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Naji, M. |
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Motta, Antonella |
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Aletan, Dirar |
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Mohamed, Tarek |
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Ertürk, Emre |
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Taccardi, Nicola |
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Petrov, R. H. | Madrid |
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Alshaaer, Mazen | Brussels |
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Bih, L. |
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Casati, R. |
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Kočí, Jan | Prague |
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Kalteremidou, Kalliopi-Artemi | Brussels |
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Azam, Siraj |
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Ospanova, Alyiya |
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Blanpain, Bart |
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Ali, M. A. |
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Popa, V. |
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Rančić, M. |
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Ollier, Nadège |
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Azevedo, Nuno Monteiro |
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Landes, Michael |
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Rignanese, Gian-Marco |
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Szczygiel, B.
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article
The study on the corrosion mechanism of protective ternary Zn-Fe-Mo alloy coatings deposited on carbon steel in 0.5 mol dm(-3) NaCl solution
Abstract
<p>The passive layer on Zn–Fe–Mo coating (7.6 at.% Fe, 1.6 at.% Mo) became damaged in 0.5 M NaCl solution, as shown in ionic current density maps that were observed during 10 h of exposure. The ZnO and Zn(OH)<sub>2</sub> slowly transformed into Zn<sub>5</sub>(OH)<sub>6</sub>(CO<sub>3</sub>)<sub>2</sub> and Zn<sub>5</sub>(OH)<sub>8</sub>Cl<sub>2</sub>·H<sub>2</sub>O. At the same time, MoO<sub>2</sub> transformed to MoO<sub>3</sub> and MoO(OH)<sub>2</sub>. The barrier properties of the layer of corrosion products deteriorated so the charge transfer resistance decreased from 13 to 7.4 kΩ cm<sup>2</sup> and the double layer capacitance increased from 4.5 to 62 μF cm<sup>–2</sup> after 0.5 h and 10 h exposure, respectively.</p>