An electrochemical study on the inhibiting action of some organic phosphonium compounds on the corrosion of mild steel in aerated acid solutions

Morad, M. S.

doi:10.1016/s0010-938x(99)00138-9

Cited by 179 publications

(47 citation statements)

References 18 publications

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“…The shapes of the curves are quite similar and mainly consist of a large capacitive loop at higher frequencies. Similar impedance plots have been reported in the literature for the corrosion of iron [24][25][26][27][28][29][30].…”

Section: Electrochemical Impedance Spectroscopysupporting

confidence: 86%

“…The impedance spectra were recorded and displayed as Nyquist plots ( Figure 7). As can be seen, the impedance diagrams show semicircles, indicating that the corrosion process is mainly charge transfer controlled [24,25] The depressed semicircles of the Nyquist plots suggest the distribution of capacitance is due to inhomogeneous metal surface [26][27][28][29][30]. The shapes of the curves are quite similar and mainly consist of a large capacitive loop at higher frequencies.…”

Section: Electrochemical Impedance Spectroscopymentioning

confidence: 88%

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Investigations on the corrosion of constructional steels in different aqueous and simulated atmospheric environments

Gassama¹,

Diagne²,

Yade³

et al. 2015

Bull. Chem. Soc. Eth.

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ABSTRACT. The corrosion behavior of three constructional steels used in Senegal, S235, S275 and S355, was studied in simulated atmospheric conditions in an exposure chamber above distilled water and above 3% NaCl solution representing marine atmosphere by comparing the ratio of rusted to unrusted area. Electrochemical test methods (potentiodynamic tests and electrochemical impedance spectroscopy) were employed to study the steels fully immersed in acidic, near neutral and basic conditions in 0.5 M HCl, NaCl, and NaOH solutions, respectively. Results indicate that S355 and S235 steels have comparable corrosion resistance, which are much lower than that of S275.

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Section: Electrochemical Impedance Spectroscopysupporting

confidence: 86%

Section: Electrochemical Impedance Spectroscopymentioning

confidence: 88%

Investigations on the corrosion of constructional steels in different aqueous and simulated atmospheric environments

Gassama¹,

Diagne²,

Yade³

et al. 2015

Bull. Chem. Soc. Eth.

View full text Add to dashboard Cite

show abstract

“…Figure 8. Such an equivalent circuit was also discussed by several researchers, who obtained similar depressed semicircles with single time constant due to surface heterogeneity of corrosion product covering the surface at random sites [31][32][33]. The chargetransfer resistance ( ct ) values were calculated from the difference in impedance at low and high frequencies.…”

Section: Potentiodynamic Polarization Measurementsmentioning

confidence: 87%

Inhibition Effect of Substituted Thiadiazoles on Corrosion Activity of N80 Steel in HCl Solution

Yadav

Kumar

Behera

2013

Journal of Metallurgy

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The inhibition effect of some prepared compounds, namely, thiadiazole derivatives, on N80 steel corrosion in 15% HCl solutions has been studied by using the weight loss, electrochemical polarization, and electrochemical impedance spectroscopy techniques. It was found that the inhibition efficiency of the thiadiazole derivatives, namely, 2-amino-5-(4-methoxyphenyl)-1,3,4-thiazole (AMPT), 2-amino-5-phenyl-1,3,4-thiazole (APT), and 2-amino-5-(4-chlorophenyl)-1,3,4-thiazole (ACPT), increases with the increase in concentration. Inhibition efficiency follows the order AMPT > APT > ACPT. The effect of temperature on the corrosion was investigated by the weight loss method, and some thermodynamic parameters were calculated. The inhibitive action may be attributed to the adsorption of inhibitor molecules on the active sites of the metal surface following Langmuir adsorption isotherm. Polarization measurements indicated that thiadiazole derivatives act as mixed-type corrosion inhibitor. The adsorption of thiadiazole derivatives on N80 surface exposed to inhibitor-containing solutions was confirmed using SEM and FT-IR spectra.

