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Hybrid nanocomposite layers Ni/Al2O3/C graphite produced by electrocrystallization method

Bartoszek W., Trzaska M.

Archives of Metallurgy and Materials

2019

Vol. 64, iss. 1

167--173

The paper presents the results of studies of hybrid composite layers Ni/Al2O3/Cgraphite produced by the electrodeposition method. Three variants of hybrid composite layers were prepared in electrolyte solutions with the same amounts of each dispersion phases which were equal to 0.25; 0.50 and 0.75 g/dm3. The structure of Ni/Al2O3/Cgraphite layers as well as the Al2O3 and graphite powders, which were used as dispersion phases was investigated. The results of morphology and surface topography of produced layers are presented. The modulus of elasticity and microhardness of the material of produced layers were determined by DSI method. Tribological and corrosion resistance tests of produced layers were carried out. Realized studies have shown that the material of the produced layers is characterized by a nanocrystalline structure. Incorporation of dispersion phases into the nickiel matrix increases the degree of surface development of layers. Ni/Al2O3/Cgraphite layers are characterized by high hardness and abrasion resistance by friction, furthermore, they provide good corrosion protection for the substrate material.

Corrosion properties of Ni/Al2O3/Cgraphite hybrid composite layers

Bartoszek W., Cieślak G., Skroban K., Mazurek A., Trzaska M.

Ochrona przed Korozją

2018

nr 2

36--39

The paper presents the results of studies of composite layers with nickel matrix and dispersed phase in the form of: alumina oxide (Al2O3) and graphite (Cgraphite) produced by electrodeposition on steel substrate. Three variants of composite layers were produced: Ni/Al2O3, Ni/Cgraphite, Ni/Al2O3/Cgraphite and for comparison purpose a nickel layer was also produced. Alumina oxide and graphite powders were used as dispersion phases. The dispersed phases were characterized by scanning electron microscopy (SEM) and Raman spectroscopy for graphite powder. The results of investigations of the structures of the produced layers with SEM, EDS, and results of Vickers hardness measurements as well as results of corrosion tests using electrochemical potentiodynamic method are presented. Damage characteristics after corrosion studies were obtained using a light microscope.

W pracy przedstawiono wyniki badań warstw kompozytowych z niklową osnową oraz wbudowanymi w nią cząstkami faz dyspersyjnych w postaci: tlenku glinu (Al2O3) oraz grafitu (C grafit) wytwarzanych w procesie elektroosadzania na podłożu stalowym. Wytworzono trzy warianty powłok kompozytowych: Ni/Al2O3, Ni/C grafit, kompozytową warstwę hybrydową Ni/Al2O3/C grafit oraz w celach porównawczych warstwę niklową. Jako fazy dyspersyjne stosowano proszki Al2O3 oraz grafitu rozproszone w kąpieli Wattsa. Charakterystykę faz dyspersyjnych realizowano za pomocą skaningowej mikroskopii elektronowej (SEM) oraz spektroskopii Ramana dla proszku grafitu. Przedstawiono wyniki badań struktury oraz składu chemicznego wytworzonych warstw za pomocą SEM z przystawką EDS, wyniki pomiarów twardości metodą Vickersa, a także wyniki badań korozyjnych za pomocą elektrochemicznej metody potencjodynamicznej. Charakterystykę zniszczeń po badaniach korozyjnych dokonano za pomocą mikroskopu świetlnego.