EFFECT OF INHIBITOR(NEEM LEAF) ON CORROSION OF GALVANIZED STEEL AND ROOFING NAIL IN SALINE ENVIRONMENT (NACL)
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Inhibitory effect of the neem extract (Az adirachtaindica)for galvanized steel and roofing nail in NaCl solution was studied. The studies revealed hatthe corrosion in hibition efficiency rises with extract concentration. In hibition efficiency increases up to 600ppm then it stabilizes. Inhibition efficiency was found tobe 86% at 600 ppm and increases with elevation in temperature. The decrease in activation energy (Ea) and enthalpy shows that corrosion inhibition is chemisorptions and exothermicin naturere spectively. Electro chemical experiments were performed with and without inhibitor and results were discussed. Result showed that neem leaf extract (Azadirachtaindica) is apromisingcandidatetominimizethecorrosioninalkalinemedium,asitshowsgoodinhibitionefficiency.
TABLE OF CONTENTS
TITLE PAGE
APPROVAL PAGE
DEDICATION
ACKNOWLEDGEMENT
ABSTRACT
TABLE OF CONTENT
CHAPTER ONE
- INTRODUCTION
- background of the study
- problem statement
- aim and objective of the project
- Significance of the study
- Scope of the study
CHAPTER TWO
2.0 LITERATURE REVIEW
2.1 Review of the study
2.3 Neem plant – Azadirachtaindica (AZI)
2.3 Neem Plant description
2.4 Ecology of neem
2.5 Uses of neem
2.6 Galvanized steel
2.7 Advantages of galvanized steel
CHAPTER THREE
3.0 MATERIAL AND METHOD
3.1 Preparationofspecimen
3.2 Plantextractpreparation
3.3 Gravimetricstudy
3.4 Potentiodynamicpolarizationmeasurements
CHAPTER FOUR
RESULT ANALYSIS
4.0 Result and Discussion
CHAPTER FIVE
- Conclusions
References
CHAPTER ONE
INTRODUCTION
1.1 Background of the study
Corrosion isa natural phenomenon and is defined as detoriation of metaldue to adverse environmental condition. Corrosion is a very damaging process, as it affects theact of metallic material which used in industries(Sharma et al, 2009).
The corrosion of metals in many industries, constructions,installations,andcivilservicessuchaselectricity,water,andsewagesuppliesisaseriousproblem.
Consequences ofcorrosion are losses in the properties of metal like ductility,malleability and weakening of metal. It has been evidencedthat, in alkaline medium, the layer forming on metal acts as adouble layer model. In alkaline solution, formation of strongpassivationappearsonsurfaceofmetal.However,inthepresenceofCL-ions,thepassivationisweakened,whichleadstocorrosionathigherrate(Sharma et al, 2009).
Inordertopreventorminimizecorrosion,inhibitorsareusuallyusedespeciallyinflow cooling systems. Organic, inorganic, or a mixture ofboth inhibitors can inhibit corrosion by either chemisorptiononthemetalsurfaceorreactingwithmetalionsandformingabarrier-typeprecipitateonitssurface
Galvanized steel metal is commonly used in various industries while roofing nails are mostly used in building industries.However, these metals are exposed to aggressive environmentnamelyalkaline,acidicmediumandsaltsolutionthroughmanyengineeringdevelopments(Sharma et al, 2009).
Though different methods to protect metal from aggressive environment, namely corrosion preventing coating, cathodic and anodic prevention technique are available, greencorrosion inhibitors is inexpensive and environmentally friendly.
When metal gets exposed to the aggressive environment,theextentofcorrosiondependsonoperatingcondition(T,pH), time of exposure of metal in that environment, with andwithoutinhibitor,andtype ofaggressive environment5.
