Potential of Azadirachta indica as a green corrosion inhibitor against mild steel, aluminum, and tin: a review

Sharma, Sanjay K.; Peter, Anjali; Obot, I.B.

doi:10.1186/s40543-015-0067-0

Cited by 66 publications

(32 citation statements)

References 63 publications

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“…5, 6 and 7, from which the kinetic parameters were listed in Table 2. All the isotherms fitted well, with approximately more than 0.95 regression coefficient (R 2 ) and were in the order, Langmuir > Freundlich > Temkin [45]. Increase in temperature resulted to a decrease in K ads values, for Langmuir and Freundlich and indicate physical adsorption or an electrostatic pull of the charged hydrophilic The negative values of the free energy of adsorption ( ΔG 0 ads ) indicated that adsorption of NBL molecules was spontaneous and stable on the AA7075-T7351 surface [46].…”

Section: Effect Of Inhibitor Concentration and Adsorption Isothermmentioning

confidence: 95%

Newbouldia laevis Leaves Extract as Tenable Eco-Friendly Corrosion Inhibitor for Aluminium Alloy AA7075-T7351 in 1 M HCl Corrosive Environment: Gravimetric, Electrochemical and Thermodynamic Studies

2020

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The corrosion inhibition evaluation of aluminium alloy AA7075-T7351 in 1.0 M HCl environment, by biologically active and water soluble luteolin 7-glucoside and phenolic polymeric compounds in Newbouldia laevis (NBL) extracts-as organic corrosion inhibitors of aluminium-have been investigated using gravimetric, electrochemical and thermodynamic techniques respectively, at room temperature (25 ± 1 °C), and at elevated temperatures of 40, 50, 60 and 65 °C. Gravimetric results showed that optimal inhibition efficiency ( ), at room temperature (298 ± 1 K) and 338 K are 86.1% and 67.5% respectively for the maximum concentration of 0.6 g/L. This suggests that NBL extract was affected by temperature and accomplished the inhibiting episode through an electrostatic pull of the polymeric components of the NBL extract onto AA7075-T7351 coupons or physical adsorption, that obeyed Langmuir, Freundlich and Temkin adsorption isotherms, in increasing order; Temkin, Freundlich and Langmuir. Adsorption coefficient, K ads , and Gibb's free energy of adsorption, ΔG 0 ads , values obtained from Temkin isotherms were high and proved that adsorption of NBL on AA7075-T7351 surfaces were strong and spontaneous. Potentiodynamic polarization and electrochemical impedance spectroscopy results showed that NBL is a mixed-type corrosion inhibitor of AA7075-T7351 in 1 M HCl environment, which was achieved through the blockage/obstruction/reduction of charge flow by the polymeric barrier on the aluminium alloy's surface. Increases in the linear part of the Bode plot slopes with increase in NBL concentrations further indicated the existence of a protective layer on the AA7075-T7351 surface.

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Section: Effect Of Inhibitor Concentration and Adsorption Isothermmentioning

confidence: 95%

Newbouldia laevis Leaves Extract as Tenable Eco-Friendly Corrosion Inhibitor for Aluminium Alloy AA7075-T7351 in 1 M HCl Corrosive Environment: Gravimetric, Electrochemical and Thermodynamic Studies

2020

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“…Large numbers of organic extracts of plant materials have been used to prevent a variety of metals such as mild steel [17][18][19][20][21][22][23][24][25][26][27][28], various types of steel [29,30], cast iron [31] aluminum and its alloys [32][33][34], zinc and its alloys [35][36][37][38], copper [39][40][41], nickel [42,43] and tin [44,45].…”

Section: Organic Green Inhibitorsmentioning

confidence: 99%

Green Methods for Corrosion Control

Emran¹,

Ali²,

lehaibi³

2018

Corrosion Inhibitors, Principles and Recent Applications

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Corrosion of metals is a serious environmental problem. Most of the corrosion inhibitors are synthetic chemicals that are hazardous to environments and expensive. Today, there has been an increasing search for green corrosion inhibitors, due to the toxicity of some inhibitors. Green corrosion inhibitors are biodegradable and free of heavy metals or other toxic compounds. There is an intensive effort underway to develop new plant origin corrosion inhibitors for metal subjected to various environmental conditions. Salts of rare earth elements can be also used as inorganic alternative nontoxic corrosion inhibitors. Sol-gel coatings can be recommended as green protective films for metal corrosion. The origin of sol-gel process, its advantages and limitations, and the type of coating method are presented in this chapter, as well as a brief summary of recent literature concerning the use of hybrid inorganic-organic sol-gel and nanostructured sol-gel protective coatings for metal corrosion in different media.

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“…It has been generally proven that heteroatom organic substances containing mainly oxygen, sulphur, nitrogen atoms, and multiple bonds in the molecules can be adsorbed onto the metal surface, as the active centres for the process of adsorption onto the metal surface. And it has been shown that the efficiency, generally, follows the sequence O < N < S < P [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Corrosion studies of mild steel in sulphuric acid medium by acidimetric method

2019

Int. J. Corros. Scale Inhib.

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Many corrosion monitoring techniques are available to study the behaviour of inhibitors in various media. Common among these techniques are weight loss, gasometric, thermometric, acidimetric, electrochemical impedance spectroscopy and a host of others. Each of these techniques has its strengths and weaknesses. While some of them are quite prone to errors, others require, extremely, expensive instrumentation. The acidimetric technique is, however, the least applied of among these techniques, in spite of its obvious advantages of simplicity, less prone to error and inexpensiveness. In this research work, we applied the acidimetric technique to the study of corrosion inhibition of mild steel in H 2 SO 4 medium using urea, an organic molecule, as an inhibitor. The efficacy of the technique was then compared with an established and commonly applied corrosion monitoring technique; the weight loss technique. The two techniques were found out to give quite comparable results. However, the acidimetric technique was found to be faster, simpler, and yielded comparatively better results. The inhibition efficiency, %IE, which has the same trend for the two methods, decreased with increase in temperature, suggestive of physisorption. This was collaborated by values of activation energy, E a , which are all below 80 kJ/mol. The adsorption mechanism of urea adsorption onto the metal surface was, therefore, resolved with the use of Adejo-Ekwenchi isotherm adsorption model to be physisorption, with the best fit adsorption isotherms being the Langmuir and El-Awady isotherm models.

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Potential of Azadirachta indica as a green corrosion inhibitor against mild steel, aluminum, and tin: a review

Cited by 66 publications

References 63 publications

Newbouldia laevis Leaves Extract as Tenable Eco-Friendly Corrosion Inhibitor for Aluminium Alloy AA7075-T7351 in 1 M HCl Corrosive Environment: Gravimetric, Electrochemical and Thermodynamic Studies

Newbouldia laevis Leaves Extract as Tenable Eco-Friendly Corrosion Inhibitor for Aluminium Alloy AA7075-T7351 in 1 M HCl Corrosive Environment: Gravimetric, Electrochemical and Thermodynamic Studies

Green Methods for Corrosion Control

Corrosion studies of mild steel in sulphuric acid medium by acidimetric method

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