430不锈钢热浸镀铝(硅)之铝化层成长研究

The Growth of Aluminide-layer during the Hot-dipping Al-(Si ) Coating onto 430 Stainless Steels

使用430不锈钢于680至800℃下作熔融铝硅合金热浸处理,研究热浸温度及热浸时间对铝硅合金化层成长的影响及铝化层之成长动力学.结果表明,430不锈钢在680～800℃经热浸16～289 s后,表面镀层与铝化层之生成厚度随热浸时间及热浸温度而增加,铝化层之成长动力学符合拋物线定律,并因相互扩散而形成FeAl3及Fe2Al5相,金相截面观察显示,680℃热浸处理的合金化层界面平坦,而在800℃下的即趋于不规则.

The 430 stainless steels have been hot dipped in the molten Al-6.5% Si melts from 680 to 800℃, respectively. The effects of the hot dipping temperature and time on the thickness of the internal alloy layer have been investigated. The activation energy of the growth kinetic of aluminized layer was also calculated. The results showed that the thickness of aluminized layer increased with increasing dipping time and temperature. Besides, the growth kinetic of aluminized layer obeys parabolic rate law. The FeAl3and Fe2Al5were formed by the inward diffusion, and the interface of intermetallic layer will be rugged and rough at the 800℃ more than 680℃.