Effect of hexamethylpararosaniline chloride (crystal violet) on mild steel corrosion in acidic media

Oguzie, Emeka E.; Njoku, V.O.; Enenebeaku, Conrad K.; Akalezi, Chris O.; Obi, C.L.

doi:10.1016/j.corsci.2008.09.017

Cited by 125 publications

(55 citation statements)

References 23 publications

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“…IB > MB > CV which is in good agreement with inhibition efficiency (IE %) of the experimental results, see [28,29,32]. In addition, inhibition efficiency is closely related to the reactivity of individual molecular orbital contributions to the response of the whole molecular continuum.…”

Section: Molecular Reactivitysupporting

confidence: 74%

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Density Functional Theory of Mild Steel Corrosion in Acidic Media Using Dyes as Inhibitor: Adsorption onto Fe(110) from Gas Phase

Oguike

Kolo

Shibdawa

et al. 2013

ISRN Physical Chemistry

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Quantum chemical calculations based on density functional theory (DFT) methods were performed on indigo blue (IB), methylene blue (MB), and crystal violet (CV) molecules as inhibitors for iron corrosion in acid media. DFT calculations were performed on the molecular structures to describe electronic parameters which are associated with inhibition efficiency such as the Homo values −4.981 eV, −4.518 eV, and −3.872 eV which increased in the order IB > MB > CV while LUMO values were −3.73 eV, −3.63 eV, and −2.87 eV for IB, MB, and CV, respectively. Quench molecular dynamics simulations performed at metal/vacuum interface were applied to find the equilibrium adsorption configurations and calculate the minima interaction energy between inhibitor molecules and iron surface Fe(110). The theoretical order of inhibition efficiency of these dye molecules had a linear relationship with experimentally observed inhibition efficiency on iron corrosion in acid media. The electronic structures as well as reactivity elucidate parameters which could be practical in designing novel high-efficiency, cheap, and eco-friendly inhibitors by quantitative structure-activity relationship (QSAR) method.

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Section: Molecular Reactivitysupporting

confidence: 74%

“…According to the frontier molecular orbital theory, low values of LUMO should also indicate a strong tendency of electron-accepting abilities of the molecule and as seen in Figure 3 in the order of [29]; c [32].…”

Section: Molecular Reactivitymentioning

confidence: 99%

Density Functional Theory of Mild Steel Corrosion in Acidic Media Using Dyes as Inhibitor: Adsorption onto Fe(110) from Gas Phase

Oguike

Kolo

Shibdawa

et al. 2013

ISRN Physical Chemistry

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“…This process occurs simultaneously with the substitution process between the MDMAE in the aqueous solution and water molecules pre-adsorbed at the metal surface [H 2 O (ads)] 22 as given in Equation 7:…”

Section: CLmentioning

confidence: 99%

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

Loto

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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“…However, the activation energy of crack growth in inhibited sulfide-containing solution (CB + Na 2 S + IFKhAN-29-3) decreases considerably; hence, the efficiency of inhibitory protection increases with an increase in the temperature. This effect may be due to the formation (or strengthening) of chemical bonds between the organic molecules and the metal surface, i.e., an increase in the inhibitor chemisorption with an increase in temperature [30,31]. Yet another explanation may lie in the acceleration of the inhibitor absorption on the freshly formed metal surface at the tip of a growing crack.…”

Section: Resultsmentioning

confidence: 99%

Effect of temperature on the crack growth in pipe steel X70 in a weakly acidic electrolyte

2017

Int. J. Corros. Scale Inhib.

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Effect of hexamethylpararosaniline chloride (crystal violet) on mild steel corrosion in acidic media

Cited by 125 publications

References 23 publications

Density Functional Theory of Mild Steel Corrosion in Acidic Media Using Dyes as Inhibitor: Adsorption onto Fe(110) from Gas Phase

Density Functional Theory of Mild Steel Corrosion in Acidic Media Using Dyes as Inhibitor: Adsorption onto Fe(110) from Gas Phase

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

Effect of temperature on the crack growth in pipe steel X70 in a weakly acidic electrolyte

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