Role of β phase on Corrosion Beheviour of AZ Series Mg Alloys

Yıl 2018, Cilt: 6 Sayı: 4, 1139 - 1162, 01.08.2018

Şennur Candan Serdar Çim Seren Emir Ercan Candan

https://doi.org/10.29130/dubited.416767

Cited By: 4

Öz

Although there are numerous studies to understand the corrosion mechanisms of AZ series Mg alloys, the views on the role of β-phase in the corrosion of these alloys are contradictory. This review focuces on the influence of micro alloying elements and the solidification rate on the β phase structure, affecting the corrosion of AZ series Mg alloys. Additionally, the oxide film-β phase relationship on the surface of the alloys also are evaluated on their corrosion properties. The results showed that the β phase in AZ series Mg alloys play two-side role; enhancing or inhibiting the corrosion depending on the size and amount of β phase. In the literature, the β phase inhibits the corrosion by barier effect or vice versa promotes corrosion by microgalvaning coupling, which are attributed to the differences in production methods and consequent β phase structure which is why some researchers have come to the contradictorily conclusions.

Anahtar Kelimeler

AZ Series Mg Alloys, Intermetallic, Corrosion

AZ Serisi Mg Alaşımlarının Korozyon Davranışlarında β-Fazının Rolü

Öz

AZ serisi Mg alaşımlarının korozyon mekanizmalarını anlamaya yönelik literatürde birçok çalışma bulunmasına
rağmen, bu alaşımların korozyonunda β fazının rolü üzerindeki görüşler çelişkilidir. Dolaysıyla bu derleme
çalışmasında, AZ serisi Mg alaşımlarının korozyonu üzerine mikro alaşımlama elementlerinin ve katılaşma
hızının β fazı yapısına olan etkileri irdelenmiştir. Ayrıca, alaşımların korozyon özelliklerinde yüzeyde oluşan
oksit filmi-β fazı ilişkisi de değerlendirilmiştir.
Sonuçlar, AZ serisi Mg alaşımlarındaki β fazının boyutuna ve miktarına bağlı olarak hem korozyonu arttırıcı
hem de engelleyici rol oynadığını göstermiştir. Literatürde, bazı araştırmacıların neden β fazının bariyer etkisi ile
korozyonu engellediğini veya bazılarının tam tersi neden β fazının mikrogalvanik çift oluşturarak galvanik
korozyonu arttırdığı konusundaki çelişkili değerlendirmelerin üretim yöntemlerinden ve buna bağlı β fazı
yapısındaki farklılıklardan kaynaklandığı sonucuna varılmıştır.

Anahtar Kelimeler

AZ Serisi Mg Alaşımları, İntermetalik, Korozyon

Kaynakça

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