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通过模拟合金化镀锌试验,研究了IF钢合金化镀层结构随着合金化时间的演变规律。结果表明:在520℃合金化时,随着合金化时间的延长,镀层中铁含量快速增加,而当铁含量超过12%时,增长缓慢。合金化7 s时,镀层从表面到基板依次是纯锌η相、柱状ζ相(Fe Zn13)以及栅状δ1P相;随着时间增加,基体Fe继续向镀层扩散,纯锌η相、柱状ζ相消失,栅状δ1P相逐渐转变为致密的δ1k相,同时在基板处生产了齿状的Γ相,在合金化17 s后,镀层相结构最终稳定为δ1k相和基板处少量的Γ相。
By simulating alloying galvanizing test, the evolution of the structure of IF steel alloy plating with alloying time was studied. The results show that the content of iron in the coating rapidly increases with the alloying time at 520 ℃ and slowly increases when the iron content exceeds 12%. After 7 s of alloying, the surface of the coating from the surface to the substrate were pure zinc η phase, columnar ζ phase (Fe Zn13), and grid-like δ1P phase. With the increase of time, the matrix Fe continued to diffuse to the coating, pure zinc η phase, columnar ζ The phase of the grid-like δ1P gradually transforms into the dense δ1k phase, while the dentate Γ phase is produced at the substrate. After 17s of alloying, the phase structure of the coating finally becomes δ1k phase with a small amount of Γ phase at the substrate.