通过热浸镀铝/微弧氧化复合工艺对H13模具钢进行表面改性以提高模具表面质量。在热浸镀铝过程中,将H13钢基体浸入710℃纯铝液6 min,得到了以Fe2Al5为主中间合金层,使得镀层与基体紧密结合。经过微弧氧化处理后,镀铝试样表面铝层转化为氧化铝陶瓷,主要由α-Al2O3和γ-Al2O3相组成。用带有能谱分析装置（EDX）的扫描电镜（SEM）、X射线衍射（XRD）分析了膜层的形貌、成分和相组成。微弧氧化陶瓷层主要由Al、O、Si元素组成,其中O、Si主要来源于硅酸盐电解液。
Hot dipping pure aluminum on a H13 steel followed by plasma electrolytic oxidation（PEO） was performed to prepare composite ceramic coating on the H13 steel surface.H13 steel bars were first dipped in pure aluminum melts（710 ℃） for 6 min,and a Fe2Al5 intermetallic layer was obtained at the interface between the melt and the steel substrate.The intermetallic layer significantly improved the adhesion strength between Al layer and substrate.After PEO processing,uniform Al2O3 ceramic coatings were deposited on the surface of aluminized steel.The composition,phases and morphology of the aluminized layer and the ceramic coatings were characterized by SEM/EDX and XRD.The PEO layers mainly consist of α-Al2O3 and γ-Al2O3.The element O and Si in the ceramic layers came from the alkaline electrolytle.
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