– The Effect of L-Methionine on Corrosion Inhibition of Mild Steel in 2m Hcl Using Weight Loss Method –
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ABSTRACT
The inhibitive action of L- Methionine against the corrosion of mild steel in 2M HCl was investigated using weight loss method at 303K, 313K, 323K and 333K.
Results obtained showed that L-Methionine is a good inhibitor for mild steel in 2M HCl solution with maximum inhibition efficiency of 93.08% in 5.0 x 10-4M at 323K.
The result also reveals that increase in temperature increases corrosion rate and decreases efficiency; while increase in concentration of the inhibitor decreases corrosion rate and decreases efficiency
TABLE OF CONTENTS
Title page i
Cover page ii
Certification iii
Dedication iv
Acknowledgements v
Abstract vi
Table of Contents vii
List of Tables xi
List of Figures xii
CHAPTER ONE: INTRODUCTION
1.1 Definition of corrosion 1
1.2 Chemistry of corrosion 1
1.3 Classification of corrosion 2
1.3.1 Dry or chemical corrosion 3
1.3.2 Wet or electrochemical corrosion 3
1.4 Types of Corrosion 3
1.4.1 General attack corrosion 4
1.4.2 Localized corrosion 4
1.4.2.1 Pitting 4
1.4.2.2 Crevice corrosion 4
1.4.2.3 Filiform corrosion 5
1.4.3 Galvanic corrosion 5
1.4.4 Environmental cracking 5
1.4.5 Flood-Assisted corrosion 6
1.4.6 Intergranular corrosion 6
1.4.7 De-alloying 6
1.4.8 Fretting corrosion 6
1.4.9 High temperature corrosion 7
1.5 Factors affecting corrosion process 7
1.5.1 Nature of metal 7
1.5.2 Nature of corrosion products 7
1.5.3 pH of the medium 8
1.5.4 Temperature 8
1.5.5 Electrolyte concentration 8
1.5.6 Amount of dissolved oxygen 8
1.6 Methods of reducing corrosion 8
1.6.1 Coating the metal 8
1.6.2 Alloying the metal 9
1.6.3 Conditioning the medium 9
1.6.4 Electrochemical control 9
1.7 Corrosion inhibitors 10
1.7.1 Classification of corrosion inhibitor 10
1.7.1.1 Anodic inhibitors 10
1.7.1.2 Cathodic inhibitors 11
1.7.1.3 Adsorption type corrosion inhibitor 12
1.7.1.4 Mixed inhibitors 12
1.7.1.5 Ohmic or filming inhibitors 12
1.7.1.6 Precipitation inhibitors 12
1.7.2 L-methionine 13
1.8 Aim and objective of the project 13
CHAPTER TWO: LITERATURE REVIEW
CHAPTER THREE: MATERIALS AND METHODS
3.1 Collection of materials 19
3.1.1 Mild steel 19
3.1.2 Inhibitors 19
3.1.3 Reagents 19
3.2 Equipment 19
3.3 Weight loss method 20
3.3.1 Corrosion rate 20
3.3.2 Inhibition efficiency 20
3.4 Preparation of 2M solution of HCl 20
CHAPTER FOUR: RESULTS AND DISCUSSION
4.1 Corrosion of mild steel in 2M HCl solution containing L-methionine at 303K 22
4.2 Corrosion of mild steel in 2M HCl solution containing L-methionine at 313K 25
4.3 Corrosion of mild steel in 2M HCl solution containing L-methionine at 323K 27
4.4 Corrosion of mild steel in 2M HCl solution containing L-methionine at 333K 29
4.5 Weight loss measurement, corrosion rates and inhibition efficiency. 31
CHAPTER FIVE: SUMMARY, CONCLUSION AND RECOMMENDATIONS
5.1 Summary 33
5.2 Conclusion 33
5.3 Recommendations 33
REFERENCES. 34
INTRODUCTION
The corrosion of metals at the solid/liquid interface by corrodents such as acid and base is a major problem encountered in numerous industrial processes (Kadhum et al., 2014).
Millions of dollars are lost yearly because of corrosion; much of this loss is due to corrosion of iron and steel although many other metals may corrode as well as the problem with iron.
Due to this harmful effect, corrosion is an undesirable phenomenon that ought to be prevented (Buchwershaija, 2009).
Mild steel is one of the major construction materials which is extensively used in chemical and allied industries for the handling of acids, alkalis, salts and other solutions.
Definition of Corrosion
Corrosion is the deterioration or loss of material and its critical properties due to chemical, electrochemical and other reactions of the exposed material surface with the environment (Fontana, 1986).
Corrosion is a natural process that reduces the binding energy in metals with the end result involving a metal being oxidized as the bulk metal loses one or more electrons (Chinwko et al; 2014).
Corrosion of metal differs from that of other materials in that it involves charge transfer (ions and electrons) and in most cases conducting solutions, that is electrolytes (Khamael and Mabrouk, 2009).
The environment that corrodes a metal could be air, water, acid, base, soil and others.
REFERENCES
Albana, J., Alketa, L. and Efrosini, K. (2014). The inhibition effect of methionine on mild steel in acidic media. Journal of scientific Research 257(8): 84-89.
Andreni, S., Znini, M., Padini, J., Majidi, L., Hammouti, B., Costa, J. and Muselli, A. (2016). Study of corrosion inhibition for mild steel in hydrochloric acid solution by Limbarda crithmoide (L) essential oil of Corsica. Journal of material andenvironmental science 7 (1): 187- 195.
Arockiasary, P., Queen, X., Rosary, S., Thermozhi, G., Franco, M., Wilson, S. and Jayasanthi, R. (2014). International Journal of Corrossion, 14: 6-7.
Chinwko, Emmanuel Chuka., Odio B. O., Chukwuneke J. L and Sinebe, J. E. (2014). Investigation of the effect in five different environments. International Journal of scientific and Technology Research, 3(7): 306.
Fontana, M.G (1986). Corrosion Engineering (3rd edition). Newyork: MCG Raw Hill Book company, 3: 521-528.
Grafen, H., Horn, E., Schlecker, H. and Schindler, H. (2002). Corrosion (1st edition). Uilmann’s Encyclopedia of Industrial Chemistry, Wiley- Vat, Wleinhein; 220-221.
Hammouti, B., Tales, M., Brighli, M. and Kertit, S. {2015}. Corrosion Houston 5{6}: 411-416.
Inemesit A. Akpan and Nnanake-Abasi O. Offiong. (2013). Inhibition of mild steel corrosion in hydrochloric acid solution by ciprofloxacin drug. International journal of corrosion. 2: 76-77.
James, O., Ajanaku, K., Ogunniran, O., Ajani, T., Siyanbola, M. and John, M. (2011). Trends in Applied Sciences. Research volume 6{8}: 910-917..
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