本研究是在實融室矗立重抽蠣續廢氣在自0-捌℃之模儷氣氛，以比較不同矽含量之值合金唱的腐蝕壘，並在現場做試翰，結果顯示含o.晶wt%Si的鋼材比含0.21wt%Si者具輯佳之說 蝕性。歇地℃下，腐蝕生屁輔之X光揖射分析和EPMA分析顯示說蝕棋構是Si比Fe優先氧化，產生含Si氧化鐘於輯皮和塵封界面，阻止饋離子或氧離子擴散，而前者謂材之含Si氧化錯比聳者更，.﹒增加離子受阻曬之路徑，腐蝕速�因而降值。

This work is to develop a simulated flue gas of combustion heavy oil in laboratory， and to investigate the effect of silicon content in a low alloy steel on the corrosion at 250 - 500°C. Field test was also done. The result indicates that the steel with 0.46 wt% Si possesses better corrosion resistance than that with 0.21 wt% Si. X-ray diffraction and EPMA studies reveal that the corrosion resistant mechanism is due to the preferential oxidation of Si over Fe. Iron oxide rich in Si is produced at the scale/base metal interface and retards further diffusion of iron ions or oxygen ions. Furthermore， the Si rich-iron oxide of the: former steel is thicker than that of the latter steel and may promote the path of the retardation of ions. The corrosion rate is thus reduced.