İsmail Hakkı KARA, İsmail Hakkı KARA, Hayrettin AHLATCI, Yunus TÜREN

AZ31-1Ca Saç Alaşımların Korozyon Direncine Seryum ve İkizlenme Fraksiyonun Etkisi

Bu çalışmada, %0,2 ile %1 arasında Ce elementi AZ31-1Ca alaşımına ilave edilmiş ve alçak basınçlı kokil kalıba döküm yöntemiyle alaşımlar üretilmiştir. Üretilen alaşımlara 400 °C’de ve 1,5 m/min hadde hızında %15 olacak şekilde paso başına kesit daralması yapılarak sıcak haddeleme uygulanmıştır. ASTM G31 standardına göre saç malzemelerden çıkartılan malzemeler üzerinde 72 saat boyunca daldırma korozyon testi yapılmıştır. Ce ilaveli alaşımların korozyon direncine ikincil fazların, ortalama tane boyutunun ve ikizlenme fraksiyonun etkisi mikroyapısal karakterizasyon bulgularıyla desteklenerek incelenmiştir.

Anahtar Kelimeler:

AZ31, Ca, Ce, Sıcak Hadde, Daldırma Korozyon

The Effect of Cerium and Twins Fraction on Corrosion Resistance of AZ31-1Ca Sheet Alloys

In this study, in the range of 0.2% to 1.0% Ce elements were added to AZ31-1Ca alloys produced by low pressure die casting method. Hot rolling process was applied to these produced alloys at 400 °C with 1,5 m/min rolling speed at 15% deformation rate per pass. The corrosion resistance of samples extracted from sheets that have included different twins fraction after various Ce adding were investigated at 3.5% NaCl solution for 72 hours according to ASTM G31 of Standard Practice for Laboratory Immersion Corrosion Testing of Metals. The effect of secondary phases, grain size and twins on immersion corrosion resistance of investigated alloys was studied systemically on the base of microstructure analysis.

Keywords:

AZ31, Ca, Ce, Hot Rolling, Immersion corrosion,

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Referans1 L. Meng, P. Yang, Q. Xie ve W. Mao, “Analyses on Compression Twins in Magnesium,” Materials Transactions, 49, 710-714, 2008.
Referans2 A. Styczynski, C. Hartig, J. Bohlen ve D. Letzig, “Cold rolling textures in AZ31 wrought magnesium alloy,” Scripta Materialia, 50, 7, 943-947.
Referans3 F. Cao, G. Song ve A. Atrens, “Corrosion and passivation of magnesium alloys,” Corrosion Science, 111, 835-845, 2016.
Referans4 L. Wang, B. Ping Zhang ve T. Shinohara, “Corrosion behavior of AZ91 magnesium alloy in dilute NaCl solutions,” Materials and Design, 31, 857-863, 2010.
Referans5 Zhang, L. Tong, Z. Jiang, L. Cheng, S. Kamado ve H. Zhang, “Influence of Ca-Ce/La synergistic alloying on the microstructure and mechanical properties of extruded Mg–Zn alloy,” 708, 11-20, 2017.
Referans6 G. Fei, Z. Dingfei, Y. Xusheng, J. Luyao, C. Sensen ve P. Fusheng, “Influence of rolling speed on microstructure and mechanical properties of AZ31 Mg alloy rolled by large strain hot rolling,” Materials Science and Engineering: A, 607, 383-389, 2014.
Referans7 M. Sanjari, High strain rate deformation of Magnesium alloys, Montreal: McGill University, 2013.
Referans8 Kara, I. H., Yousef, T. A. I., Ahlatci, H., & Turen, Y., “Ca and Ce Effect on the Corrosion Resistance of Hot-Rolled AZ31 Mg Alloys”. Engineering, Technology & Applied Science Research, 10(1), 5113-5116,2020.
Referans9 S. Li, W. Zheng, B. Tang, D. Zeng ve X. Guo, “Grain Coarsening Behavior of Mg-Al Alloys with Mischmetal Addition,” Journal of rare earths, 25, 2, 227-232, 2007.
Referans10 H. Feng, S. Liu, Y. Du, T. Lei, R. Zeng ve T. Yuan, “Effect of the second phases on corrosion behavior of the Mg-Al-Zn alloys,” Journal of Alloys and Compounds, 695, 2330-2338, 2017.