Green corrosion inhibitors are derived from plants andused in small quantity to combat the corrosion6. Inhibitorsshould have the ability to reduce the corrosion rate and metalprotected from corrosive environment. Small quantities ofinhibitorshouldresultinhighercorrosioninhibitionefficiency.Neem leaf extract was proposed green corrosion inhibitorforcorrosioninhibitionofgalvanisedsteelinsalineenvironment(NACL)duetoitsantioxidantproperty
In this work, the chemical behaviour of galvanized steel and roofing nail with 0.5 wt% NaCl solution at different temperatures and concentration with and without inhibitor (neem leafextract) is reported with the data obtained from gravimetricmethod,potentiodynamicpolarizationtechnique.
1.2 Problem statement
According to Bothi et al (2018), the used of organic compounds to determine the corrosion inhibition potential are not only expensive, but also toxic to living beings. It is the important to look for cheap and safe inhibitors of corrosion.
Plant extracts was chosen to solve the above mentioned problem this is because they are environmentally acceptable, readily available, and renewable source for wide range of inhibitors (Rajendran et al, 2014). They are the rich sources of ingredients which have very high inhibition efficiency and are hence termed “Green Inhibitors” (Lebrini et al, 2018). Green corrosion inhibitors are biodegradable and do not contain heavy metals or other toxic compounds (Sharma et al, 2009).This study was carried out to show the significant inhibition efficiency of neem leaf.
1.3 Aim and objectives of the study
The main aim of this study is to determine the Inhibitoryeffect of the neemextract (Azadirachtaindica)for galvanized steel and roofing nail in 1 wt%Ca(OH)2+ 0.5 wt%NaCl solution. The objectives are:
- To determine the corrosion inhibiting strength of neem leaf on galvanised steel and roofing nail.
- To determine the chemical behaviour of galvanized steel with 1wt% Ca(OH)2 + 0.5 wt% NaCl solution at different temperatures and concentration with and without inhibitor (neem leafextract).
- To determine the inhibition efficiency of neem leaf
1.4 Significance of the study
Using neem leaf which is one of the plant extracts and organic species is very important way of protecting corrosion because it is environmentally acceptable, readily available, and renewable source for wide range of inhibitors.
The result of this study would help reduce the economic cost of corrosion control as well as decrease the subsequent environmental threats from inhibitor usage because neem leaves extract is non-toxic and biodegradable.
1.4 Scope of the study
The scope of this study covers the inhibition efficiency of corrosion of the extract of neem leaves (Azadirachtaindica) on galvanised steel and roofing nail with a sodium chloride. Corrosion speed was determined and it was found that the Neem extract, at a lower concentration, reached better efficiencies on galvanised steel and roofing nail in sodium chloride Besides, through the adjustment to the Langmuir’s isotherms, it was possible to determine that the nem extract was adsorbed spontaneously on the surface of carbon steel and allowed to delay the corrosive process when reaching inhibition efficiencies of 90%. Results of this research allow establishing that the neem extract has a high potential as corrosion inhibitor to be applied in the industry as corrosion preventive medium.
CHAPTER TWO: The chapter one of this work has been displayed above. The complete chapter two of "effect of inhibitor(neem leaf) on corrosion of galvanized steel and roofing nail in saline environment (nacl)" is also available. Order full work to download. Chapter two of "effect of inhibitor(neem leaf) on corrosion of galvanized steel and roofing nail in saline environment (nacl)" consists of the literature review. In this chapter all the related work on "effect of inhibitor(neem leaf) on corrosion of galvanized steel and roofing nail in saline environment (nacl)" was reviewed.
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CHAPTER FOUR: The complete chapter four of "effect of inhibitor(neem leaf) on corrosion of galvanized steel and roofing nail in saline environment (nacl)" is available. Order full work to download. Chapter four of "effect of inhibitor(neem leaf) on corrosion of galvanized steel and roofing nail in saline environment (nacl)" consists of all the test conducted during the work and the result gotten after the whole work
CHAPTER FIVE: The complete chapter five of "effect of inhibitor(neem leaf) on corrosion of galvanized steel and roofing nail in saline environment (nacl)" is available. Order full work to download. Chapter five of "effect of inhibitor(neem leaf) on corrosion of galvanized steel and roofing nail in saline environment (nacl)" consist of conclusion, recommendation and references.
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