本研究以SB450、430、304、310四種商用合金，於750℃與850℃、空氣與氯化鈉蒸汽(500vppm)之流動混合氣氛進行高溫腐蝕實驗，並藉由熱重動力學曲線、金相截面與SEM/EDS微觀分析及EPMA等方式，瞭解各合金之高溫腐蝕行為。相較於空氣氣氛之單純氧化，合金在空氣與氯化鈉蒸汽混合氣氛之腐蝕速率明顯增加。腐蝕動力學曲線顯示，金屬損失與重量增加隨拋物線率進行，含鎳之304與310合金具有較少之金屬損失，但總侵蝕深度與430合金相似。此外，於750℃時，四種合金試片氧化層表面可觀察到Fe2O3鬚晶；當溫度提高至850℃，則只能在430合金表面發現相同之鬚晶生成。

The high temperature corrosion behavior of four Fe-based commercial alloys containing SB450, 430, 304, and 310 was studied at 750℃ and 850℃ in Air-500vppm NaCl(g) atmospheres. The corrosion mechanism of the alloys was evaluated in terms of thermodynamic curves, scale morphology by SEM/EDS and OM, and EPMA analysis. The corrosion rates extremel significantly increased in air-NaCl(g) atmospheres than those in air. From the corrosion kinetics, the weight gain by oxide formation and metal loss followed the parabolic rate low. Alloys containing nickel reveal less metal loss, but the total depth of attack was similar to that of 430 alloy. In addition, as alloys oxidation at 750℃, Fe2O3 whiskers were observed on the outermost of the oxide scale. However, Fe2O3 whiskers only grew on the oxide surface of 430 steel when alloys corroded at 850℃.

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