.4.1. Aluminum oxide anion………………………………..31
3.4.2. Other metal oxide anion………………………………33
3.5. Binding energy analysis of metal oxide anion………………38
3.6. Mechanism of self-healing phenomena……………………...42
4. Conclusion…………………………………………………………44
5. References………………………………………………………….45
Acknowledgement…………………………………………………49