Corrosion Inhibition of Metal Using Lawsonia Inermis Extract

Corrosion Inhibition of Metal Using Lawsonia Inermis Extract Introduction Metal and alloy are widely used in various fields of industries. It’s commonly used in big industries such as manufacturing, processing and others. But metal and alloy used tend to face the corroded state due to the exposure to different chemical and substances that can lead to the corrosion. This phenomenon has become important especially in acidic media because of the increased industrial applications of acid solutions. For examples in industrial refining crude oil, acid pickling, industrial cleaning, acid descaling, oil-well acid in oil recovery and the petrochemical processes. Corrosion happens when the equipment surface was attacked by a strong acid. So in order to prevent the corrosion happen, inhibitors have been used to reduce the rate of metal corrosion. Corrosion inhibitor is a chemical that can slow down the acid attacked which can lead to the corrosion on the drill pipe, tubing or any other metal that contacted with acid during treatment. This chemical when added even in small concentration on corrosive media, it will prevent the reaction between metal and media. Many studies have been carried out to find the suitable compound that can be used as inhibitors. These studies reported that, both synthetic compound and plant extract can be used as corrosion inhibitors. But, usage synthetic compound as inhibitor has been limited. Most of them are highly toxic to both human and environmental. Therefore, non-toxic and natural inhibitors such as plant extract have been used because of their environmentally acceptable, readily available and renewable source. One of the plant extract that have been used as inhibitor is Lawsonia inermis (henna leaves) extract. Henna is an herb which has dyeing properties used in Asia and North Africa. Inhibitive action of henna extract as a cheap, eco-friendly and naturally occurring inhibition on some metal such as aluminium, iron, zinc and nickel in acidic, neutral and alkaline solution has been investigated. Literature Review In order to avoid from use synthetic compound, there are other alternative compound which can be used as an inhibitor. Previous research has been carried out and proved that plant extract can be use in corrosion inhibition. Plant extract consists of chemical compositions lead to prevent metal from corroded. But Buchweishaija (2008) state that among of the plant extract, Lawsonia inermis (henna leaves) was the good one due to the high inhibition efficiency of henna leaves extract. Furthermore, the large amount of henna leaves exist which makes it easy to find it in the Asia and North Africa. Also the most important thing is the unique chemical composition present in Lawsonia inermis by functioning as an inhibitor.    Chemical Composition of Henna Leaves Research was carried out to determine the chemical composition contain in henna leaves that can act as corrosion inhibitor. It has been discovered that henna leaves contain soluble matter, Lawsone (2- Hydroxyl-1,4-naphthoquinone, C10H6O3), gallic acid (3,4,5-trihydroxybenzoic acid, C7H6O5) and dextrose (ÃŽ ±-D-Glucose, C6H12O6) (Ostovari et al., 2009). Henna leaves also contain other chemical such as resin, coumarins, sterols and tannin (Ostovari et al., 2009). The main components of henna extract are hydroxy aromatic compound like tannin and Lawsone. Tannin or also known as tannic acid present with a core glucose and methyl gallate groups (El-Etre et al., 2005). Tannin which acts as an inhibitor attributes the formation of a passivating layer of tannates on the metal surface (Boot Mercer, 1964). Besides, Lawsone also a main part of henna extract that had been mentioned earlier. The structure of Lawsone is shown in Figure 2.1 below. Figure 2.1: Lawsone structure (C10H6O3) (Hamdy Nour, 2012) The Figure 2.1 above shows that, Lawsone structure consists of benzene, p-benzoquinone and phenolic group (Abdolahi Shadizadeh, 2012). By looking at the structure in Lawsone, we can know that henna extract is an organic compound and the IUPAC name for the Lawsone structure is 2-hydroxy-1, 4-naphthoquinone (Rajedran et al., 2009). Lawsone molecule is a ligand that can chelate with various metal cations and then forming a complex compound. So it can perform corrosion inhibition on metal through absorption method (Ostovari et al., 2009). Mechanism of inhibition The mechanism of inhibition involves blocking metal surface by inhibiting