在17-4PH不锈钢上热浸镀铝,然后进行扩散退火处理.研究了热浸镀铝层的显微组织和显微硬度的变化,并考察了其高温耐氧化性能.结果表明:17-4PH不锈钢热浸镀铝后表面分为富铝层、合金层、基体层等3层,合金层主要相为Fe2Al5.经950℃.1 h的扩散处理后,富铝层全部转变为合金层,厚度约为100 μM,且分为内扩散层与外扩散层.内扩散层厚度约为40 μm,主要相为Fe3Al;外扩散层主要相为FeAl.合金层的显微硬度从表面到基体逐渐降低,表面显微硬度最高达到714 HV.17-4PH不锈钢经热浸镀铝后,其高温耐氧化性能显著提高.在1000℃,热浸镀铝件的高温耐氧化性能约是未镀铝件的7倍.在氧化过程中,表层致密的γ-Al2O3氧化膜和金属间化合物FeAl.Fe3Al起到高温耐氧化的作用.
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