Formation and phase transformation of aluminide coating prepared by low-temperature aluminizing process
作者： Yanhui Sun , Jian Dong , Pengze Zhao , Bingsheng Dou
DOI: 10.1016/J.SURFCOAT.2017.10.025
关键词:
摘要: Abstract A low-temperature aluminizing process involving a surface slurry pre-coating and powder embedded process, with AlCl 3 as the chosen activator, was developed to avoid changes in mechanical properties of substrate at high temperatures. An electrolytic polishing using an acidic electroplating solution further adopted improve average roughness aluminide coating smoothing mechanism explained. Heat treatment promotes diffusion iron into aluminum substrate, phase structure changed simultaneously. After 30 h heat 700 °C, brittle phases Fe 2 Al 5 FeAl disappeared completely transformed no cracks were observed inside coating. Through above processes, dense ductile obtained thickness about 60 μm.
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