Effect of sulfide pollution on the stability of Cu–Al–5Ni alloy in 3.5% NaCl solution

El-Sayed, Nady Hashem; El-Rabiei, M.M.

doi:10.1016/j.ejpe.2014.05.002

Cited by 5 publications

(3 citation statements)

References 29 publications

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“…The results imply that the uniform corrosion of aluminum increases with increasing the S 2− ion concentrations without any sign for pitting corrosion within the studied polarization range. Mechanism of the uniform corrosion of aluminum in S 2− solution can be summarized as previously reported 8,32–34 , S 2− ions is hydrogenated to give HS − , that reacts with aluminum to produces Al 2 S 3 and finally Al 2 O 3 according to the following equations:…”

Section: Resultsmentioning

confidence: 94%

“…Sulphide polluted saline solutions are very aggressive medium for the corrosion of many metals, that used in many industrial installations processing sulfides. Corrosion behaviour of Cu-Al-5Ni alloy in 3.5 wt% NaCl solution containing different concentrations of sulphide ions was studied using electrochemical impedance spectroscopy measurements 8 . Data showed that, increasing the sulpide ion concentrations leads to increase the corrosion rate of this alloy that can be explained on the basis of the presence of Cu 2 S that decrease the protective efficiencies of Cu 2 O film.…”

Section: Introductionmentioning

confidence: 99%

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Role of S2− ions on the microstructure change and the pitting behaviour of aluminum in saline solution

El-Deeb

2019

Sci Rep

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The electrochemical behaviour and the passive film microstructure of aluminum during its exposure to 3.5 wt% NaCl solution in the absence and presence of S 2− ions are investigated using potentiodynamic polarization curves, electrochemical impedance spectroscopy measurements, XRD, XRF, SEM and AFM. Electrochemical measurements show that the presence of S 2− ions enhances the uniform corrosion of aluminum in NaCl solution, but delay its susceptibility to the pitting corrosion. In addition, EIS analysis illustrate that the formation of more compact and protective passive layer in the presence of S 2− ions compared to its rough surface in the absence of S 2− ions as evidenced by the lower value of constant phase element ( CPE ) and higher value of phase shift ( N ). Cracks, non- homogenous and open large pits with high degree of roughness are clearly observed on the aluminum surface in the absence of S 2− ions, compared to oriented grooves, elongated ridges with the accumulation of the corrosion products inside the pits in the presence of S 2− ions. The inhibitory effect of S 2− ions for the pitting corrosion of aluminum is interpreted on the basis of the change in its microstructure of the passive film in the absence and presence of S 2− ions.

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Section: Resultsmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Role of S2− ions on the microstructure change and the pitting behaviour of aluminum in saline solution

El-Deeb

2019

Sci Rep

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“…To represent the capacity elements taking into account the deviations of system from the ideality due to surface heterogeneities and other possible reasons, pure capacity C is replaced by Q [21]. The oxide pseudocapacitance C op is adopted for evaluation of non-ideal surface oxide capacitance using the expression supported by ZSimpWin software [18]: It can be seen that all the Nyquist plots present only one high frequency capacitive loop and the diameters of half semicircles for Gd-based BMG increase with the increasing superheat temperature and reaches the largest at 1105℃, which suggests an increase in the charge-transfer resistance or the oxide film resistance [23,24]. The fitting parameters deduced from the fitting circuit and the parameter C op obtained from the above equation with the elements comprising the circuit are summarized in Table 2.…”

Section: Tablementioning

confidence: 99%

Influence of melt superheat treatment on corrosion resistance of Gd-based BMG in 3.5% NaCl solution

et al. 2016

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Gd 55 Al 25 Cu 10 Co 10 bulk metallic glass (BMG) was prepared by copper mold blow casting method with different superheat temperatures. Polarization tests, electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) measurements were used to study the influence of superheat treatment on corrosion resistance of Gd 55 Al 25 Cu 10 Co 10 in 3.5% NaCl solution at room temperature. The potentiodynamic polarization analysis shows that the corrosion resistance ability of Gd-based BMG after superheat treatment at different superheat temperatures ranks: 1105℃>1214℃>1066℃>919℃, which agrees well with that of EIS data. In addition, the SEM results reveal that the corrosion products gradually become more uniform for Gd-based BMG at higher superheat temperature and exhibits the best at 1105℃, which shows better corrosion resistance ability. Also, it is interesting that there exists no corrosion pits for all Gd-based BMG. The EDS and XPS results reveal that corrosion resistance has a positive relation with highly corrosion-resistance oxides of corrosion products. It is also found that corrosion resistance ability is in accordance with glass-forming ability (GFA). All these results are considered to be related to the more uniform and homogeneous microstructure after superheat treatment with the increasing superheat temperature.

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Semiconducting behavior of pure copper in alkaline solutions

Fattah‐alhosseini

Keshavarz

Masomi

et al. 2015

Egyptian Journal of Petroleum

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Effect of sulfide pollution on the stability of Cu–Al–5Ni alloy in 3.5% NaCl solution

Cited by 5 publications

References 29 publications

Role of S2− ions on the microstructure change and the pitting behaviour of aluminum in saline solution

Role of S2− ions on the microstructure change and the pitting behaviour of aluminum in saline solution

Influence of melt superheat treatment on corrosion resistance of Gd-based BMG in 3.5% NaCl solution

Semiconducting behavior of pure copper in alkaline solutions

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