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

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

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 Rct 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.

Anahtar Kelimeler:

Korozyon, Niyobyum, Vanadyum, Mikroalaşımlı Çelikler, DEIS

PDF

___

1. Korczynsky, M., (1988). Microalloying and Thermo-Mechanical Treatment. Proceedings of International Symposium Processing. Pittsburgh, pp: 169-201.
2. Sage, A.M., (1992). An Overview of The Use of Mikroalloys in HSLA Steels with Particular Reference to Vanadyum and Titanium, Processing, Properties and Applications. Proceedings of the Second International Conference on HSLA Steels. Beijing, pp:51-60.
3. Erden, M.A., Gündüz, S., Karabulut, H., and Türkmen, M., (2016). The Effect of V Addition on the Microstructure and Mechanical Properties of Low Carbon Microalloyed Powder Metallurgy Steels. Meterials Testing, Volume:58, pp:433-437.
4. Karabulut, H., (2004). Mikroalaşımlı Çeliklerde Yaşlanma Sertleştirmesinin Mekanik Özelliklere Etkisi. Yüksek Lisans Tezi. Zonguldak: Zonguldak Karaelmas Üniversitesi Fen Bilimleri Enstitüsü.
5. Erden, M.A., (2015). Toz Metalürjisi İle Üretilen Mikroalaşımlı Çeliklerin Mikroyapı Mekanik Özellik İlişkisinin Araştırılması. Doktora Tezi. Karabük: Karabük Üniversitesi Fen Bilimleri Enstitüsü.
6. Koltuk, F., (1996). Mikroalaşımlı Çeliklerin İkincil Sıcak Şekillendirilmesinde Özelliklerin Optimizasyonunun İncelenmesi. Doktora Tezi. İstanbul: Yıldız Teknik Üniversitesi Fen Bilimleri Enstitüsü.
7. Morrison, W.B., (2000). Overview of Microalloying in Steel. The Proceedings of the Vanitec Symposium. Guilin, pp:25-35.
8. Lindsley, B., Schade, C. and Murphy, T., (2012). Vanadium and Silicon Alloyed PM Steels. Hoeganaes Corporation. NJ 08077 USA, pp:1-6.
9. Erden, M.A., Gündüz, S., Karabulut, H., and Türkmen, M., (2014). Microstructural Characterization and Mechanical Properties of Microalloyed Powder Metallurgy Steels. Materials Science and Engineering, Volume:616, pp:201-206.
10. British Standarts Institution, (1990). Standard Test Method for Particle-size Analysis. BSI, London.
11. Gladman, T. and Woodhead, J.H., (1960). The Accuracy of Point Counting in Metallographic Investigations. Journal of Iron and Steel Research, Volume:194, pp:184‐193.
12. Gerengi, H., Bereket, G., and Kurtay, M., (2016). A Morphological and Electrochemical Comparison of The Corrosion Process of Aluminum Alloys under Simulated Acid Rain Conditions. Journal of the Taiwan Institute of Chemical Engineers, Volume:58, pp:509-516.
13. Gerengi, H., Darowicki, K., Bereket, G., and Slepski, P., (2009). Evaluation of Corrosion Inhibition of Brass-118 in Artificial Seawater by Benzotriazole Using Dynamic EIS. Corrosion Science, Volume:51, pp:2573-2579.
14. Darowicki, K., Orlikowski, J., and Lentka, G., (2000). Instantaneous Impedance Spectra of A Non-stationary Model Electrical System. Journal of Electroanalytical Chemistry, Volume 486, pp:106-110.
15. Nagarajan, S., Karthega, M., and Rajendran, N., (2007). Pitting Corrosion Studies of Super Austenitic Stainless Steels in Natural Sea Water Using Dynamic Electrochemical Impedance Spectroscopy. Journal of Applied Electrochemistry, Volume:37, pp:195-201.
16. Darowicki, K., Slepski, P., and Szocinski, M., (2005). Application of The Dynamic EIS to İnvestigation of Transport Within Organic Coatings. Progress in Organic Coatings, Volume:52, pp:306-310.
17. Ryl, J., Darowicki, K., and Slepski, P., (2011). Evaluation of Cavitation Erosion–corrosion Degradation of Mild Steel by means of Dynamic Impedance Spectroscopy in Galvanostatic Mode. Corrosion Science, Volume:53, pp:1873-1879.
