CORROSION STUDIES OF Al 7075 ALLOY REINFORCED WITH ZIRCON METAL MATRIX COMPOSITES

Submitted by : G. BANU PRAKASH
University: DRAVIDIAN UNIVERSITY
E-mail : banuprakashga@rediffmail.com
Supervisor's Name :
Year of award : 2012
Awards : 2012
Summary of Thesis

In the early stage of human civilization, man functioned like a biochemical machine deriving energy from the solar power through electrochemical reactions. Later, machines were fabricated to suit the needs of man and became a part of everyday life. A major obstacle, however, was noticed very soon – the machines started rusting. The study of rusting began with the realization that it affected the performance of machines and destroyed the metal fabrications. Measures were introduced to prevent the rusting process which initially involved coating of the metal surface with coal tar paints followed by galvanizing, tinning and electroplating....

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THESIS CHAPTER SCHEME
Chapter 1      Introduction
1.1 General introduction 1
1.2 Electrochemistry of corrosion 2
1.3 Thermodynamic aspects of corrosion 3
1.4 Kinetics of corrosion 3
1.5 Mechanism of corrosion 4
1.6 Classification of corrosion 5
1.7 Factors affecting corrosion 8
1.8 Expression of corrosion rate 12
1.9 The significance and economic overtones of corrosion 13
1.10 Corrosion control 15
1.11 Composites – Materials of future 19
1.12 Definition of composites 21
1.13 Behavior of composites 22
1.14 Types of composites 23
1.15 Metal matrix composites 25
1.16 Fabrication of MMCs 27
Chapter 2      Literature survey
2.1 State of art in MMCs 31
2.2 Corrosion of AMCs 35
2.3 Corrosion in MMCs 40
2.4 Stress corrosion in MMCs 43
2.5 Oxidation 48
2.6 Galvanic corrosion 50
2.7 Mechanical properties 53
2.8 Scope of the present investigation 56
Chapter 3      Materials and methods
3.1 Materials used 59
3.2 Composite preparation 61
3.3 Parameters for preparation of Al particulate composites 68
3.4 Micro-structural studies 71
3.5 Corrosion test procedures 77
Chapter 4      Results and discussion
4.1 Static corrosion 86
4.2 Open circuit potential studies 106
4.3 Galvanic corrosion 127
4.4 Stress corrosion studies 141
4.5 Mechanical properties 154
4.6 Salt spray test 165
Chapter 5      Conclusions
5.0 Conclusions 172
5.1 Suggestions for future work 174
References 175

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