ABSTRACT
The expired Capifen drug was investigated for its synergistic effect for mild steel corrosion in acidic medium (0.5 M H2SO4) using the weight loss techniques. The results obtained shows that expired Capifen drug act as potential inhibitors for mild steel corrosion in H2SO4 solution. The inhibition efficiency was found to increase with increasing concentration of the expired drug while the corrosion rate decreased with increase in the concentrations of the expired capifen drug. The maximum inhibition efficiency was observed to be 88.4% at 400 ppm concentration. Hence, the expired drug could be harness and utilized as green corrosion inhibitor for corrosion prevention and control of metals and its products.
TABLE OF CONTENTS
Content Page
Title page – – – – – i
Certification – – – – – ii
Dedication – – – – – iii
Acknowledgements – – – – iv-v
Abstract – – – – – vi
Table of contents – – – – vii-viii
CHAPTER ONE
- INTRODUCTION – – – – 1
1.1 Background of the Study – – – 1-2
1.2 Aim and Objectives of the study – – 3
1.3 Scope and Limitation of the study – – 3
1.4 Definition of Terms – – – – 3-4
CHAPTER TWO
- Literature Review – – – – 5
- Drug Inhibitor – – – – – 5-9
- Corrosion Inhibitor – – – – 9-10
- Corrosion Inhibitor Mechanism – – – 10
- Drugs as corrosion inhibitors for mild
steel in acidic solution – – – – 10-15
- Green Inhibitors – – – – – 15
CHAPTER THREE
- MATERIALS AND METHOD – – 16
- Materials collection – – – – 16
- Equipment Used – – – – – 16
- Laboratory Preparation of the sample – – 16
- Laboratory Analysis – – – – 17-18
CHAPTER FOUR
- RESULTS AND DISCUSSION – – 19
- Results – – – – – – 19-24
- Discussion – – – – – – 24-26
CHAPTER FIVE
- CONCLUSION AND RECOMMENDATIONS 27
- Conclusion – – – – – – 27
- Recommendations – – – – – 28
References
CHAPTER ONE
- INTRODUCTION
- Background of the Study
The corrosion of metal is a fundamental academic and industrial concern that has received a considerable amount of attention. Acid solutions are generally used for the removal of rust and scale in several industrial processes.Organic Inhibitors were applied extensively to protect metals from corrosion in many aggressive acidic media (example, in the acid picking and cleaning processes of metals. (Al – Shafey, et al., 2011). Organic compounds containing N, S and O atoms were found to be good corrosion inhibitors of metals particularly for active metals Fe, Zn, Mg and Cu, etc. (Waness,et al., 2010). The effectiveness of these compounds as corrosion inhibitors has been interpreted in terms of their molecular structure, size, and molecular mass, heteroatom present and adsorptive tendencies. Under certain conditions, the electronicstructure of the organic inhibitors has a key influence on the corrosion inhibition efficiency to the metal. The inhibitors influence the kinetics of the electrochemical reactions which constitute the corrosion process and thereby modify the metal dissolution in acids. The existing data shows that most organic inhibitors acts as adsorption on the metal surface. Quite a number of studies have been carried out in determination of adsorptive of various compounds at the electrode/solution interface (Prabhu,et al., 2007). A large number of organic compounds were studied as corrosion inhibitors, unfortunately most of the organic inhibitors used are very expensive and health hazards. Their toxic properties limit their field of application. Thus, it remains an important object to find cost – effective and non – hazardous inhibitors for the protection of metals against corrosion. In this connection, the influences on non-toxic organic compounds and drugs on the corrosion of metals in acid media are investigated by several authors. (Abdel Hameed, 2013). In (2011), Abdel Hameed, was reported the use of expired ranitidine drugs as non – toxic corrosion inhibitor of mild steel in hydrochloric acid medium (Abdel Hameed, 2011).