Ni-B Alaşım Kaplamaların Kristal Yapı ve Sertlik Özelliklerine Akım Yoğunluğunun Etkisi

Year 2022, Volume: 37 Issue: 2, 439 - 448, 30.06.2022

Ersin Ünal Abdülkadir Yaşar İsmail Hakkı Karahan

https://doi.org/10.21605/cukurovaumfd.1146395

Abstract

Ni-B alaşım kaplamalar yüksek sertlik, yüksek aşınma direnci ve iyi korozyon direnci gibi üstün özellikleri sayesinde birçok endüstri dalında başarılı bir şekilde uygulanabilmektedir. Bu çalışmada, Ni-B alaşım kaplamalar geleneksel elektrokimyasal kaplama metoduyla paslanmaz çelik altlık üzerine farklı akım yoğunluğu değerlerinde depolanmıştır. Elektrokimyasal depolama işleminde Watts tipi geleneksel nikel banyosu kullanılmıştır. Nikel ana yapısına alaşım malzemesi olarak ilave edilen bor elementi kaynağı olması amacıyla elektrolite trimetilamin boran kompleksi (TMAB) ilave edilmiştir. Üretilen numunelerin kristal yapı, mikrosertlik ve morfoloji özellikleri incelenmiştir. Akım yoğunluğu azalması Ni-B kristal yapısının tane büyüklüğünde azalmaya neden olmuş ve yapının amorfa doğru kaymasına neden olmuştur. Ayrıca, akım yoğunluğu azalması neticesinde Ni-B kaplamanın mikrosertlik değerinde de artış olduğu tespit edilmiştir. Bunun yanında Ni-B alaşım kaplamaların farklı akım yoğunluğu değerlerinde depolanması neticesinde yüzey morfolojisinin de etkilendiği ve numunelerin farklı görünüme sahip olduğu anlaşılmıştır.

Keywords

Elektrodepolama, Akım yoğunluğu, Mikrosertlik, Kristal yapı, Ni-B alaşım kaplama

The Effect of Current Density on the Crystal Structure and Hardness Properties of Electrochemically Deposited Ni-B Alloy Coatings

Abstract

Ni-B alloy coatings can be successfully applied in many industries thanks to their superior properties such as high hardness, high wear resistance and good corrosion resistance. In this study, Ni-B alloy coatings were deposited on a stainless steel substrate at different current density values by conventional electrochemical coating method. A traditional Watts type nickel bath was used in the electrochemical deposition process. Trimethylamine borane complex (TMAB) was added to the electrolyte in order to be a source of boron element added to the nickel main structure as an alloying material. The crystal structure, microhardness and morphology properties of the produced samples were investigated. The decrease in current density caused a decrease in the grain size of the Ni-B crystal structure and caused the structure to shift towards amorphous. In addition, it was determined that the microhardness value of the Ni-B coating increased as a result of the decrease in current density. In addition, as a result of the Ni-B alloy coatings being deposited at different current density values, it was understood that the surface morphology was also affected and the samples had different appearances.

Keywords

Electrodeposition, Current density, Microhardness, Crystal structure, Ni-B alloy coating

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