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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