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EFFECT OF PHYLLANTHUS AMARUS EXTRACT ON CORROSION OF ALUMINUM IN AMONIUM HYDROXIDE SOLUTION
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Table of contents
CHAPTER ONE 1
1.1 Introduction 1
1.1.1 Meaning of Corrosion 3
1.1.2 Different Theories of Corrosion 4
1.1.3 Principles of Corrosion 7
1.1.4 Forms of Corrosion 7
1.1.5 Methods of Preventing Corrosion 9
1.1.6 Corrosion Inhibitors 10
1.1.7 Chemistry of Corrosion 11
1.1.8 Factors that Control the Corrosion Rate 13
1.1.9 The Consequences of Corrosion 15
1.2 Aim and Objectives of the Study 16
CHAPTER TWO: LITERATURE REVIEW 17
2.1 Previous Studies on Corrosion 17
2.2 Description of Phyllanthus Amarus 19
2.2 Description of Phyllanthus Amarus 19
2.2.1 Phytochemical Constituents of Phyllanthus amarus 21
2.2.2 Habit and Habitat 23
2.2.3 Traditional Uses 23
2.3 Aluminum 25
2.3.1 Physical Properties of Aluminum 26
2.3.2 Aluminum Chemistry (Al) 26
2.3.3 Chemical Properties of Aluminum 27
CHAPTER THREE: MATERIALS AND METHODS 29
3.1 Chemical Used 29
3.2 Preparation of Coupons 30
3.3 Preparation of Solution 31
3.4 Preparation of Inhibited Solution 32
3.5 Experimental Procedure 32
CHAPTER FOUR: RESULT AND DISCUSSION 34
4.1 Discussion 47
CHAPTER FIVE 48
Conclusion 48
References 49
LIST OF TABLES
Table Title Page
4.1 Corrosion Parameter of Aluminum after immersion in 0.5M
of ammonium hydroxide at room temperature in the absence
of inhibitor at various time interval 34
4.2 Corrosion parameter of aluminum after immersion in 0.5M of
ammonium hydroxide and 20g, 30g, 40g, 50g, 60 of Phyllanthus
amarus extract inhibitor of various time intervals. 35
Abstract
This study examine the effect of phyllanthus amarus extract on corrosion of Aluminum in Ammonium hydroxide using gravimetric (weight-loss) techniques. The aluminum composition of different dimension was prepared for the experiment by polishing with various grades of 60, 80, 120, 200, 800, 1000 and 1200 of emery paper. FTIR analysis was tested to determine the OH and functional group. The study revealed that weight loss decreases with increasing concentration of the leave extract which indicates that phyllanthus amarus extract inhibits the corrosion of aluminum in NH4OH. It was concluded that phytochemical compounds in phyllanthus amarus leave extract plays a vital role in the inhibition action of aluminum.
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