Evolution of corrosion resistance and passive film properties of Ni-Mo alloy coatings during exposure to 0.5 M NaCl solution

The corrosion properties of Ni-Mo alloy coatings with different molybdenum content (11-32 wt%) were investigated in the course of exposure to 0.5 M NaCl solution. Polarization resistance and impedance measurements showed that after contact with corrosive media, the formation of passive film on the c...

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Bibliographic Details
Published in:Surface & coatings technology 2017-05, Vol.317, p.26-37
Main Authors: Laszczyńska, A., Tylus, W., Winiarski, J., Szczygieł, I.
Format: Article
Language:English
Subjects:
Alloys
Corrosion resistance
Corrosion resistant alloys
Exposure
Film growth
Molybdenum base alloys
Nickel base alloys
Protective coatings
Sodium chloride
X ray photoelectron spectroscopy
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Summary:The corrosion properties of Ni-Mo alloy coatings with different molybdenum content (11-32 wt%) were investigated in the course of exposure to 0.5 M NaCl solution. Polarization resistance and impedance measurements showed that after contact with corrosive media, the formation of passive film on the coating surface, determines the corrosion resistance of Ni-Mo alloys. XPS analysis revealed that, the passive film growth was enhanced by the presence of higher amounts (26-28 wt%) of Mo in the coating. It was found, that after exposure to corrosive solution, Mo oxides occurred at the passive film/metal interface, while Ni hydroxide dominated in the bulk of the passive film.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2017.03.043