Şennur CANDAN, Seren EMİR, Serdar ÇİM, Ercan CANDAN

AZ91 Mg ALAŞIMLARINDA KOROZYON DAVRANIŞI-Fe TOLERANS SINIRI ARASINDAKİ İLİŞKİNİN ARAŞTIRILMASI

Bu çalışmada, aynı şartlarda üretilmiş (benzer katılaşma hızı ve benzer kimyasal bileşimde) farklıFe içeriğine (% ağ. 0.025, 0.05, 0.1) sahip AZ91 Mg alaşımlarının korozyon davranışları-Fe tolerans limitdeğeri arasındaki ilişki değerlendirilmiştir. Numunelerin mikro yapı analizleri Taramalı ElektronMikroskobu (SEM) ve X Işını Difraktometre (XRD) kullanılarak yapılmıştır. Korozyon davranışları%3,5 NaCl çözeltisinde, ağırlık kaybı ve potansiyodinamik polarizasyon test yöntemleri kullanılarakaraştırılmıştır. Mikroyapı analizlerinde, Fe içeriğinin artması ile yapıdaki “kısmen ayrışmış” veya“lameller ötektik” tipi β fazı morfolojilerinde artış eğiliminin daha fazla olduğu gözlenmiştir. Sonuçlar,AZ91 alaşımı Fe tolerans limit değerinin %0.05 olduğunu bu değerden sonra korozyon kaybınıneksponansiyel olarak arttığını göstermiştir.

An Investigation of Relationship Between Corrosion Behaviour- Fe Tolerance Limit in AZ91 Mg Alloys

In this study, relationship between Corrosion Behaviour-Tolerance Limit of Fe content (0.025, 0.05, 0.1 wt. %) in AZ91 Mg alloys, cast under similar chemical composition and cooling rate, were investigated. The microstructures of Mg alloys were analysed by Scanning Electron Microscopy (SEM) and X Ray Diffractometry (XRD). The corrosion behaviours were evaluated by immersion tests and electrochemical polarization measurements in 3.5 wt. % NaCl solution. Microstructure analysis revealed that the increase of Fe content increased the “partially divorced” or “lamella eutectic” type β phase morphologies in the microstructure. Results indicated that the limit content value of Fe in AZ91 alloys was 0.05 wt. % above which the corrosion loss had increased abruptly

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