中文摘要：

用热浸镀铝+高温热扩散工艺在316L不锈钢表面制备了铁铝梯度涂层,再用工业纯氮气中残留的氧气对其进行氧化处理制备了氧化铝梯度涂层;用OM、SEM、EDS、XRD、XPS和显微硬度仪等方法对涂层进行了分析。结果表明:750℃浸镀10 min的热浸镀铝涂层经950℃×4 h热扩散后,涂层表面质量较好,平均厚度120μm,与基体结合紧密;铝、铁呈良好梯度分布,表面最高硬度为800~850 HV;经900℃×4 h氧化处理后,氧与铝涂层进行了择优氧化,在距表面100nm以内原位反应生成了氧化铝,且除涂层表面是一层致密的氧化铝膜外,在膜以内氧化铝含量呈梯度分布。

英文摘要：

Fe-Al gradient coating was prepared on 316L stainless steel surface by hot-dip aluminizing and high-temperature thermal diffusion.Then the as-prepared aluminized coating was oxygenated by the residual O2 in 98.5%N2.The coating was analyzed by OM,SEM,EDS,XRD,XPS and microhardness.The results show that the average thickness of the coating is 120 μm with good surface after hot dipping at 750 ℃ for 10 min and diffusion at 950 ℃ for 4 h.The coating also had good adherence with the substrate.The surface hardness ...