Evaluation of the inhibitive effect of Diospyros kaki (Persimmon) leaves extract on St37 steel corrosion in acid medium

Gerengi, Hüsnü; Uygur, İlyas; Solomon, Moses M.; Yıldız, Mesut; Göksu, Haydar

doi:10.1016/j.scp.2016.10.003

Cited by 52 publications

(21 citation statements)

References 43 publications

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“…E a can be calculated using Arrhenius Equation 81,82 :where CR stands for the corrosion rate at a temperature (T) which is expressed by the corrosion current density ( i ), E a represents the apparent activation energy and A is the Arrhenius constant that depends on the metal type and electrolyte. R is the universal gas constant (8.314 J mol −1 K −1 ).…”

Section: Resultsmentioning

confidence: 99%

AEO7 Surfactant as an Eco-Friendly Corrosion Inhibitor for Carbon Steel in HCl solution

Sliem

Afifi

Radwan

et al. 2019

Sci Rep

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The impact of AEO7 surfactant on the corrosion inhibition of carbon steel (C-steel) in 0.5 M HCl solution at temperatures between 20 °C and 50 °C was elucidated using weight loss and different electrochemical techniques. The kinetics and thermodynamic parameters of the corrosion and inhibition processes were reported. The corrosion inhibition efficiency (IE%) improved as the concentration of AEO7 increased. In addition, a synergistic effect was observed when a concentration of 1 × 10−3 mol L−1 or higher of potassium iodide (KI) was added to 40 µmol L−1 of the AEO7 inhibitor where the corrosion IE% increased from 87.4% to 99.2%. Also, it was found that the adsorption of AEO7 surfactant on C-steel surface followed the Freundlich isotherm. Furthermore, electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization measurements indicated that AEO7 was physically adsorbed on the steel surface. The surface topography was examined using an optical profilometer, an atomic force microscope (AFM), and a scanning electron-microscope (SEM) coupled with an energy dispersion X-ray (EDX) unit. Quantum chemical calculations based on the density functional theory were performed to understand the relationship between the corrosion IE% and the molecular structure of the AEO7 molecule.

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Section: Resultsmentioning

confidence: 99%

AEO7 Surfactant as an Eco-Friendly Corrosion Inhibitor for Carbon Steel in HCl solution

Sliem

Afifi

Radwan

et al. 2019

Sci Rep

View full text Add to dashboard Cite

show abstract

“…The corresponding electrical equivalent circuits, along with the related fitted parameters for the initial and long-term immersion, are shown in Figure 13a,b, respectively. The fitted parameters include the following factors: R1-solution resistance, R2 and Q1 (capacitor), related to the double layer [19,20], R3 and Q2, corresponding to charge transfer resistance and capacitor, respectively, which are related to the effect of corrosion products and the time constant that appeared in the low frequency region [21,22]. Stress corrosion examination of the printed ER70S-6 and reference ST-37 alloys by slow strain rate testing (SSRT) in 3.5% NaCl solution in terms of UTS and elongation are shown in Figures 14 and 15, respectively.…”

Section: Resultsmentioning

confidence: 99%

Environmental Behavior of Low Carbon Steel Produced by a Wire Arc Additive Manufacturing Process

Ron

Levy

Dolev

et al. 2019

Metals

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: Current additive manufacturing (AM) processes are mainly focused on powder bed technologies, such as electron beam melting (EBM) and selective laser melting (SLM). However, the main disadvantages of such techniques are related to the high cost of metal powder, the degree of energy consumption, and the sizes of the components, that are limited by the size of the printing cell. The aim of the present study was to evaluate the environmental behavior of low carbon steel (ER70S-6) produced by a relatively inexpensive AM process using wire feed arc welding. The mechanical properties were examined by tension testing and hardness measurements, while microstructure was assessed by scanning electron microscopy and X-ray diffraction analysis. General corrosion performance was evaluated by salt spray testing, immersion testing, potentiodynamic polarization analysis, and electrochemical impedance spectroscopy. Stress corrosion performance was characterized in terms of slow strain rate testing (SSRT). All corrosion tests were carried out in 3.5% NaCl solution at room temperature. The results indicated that the general corrosion resistance of wire arc additive manufacturing (WAAM) samples were quite similar to those of the counterpart ST-37 steel and the stress corrosion resistance of both alloys was adequate. Altogether, it was clearly evident that the WAAM process did not encounter any deterioration in corrosion performance compared to its conventional wrought alloy counterpart.

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Section: Am Er70s-6mentioning

confidence: 99%

“…The related electrical equivalent circuit, as well as the fitted parameters, are shown in Figure 6. The fitted parameters were: R1, solution resistance; R2 and C1 represent the double layer [29]; R3 and C2 represent the charge transfer resistance and capacitor [30]. The high cycle fatigue strengths of additively manufactured ER70S-6 alloy and its counterpart ST-37 alloy, in air and in 3.5% NaCl solution, in terms of their S-N curves, are shown in Figure 7a,b.…”

Section: Am Er70s-6mentioning

confidence: 99%

The Effect of Microstructural Imperfections on Corrosion Fatigue of Additively Manufactured ER70S-6 Alloy Produced by Wire Arc Deposition

Ron

Levy

Dolev

et al. 2020

Metals

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This study aims at evaluating the effect of microstructure imperfections on the corrosion fatigue performance of an ER70S-6 alloy produced by wire arc additive manufacturing (WAAM) process, in a 3.5% NaCl solution. For reference, a regular ST-37 alloy with relatively similar chemical composition was considered as a counterpart alloy. This was justified by the fact that the ER70S-6 alloy is usually used for conventional welding of ST-37 steel. The results obtained indicated that while the ST-37 alloy exhibited fatigue strength of 240 MPa in the corrosive solution, the additively manufactured ER70S-6 alloy showed fatigue strength of only 140 MPa. These differences were related to microstructural imperfections that are inherently produced during the WAAM process.

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Evaluation of the inhibitive effect of Diospyros kaki (Persimmon) leaves extract on St37 steel corrosion in acid medium

Cited by 52 publications

References 43 publications

AEO7 Surfactant as an Eco-Friendly Corrosion Inhibitor for Carbon Steel in HCl solution

AEO7 Surfactant as an Eco-Friendly Corrosion Inhibitor for Carbon Steel in HCl solution

Environmental Behavior of Low Carbon Steel Produced by a Wire Arc Additive Manufacturing Process

The Effect of Microstructural Imperfections on Corrosion Fatigue of Additively Manufactured ER70S-6 Alloy Produced by Wire Arc Deposition

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