Iron aluminides are intermetallic Fe–Al alloys known for their high temperature corrosion and oxidation resistance, which makes them candidate materials for high temperature applications. In the present work, the formation of an iron aluminide layer on a mild steel substrate by friction stir surfacing of aluminium alloy AA6351 followed by isothermal heat treatment is reported. After Al-alloy deposition, the samples were subjected to annealing at temperature of 500, 550, 600 and 650 °C for various times up to 120 h. Microstructure analyses conducted by XRD and SEM/EDS indicated the formation of a homogenous layer of Fe₂Al₅ with average hardness value of 1070 HV for a 72-h treatment at 650 °C. The electrochemical corrosion behaviour of the developed coatings was analysed, and it was possible to show that friction stir surfacing followed by heat treatment constitutes an effective processing route for obtaining iron aluminide coatings on conventional steel substrates.

铝化铁是金属间铁-铝合金，以其耐高温腐蚀和抗氧化作用而闻名，这使其成为高温应用的候选材料。在目前的工作中，报道了通过铝合金AA6351的摩擦搅拌堆焊，然后进行等温热处理，在低碳钢基材上形成铝化铁层。铝合金沉积后，将样品在500、550、600和650°C的温度下退火120个小时。XRD和SEM / EDS进行的微结构分析表明，形成了均匀的Fe ₂ Al ₅层在650°C下进行72小时处理时，平均硬度值为1070 HV。分析了显影涂层的电化学腐蚀行为，并且可能表明摩擦搅拌堆焊和热处理构成了在常规钢基材上获得铝化铁涂层的有效工艺路线。