Ersin Selçuk ÜNAL, Abdulkadir YAŞAR, İsmail Hakkı KARAHAN

Elektrodepolanmış Nanokompozit Kaplamalarda Elektrolit Bileşenlerinin Etkisi

Bu çalışmada, nikel esaslı alaşım ve nanokompozit kaplamalar elektrokimyasal depolama metodu ilepaslanmaz çelik altlık üzerine üretilmiştir. Watts tipi nikel banyosuna bor kaynağı olarak trimetilamin boran(TMAB) ilave edilerek Ni-B alaşım kaplama elde edilmiş, daha sonra buna ilave olarak banyoya titanyumdiborür (TiB2) seramik nano parçacıkları ilave edilerek nanokompozit kaplama elde edilmiştir. Elektrolitbileşenlerinin kaplama özelliklerine etkilerini incelemek amacıyla elektrokimyasal, mikrosertlik, korozyondayanımı ve yüzey morfolojileri açısından analizler yapılmıştır. Yapılan incelemeler sonucunda her banyobileşeninin morfoloji, sertlik ve korozyon dayanımı gibi özellikleri ciddi miktarda etkilediği görülmektedir.Genel olarak yüzey morfolojiler pürüzsüz olmakla birlikte, nanokompozit kaplamanın yüzeyinin daha kabaolduğu optik resimlerden anlaşılmaktadır. Ana yapıya bor elementi ilavesi mikro sertliği yaklaşık %38oranında artırırken, TiB2 takviyesiyle birlikte saf nikele göre %140, Ni-B alaşımına göre %75 oranındaiyileşme olmasına sebep olmuştur. Bor takviyesi korozyon dayanımını azaltırken, TiB2 takviyesi korozyondayanımında artışa neden olmuştur.

Effect of Electrolyte Components on Electrodeposited Nanocomposite Coatings

In this study, nickel-based alloy and nanocomposite coatings were produced on a stainless steel base with the electrochemical deposition method. Ni-B alloy coating was obtained by adding trimethylamine borane (TMAB) as a boron source to the Watts type nickel bath, and in addition, titanium diboride (TiB2) ceramic nanoparticles were added to the bath in order to obtain a nanocomposite coating. In order to examine the effects of electrolyte components on coating properties, analyzes were carried out in terms of electrochemical, microhardness, corrosion resistance and surface morphology. As a result of the examinations, it was seen that each bath component has a serious effect on the coating properties such as morphology, hardness and corrosion resistance. In general, although surface morphologies were smooth, it was understood from the optical images that the surface of the nanocomposite coating was more coarser. While the addition of boron element to the main structure increased the microhardness by about 38%, with the TiB2 supplement, it caused 140% improvement over pure nickel and 75% improvement over Ni-B alloy. While boron reinforcement reduced corrosion resistance, TiB2 reinforcement caused an increase in corrosion resistance.

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