Elektrodepolanmış Nanokompozit Kaplamalarda Elektrolit Bileşenlerinin Etkisi

Öz

Bu çalışmada, nikel esaslı alaşım ve nanokompozit kaplamalar elektrokimyasal depolama metodu ile paslanmaz 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 titanyum diborür (TiB2) seramik nano parçacıkları ilave edilerek nanokompozit kaplama elde edilmiştir. Elektrolit bileşenlerinin kaplama özelliklerine etkilerini incelemek amacıyla elektrokimyasal, mikrosertlik, korozyon dayanımı ve yüzey morfolojileri açısından analizler yapılmıştır. Yapılan incelemeler sonucunda her banyo bileşeninin morfoloji, sertlik ve korozyon dayanımı gibi özellikleri ciddi miktarda etkilediği görülmektedir. Genel olarak yüzey morfolojiler pürüzsüz olmakla birlikte, nanokompozit kaplamanın yüzeyinin daha kaba olduğu optik resimlerden anlaşılmaktadır. Ana yapıya bor elementi ilavesi mikro sertliği yaklaşık %38 oranında artırırken, TiB2 takviyesiyle birlikte saf nikele göre %140, Ni-B alaşımına göre %75 oranında iyileşme olmasına sebep olmuştur. Bor takviyesi korozyon dayanımını azaltırken, TiB2 takviyesi korozyon dayanımında artışa neden olmuştur.

Anahtar Kelimeler

• Elektrodepolama
• Nanokompozit kaplamalar
• Ni-B alaşım
• Elektrokimyasal kaplama

Effect of Electrolyte Components on Electrodeposited Nanocomposite Coatings

Öz

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.

Anahtar Kelimeler

• Electrodeposition
• Nanocomposite coatings
• Ni-B alloys
• Electrochemical coatings

Kaynakça

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