Influence of Si content on interface reaction of iron-based hot-dip aluminizing on Fe sheet

Abstract

Based on the diffusion channel, the influence of Si content on the microstructure evolution of iron-based hot-dip Al-χSi coating was analyzed (χ=0, 1.5 wt%, 3.0 wt% and 7.0 wt%). The results show that the introduction of Si makes the reaction interface change from the lingual-tooth interface of hot-dip Al to the flat interface of hot-dip Al-Si. It also reduces the thickness of the alloy layer in the coating, especially the Fe₂Al₅ layer. When the Si content is 1.5 wt% or 3.0 wt%, the diffusion channel crosses the conjugate line of the two-phase region (FeAl₃+liquid phase) into the FeAl₃ single-phase region, and then moves to the region with higher Si content. Next, the diffusion channel cuts off the conjugate line of FeAl₃ phase, τ₁/τ₉ phase, and Fe₂Al₅ phase, which promotes the form of τ₁/τ₉ phase. The formed τ₁/τ₉ phase inhibits the diffusion between Fe and Al atoms. When the Si content is 7.0 wt%, the diffusion channel passes through the two-phase region (liquid phase+τ₅) and enters the τ₅ single-phase region. The form of τ₅ single-phase region has a strong inhibitory effect on the interatomic diffusion of Fe and Al, thereby reducing the thickness of the coating, especially the Fe₂Al₅ layer.

Keywords

hot-dip Al-Si / diffusion channel / interface reaction / microstructure evolution / coating

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