本文運用低溫滲碳法針對316 不銹鋼作表面硬度強化。此法的優點能夠避免 不銹鋼表面析出鉻碳化物(Cr7C3)而降低耐腐蝕性，不僅提升材料的表面硬度及耐 磨性，同時仍保有其原有的韌性。試片在執行低溫滲碳前必須經過表面活化處理 以除去表面的鈍化膜(Cr2O3)。本研究使用鹽酸氣體在不同的可變參數下進行表面 活化，並在低溫滲碳後執行顯微組織和表面硬度的分析，以釐清不同表面活化參 數對於低溫滲碳效果的影響。從顯微組織的分析發現，以加熱鹽酸的方式進行表 面活化後，接續執行低溫滲碳的不銹鋼試片表面皆有滲碳層的生成，其中滲碳效 果最佳的試片其滲碳層厚度可達約12μm。從表面硬度的分析發現，當滲碳層厚度 越高，其表面硬度也越高，表面硬度最高可達約722 HV0.01，硬度增加率最高可達 101%。

Low-temperature carburization treatment is applied on 316 stainless steels for surface hardness improvement. This treatment not only can prevent the precipitation of the chromium carbides (Cr7C3) from the surface of samples which reduces corrosion resistance, but also enhance the surface hardness and wear resistance, and maintain its original toughness. Before applying low-temperature carburization on samples, the surface activation treatment must be applied on them to remove the passivation film (Cr2O3) on sample surfaces by using hydrochloric acid gas. After low-temperature carburization treatment, the microstructure and surface hardness of samples are analyzed to clarify the effect of different surface activation parameters. From the analysis of the microstructure, it was found that the carburized layer was formed on sample surfaces with a maximum thickness of about 12μm. From the analysis of the surface hardness, it was found that higher the thickness of the carburized layer, higher the surface hardness. The surface hardness is increased by 101%.