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在实验室条件下模拟了烘烤硬化钢450℃下热镀锌镀层的合金化退火过程,研究镀层锌铁合金相的形成和转变过程、镀层相结构和镀层的抗粉化性能,并给出了所用的研究方法和主要研究结果。研究表明:镀层在450℃合金化退火,当保温时间延长到60～120s时,镀层内的δ相将会分为δ1k相和δ1p相两层,而且随时间延长,δ1k相增厚、δ1p相减薄,同时镀层表面柱状ζ相也有所减少,镀层抗粉化性能相应变差。
Under laboratory conditions, the alloying annealing process of hot-dip galvanized coating at 450 ℃ in bake hardened steel was simulated to study the formation and transformation process of galvanized iron-zinc alloy coating, the phase structure of the coating and the powdering resistance of the coating. The research methods used and the main findings. The results show that the coating is annealed at 450 ℃. When the holding time is extended to 60-120s, the δ phase in the coating will be divided into two layers of δ1k phase and δ1p phase. With the extension of time, the δ1k phase becomes thicker and the δ1p phase Thinning, while the coating surface columnar ζ phase has also been reduced, coating anti-chalking performance correspondingly worse.