AISI 1005/1040/1080熱浸鋁塗層之顯微組織與高溫氧化

Microstructure and High-temperature Oxidation of Hot-dip Aluminide Coating on AISI 1005/1040/1080

本研究使用含碳0.05% ~ 0.80%之碳鋼進行熱浸鍍鋁，探討碳鋼底材之碳含量對鋁塗層浸鍍成長行為與高溫氧化的影響。實驗結果顯示，經熱浸鍍鋁後碳鋼的鋁塗層均是由純鋁層、鐵鋁介金屬層與波來鐵所組成；底材碳含量愈高，鐵鋁介金屬層成長厚度愈薄，塗層中的波來鐵含量也越多。碳鋼底材的碳含量愈低，熱浸鍍鋁後的抗高溫氧化性優於高碳底材。

In this study, the effect of carbon content in the steel on the growth and high-temperature oxidation behaviors of the hot-dipping aluminide layer was investigated by hot-dip aluminizing of AISI 1005, 1040 and 1080 carbon steels containing 0.05% ~ 0.80% carbon. The results show the hot-dipped aluminide coating consists of Al topcoat, Fe-Al intermetallic layer and pearlite. Steel substrate which contains higher carbon content exhibits thinner Fe-Al intermetallic layer and higher amount of pearlite trapped in the aluminide layer. In addition, the difference of carbon content between those steel substrates resulted in the diverse performance of high-temperature oxidation resistance of the aluminide coatings. Aluminide coating on the low carbon content steel exhibits a better oxidation resistance.