through adsorption. Adsorption process is affected by nature of metal and chemical structure of the inhibitor (Ostovari et al., 2009). The obtain results from previous studies indicate that Lawsonia inermis extract achieve good inhibition for the corrosion of any metal such as C-steel, nickel, and zinc in various mediums of solution (El-Etre et al.,2005). To perform the inhibitory action, there are some components in henna extract which will act as inhibitors. As had been stated earlier, the main components of Lawsonia inermis extract are hydroxy aromatic compound which consists tannin and Lawsone (El-Etre et al., 2005). Both tannin and Lawsone have its own function and mechanism to perform the inhibition action between the metal and henna extract successfully. Tannin The first component is tannin. The inhibitive action of tannin was ascribed to the establishment of a passivating layer of tannates on the metal surface (Rajagopalan et al., 1969; Booth Mercer, 1964). The formation of complex compounds with different metal cations can be form by tannin component especially in the basic media. El-Etre et al. (2005) reported that the formation of tannin complexes may be working well for the inhibition in the alkaline media rather than acidic solution it because tannins are limited inhibition in acidic media. Thus, tannin component in Lawsonia inermis extract is suitable to use in the manufacture of anti-rusting paints and coating. Lawsone The other main element in the Lawsonia inermis extract is Lawsone which has higher concentration than other elements. Lawsone molecule is a ligand that can chelate with metal cations which will form complex compounds. Ligands typically consist in organic compound. Insoluble complex was formed when metal cations combine with Lawsone molecule and it was absorbed on the metal surface. This is how Lawsone compound give inhibition action to the metal. There is such method that can prove the formation of metal complex which the method is conductometric titration.                           Mechanism of Conductometric Titration Method Often, conductometric titration was conducted to obtain substantial support for the formation of metal complex (Amin, 2002). Several procedures were conducted to confirm the formation of metal complexes. Conductance measurement was carried out with a Jenway 4510 conductivity meter. Lawsonia inermis extract was titrated in separated experiments with some metal in solutions that have different pH value. As the result of the titration, non-complexes of metal ion was reacted with reagent first which leads it to a reduction in the conductivity of the solution. However, the higher amount of ligand (henna extract) does not change the value of conductivity (Ostovari et al., 2009). These results signify that the formation of metal-complex through the chelation of Lawsone molecules and the metal cations with stoichiometric ratio of 1:1 and 2:1 as shown in Figure 2.2. Figure 2.2: Forms of Metal-Lawsonia complexes (El-Etre et al., 2005) So, it can be conclude that the inhibition action of Lawsone was happen and prove that henna leaves extract can act as inhibitor (Abdolahi Shadizadeh, 2012).                  Mechanism of Lawsone Rearrangement In the acidic solution or known as acidic media, aromatic compound whose structure include a cyclic delocalized Ï€-electron system are susceptible to electron delocalization, especially a ring containing only carbon such as benzene (Lide, 2006). Delocalization of Ï€-electron is to stabilize the molecule. As the bond angles of carbon in benzene are trigonal (sp2), then the ring become flat. So these angles just fit the 120o angles of a regular hexagon and this flatness allow the overlap of the p-orbitals in both directions that lead the delocalization and stabilization (Marrison Boyd, 1983). So that’s why it needs delocalization to stabilize the structure. In the other situation of Lawsone molecule in acidic media, delocalization of the lone pair of electrons on hydroxyl group takes place resulting in the rearrangement as shown in Figure 2.3. Figure 2.3: Process of electron delocalization on the Lawsone molecule (Ostovari et al., 2009) The migration of the hydrogen atom with a pair of electrons from an adjacent carbon to the carbon bearing caused the rearrangement occur. Carbon that loses the migrating group obtained the positive charge. This is the most common kind of the rearrangement which known as 1,2- rearrangement. Then, with the existence of metal cations, it will