Hot corrosion behavior of CoCrFeNiAl HEA produced by powder metallurgy in NaCl molten salt

Abstract

The present work reports the hot corrosion behavior of equimolar CoCrFeNiAl high entropy alloy (HEA) produced by powder metallurgy. The hot corrosion behavior of the HEA was characterized in severe conditions involving NaCl molten salt environment and cyclic mode. The mass gain of CoCrFeNiAl HEA after being hot corroded at 850°C for 120 h was about 2.2 mg/cm2. After 120 h of hot corrosion at 850°C, XRD analysis result revealed that the constituent phases of the scale formed on CoCrFeNiAl HEA were Al2O3, Fe2O3, Cr2O3, NiO and NiCr2O4. The corrosion scale mainly consisted of Cr2O3, and underneath this layer was dominated by a discontinuous thin layer of Al2O3. The role of NaCl on the hot corrosion mechanism was also discussed.

Keywords

• Powder metallurgy
• high entropy alloys
• CoCrFeNiAl
• hot corrosion

Toz metalurjisi ile üretilen CoCrFeNiAl YEA'nın NaCl erimiş tuz içindeki sıcak korozyon davranışı

Abstract

Mevcut çalışma, toz metalurjisi ile üretilen eşmolar CoCrFeNiAl yüksek entropili alaşımının (YEA) sıcak korozyon davranışını ele almaktadır. YEA’nın sıcak korozyon davranışı, NaCl erimiş tuz ortamı ve döngüsel modu içeren zorlu koşullarda karakterize edilmiştir. CoCrFeNiAl YEA’nın 850°C’de 120 saat sıcak korozyona maruz kalmasının ardından kütle kazancı yaklaşık 2.2 mg/cm2 idi. 850°C’de 120 saat sıcak korozyon sonrasında, XRD analiz sonucu CoCrFeNiAl YEA üzerinde oluşan skalayı oluşturan fazların Al2O3, Fe2O3, Cr2O3, NiO ve NiCr2O4 olduğunu göstermiştir. Korozyon skalası esas olarak Cr2O3’ten oluşuyordu ve bu tabakanın altında, süreksiz ince bir Al2O3, tabakası baskındı. Ayrıca NaCl’nin sıcak korozyon mekanizması üzerindeki rolü de tartışılmıştır.

Keywords

• Toz metallurjisi
• yüksek entropili alaşımlar
• CoCrFeNiAl
• sıcak korozyon

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