Corrosion of Cu-Ni Alloys in Sulfide-Polluted Seawater

Alhajji, J. N.; Reda, M. R.

doi:10.5006/1.3316004

Cited by 31 publications

(21 citation statements)

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“…Similar results were obtained for the same alloy in a previous study (0.03 mmpy) at very low concentration of sulphide (0.01 mg/L) [5]. The corrosion rate in the absence of sulphate has been reported as 0.048 mmpy [6], 0.043 mmpy [7], 0.03 mmpy [8], and 0.023 mmpy [9]. G. Kear et al [10] reported that the corrosion rate varied between 0.01 mmpy and 0.24 mmpy.…”

Section: A Tafel Extrapolation and Corrosion Ratessupporting

confidence: 87%

Evaluating Corrosion and Passivation by Electrochemical Techniques

Taher¹

2016

IJMERR

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In this study, the electrochemical techniques used to analyze corrosion behavior and passive films are introduced in detail. These electrochemical techniques include Linear Sweep Voltammetry (LSV), Cyclic Polarization (CP), Cyclic Voltammetry (CV), Tafel Extrapolation (TE), and Electrochemical Impedance Spectroscopy (EIS). The advantages and disadvantages of these techniques are also introduced in this study. As an example to examine the efficiency and performance of these techniques, electrochemical measurements were carried out in a three-electrode system whereby a commercial copper nickel alloy, C70600 was used as the working electrode. These measurements were performed in natural seawater and in artificial saline solutions with different sulphate content. The results obtained from these electrochemical investigations were compared with the results from conventional immersion tests reported in previous studies. The results conclude that these techniques provide a very convenient and efficient way to evaluate the corrosion and passivation processes in both the laboratory and field within a very short time. 

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Section: A Tafel Extrapolation and Corrosion Ratessupporting

confidence: 87%

Evaluating Corrosion and Passivation by Electrochemical Techniques

Taher¹

2016

IJMERR

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“…In researches on the influence of sulfide about corrosion of steel and copper-nickel alloy in 3.5% NaCl and polluted sea water, Hamdy [28] and AI-Hajji [29] found that the existence of sulfide destroyed the passive state of the film on the surface of metals, declined the corrosion potential of the system and accelerated the corrosion of metals. Marcus et al studied the influence of adsorptive sulfur on Ni [30], Fe-17Cr-13Ni [31], and Fe-15Cr-10Ni [32] alloys using electrochemical and radiochemical technology, photoelectron spectrometry, and scanning tunnel microscope, and believed that in active dissolution region adsorptive sulfur played a catalytic role in the process of metal dissolution.…”

Section: Influence Of Sulfide On the Semiconductor Behavior Of Passivmentioning

confidence: 99%

Semiconducting behavior of passive film formed on stainless steel in borate buffer solution containing sulfide

Zhao

et al. 2011

J Appl Electrochem

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The semiconducting behavior of passive film formed on 316L stainless steel in borate buffer solution containing sulfide was studied by capacitance measurements (Mott-Schottky approach), electrochemical impedance spectroscopy and potentio dynamic polarization curves. The results reveal that the measured capacitance values of the stainless steel electrode have frequency dependence and hysteresis, which shows amorphous or highly doped semiconductor property of the passive film. The Mott-Schottky plots indicate p-type semiconducting behavior related to chromium oxide and n-type semiconducting behavior to iron oxide at different potential range of stainless steel electrodes. The existence of sulfide in the solution increases the acceptor densities obviously which increase more than five times with the sulfide concentration of 9 mg L -1 and enables a more conductive behavior. The presence of sulfide also decreases the impedance values and enlarges the passive current of the electrode.

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“…Al-Hajji et al also reported the same negative effect of Cr addition to steels in a sour brine solution (pH 4.25). 51) In addition, other studies indicated that Cr addition to steels increased the rates of dissolution in hydrochloric acid and other acidic environments. 52,53) The over-alloying circumstance of Cr leads to steel deterioration in acidchloride solution due to the hydrolysis of metal chlorides.…”

Section: )mentioning

confidence: 99%

“…50) Cupric hydroxide Cu(OH) 2 has been reported to be less stable than cupric oxide CuO. 51) Figure 10(c) shows that the addition of 0.5 mass% Cr considerably reduced the intensity of the Fe peak, indicating that over-alloying circumstance dramatically dissolved the beneficial Fe compounds on the protective film of 0.5 mass% Cr steel, thereby increasing the corrosion rate of the 0.5 mass% Cr steel compared to that of the other steels.…”

Section: Surface Analysismentioning

confidence: 99%

Alloying Effect of Chromium on the Corrosion Behavior of Low-Alloy Steels

Park

Kim

2013

Mater. Trans.

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Alloying effect of Cr in the interaction with other elements in low alloy steel for corrosion resistance was designed and prepared. The corrosion behavior of the alloy immersed in mild acidchloride solution (200 atomic ppm Cl ¹ and pH 4) at room temperature in an ambient condition has been studied by electrochemical laboratory tests (potentiodynamic polarization test, potentiostatic test, electrochemical impedance spectroscopy) and surface analyses (SEM, XPS). The results reveal that Cr addition improved the localized corrosion resistance by promoting the formation of beneficial Fe and Cu compounds on the protective films of 0.1 and 0.3 mass% Cr steels. However, the over-alloying circumstance in 0.5 mass% Cr steel caused the negative effect of Cr addition due to metal chloride-induced hydrolysis which accelerated the propagation of the localized corrosion. To summarize, 0.3 mass% Cr addition was determined to be the optimum value for alloying to blank steel.

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Corrosion of Cu-Ni Alloys in Sulfide-Polluted Seawater

Cited by 31 publications

References 0 publications

Evaluating Corrosion and Passivation by Electrochemical Techniques

Evaluating Corrosion and Passivation by Electrochemical Techniques

Semiconducting behavior of passive film formed on stainless steel in borate buffer solution containing sulfide

Alloying Effect of Chromium on the Corrosion Behavior of Low-Alloy Steels

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