ABSTRACT
The application of expired drugs as corrosion inhibitors provides a cost effective and environmentally benign alternative to otherwise tedious and costly disposal/degradation process. In this context, we herein investigate the use of expired atorvastatin (EA) for corrosion inhibition of mild steel in 1 M HCl solution using weight loss,electrochemical impedance spectroscopy (EIS), and potentiodynamic polarization (Tafel) methods. Fresh atorvastatin(FA) drug was also used for above studies for Comparison purpose to understand whether there is anysignificant difference between the inhibition efficiency of the two after the expiration date of the drug. EIS analysisshows an increase in polarization resistance due to theadsorbed inhibitor molecules on metal surface. Potentiodynamic polarization indicates that both the EA and FA act as mixed-type inhibitors but predominantly behave ascathodic inhibitors. The adsorption of EA and FA on mild steel surface follows the Langmuir adsorption isotherm. SEM shows a smoother surface of mild steel in the presence of FA and EA drug in acidic solution. Both the freshdrug and its expired counterpart showed almost similar results in all the studies, thereby verifying the validity ofthe expired atorvastatin drug as a novel and efficient corrosion inhibitor for mild steel.
TABLE OF CONTENTS
Title page
Certification
Dedication
Acknowledgements
Abstract
Table of contents
CHAPTER ONE
- INTRODUCTION
- Background of the Study
- Aim and Objectives of the study
- Scope and Limitation of the study
- Definition of Terms
CHAPTER TWO
- Literature Review
- Corrosion Inhibitors for metals.
- Characteristic of Green Inhibitors
- Expired drugs as green Inhibitors.
CHAPTER THREE
- Materials and Method
- Materials and Reagents used
- Sample Collection
- Method
- Sample Presentation
CHAPTER FOUR
- Result and Discussion
- Result
- Discussion
CHAPTER FIVE
- Conclusion and Recommendation
- Conclusion
- Recommendation
References
