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以1Cr17铁素体不锈钢为基体,在摩尔比2∶1的酸性AlCl3-EMIC(1-甲基-3-乙基咪唑氯化物)室温熔盐中电沉积均匀致密的铝镀层,然后分别在300℃、650℃6、70℃下进行不同时间的热处理,用刻划撕扯法判断镀层的结合力,用SEM、EDS及XRD对热处理后的试样界面进行微观分析。结果表明,试样经热处理后,结合力有了很大提高,镀层与基体之间发生互扩散形成合金层,合金层由含Cr的Fe2Al5、FeAl、Fe3Al等相组成,且随着温度提高及热处理时间的增长,镀层由Fe2Al5相进一步转变成铁含量高、韧性高的FeAl、Fe3Al相。
1Cr17 ferritic stainless steel as substrate in the molar ratio of 2: 1 acidic AlCl3-EMIC (1-methyl-3-ethyl imidazole chloride) room temperature molten salt electrodeposited uniformly dense aluminum coating, and then at 300 ℃, 650 ℃, 6 and 70 ℃ for different time. The bond strength of the coating was judged by the scribing tear method. The microstructure of the sample after heat treatment was analyzed by SEM, EDS and XRD. The results show that after the heat treatment, the bonding strength has been greatly improved, and the intermetallic diffusion occurs between the coating and the substrate to form an alloy layer composed of Fe2Al5, FeAl, Fe3Al and other phases containing Cr, and as the temperature increases and The growth of heat treatment time, the coating further transformed from Fe2Al5 phase into FeAl, Fe3Al phase with high iron content and high toughness.