The effect of current types on the microstructure and corrosion properties of Ni/NANOAl2O3 composite coatings
PBN-AR
Instytucja
Wydział Inżynierii Materiałowej (Politechnika Warszawska)
Źródłowe zdarzenia ewaluacyjne
Informacje podstawowe
Główny język publikacji
en
Czasopismo
Materiali in Tehnologije (15pkt w roku publikacji)
ISSN
1580-2949
EISSN
Wydawca
DOI
URL
Rok publikacji
2017
Numer zeszytu
3
Strony od-do
403-411
Numer tomu
51
Identyfikator DOI
Liczba arkuszy
0.5
Słowa kluczowe
en
Corrosion resistance
Nanocomposites
Ni/Al2O3 coatings
Pulse electrodeposition
Streszczenia
Język
en
Treść
Nickel matrix composite coatings with a ceramic disperse phase have been widely investigated due to their enhanced properties, such as higher hardness and wear resistance in comparison to pure nickel. This paper describes the research on nickel and nickel-alumina coatings. The coatings were obtained from a Watts bath with the presence of nickel grain-growth inhibitors by DC (direct current), PC (pulse current) and PRC (pulsed reverse current) plating. The study includes the composite coatings of microcrystalline and nanocrystalline Ni matrix and nanometric Al2O3 particles. In order to ensure uniform co-embedding of the disperse phase particles with a nickel matrix and producing a stable suspension, mechanical agitation was also used. It was proved in our previous investigations that mechanical agitation is the best way of embedding nano-alumina particles in a nickel matrix. The effect of the electroplating techniques on the microstructure (SEM - scanning electron microscopy, STEM - scanning transmission electron microscopy, XRD - X-ray diffraction, surface profile) of Ni and Ni/Al2O3 composite coatings was investigated. In order to evaluate the corrosion resistance of the produced coatings, the corrosion studies were carried out by electrochemical impedance spectroscopy and the potentiodynamic method in a 0.5-M NaCl solution. Bode diagrams obtained by impedance spectroscopy method were established. The equivalent electric circuit and its parameters were determined to interpret impedance spectra. The corrosion current and corrosion potential were determined. Investigations of the corrosion damage to the produced surface layers were performed by scanning microscope techniques. The completed studies have shown that the type of current significantly affects the structure of the nickel and composite coatings, as well as their corrosion properties.‬‬‬‬
Inne
System-identifier
WUT2eee4ffd086049f682f3ec625930cfff
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