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

Year 2019, Volume: 7 Issue: 3, 654 - 662, 01.09.2019

Şennur Candan , Serdar Çim , Seren Emir Ercan Candan

https://doi.org/10.36306/konjes.613896

Cited By: 1

Abstract

Bu çalışmada, aynı şartlarda üretilmiş (benzer katılaşma hızı ve benzer
kimyasal bileşimde) farklı Fe içeriğine (% ağ. 0.025, 0.05, 0.1) sahip AZ91 Mg alaşımlarının
korozyon davranışları-Fe tolerans limit değeri arasındaki ilişki
değerlendirilmiştir. Numunelerin mikro yapı analizleri
Taramalı Elektron Mikroskobu (SEM) ve X Işını Difraktometre (XRD) kullanılarak
yapılmıştır. Korozyon davranışları %3,5 NaCl çözeltisinde, ağırlık kaybı
ve potansiyodinamik polarizasyon test yöntemleri kullanılarak araştırılmıştır. 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 kaybının eksponansiyel olarak
arttığını göstermiştir.

Keywords

AZ91 Mg alaşımı, Mikro yapı, Korozyon

Supporting Institution

Bilecik Şeyh Edebali Üniversitesi BAP

Project Number

2017-01.BSEU.03-02

Thanks

Bu çalışma Bilecik Şeyh Edebali Üniversitesi, 2017-01.BSEU.03-02 nolu BAP projesinden desteklenmiştir.

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

Abstract

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.

Keywords

AZ91 Mg alloys, Microstructure, Corrosion

Project Number

2017-01.BSEU.03-02

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