The effect of co-electrodeposited ZrO2 particles on the microstructure and corrosion resistance of Ni coatings

Field-enhanced co-electrodeposition of zirconia particles with a magnetic shell during Ni electrodeposition

“…4a) which can be confirmed with EDX measurement results (weight percent of Zr element in Table 1). EDX measurements in previous works for ordinary Ni-ZrO 2 composite coating (produced without applied magnetic field) show that the application of magnetic field of 0.05 T has no appreciable effect on the amount of incorporated ZrO 2 particles in Ni deposit (weight percent of Zr element in the coating was 15.56 for ordinary Ni-ZrO 2 produced in a bath containing 90 g·l −1 zirconia powder [26,27,29]). These studies show that the application of a magnetic field of 0.05 T in electroplating of Ni-NCZ results in more coelectrodeposition of NCZ particles but such a magnetic field has no appreciable effect on the amount of incorporated ZrO 2 particles in Ni-ZrO 2 .…”

“…For higher accuracy, chemical composition of the coating was examined using energy dispersive X-ray spectroscopy. Ni-ZrO 2 and Ni-NCZ composite coatings were electroplated in a Watts bath with the composition reported in previous works [26,27] in an applied magnetic field of 0.05 T perpendicular to the cathode surface. 90 g·l −1 ZrO 2 and 70 g·l −1 NCZ powders were dispersed in the baths to produce Ni-ZrO 2 and Ni-NCZ composite coatings respectively.…”

“…In previous works [26][27][28], it has been shown that the microhardness and corrosion resistance of Ni deposit increase with co-electrodeposition of ZrO 2 particles but the property modification is limited due to the limited amount of incorporated particles which can be achieved. In another work [29], it has been illustrated that using electroless nickel coated ZrO 2 particles (NCZ particles) instead of ZrO 2 in co-electrodeposition of Ni-ZrO 2 composite coating causes higher microhardness and corrosion resistance.…”

Microstructure and Properties of Ni and Ni/Al2O3 Coatings Electrodeposited at Various Current Densities

“…Incorporating more oxide particles in the deposits induces a higher resistance against the corrosion of these layers. The α-Al 2 O 3 particles co-deposited with the nickel are new nucleation sites for Ni grains and they change the microstructure of nickel from coarse-grained columnar to fine-grained granular structure, so that corrosion can only proceed along less straight paths due to changing of grain boundaries [16]. Also, α-Al 2 O 3 particles act as inert physical barriers to the initiation and development of corrosion which contributes to isolating corrosive medium, decreasing corrosive area and increasing corrosion resistance.…”

Incorporation and evolution of ZrO2 nano-particles in Pt-modified aluminide coating for high temperature applications

“…The present work investigated the REEs by adding ZrO2 nanoparticles into PtAl coatings in order to improve thermal cycling performance. Incorporation of ZrO2 particles in Pt coating (Pt-ZrO2) was achieved by co-electrodeposition [23]. ZrO2 modified PtAl coatings (ZrO2-PtAl) were evaluated using thermal cyclic oxidation tests.…”