Corrosion Inhibition of Welded of X – 52 Steel Pipelines by Sodium Molybdate in 3.5% NaCl Solution

Tristijanto, Hery; Ilman, Mochammad Noer; Iswanto, Priyo Tri

doi:10.1016/j.ejpe.2020.02.001

Cited by 46 publications

(21 citation statements)

References 42 publications

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“…This drop in the iron band demonstrates that an attached resistant inhibitor film has been deposited on the surface of polished C steel, resulting in good IE. 38 The surface evaluations of the CS (EDX and SEM) thus confirmed that the formulated molecules (S1, S2, and S3) in the tested medium represent strong inhibitors (in line with the results obtained from electrochemical methods).…”

Section: Resultssupporting

confidence: 80%

Anticorrosion Effect of Ethoxylate Sulfanilamide Compounds on Carbon Steel in 1 M Hydrochloric Acid: Electrochemical and Theoretical Studies

et al. 2021

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Metal corrosion is an important economic problem globally. One of the best ways to protect metal surfaces from corrosion is by the use of corrosion inhibitors, especially surfactants. This study assesses anticorrosion properties of three inhibitor compounds (S1, S2, and S3) of ethoxylate sulfanilamide containing 2, 10, and 20 units of ethylene oxide on carbon steel in 1 M HCl solution. The anticorrosive performance of S1, S2, and S3 was studied using potentiodynamic polarization (PDP), electrochemical impedance spectroscopy (EIS), adsorption isotherm, surface tests (scanning electron microscopy (SEM), energy-dispersive X-ray (EDX) spectroscopy, and X-ray diffraction (XRD) analysis), and computational studies (density functional theory (DFT) and molecular dynamics (MD) simulations) within the concentration range of 10 –6 to 10 –2 M at 30 ± 2 °C. The results of the methods used indicate that increasing the concentration of the inhibitor compounds improves the effectiveness of inhibition (from 50.9 to 98%), whereas the inhibition efficiency order for ethoxylated sulfanilamide compounds is S2 > S3 > S1 with the highest inhibiting efficiency, respectively, of 98.0, 95.0, and 90.0% for 10 –2 M. Also, PDP indicated that S1, S2, and S3 inhibitors act as mixed-type inhibitors and their adsorption obeys the Langmuir adsorption isotherm model. Surface tests show that the studied compounds can significantly inhibit acid attack via chemical adsorption on the metal. Furthermore, all of the chemical descriptors derived from DFT indicate that the three inhibitors are quite well adsorbed by the adhesion centers on the CS surface. The three compounds’ molecular geometries and electronic structures were calculated using quantum chemical calculations. Using theoretical computations, the energy difference between the highest occupied molecular orbital and the lowest occupied molecular orbital has been determined to represent chemical reactivity and kinetic stability of a composition.

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Section: Resultssupporting

confidence: 80%

Anticorrosion Effect of Ethoxylate Sulfanilamide Compounds on Carbon Steel in 1 M Hydrochloric Acid: Electrochemical and Theoretical Studies

et al. 2021

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Section: Sem/eds Observationmentioning

confidence: 99%

“…This observation points out the inhibition effect of the NP extract against corrosion. The EDS analysis revealed an increase in oxygen (Table 5), indicating the formation of some oxides covering the metal surface, probably in the form of Fe(OH)2 [6]. Figure 7 shows FTIR and UV-vis spectra of all specimens after being immersed for 10 days in 1M HCl and 1M HCl+NP extract.…”

Section: Sem/eds Observationmentioning

confidence: 99%

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Nephelium lappaceum Extract as an Organic Inhibitor to Control the Corrosion of Carbon Steel Weldment in the Acidic Environment

et al. 2021

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Organic inhibitors have been considered as an effective way to control the corrosion of carbon steel weldment in an acidic environment. This work proposes a new green organic inhibitor made of extract of rambutan fruit (Nephelium lappaceum) peel and aims at analyzing its corrosion inhibitor properties and protection mechanism. Specimens of carbon steel weldment were tested for their corrosion by using electrochemical and immersion methods in 1 M HCl solution containing 0 to 6 g/L of Nephelium peel (NP) extract. Results showed that, in the same solution, the corrosion rate was measured to be higher on the weld metal zone than that of base metal zone, which could be related to the coarser grain of the weld metal zone and the stability of the formed oxide layer. The addition of NP extract was found to increase the stability of the oxide layer, thus increasing the corrosion resistance of the specimens. The maximum inhibition efficiency of the NP extract was reached at 97% for weld metal with 5 g/L of extract, at 80% for the heat affected zone with 5 g/L, and at 70% for base metal with 4 g/L. This work reveals the particularity of different weldment zones to the different needs of inhibitor concentration for obtaining the optimum corrosion protection.

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“…5, the interest of these plots is to clarify the mechanism adopted for the treatment of nyquist diagrams. From Bode plots, we observed two-time constants, which are characterized by the existence of two relaxation processes at the surface of the carbon steel due to the adsorption of PTCa [25,26]. In order to properly analyze the results obtained by the EIS method, we used an equivalent circuit which is schematized in Fig.…”

Section: Electrochemical Impedancementioning

confidence: 99%

Synthesis, Characterization and Evaluation of Apatitic Tricalcium Phosphate as a Corrosion Inhibitor for Carbon Steel in 3 wt% NaCl

et al. 2021

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In this study, we did the synthesis of apatitic tricalcium phosphate, which was characterized by Chemical Analysis, Fourier-Transform Infrared Absorption Spectroscopy and X-Ray Diffraction. The product obtained is apatitic tricalcium phosphate PTCa with the chemical formula Ca 9 (HPO 4 )(PO 4 ) 5 (OH) and a Ca/P ratio equal to 1.5. We evaluated the inhibitory power of PTCa on carbon steel in a NaCl 3 wt% medium by different electrochemical techniques: Stationary polarization, Electrochemical impedance spectroscopy. The results obtained revealed that the apatitic tricalcium leads to a systematic decrease in the kinetics of steel corrosion processes. This decrease depends on the concentration of the compound, the temperature and the immersion time. It reaches 87% for a concentration of 200 ppm. Thermodynamic parameters of the activation process and metal dissolution were calculated and discussed.

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Corrosion Inhibition of Welded of X – 52 Steel Pipelines by Sodium Molybdate in 3.5% NaCl Solution

Cited by 46 publications

References 42 publications

Anticorrosion Effect of Ethoxylate Sulfanilamide Compounds on Carbon Steel in 1 M Hydrochloric Acid: Electrochemical and Theoretical Studies

Anticorrosion Effect of Ethoxylate Sulfanilamide Compounds on Carbon Steel in 1 M Hydrochloric Acid: Electrochemical and Theoretical Studies

Nephelium lappaceum Extract as an Organic Inhibitor to Control the Corrosion of Carbon Steel Weldment in the Acidic Environment

Synthesis, Characterization and Evaluation of Apatitic Tricalcium Phosphate as a Corrosion Inhibitor for Carbon Steel in 3 wt% NaCl

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