enhance the complex formation of reaction (Ostovari et al., 2009). Then the complex formation reaction of rearrangement was enhanced by adding henna extract in solution. So, the metal complexes are stabilized. The formation of these stabilized complexes between Lawsone molecule and metal cations give the high inhibition efficiencies in acidic media. Besides, Mikhael et al (2004) reported that henna constituent has antioxidant characteristic particularly by the naphthoquinones. It also state that, gallic acid also can be used as an oxygen scavenger in boiler system (Soderquist, 1990). Therefore, the oxygen scavenger characteristic of henna extract was attributed to another mechanism for inhibition. However in the acidic media, the main cathodic reaction at the surface is a hydrogen evaluation (Ait Chikh et al., 2005). Hence, the oxygen scavenging characteristic of henna is not the main responsible mechanism for the observed inhibition of henna extract. In addition, it is confirmed that the inhibition mechanism is the chemisorption of inhibitor molecule on the metal surface and it had been verified through thermodynamic parameter and conductometric titration. So as a conclusion, the main inhibitor mechanism chemisorption is through the chemisorption of inhibitor molecules on metal surface. While, the inhibitive action slightly enh anced through oxygen scavenging. (Ostovori et al, 2009). Comparison Henna Extract with Other Inhibition There is another organic compound that can be used as inhibitor besides henna extract. Previous studies has been conducted to test the inhibition efficiency of henna and five other organic compound inhibitor used in acidizing treatment. Table 2.1 show the result of inhibition efficiency of these six inhibitors. Table 2.1: Inhibition efficiency of MEA, DEA, TEA, and henna API steel (Abdollahi Shadizade, 2012) Refer to the Table 2.1 above; the inhibition efficiency was compared between Monoethanolamine (MEA), Diethanolamines (DEA), Triethanolamines (TEA), Dibenzylidene acetone (DBA), Di-N-dimethylaminobenzylidene acetone (DDABA) and henna. The inhibition efficiency of MEA, DEA, TEA and henna at temperature 28oC are 82%, 80%, 78% and 85.98% respectively. Based on the result, it shows that henna has the higher inhibition efficiency than MEA, DEA and TEA. Morever as shown in Table 2.1, the inhibition efficiency of henna extract at 28oC is higher than inhibition efficiency of DDABA with 73.8% IE. Furthermore result also shown that inhibition concentration of henna extract is less than all inhibitors with the same temperature eventhough it have higher inhibition efficiency. So we can conclude that, with the small concentration of henna leaves extract, it can act as inhibitor with higher inhibition efficiency rather than other listed inhibitors which have larger concentration but average of inhibition efficiency is low than henna extract. In addition, research still focused to the amount of henna leaves extract in order to apply it in industries as now the amount of henna is quiet small to apply it. So, the experimental must be conducted by using larger amount of henna leaves and various metals Problem Statement Nowadays, metal and alloy are widely used in various industries especially in manufacturing and processing. But the problem is the metals used tend to faced corrosive when the surface of equipment attacked by strong acid media or any other media. But mostly, acidic media are the main causes for corrosive to happen due to the increasing of industrial application an acid solution. So in order to prevent from corrosion of metal, inhibitor has been used. However the use of synthetic compound as inhibitor is extremely dangerous either to the body and the environment due to the toxicity. Thus, studies are conducted to find the non-toxic and natural inhibitors. The study shows that plant extract can be used as corrosion inhibitor. One of them is henna leaves extract. Besides being environmentally acceptable and readily available, henna leaves extract also cheap as it’s easy to find in Asia and North Africa and renewable sources. Objectives There are few objectives that has been studies in order to solve corrosion phenomenon and carried out the research on corrosion inhibitor of metal by using Lawsonia inermis extract. The objectives are: Study of corrosion inhibition of metal by using henna leaves extract. Analysis mechanism of inhibition towards metal. Investigate the differences between henna leaves extract with other inhibitor.

