Sert krom kaplama parametrelerinin ferritik paslanmaz çeliğin yapısal, mekaniksel ve aşınma özelliklerine etkisi
Küçük Resim Yok
Tarih
2025
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Bursa Teknik Üniversitesi
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
Bir yüzeyin çevresel etkilerden korunabilmesi, sadece yüzey ile kalmayıp tüm bileşenin kullanım ömrünün uzatılabilmesi en önemli teknolojik ilerlemelerdendir. Elektrolitik sert krom kaplama, elektrik akımı ile çözünmüş metal katyonlarının bir elektrot üzerinde metal kaplama oluşturulması ile meydana gelmektedir. Sert krom kaplama yöntemi sergilemiş olduğu yüksek aşınma direnci, yüksek sertlik, düşük sürtünme katsayısı ile sanayide, özellikle otomotiv endüstrisinde, geniş bir kullanım alanına sahiptir. Bu çalışmada, farklı sert krom kaplama parametrelerinin (süre, akım) ferritik paslanmaz çelik (X2CrS13) üzerine biriktirilmesi ve bu parametrelerin yapısal, mekaniksel ve aşınma üzerindeki etkilerinin araştırılması amaçlanmıştır. Çalışma kapsamında dört farklı akım (1, 1,5, 2 ve 2,5 Amper) ve üç farklı süre (200, 250 saniye ve 300 saniye) seçilmiştir. SEM-EDS analizlerinde, tüm kaplama parametrelerinde sert krom kaplamanın başarıyla altlık malzemeye biriktirildiği gözlemlenmiştir. En yüksek kaplama kalınlığı, ~19,3 ?m, akım ve zaman parametrelerinin en yüksek olduğu (2,5 Amper ve 300 saniye) L kodlu numunede elde edilmiştir. Sert krom kaplamada gözlemlenen mikro çatlakların kaplamanın en dış yüzeyinden itibaren başladığı ve altlık malzemeye kadar uzandığı görülmüştür. Kaplamadan altlık malzemeye kadar uzanan mikrosertlik sonuçlarında en yüksek kaplama kalınlığına sahip numune (L kodlu) için kaplamanın en dış yüzeyinin altlık malzemeden 9 kat civarı yüksek mikrosertliğe sahip olduğu görülmüş ve bu durum aynı zamanda aşınma direnci üzerinde de olumlu etki yapmıştır. Kademeli çizik testlerinde uygulanan yükün artması ile birlikte numune yüzeyindeki deformasyonların genişlediği gözlemlenmiştir. Sert krom kaplamayla birlikte aşınma direncinde yaklaşık 3 kata kadar bir artış elde edilmiştir.
The capability to protect a surface from environmental effects, and to extend the life of not only the surface but also the entire component is one of the most important technological advances. Electrolytic hard chrome plating is obtained by creating a metal plating on an electrode with dissolved metal cations with electric current. The hard chrome plating has a wide range of uses in industry, especially in the automotive industry, due to its high wear resistance, high hardness and low friction coefficient. This study aimed to deposit different hard chrome plating parameters (time, current) on ferritic stainless steel (X2CrS13) and to investigate the effects of these parameters on structural, mechanical and wear. Four different currents (1, 1.5, 2 and 2.5 Ampere) and three different times (200, 250 seconds and 300 seconds) were decided on within the scope of the study. At SEM-EDS analyses, it was observed that the hard chrome plating was successfully deposited on the substrate material in all plating parameters. The highest plating thickness, ~19.3 ?m, was obtained in the L-coded sample, which had the highest current and time parameters (2.5 Ampere and 300 seconds). It was observed that the microcracks in the hard chrome plating started from the outermost surface of the plating and extended to the substrate material. In the microhardness results extending from the plating to the substrate material, it was seen that the outermost surface of the plating for the sample with the highest plating thickness (L-coded) had a microhardness approximately 9 times higher than the substrate material, and this also had a positive effect on the wear resistance. In the progressive scratch tests, it was observed that the deformations on the sample surface widened with the increase in the applied load. With the hard chrome plating, the wear resistance has been improved by up to a factor of 3.
The capability to protect a surface from environmental effects, and to extend the life of not only the surface but also the entire component is one of the most important technological advances. Electrolytic hard chrome plating is obtained by creating a metal plating on an electrode with dissolved metal cations with electric current. The hard chrome plating has a wide range of uses in industry, especially in the automotive industry, due to its high wear resistance, high hardness and low friction coefficient. This study aimed to deposit different hard chrome plating parameters (time, current) on ferritic stainless steel (X2CrS13) and to investigate the effects of these parameters on structural, mechanical and wear. Four different currents (1, 1.5, 2 and 2.5 Ampere) and three different times (200, 250 seconds and 300 seconds) were decided on within the scope of the study. At SEM-EDS analyses, it was observed that the hard chrome plating was successfully deposited on the substrate material in all plating parameters. The highest plating thickness, ~19.3 ?m, was obtained in the L-coded sample, which had the highest current and time parameters (2.5 Ampere and 300 seconds). It was observed that the microcracks in the hard chrome plating started from the outermost surface of the plating and extended to the substrate material. In the microhardness results extending from the plating to the substrate material, it was seen that the outermost surface of the plating for the sample with the highest plating thickness (L-coded) had a microhardness approximately 9 times higher than the substrate material, and this also had a positive effect on the wear resistance. In the progressive scratch tests, it was observed that the deformations on the sample surface widened with the increase in the applied load. With the hard chrome plating, the wear resistance has been improved by up to a factor of 3.
Açıklama
Anahtar Kelimeler
Metalurji Mühendisliği, Metallurgical Engineering
