期刊
COATINGS
卷 9, 期 4, 页码 -出版社
MDPI
DOI: 10.3390/coatings9040226
关键词
amorphous; nanocrystalline coating; electrochemical corrosion; passive film; EIS; corrosion experiments
资金
- National Key R&D Program of China [2017YFB0306100]
- Guangdong Provincial Science and Technology Project [2014B070705007, 2017A070702016]
- Guangzhou City Science and Technology Planning Project [201707010384]
- GDAS Project of Science and Technology Development [2018GDASCX-0402]
In this study, FeCrMnWMoSi amorphous/nanocrystalline coating was prepared on stainless steel by high-velocity oxygen fuel (HVOF) spraying. In order to thoroughly evaluate this novel material, the corrosion behaviors and corrosive film characteristics of the amorphous/nanocrystalline coating in NaCl corrosive media were studied using electrochemical measurement technologies such as potentiodynamic polarization curves and electrochemical impedance spectroscopy (EIS). It was found that the corrosion resistance of Fe-based amorphous/nanocrystalline coating could be attributed to the passive film formed, which consisted of Fe, Cr, Mo, and W oxides. pH has an important influence on the corrosion resistance of amorphous/nanocrystalline coating by changing the pitting corrosion mechanism. Under neutral and acidic conditions, the corrosion mechanism of Fe-based amorphous/nanocrystalline coating was mainly local pitting corrosion. However, under strong alkaline conditions, the amorphous/nanocrystalline coating not only had pitting corrosion, but also had the active dissolution of the passive film. Therefore, the anti-corrosion performance of Fe-based amorphous/nanocrystalline coating under alkaline conditions was not as good as neutral and acidic corrosive medium.
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