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“…Similar depressed semicircles were obtained with a single time constant, due to the surface heterogeneity of the corrosion product covering the surface at random sites [11][12][13][14] . The corresponding Bode plots are shown in Figure 3a.…”

Section: Electrochemical Impedance Spectroscopy (Eis)supporting

confidence: 69%

“…A schematic presentation of the heat treatment schedule consisting of the hardening, deep cryogenic treatment and tempering cycles of the samples. [11][12][13][14] . The corresponding Bode plots are shown in Figure 3a.…”

Section: Electrochemical Impedance Spectroscopy (Eis)mentioning

confidence: 99%

The Effects of Cryogenic Treatment on the Corrosion of AISI D3 Steel

et al. 2015

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It is well known that cryogenic treatment is used to improve the mechanical properties of a material. Consequently, the use of cryogenic treatment has grown beyond its successful application on tool steels. In this research, the effects of cryogenic treatment on the corrosion of AISI D3 steel in 3.5% NaCl solution were examined by electrochemical impedance spectroscopy (EIS). The surface structure of the AISI D3 steel was examined by scanning electron microscopy (SEM) after the EIS investigations. Results clearly indicated that the pre-treatment of the steel was responsible for a significant effect on corrosion. The heat treatment process prior to the cryogenic treatment and the tempering process after were shown to decrease corrosion resistance. Uygur et al. 570 Materials Research Keywords: corrosion, cryogenic treatment, electrochemical impedance spectroscopy, AISI D3 steel Material and MethodsElectrochemical measurements were carried out in a three-electrode type cell with separate compartments for the reference electrode (Ag/AgCl), the counter (Pt) and the working (AISI D3 steel) electrodes having an area of 0.5 cm². The surfaces of the working electrode were prepared by grinding with 400-1800 grade abrasive paper, rinsing with distilled water and then degreasing with acetone. During the measurements, the solution was stirred with a magnetic stirrer (500 rot/min). The composition of AISI D3 steel is given in Table 1.Four types of uncoated AISI D3 steel samples were used: conventionally heat treated, 24 h cryogenically treated, 36 h cryogenically treated and 36 h cryogenically treated and then 2 h tempered at 150 °C. The cryogenic treatment for the AISI D3 samples was achieved by gradually lowering them from room temperature to -145 °C at the cooling rate of about 5 °C/min and holding at this cryogenic temperature for 24 h or 36 h, then gradually bringing them back to room temperature at the heating rate of 5 °C/min. The scheme in Figure 1 shows the various treatments and treatment cycles applied to the samples. The tempering of the AISI D3 steel was performed in a muffle furnace with the capacity of 9 kW, 380 V and 1200 °C.After the AISI D3 steel samples were prepared as described above (Figure 1), their corrosion behaviour in a 3.5% NaCl medium was then examined. For the investigation, abridged labels were used for the AISI D3 steel sample qualifications (Table 2). Thus, the following discussion will be made easier by referring to these codes. Electrochemical measurementsThe electrochemical impedance spectroscopy (EIS) measurements were performed using a Reference 600 Gamry Potentiostat/Galvanostat/ZRA (M/S Gamry Instruments, USA). Before EIS measurement, each sample was immersed in the corrosion cell and allowed to stabilise for 2 h. The EIS studies were performed by imposing a sinusoidal voltage of 10 mV amplitude as the open circuit potential of the working electrode. The frequency was varied between 100 kHz and 1 mHz. Surface morphology studiesAfter the EIS measurements, surface analyses of the worki...

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An electrochemical study on the inhibiting action of some organic phosphonium compounds on the corrosion of mild steel in aerated acid solutions

Cited by 179 publications

References 18 publications

Investigations on the corrosion of constructional steels in different aqueous and simulated atmospheric environments

Investigations on the corrosion of constructional steels in different aqueous and simulated atmospheric environments

Inhibition Effect of Substituted Thiadiazoles on Corrosion Activity of N80 Steel in HCl Solution

The Effects of Cryogenic Treatment on the Corrosion of AISI D3 Steel

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