An investigation on the inhibition effects of some new dithiophosphonic acid monoesthers on the corrosion of the steel in 1M HCl medium

Karakuş, Mehmet; Şahin, Mükerrem; Bilgiç, S.

doi:10.1016/j.matchemphys.2005.02.010

Cited by 43 publications

(21 citation statements)

References 22 publications

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“…where f (q, x) is the configurational factor which depends upon the physical model and assumptions underlying the derivative of the isotherm, 25 q is the surface coverage, C is the inhibitor concentration, x is the size ratio, a is the molecular interaction parameter and K is the equilibrium constant of the adsorption process.…”

Section: Adsorption Isothermsmentioning

confidence: 99%

Inhibition effect of deanol on mild steel corrosion in dilute sulphuric acid

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Popoola

2015

S.Afr.j.chem

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The influence of deanol on the corrosion behaviour of mild steel in dilute sulphuric acid with sodium chloride addition was studied by means of mass-loss, potentiodynamic polarization, electrode potential monitoring, scanning electron microscopy and statistical analysis. Results show that deanol performed excellently with a maximum inhibition efficiency of 97.9 % obtained from the mass loss technique and 98.23 % from the potentiodynamic polarization tests at the maximum deanol concentration evaluated. Polarization studies show that the amino alcohol is a cathodic type inhibitor. Adsorption of deanol on the steel surface was observed to obey the Langmuir and Frumkin adsorption isotherms. Scanning electron microscopy studies confirmed the corrosion protection property of deanol to be through adsorption on the mild steel surface while statistical evaluation showed the overwhelming influence and significance of inhibitor concentration on inhibition efficiency compared with exposure time. KEYWORDSOrganic compounds, metals, deanol, corrosion, sulphuric acid, inhibitor IntroductionMild steel has excellent mechanical properties. Its low cost allows for extensive use as the material of construction in petroleum industries, chemical processing plants, marine applications, boilers, refinery plants, extractive industries, etc. However, its application under these industrial conditions subjects it to rapid corrosion attack especially in applications involving the extensive use of sulfuric acid and other corrosive media due to their wide range of applications, including domestic acidic drain cleaner, electrolyte in lead-acid batteries and various cleaning agents.1 The most cost-effective and practical corrosion control technique for effectively preventing the occurrence or reducing the severity of corrosion is to alter the electrochemical nature of the environment with chemical compounds known as inhibitors.2,3 Effective corrosion inhibition is subject to the chemical composition, molecular structure and affinity of the inhibiting compound with the metallic alloy surface. Deanol has been used for corrosion prevention in concrete with mixed results. [4][5][6][7] The compound adsorbs through concrete resulting in the formation of a complex precipitate of protective film, which adsorbs onto the metal surface. This provides an impenetrable barrier to metal dissolution that acts to stifle cathodic and or anodic electrochemical corrosion reactions taking place at the metal/solution interface. This investigation aims to evaluate the corrosion inhibition properties of deanol on the electrochemical behaviour of mild steel in aqueous dilute sulphuric acid at ambient temperature of 25 °C.

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Section: Adsorption Isothermsmentioning

confidence: 99%

Inhibition effect of deanol on mild steel corrosion in dilute sulphuric acid

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Popoola

2015

S.Afr.j.chem

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“…Compounds rich in heteroatoms can be regarded as environmental friendly inhibitors because of their characteristic strong chemical activity and low toxicity [12]. The adsorption characteristics of organic molecules are also affected by sizes, electron density at the donor atoms and orbital character of donating electrons [13][14][15][16]. Organic compounds containing hetero atoms in the functional groups, pi-electron in triple or conjugated double bonds and presence of aromatic rings in their structure are the major adsorption centres and are usually good inhibitors [17].…”

Section: Introductionmentioning

confidence: 99%

Corrosion inhibition effect and adsorption behaviour of nicotinamide derivatives on mild steel in hydrochloric acid solution

