目的 改善FeCrAl涂层表面组织，提高其耐高温盐溶液腐蚀性能。方法 用电弧喷涂方法在45碳钢表面制备FeCrAl（Cr 25.5%，Al 5.5%，Fe余量）涂层。用强流脉冲电子束（HCPEB）对FeCrAl涂层进行表面改性处理，工作参数为：脉冲宽度200 μs，能量密度分别为20、25、30、40 J/cm2。处理脉冲次数均为1次。通过金相显微镜和扫描电子显微镜对改性层形貌进行分析，通过电子探针方法测量改性前后涂层中Fe、Cr、Al和O元素的分布变化，利用X射线衍射分析对比改性层的相成分组成。在温度650 ℃下，以Na2SO4+K2SO4饱和盐溶液为腐蚀介质，测试FeCrAl涂层的高温腐蚀性能，并对腐蚀表面形貌进行分析。结果 HCPEB处理FeCrAl涂层发生表层重熔，原始粗糙疏松的涂层组织变得光滑致密，表面出现分离的球冠状凸起，凸起内部由排列紧密的Fe-Cr柱状晶组成，Al元素向凸起结构的表面和周围凹陷处聚集。随HCPEB处理能量密度增大，凸起结构尺寸增加，涂层表面的Fe2O3相消失，α-Al2O3相含量增多。经120 h高温腐蚀后，原始涂层腐蚀增重63.8 mg/cm2，HCPEB能量密度20 J/cm2处理的样品腐蚀增重51 mg/cm2。结论 使用HCPEB在脉冲宽度200 ms和能量密度20 J/cm2下处理FeCrAl涂层后，其高温腐蚀增重较原始涂层减少20%，而使用过高的HCPEB能量密度处理会导致FeCrAl涂层表面结构和耐高温腐蚀性能变差。

The work aims to increase the high-temperature resistance of FeCrAl coating against salt solution erosion by improving its surface microstructure. The FeCrAl coating with 25.5% Cr, 5.5% Al and rest Fe was prepared on 45 carbon steel by arc spraying method, and then treated once by HCPEB with the pulse width of 200 μs and energy density of 20, 25, 30 and 40 J/cm2 respectively. The morphology of FeCrAl coating before and after HCPEB treatment was studied by optical microscopy (OM) and scanning electron microscopy (SEM). The distribution of alloying elements as Fe, Cr, Al and O in the modified surface layer was measured with electron probe micro-analyzer (EPMA). The phase composition was analyzed by X-ray diffractometry (XRD). The high-temperature erosion resistance of FeCrAl coating was tested in saturated solution of Na2SO4 and K2SO4 as the erosion medium at 650 ℃ and the erosion morphology was analyzed. After HCPEB treatment, the surface layer of FeCrAl coating was remelted and the rough and loose surface became smooth and dense. Many bulged nodules composed of Fe-Cr column grains were formed on the modified surface. The agglomeration of Al element was observed at the surface of bulged nodules and the concave parts around. With the increasing energy density of HCPEB treatment, the size of nodules became larger. Moreover, the content of Fe2O3 phase decreased in the surface layer of FeCrAl coating with the more α-Al2O3 phase formed contrarily. After the 120 hours high temperature erosion tests, the weight gain of as-sprayed FeCrAl coating was 63.8 mg/cm2 and that of HCPEB treated sample with 20 J/cm2 was 51 mg/cm2. The high temperature erosion weight gain of FeCrAl coating treated by HCPEB with pulse width of 200 ms and energy density of 20 J/cm2 is reduced by 20% compared with the original coating, while the application of HCPEB treatment with excessive high energy density deteriorates the surface microstructure and high temperature erosion resistance of FeCrAl coating.