Key Features:

No of Pages" 43
No of Chapters: 5

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Abstract:

Studies on corrosion inhibition potential of Indigo Carmine extract on mild steel in an acidic medium were carried out using weight loss and electrochemical techniques. It was observed that the Indigo Carmine extract retarded the dissolution of mild steel in the acidic medium. The corrosion rate decrease with an increase in concentration. The CR decrease from 37.59mm/yr to 27.50mm/yr in presence of the inhibitor. The CR also increases with the increase in temperature up to 60oC. The increase in CR with temperature suggests both physical and chemical adsorption of the Indigo Carmine (IC) on the mild steel. Potentiodynamic polarization measurements showed a reduction in the corrosion rate of the mild steel surface. The potentiodynamic studies shows a corrosion inhibition of 26.8% by the extract. Indigo Carmine was therefore found effective in inhibiting the corrosion of mild steel in acid medium.

Table of Content:

TITLE PAGE

DECLARATION

CERTIFICATION

ACKNOWLEDGEMENT

ABSTRACT

TABLE OF CONTENTS

LIST OF FIGURES

LIST OF TABLES

CHAPTER ONE

1.0 INTRODUCTION

1.1 Corrosion

1.2 Causes and Economic effects of corrosion

1.3 Mechanism of corrosion inhibition

1.4 Corrosion Inhibition

1.3 Mild steel

1.4 AIMS AND OBJECTIVES

CHAPTER TWO

2.0 LITERATURE REVIEW

CHAPTER THREE

3.0 MATERIALS AND METHODS

3.1 Apparatus and Reagents

3.2 Preparation of Extract

3.3 Preparation of Mild Steel

3.4 Weight Loss Experiment

3.5 Temperature Dependence Measurements

3.6 Electrochemical Measurement

CHAPTER FOUR

4.0 RESULTS AND DISCUSSIONS

4.1 Effect of Inhibitor Concentration on Corrosion Rate

4.2 Effect of Temperature

4.3 Adsorption Studies

4.4 Electrochemical Measurement

CHAPTER FIVE

5.0 CONCLUSIONS AND RECOMMENDATION

5.1 CONCLUSIONS

5.2 RECOMMENDATION

REFERENCES

APPENDIX A

APPENDIX B

APPENDIX C


LIST OF FIGURES
FIGURE TITLE PAGE

1.1 Oil pipeline Corrosion - - - - - - 3

1.2 Gas pipeline corrosion - - - - - - 3

1.3 Inner view of corroded pipeline - - - - - 4

1.4 Corrosion in heat exchanger - - - - - - 5

1.5 Corrosion in heat exchanger - - - - - - 6

1.6 Corrosion in boilers. - - - - - - - 6

1.7 Stainless steel sheet before and after pickling - - - 9

4.1 Variation of corrosion rate (gcm-2h-1) with concentration of inhibitor - 19

4.2 Arrhenius plot for mild steel corrosion in Blank - - - 21

4.3 Arrhenius plot for mild steel corrosion in 10ppm Indigo Carmine - 21

4.4 Transition state plot for mild steel corrosion in Blank - - 23

4.5 Transition state plot for mild steel corrosion in 10ppm of Indigo Carmine - 23


LIST OF TABLES
TABLE TITLE PAGE

4.1 Arrhenius Parameters for the Inhibition of the Corrosion of Mild Steel 22

4.2 Value for thermodynamic Parameters calculated from Transition state

adsorption plot - - - - - - - 24

4.3 Table of values obtained from linear polarization measurement - 24