Effect of novel cytosine-l-alanine derivative based corrosion inhibitor on steel surface in acidic solution

Hu, Ke; Zhuang, Jia; Zheng, Chao-Chao; Zhu, Mingshan; Li, Yan; Gu, Hubo; Zeng, Xianguang; Ding, Jiating

doi:10.1016/j.molliq.2016.07.008

Cited by 49 publications

(15 citation statements)

References 47 publications

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“…Here, Y 0 is the amplitude comparable to a capacitance, j is the square root of -1, ω is angular frequency (=2f max ) at which the imaginary part of the impedance (-Z im ) is maximal and f max is AC frequency at maximum, n is the phase shift, which can be used as a gauge of the heterogeneity or roughness of the carbon steel surface [26][27][28]. The decrease in double layer capacitance (C dl ) value (Table 3) in presence of PCIP as compared to that in its absence can be attributed to a decrease in the dielectric constant or increase in the thickness of the electrical double layer, which suggests the adsorption of PCIP at the metal/solution interface [29].…”

Section: Electrochemical Impedance Spectroscopymentioning

confidence: 99%

Expired Podocip drug as potential corrosion inhibitor for carbon steel in acid chloride solution

2018

Int. J. Corros. Scale Inhib.

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The application of expired drugs as corrosion inhibitors provides a cost effective and environmentally benign alternative to otherwise tedious and costly disposal/degradation process. In this context, we have investigated the use of expired Podocip (PCIP) drug as corrosion inhibitor for carbon steel in 1 M HCl by weight loss and electrochemical methods. Polarization curves revealed that the inhibiting action of the PCIP is mixed-type. The adsorption of PCIP on carbon steel surface obeys the Langmuir isotherm. Impedance analysis showed that the presence of inhibitor considerably affects the charge transfer resistance and the double layer capacitance of carbon steel surface. SEM and AFM studies evidenced the formation of a protective film over metal surface.

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Section: Electrochemical Impedance Spectroscopymentioning

confidence: 99%

Expired Podocip drug as potential corrosion inhibitor for carbon steel in acid chloride solution

2018

Int. J. Corros. Scale Inhib.

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“…The calculated values of the thermodynamic adjustment are also shown in Table 3. Several authors mention that the values of ∆G° ads around -40 KJ/mol or more negative are consistent with the charge interchange between the metal and the organic compound, so the reaction is defined as a chemisorption, while the values of ∆G° ads lower than -20 KJ/mol produce only an electrostatic interaction (physisorption) [50][51].…”

Section: Adsorption Isothermmentioning

confidence: 86%

PREPRINT- Adsorption behavior of new theophylline-triazole based derivatives as effective corrosion inhibitors for steel in acidic medium

Espinoza-Vázquez¹,

Rodríguez-Gómez²,

Martínez-Cruz³

et al. 2019

Preprint

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The design and synthesis of a series of theophylline derivatives containing 1,2,3-triazole moieties is presented. The corrosion inhibition activities of these new triazole-theophylline compounds were evaluated by studying the corrosion of API 5L X52 steel in 1 M HCl media. The results showed that an increase in the concentration of the theophylline-triazole derivatives also increases the charge transference resistance (Rct) value, enhancing inhibition efficiency and decreasing the corrosion process. The electrochemical impedance spectroscopy under static conditions studies revealed that the best inhibition efficiencies (~90%) at 50 ppm are presented by the all- substituted compounds. According to the Langmuir isotherm, the compounds 4 and 5 analyzed exhibit physisorption-chemisorption process, with exception of the hydrogen 3, bromo 6 and iodo 7 substituted compound, which exhibit chemisorption process. The corrosion when submerging a steel bar in 1 M HCl was studied using SEM-EDS. This experiment showed that the corrosion process decreases considerably in the presence of 50 ppm of the organic inhibitors. Finally, theoretical study showed a correlation between EHOMO, hardness (η), electrophilicity (W), atomic charge and the inhibition efficiency in which the iodo 7 substituted compound presents the best inhibitor behavior.

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“…As the corrosion inhibitionm echanism of an organic inhibitor (comprising p electrons, double conjugated bonds, and heteroatoms such as nitrogen) correspondst ot he formation of a metal surfacep rotective film, it originates from coordinated bonds with outer and empty iron orbital (or metal) atoms. [63,64] Figure 10 presents j Z j 0.01 Hz as afunctionoftime for the evaluated systems (both the scratched and unscratched coatings, as well as those corresponding to the metal withoutac oating). The red line indicatesa na brupt impedance decrease at the scratching time of the coating.A fter that, the system subsequently recovered the film, that id, the j Z j 0.01 Hz value increasedw ith the time, reaching 2.5 10 5 GW cm 2 ,w ith ar atio of 1.7 10 4 W cm 2 h À1 ;t his could be attributed to the inhibitor protectiveb ehavior,w hich was released from the porous matrix as soon as it contacted the electrolytic solution.…”

Section: Electrochemical Testsmentioning

confidence: 99%

SBA15–Fluconazole as a Protective Approach Against Mild Steel Corrosion: Synthesis, Characterization, and Computational Studies

et al. 2018

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A SBA15–Fluconazole composite (SBA15‐Flu) was prepared to formulate a self‐healing coating for mild steel. The composite was obtained by dispersing SBA15 in a methanolic solution containing Fluconazole (Flu). The materials were characterized by using different techniques. Electrochemical impedance spectroscopy (EIS) was used for protective behavior evaluation of the coatings on mild steel substrates in an electrolytic solution prepared from sodium chloride and ammonium sulfate. The EIS results indicate that the inhibitor trapped in the SiO2 matrix is released when it comes into contact the aggressive solution, thus protecting the metal. To understand the inhibitor release mechanism, docking studies were used to model the SBA15‐Flu complex, which allowed us to further determine polar and non‐polar contributions to the binding free energy. An analysis of the electron density within the quantum theory of atoms in molecules and the non‐covalent interaction index frameworks were also carried out for the most favorable models of SBA15‐Flu. The results indicate that the liberation rate of the Flu molecules is mainly determined by the formation of strong O−H⋅⋅⋅O, O−H⋅⋅⋅N, and O−H⋅⋅⋅F hydrogen bonds.

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Effect of novel cytosine-l-alanine derivative based corrosion inhibitor on steel surface in acidic solution

Cited by 49 publications

References 47 publications

Expired Podocip drug as potential corrosion inhibitor for carbon steel in acid chloride solution

Expired Podocip drug as potential corrosion inhibitor for carbon steel in acid chloride solution

PREPRINT- Adsorption behavior of new theophylline-triazole based derivatives as effective corrosion inhibitors for steel in acidic medium

SBA15–Fluconazole as a Protective Approach Against Mild Steel Corrosion: Synthesis, Characterization, and Computational Studies

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