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Ahmad Farooq,张林,郑军,Sidra Iram,张世宏.等离子渗镀CrON复合涂层结构与抗铝液熔蚀性能[J].稀有金属材料与工程(英文),2021,50(5):1523~1530.[Ahmad Farooq,Zhang Lin,Zheng Jun,Sidra Iram and Zhang Shihong.Microstructure and Corrosion Behavior of Duplex CrON Coatings in Molten Aluminum[J].Rare Metal Materials and Engineering,2021,50(5):1523~1530.]
Microstructure and Corrosion Behavior of Duplex CrON Coatings in Molten Aluminum
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Received:May 09, 2020  
DOI:
Key words: CrON  duplex coating  microstructure  immersion corrosion  molten aluminum
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Ahmad Farooq,Zhang Lin,Zheng Jun,Sidra Iram and Zhang Shihong  
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Abstract:
      The duplex CrON coatings were prepared on H13 tool steels by combination of plasma nitriding and arc ion plating. The effects of oxygen flow rate on microstructure and corrosion behavior of duplex CrON coating in the molten aluminum were investigated. Results show that the as-deposited coatings with oxygen flow rate of 0, 50, and 100 mL/min, namely CrON-0, CrON-50, and CrON-100 coatings, mainly consist of B1-CrN phase. The major components of CrON coating change from nitride into oxide phase with increasing the oxygen flow rate, and the Cr2O3 crystalline phase is obviously observed in the as-deposited coatings with oxygen flow rate of 200 mL/min, namely CrON-200 coating. Oxygen addition in nitride restrains the columnar growth of grains resulting in the dense microstructure. The surface defects and roughness increase with the increase of oxygen content. The failure behavior of duplex CrON coatings is mainly corrosion pitting in molten aluminium. The CrON-50 coating reveals the best corrosion resistance due to the dense columnar microstructure and high thermal stability. The dense Cr2O3 layer in CrON-200 coating is also favourable for corrosion protection against the molten aluminum.