Effect of temperature variation on the corrosion behaviour and semiconducting properties of the passive film formed on chromium oxide coatings exposed to saline solution

Oje, A.M.; Ogwu, A. A.; Rahman, Saeed Ur; Oje, Alex I.; Tsendzughul, Nathaniel

doi:10.1016/j.corsci.2019.04.004

Cited by 52 publications

(16 citation statements)

References 45 publications

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“…The equivalent circuit model in Figure 8 a (1) is used to analyze the corrosion behavior of SS316L. This model has been widely used by researchers before [ 47 ]. The corrosion resistance of two-time constant coatings is commonly described by graph (2) in Figure 8 a [ 16 ].…”

Section: Resultsmentioning

confidence: 99%

Study on Corrosion Resistance and Conductivity of TiMoN Coatings with Different Mo Contents under Simulated PEMFC Cathode Environment

et al. 2022

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TiMoN coatings with different Mo contents on a SS316L substrate are deposited by using closed field unbalanced magnetron sputtering ion plating (CFUMSIP) technology to enhance the corrosion resistance and durability of stainless steel (SS) bipolar plates (BPs) in proton exchange membrane fuel cell (PEMFC) during the start-up/shut-down process. The electrochemical test results illustrate that TiMoN-4A coating has extremely good corrosion resistance compared to other coatings. The potentiostat polarization (+0.6 VSCE) tests indicate that the corrosion current density (Icorr) of TiMoN-4A coating is 5.22 × 10−7A cm−2, which meets the department of energy 2020 targets (DOE, ≤1 × 10−6 A cm−2). Otherwise, TiMoN-4A coating also exhibits the best corrosion resistance and stability in potentiostatic polarization, electrochemical impedance spectroscopy (EIS), and high potential (+1.2VSCE) polarization tests. The interfacial contact resistance (ICR) measurement results show that TiMoN-4A coating has the minimum ICR of 9.19 mΩ·cm2, which meets the DOE 2020 targets (≤10 mΩ·cm2).

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Section: Resultsmentioning

confidence: 99%

Study on Corrosion Resistance and Conductivity of TiMoN Coatings with Different Mo Contents under Simulated PEMFC Cathode Environment

et al. 2022

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“…The EIS coating plots were simulated by the equivalent circuit models shown in Figure 5. Figure 5a shows the equivalent circuit model has been previously used in different studies to fit the EIS data of ceramic coatings deposited by thermal spray and tested in chloride solutions [7], [15], [27]. The model consists of the solution resistance (R sol ), the pore resistance (R pore ), the charge transfer resistance (R c ) and constant phase elements (CPE 1 and CPE 2 ).…”

Section: Electrochemical Corrosion Tests 231 Eis Analysis At Differen...mentioning

confidence: 99%

“…This parameter is proportional to the protective capacity of the coatings. CPE 1 and CPE 2 are described as an imperfect capacitor and depict the electrolyte-coating and coating-substrate interface, respectively [15], [28]. Equally, simple equivalent circuits were fitted to the carbon steel (CS) experimental data to achieve the polarization resistance (R P ), as shown in Figure 5b.…”

Section: Electrochemical Corrosion Tests 231 Eis Analysis At Differen...mentioning

confidence: 99%

“…Where j is the imaginary unit, Q is the CPE constant, ω is the angular frequency (rad/s) and α is the CPE exponent index [15], [28], [29]. This equation can describe the impedance of a pure capacitor C for a Q=C condition and exponent α =1.…”

Section: Electrochemical Corrosion Tests 231 Eis Analysis At Differen...mentioning

confidence: 99%

“…These defects provide a way for aggressive ions to diffuse through the coating and reach the substrate, impairing the coating performance [7], [8]. Chromium oxide (Cr 2 O 3 ) coatings have been evaluated as possible protective ceramic coatings for different substrates and these have been found to enhance their corrosion and wear properties [15]. Furthermore, Cr 2 O 3 coatings exhibit an excellent protective capacity on metal exposed to acid and high chloride concentration environments [16].…”

Section: Introductionmentioning

confidence: 99%

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Corrosion Behavior of Flame Sprayed Cr2O3 Coatings on Carbon Steel in Chloride Solutions

Celis

Ortiz

́ández

2022

rev.ing.univ.Medellin

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Cr2O3 coatings were deposited on carbon steel through the flame spraying technique using two types of flames (neutral and oxidizing). The protective and morphological characteristics of the coatings were determined. The coatings had layer thickness values of 114 and 214µm for oxidizing and neutral samples, respectively. Porosity percentages of 4.5 % and 2.5 % were determined, where the neutral sample presented the greatest porosity due to the insufficient fusion of the oxide particles during the process, resulting in the formation of a heterogeneous and less compact layer. Microcracks and pores were found on the surface and cross-section of the coatings, due to the thermal expansion generated during the solidification process. The coating protective capacity was evaluated by electrochemical techniques over 672 hours in a 3.5 %wt NaCl saline solution. The results evidenced that the coatings manufactured with the oxidizing flame presented more corrosion resistance compared to those prepared with the neutral flame. The corrosion products were more evident in the neutral flame coatings, because of the diffusion mechanisms from the substrate to the surface coating through the interconnected pores. Finally, the wettability of the sodium chloride solution in the Cr2O3 coatings was measured by the contact angle technique, finding that the oxidizing flame coatings exhibited a higher angle contact value (64.8°) in contrast to the neutral flame coatings (35°).

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An evaluation of Acacia mearnsii tannin as an aluminum corrosion inhibitor in acid, alkaline, and neutral media

Rodrigues

Dalmoro

Santos

2020

Materials & Corrosion

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The electrochemical behavior of aluminum in tannin from Acacia mearnsii bark was evaluated by potentiodynamic polarization curves and electrochemical impedance spectroscopy (EIS) in media under three different pH conditions: acid, alkaline, and neutral. A relationship among pH, polymerization grade (PG), zeta potential, surface, and electrochemical properties was observed in the inhibition performance of the tannin. At high pH, the oligomer structure of the tannin was affected, resulting in a low PG (4) and high zeta potential (−75 mV), and consequently, the inhibition efficiency decreased (68%) in comparison with that in acid (99%) and neutral media (96%). The values obtained indicate a physisorption mechanism for the aluminum corrosion inhibition in the studied conditions.

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Effect of temperature variation on the corrosion behaviour and semiconducting properties of the passive film formed on chromium oxide coatings exposed to saline solution

Cited by 52 publications

References 45 publications

Study on Corrosion Resistance and Conductivity of TiMoN Coatings with Different Mo Contents under Simulated PEMFC Cathode Environment

Study on Corrosion Resistance and Conductivity of TiMoN Coatings with Different Mo Contents under Simulated PEMFC Cathode Environment

Corrosion Behavior of Flame Sprayed Cr2O3 Coatings on Carbon Steel in Chloride Solutions

An evaluation of Acacia mearnsii tannin as an aluminum corrosion inhibitor in acid, alkaline, and neutral media

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