Microstructure and high-temperature corrosion behaviors of aluminide coatings by low-temperature pack aluminizing process
Microstructure and high-temperature corrosion behaviors of aluminide coatings by low-temperature pack aluminizing process
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DOI：
10.1016/j.apsusc.2010.01.043
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发表时间：
2010-04
影响因子：
6.7
通讯作者：
Z. Zhan;Liu Zhong;Jianxiong Liu;Li Li-Li;Li Zeng;P. Liao
中科院分区：
文献类型：
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作者：
Z. Zhan;Liu Zhong;Jianxiong Liu;Li Li-Li;Li Zeng;P. Liao
采用表面细化和固体渗铝相结合的工艺，在600°C以下较低的温度和较短的处理时间下，在碳钢和Fe-5Cr-Mo合金表面获得了渗铝层。在传统的固体渗铝工艺中，由于机械振动引起的反复的钢球冲击，导致了基体表层的细化。分析了温度和处理时间对铝化物涂层形成的影响。采用SEM、AFM和XRD等分析手段对涂层的微观结构进行了研究。铝化物涂层为单层致密结构，晶粒细小，元素分布均匀。分别在600°C空气中200 h和10%SO2 +Ar混合气体中50 h进行高温氧化和硫化试验。质量增加和剥落表明铝化物涂层显着提高了高温抗氧化和抗硫化性能。
Aluminide coatings were produced on carbon steel and Fe–5Cr–Mo alloy at a relatively lower temperature below 600°C in shorter treatment time by a combination of surface refinement process and pack aluminizing process. Repetitive ball impact, generated by mechanical vibration, caused the top-layer refinement of substrates in a conventional pack aluminizing process. The effects of temperature and treatment time on the formation of aluminide coatings were analyzed. The microstructure of the coatings was investigated by SEM, AFM and XRD. The aluminide coatings were one-layer, compacted structure with ultrafine grains and uniform elemental distribution. High-temperature oxidation and sulphidation tests were carried out at 600°C in air for 200h and 10% SO2+Ar gas mixture atmosphere for 50h, respectively. The mass gains and spallation indicated that the aluminide coatings significantly improved the high-temperature oxidation and sulphidation resistance.