18. Gerengi, H., Darowicki, K., Slepski, P., Bereket, G., and Ryl, J., (2010). Investigation Effect of Benzotriazole on The Corrosion of Brass-MM55 Alloy in Artificial Seawater by Dynamic EIS. Journal of Solid State Electrochemistry, Volume:14, pp:897-902.
19. Gerengi, H., Slepski, P., and Bereket, G., (2013). Dynamic Electrochemical Impedance Spectroscopy and Polarization Studies to Evaluate The Inhibition Effect of Benzotriazole on Copper‐manganese‐aluminium Alloy in Artificial Seawater. Materials and Corrosion, Volume:64, pp:1024-1031.
20. Gerengi, H., Göksu, H., and Slepski, P., (2014). The Inhibition Effect of Mad Honey on Corrosion of 2007-type Aluminium Alloy in 3.5% NaCl Solution. Materials Research, Volume:17, pp:255-264.
21. Gerengi, H., Ugras, H.I., Solomon, M.M., Umoren, S.A., Kurtay, M., and Atar, N. (2016). Synergistic Corrosion Inhibition Effect of 1-ethyl-1-methylpyrrolidinium tetrafluoroborate and Iodide Ions for Low Carbon Steel in HCl Solution. Journal of Adhesion Science and Technology, Volume:30, pp:2383-2403.
22. Gerengi, H., Uygur, I., Solomon, M., Yildiz, M., and Goksu, H., (2016). Evaluation of The Inhibitive Effect of Diospyros kaki (Persimmon) Leaves Extract on St37 Steel Corrosion in Acid Medium. Sustainable Chemistry and Pharmacy, Volume:4, pp:57–66.
23. Gerengi, H., Jazdzewska, A., and Kurtay, M., (2015). A Comprehensive Evaluation of Mimosa Extract As A Corrosion Inhibitor on AA6060 Alloy in Acid Rain Solution: Part I. Electrochemical AC methods. Journal of Adhesion Science and Technology, Volume:29, pp:36–48.
24. Gerengi, H. and Kurtay, M., (2014). Dinamik Elektrokimyasal Empedans Spektroskopisi (DEIS). Düzce Üniversitesi Bilim ve Teknoloji Dergisi, Cilt:1, ss:71-78.
25. Sepulveda, R. and Arenas, F., (2001). TiC–VC–Co: A Study on Its Sintering and Microstructure. International Journal of Refractory Metals and Hard Metarials, Volume:19, pp:389-396.
26. Ollilainen, V., Kasprzak, W., and Hollapa, L., (2003). The Effect of Silicon, Vanadium and Nitrogen on The Microstructure and Hardness of Air Cooled Medium Carbon Low Alloy Steels. Journal of Metarials Processing Technology, Volume:134, pp:405-412.
27. Xiang-done, H., Xin-ping, M., and Sheng-xia, L., (2013). Effect of Annealing Temperature on Recrystallization Behavior of Cold Rolled Ti‐Microalloyed Steel. Journal of Iron and Steel Research, Volume:20, pp:105-110.
28. Gladman, T., (1997). The Physical Metallurgy of Microalloyed Steels. London: Institute of Materials.
29. Du, B., Zou, Z., Wang, X., and Li, Q., (2007). In Situ Synthesis of TiC–TiB2 Reinforced FeCrSiB Composite Coating By Laser Cladding. Surface Review and Letters, Volume:14, pp:315-319.
30. Najafi, H., Rassizadehghani, J., and Halvaaee, A., (2007). Mechanical Properties of As Cast Microalloyed Steels Containing V, Nb and Ti. Materials Science and Technology, Volume:23, pp:699–705.
31. Chokkalingam, B., Nazirudeen, S.S.M., and Ramakrishnan, S.S., (2011). Investigation Into The Mechanical Properties of Micro-Alloyed As-Cast Steel. Materials and Technology, Volume:45, pp:159–162.
32. Rivas, A.L., Michal, D.M., Burnett, M.E., Musolff, C.F., in: Van Tyne, C.J., Krauss, G and Matlock, D.K., (Eds.) (1998). Collection Papers 2nd Int. Symp., “Microalloyed bar and forging steels”, The Minerals, Metals & Materials Society, Golden, Colorado, U.S.A., pp:159-172.
33. Rivas, A.L., Vidal, E., Matlock, D.K., and Speer, J.G., (2008). Electrochemical Extraction of Microalloy Carbides in Nb-steel. Revista De Metalurgia, Volume:44, pp:447-456.