TOZ METALURJİSİ İLE ELDE EDİLEN DÜŞÜK KARBON ÇELİĞİNİN %3.5 NaCl ORTAMINDAKİ KOROZYONUNA NİYOBYUM VE VANADYUMUN ETKİSİ

Year 2017, Volume: 12 Issue: 3, 73 - 86, 06.07.2017

İlyas Uygur , Hüsnü Gerengi , Mehmet Akif Erden , Mesut Yıldız

Abstract

Bu çalışmada referans
numunenin kimyasal kompozisyonuna sırasıyla ağırlıkça %0.05 ve %0.075 oranında
niyobyum ve vanadyum ilave edilmesiyle üretilen yeni alaşımların korozyon
mekanizması %3.5 NaCl ortamında araştırılmıştır. Korozyon mekanizmasının anlık
belirlenmesine olanak sağlayan Dinamik Elektrokimyasal Empedans Spektroskopisi (DEIS)
yöntemi ilk defa bu çalışmayla mikroalaşım elementlerinin korozyona etkisinin
belirlenmesinde kullanılmıştır. Hazırlanan numunelerin yüzey morfolojisi 15
saat süren DEIS deneyleri sonunda optik mikroskopla incelenerek elektrokimyasal
verilerle kıyaslanmıştır. Deney sonuçlarına göre niyobyum ve vanadyum miktarındaki
artışın imal edilen yeni alaşımların %3.5 NaCl ortamında oluşan korozyon
hızını azalttığını göstermektedir. Deney sonunda elde
edilen R_ct değeri, alaşım
elementlerinin ilavesiyle ortalama %44 ila %57 oranında artış göstermektedir.
DEIS verileri ile optik resimler birbirini destekler niteliktedir. Alaşım elementleri
ilave edilmeyen numunenin yüzeyinde daha çok korozyon ve buna bağlı olarak
deformasyon olduğu görülmüştür. 

Keywords

Korozyon, Niyobyum, Vanadyum, Mikroalaşımlı Çelikler, DEIS

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