The Death Penalty: In The Name Of Justice? :: essays research papers

The state murdering people because of their crimes simply does not equate to justice. It is real easy to hear about how the government is doing this wrong or that, but the death penalty is abounded with so many injustices and faults that it’s an embarrassment to our entire due process of law. Supporters of capital punishment subscribe to religious and ethical points of view rather than facts, and when they do offer facts it’s always the same argument: â€Å"It’s a deterrent.† The death penalty is extreamly flawed, most notably it comes with a very high price tag to an already under-funded correctional institution in America; no stable argument has been installed to warrant it as a deterrent; and the moral decay it establishes creates among other things a feeling of revenge and spite within society. Many people for and against the death penalty are under the proposed belief that capital punishment is a deterrent for crime. No study can offer a clear explanation of this theory. Almost a dozen states don’t offer a death penalty, and a dozen more haven’t executed in over fifty years that have one. Are their first and second-degree murder rates head and shoulders above the other states? Of course not. Some of these states include large metropolis’ such as Minnesota’s twin cites. Detroit has a high crime rate (in actual number not on a per capita basis) in Michigan, which doesn’t offer a death penalty, but Birmingham has one of the highest crime rates per capita in the nation. What has Alabama’s electric chair not done in Birmingham that life in prison has done in St. Paul? Deter crime, particularly murder. Studies have shown that, all evidence in view, long prison terms punish just as effectively as capital sentences. The flaws of capital punishment become too many shortly after they total one. This is because of the focus of the death penalty that being human life. Innocent people being sent to death or being released within weeks of execution are becoming frequent stories on the nightly news. The legal system is disturbingly unable to correctly administer the death penalty. Every day individuals who can’t afford a lawyer have to have one appointed to them under the constitution. Almost thirty percent of Americans can’t afford health care, how are they supposed to afford a lawyer? These lawyers, who are on average paid 5 dollars an hour, have little to no incentive to gather all the precious materials to adequately support the accused.

How Did Alexander Iii Reverse the Reforms of Alexander Ii?

Improvements in green To what extent did Alexander III reverse the reforms of his predecessor Alexander II? In many respects, there is no doubt that Alexander III was the most effective Tsar in such the short reign that he had. He was referred to as a reactionary, unlike his father Alexander II who was known as a reformer. He managed to please the people with his Russian figure and attitude, he changed their attitude and he made tsarism look all the better, all in a short period of time.Despite their different policies, they had the same goals/ambitions inside their head in the long run, and that was to strengthen Autocracy in the Russian empire but Alexander III did this by reversing what his father had done as he felt he knew better ways of dealing with the situation and strengthening the Tsarist position. The first thing that Alexander III did when he came into power to contradict his fathers reforms was to recall the decision of creating the constitution.Alexander III was a firm believer of the absolute power and judgment that autocracy and Russian history owned, he felt that Russia should stick to their traditional rules and the way things were run. Alexander put thins in to change this but Alexander III would not allow this and so reversed some of what he had done to make sure the Russian tradition stayed in place. He felt that a democratic Parliament was such a western way to think, NOT Russian. He preferred the principles of personal rule and he was so firm on this, he distrusted the bureaucracy.This lead to him wanting to be around conservative ministers such a Pobodenostev because he knew that if he was surrounded by the right people with the same mind has him, they too would want to reverse the reforms of Alexander II unlike the ones that he usually were with which was a mix of conservative and Liberal ministers that were influencing the changes in the first place. For many the many years that Alexander II tried to boost the tolerance of other religi ons, Alexander III abolished this straight away by demanding that Orthodox was the correct and Russian way to be thinking.This was probably due to the really strict views that his top advisor, Pobedonostev had. Pobedonostev managed to get all the primary schools under church rule and he also made sure that peasants and workers children would not be allowed into secondary school. This was to prevent any people knowing too much and finding out that maybe they way they are being governed isn’t the right way to go about. This totally goes against the Elementary School Statute of 1864 and it meant that the local zemstva weren’t in charge of funding them anymore as they were on the brink of knowing too much.Talking about education, Alexander III and Pobedonostev went against the 