Diffusion Study of Al-8%Si Alloy Double-Coating on Steel

Abstract:

Al-8%Si alloy double-coating on Q235 steel were produced, Then the samples were executed diffusion at high temperatures protecting with flowing argon gas. Scanning electron microscope (SEM), optical microscope (OM), and energy dispersive X-ray spectroscope (EDS) were employed for microstructure observation of cross-sectional, surface and compositional analysis of coating. The diffusion mathematical model was established with the finite element method. The results show that good quality Al-8%Si coating is made; after heat-diffusion treatment, the new phases FeAl and Fe3Al presents; Silicon atoms in Al-8%Si alloy can hinder the diffusion of aluminum atoms into steel substrate at high temperature; Al-8%Si alloy double-coating sample’s high-temperature oxidation resistance is higher than Q235 steel. This material is hopefully used in the engine exhaust manifold.

• Periodical: Advanced Materials Research (Volumes 189-193)
• Pages: 1080-1084
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.189-193.1080
• Online since: February 2011
• Authors: Yu Heng Lu, Cai Min Huang, Jian Min Zeng
• Keywords: Al-8%Si Double-Coating, Diffusion, High Temperature Oxidation Resistance, Hot-Dip

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