Modeling the Electrodeposition of Ni/TiC Nanocomposites in the Presence of a Cationic Dispersant

Yıl 2019, Cilt: 24 Sayı: 1, 367 - 382, 30.04.2019

Damla Eroğlu Pala

https://doi.org/10.17482/uumfd.436566

Öz

The electrodeposition of Ni/TiC nanocomposites
on a rotating disk electrode in the presence of a cationic dispersant is
modeled. In the proposed mechanism, TiC nanoparticles are transported through
the diffusion layer, adsorbed on the electrode surface and incorporated into
the growing nickel film if the residence time a particle on the surface exceeds
the burial time. Therefore, TiC incorporation rate is proportional to the residence time and the
total number of particles on the surface, whereas it is inversely proportional
to the burial time. In the model, residence and burial times of a particle are
defined as a function of the current density, hydrodynamics, particle size and
dispersant concentration. And so, TiC incorporation rate and TiC vol% in the deposit
are predicted as a function of TiC and dispersant electrolyte concentrations,
current density, and electrode rotation speed. The model proposes that the
addition of the dispersant increases the TiC amount in the deposit through
increasing the residence time of a particle.

Anahtar Kelimeler

Ni/TiC Nanocomposites, Ni/TiC Co-deposition Mechanism, Electrodeposition, Cationic Dispersant, Electrochemical Modeling

Ni/TiC NANOKOMPOZİTLERİN BİR KATYONİK DİSPERSANT EŞLİĞİNDE ELEKTRODEPOZİSYON MODELİ

Öz

Ni/TiC nanokompozitlerin elektrodepozisyonu dönen disk
elektrot sisteminde, bir katyonik dispersant eşliğinde modellenmiştir. Önerilen
mekanizmada, bir TiC nanoparçacık difüzyon tabakası boyunca taşınır, elektrot
yüzeyine adsorplanır ve yüzeydeki rezidans süresi büyüyen nikel depozite
gömülme süresini geçtiğinde filme inkorpore olur. Dolayısıyla TiC inkorporasyon
hızı, parçacığın yüzeydeki rezidans süresi ve yüzeydeki parçacık miktarıyla
doğru, parçacığın gömülme süresiyle ise ters orantılı olarak tanımlanmıştır.
Modelde rezidans ve gömülme süreleri ise akım yoğunluğu, hidrodinamik koşullar,
parçacık boyutu ve dispersant konsantrasyonuna bağlı olarak ifade edilmiştir.
Buna istinaden, TiC inkorporasyon hızı ve depozitteki TiC hacim%, dispersant ve
TiC elektrolit konsantrasyonları, akım yoğunluğu ve elektrot dönme hızına bağlı
olarak öngörülmüştür. Elektrolite eklenen katyonik dispersantın depozitteki TiC
miktarını arttırması ise dispersantın TiC nanoparçacıkların yüzeydeki rezidans
sürelerini arttırması ile açıklanmıştır. 

Anahtar Kelimeler

Ni/TiC Nanokompozit, Ni/TiC Kodepozisyon Mekanizması, Elektrodepozisyon, Katyonik Dispersant, Elektrokimyasal Modelleme

Kaynakça

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