1863 University Statute that Alexander II welcomed which allowed universities to govern themselves and have their own sense of governing for the faculty and students. This is because conservative min isters that were around the Tsar felt that giving the people too much education was very dangerous as they’d learn to fight for themselves and find out about things that they probably would prefer they didn’t. This was reversed because Alexander III felt that Alexander II only did this to please the people and Liberal ministers that were influencing him.In 1870 zemstva reform was introduced for the people. This was for the people and they were allowed to be in control of education and road building in their local areas. This idea became very successful and even with the little power it had, it spread amongst much of Russia. This meant that it was a wider spread issue for Alexander III to deal with. Alexander III didn’t like this because he knew that the zemvsta were education people rather generously and this was dangerous as be believe that there should be the lower class of people so Tsarism could swarm and reign effectively.The Tsar couldn’t reign prop erly though with them in play because they were there for the local people and so the local people would only deal with the Zemstva and not higher up figures. When he came into power (Probably also with the help and guidance of Pobedonostev) he got rid of and restricted a lot of power that the zemstva had. He kept them so it made the people think that they had some form of power and influence but they didn’t really have that influence they thought they had. He knew that this was kind of working because the people didn’t coplain as much, they knew that they had the pportunity to do something about it and so decided that they were happy with what they had as it was a giant leap up from nothing anyway. He made Land Captains (as they were known) the most important members of each zemstva area and these people had the most power and say as they reported directly to the minister of the interior. They made sure that nothing went over the top or in any way threatened the Tsar. This is proof that the Zemstva lost power to what Alexander II had gave them so that the Tsar was stronger all due to Alexander III reversing the reform, to a reasonable extent.In 1870, Alexander made the reform of having trials that weren’t that bias and allowed Trail by Jury. This made the system fairer and meant that the people wouldn’t complain as much because the jurys consisted or your ‘ordinary’’ Russians. This meant that every trial was fair and easier to make a judgment on because you didn’t have conservative people making the judgment or people that were bias towards the tsar. This was to please the people however Alexander II didn’t realise that this was dangerous because he had put the public in the position yet the public don’t actually like the Tsar.Alexander III realised this because he spotted a case that was clearly one sided as the ‘ordinary Russians’ didn’t like the Tsarist reign much and so in a case where a radical extremist, Vera Zasulich was being trialed for shooting a police chief, was excused. To prevent any more ‘wrong’ verdicts from 1890 the government exercised the right to choose juries. Then there was the Statute of State Security in which courts had the right to detain and try political opposition members without the use of a jury as sympathy would be in play and this wasn’t the Tsarist way of dealing with things.Alexander III reversed the whole way that the court and opposition was dealt with and make it completely different to what Alexander II did. Alexander III didn’t reverse everything that his father put in place, infact, some things he rather embraced. He love how his father brought in the The Universal Military Training act of 1874. He felt that a strong military was a really good way of dealing with problems in Russia. It made them look really strong and an empire that shouldn’t be looked lightly upon and weak. This was a crutial re enforced reform because the Russian people and army ad lost moral due to the loss of the Crimean war to the British. They knew that they were such a large country yet they failed to win a war that was theirs for the taking. It was humiliating to them. He also didn’t reverse the reforms of Alexander II Russification programme. He felt that Russification was a really good way to be able to make the whole of the Russian empire, RUSSIAN in full. Have the same attitudes and everything. But one thing that he added was the Jewish Programmes. He made sure that the population was educated into believing that Jews were wrong and shouldn’t play a part in Russian society as they only caused problems.This made the whole picture of Russia much stronger for Alexander III and this is due to the re enforcement of Russification so in this case, he did not reverse the reform atall. Overall, I think that Alexander III did reverse many things that his father did becau se he felt he could make a stronger Russia based upon tradition and brute Russian attitude. I think however that due to him being so un prepared for such a powerful role in such a difficult time was the reason to why he made such irrational decisions.

Latin American Music And Latin America Essay - 1926 Words

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