2014

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Background A new class of nicotinamide derivatives viz., N-((1H-pyrrol-2-yl)methylene)nicotinamide, N-((methyl-(phenyl)amino)methylene)nicotinamide, N-nicotinoylbenzimidothioic acid and N-(4-(methylthio)benzylidene)nicotinamide have been synthesized and their corrosion inhibition effect on mild steel in 0.5 M HCl was investigated by mass loss, Tafel polarization technique and AC impedance measurements. Results The inhibition efficiency of the inhibitors on mild steel in 0.5 M HCl has been studied based on concentration, time interval and temperature. Potentiodynamic polarization studies showed that all the examined inhibitors suppress both anodic and cathodic process and behave as mixed type of corrosion inhibitors. Conclusions The adsorption of all the inhibitors was found to obey Langmuir isotherm model. Electrochemical impedance data revealed that polarization resistance (R P ) increases and double layer capacitance (C dl ) decreases as the concentration of the inhibitors increases. FTIR, EDX and SEM analyses were performed to study the film persistency of the inhibitors.

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“…The factors affecting the adsorption of these molecules, such as functional groups, steric factor, molecular size, electron density at the donor atoms and orbital character of donating electrons had been considered and discussed in terms of their inhibiting abilities. The inhibition efficiency has been closely related to the inhibitor adsorption abilities and the molecular properties for different kinds of organic compounds [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. The power of the inhibition depends on the molecular structure of the inhibitor.…”

Section: Introductionmentioning

confidence: 99%

Theoretical studies of some sulphonamides as corrosion inhibitors for mild steel in acidic medium

Ebenso

Arslan

Kandemi̇rlı

et al. 2010

Int J of Quantum Chemistry

149

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Density functional theory (DFT) at the B3LYP/6-31G (d,p) and BP86/ CEP-31G* basis set levels and ab initio calculations using the RHF/6-31G (d,p) methods were performed on four sulfonamides (namely sulfaacetamide (SAM), sulfapyridine (SPY), sulfamerazine (SMR), and sulfathiazole (STI)) used as corrosion inhibitors for mild steel in acidic medium to determine the relationship between molecular structure and their inhibition efficiencies (%IE). The order of inhibition efficiency obtained was SMR > SPY > STI > SAM which corresponded with the order of most of the calculated quantum chemical parameters namely E HOMO (highest occupied molecular orbital energy), E LUMO (lowest unoccupied molecular orbital energy), the energy gap (DE), the Mulliken charges on the C, O, N, S atoms, hardness (g), softness (S), polarizability (a), dipole moment (l), total energy change (DE T ), electrophilicity (x), electron affinity (A), ionization potential (I), the absolute electronegativity (v), and the fraction of electrons transferred (DN). Quantitative structure activity relationship (QSAR) approach has been used and a correlation of the composite index of some of the quantum chemical parameters was performed to characterize the inhibition performance of the sulfonamides studied. The results showed that the %IE of the sulfonamides was closely related to some of the quantum chemical parameters but with varying degrees/order. The calculated %IE of the sulfonamides studied was found to be close to their experimental corrosion inhibition efficiencies. The experimental data obtained fits the Langmuir adsorption isotherm. The negative sign of the E HOMO values and other thermodynamic parameters obtained indicates that the data obtained supports physical adsorption mechanism.

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An investigation on the inhibition effects of some new dithiophosphonic acid monoesthers on the corrosion of the steel in 1M HCl medium

Cited by 43 publications

References 22 publications

Inhibition effect of deanol on mild steel corrosion in dilute sulphuric acid

Inhibition effect of deanol on mild steel corrosion in dilute sulphuric acid

Corrosion inhibition effect and adsorption behaviour of nicotinamide derivatives on mild steel in hydrochloric acid solution

Theoretical studies of some sulphonamides as corrosion inhibitors for mild steel in acidic medium

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