本實驗使用低碳鋼1005、中碳鋼1040以及高碳鋼1080之商用鋼料做為底材，再利用正常化、爐冷、水淬與球化等熱處理方法使其得到不同種微結構後進行700℃的熱浸鍍純鋁，探討碳鋼微觀組織對熱浸鋁時，鋁化層及外部鋁層成長之作用。
實驗結果顯示，熱浸鍍鋁後試片之塗層由外而內分別為外鋁層、鐵鋁介金屬層以及不同微結構組織之底材，其中鐵鋁介金屬層主要為Fe2Al5。碳鋼中的碳，無論是以固溶碳、球形雪明碳體或波來體的型式存在，均會阻礙Fe2Al5相的成長，因此鋼料之碳含量越低，Fe2Al5層之成長越多。Fe2Al5層之均勻性會被底材碳的分佈所影響，當碳的分佈越均勻，Fe2Al5層之厚度的變異量越小。影響外部鋁層厚度之最大因素為鋁層中碳化物的含量，外部鋁層之厚度隨鋼料內碳化物之增加而增厚，但其厚度變異量則不受鋼料內碳含量的影響，皆會隨熱浸時間的增加而縮小。

This experiment uses commercialized steel materials such as Mild Steel 1005, Medium Carbon Steel 1040 and High Carbon Steel 1080 as the substrate; then uses the heat treatment methods- normalizing, furnace cooling, quenching and spheroidizing to obtain various kinds of micro-structure. Finally, conducts 700℃ hot-dip aluminum, investigates the growth of aluminum layer and external aluminum layer on the carbon steel microstructure in hot dip aluminum.
The experiment results show that the specimen coatings in hot-dip aluminum, outer to inner layer are outer Al topcoat, Fe-Al intermetallic layer (mainly Fe2Al5), and various microstructures subtracts respectively. The carbon in the carbon steel, whether it is in the forms of carbon solid solution, spherical cementite or pearlite, all impede the growth of Fe2Al5, therefore the lower the carbon content in steel, the faster the Fe2Al5 layer grows. In addition, the uniformity of the Fe2Al5 layer is influenced by the distribution of the substrate carbon, the more uniform distribution of carbon, the smaller variance in Fe2Al5 layer thickness. Furthermore, the biggest factor affecting thickness of external aluminum layer is the amount of carbide in aluminum layer. The external aluminum layer thickness increases as the amount of carbide in steel material increases, while the thickness variances are not subject to amount of carbon in the steel materials, all specimen decrease in variance as increase in time of hot dip.

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