本研究已建立加速大氣腐蝕模擬技術，並將其所得到之數據與既有之長期大氣腐蝕暴露試驗結果加以比較，以發展可靠而快速的耐候鋼耐蝕性質評估方法。並利用此新方法，配合腐蝕產物的分析，來評估稀土元素的添加對於耐候鋼耐蝕性質的影響。
　　
為達到加速大氣腐蝕，利用烘烤處理及第二階段乾溼循環暴露試驗，並研究不同稀土元素含量之耐候鋼在0.05 wt% NaCl水溶液中模擬在大氣條件下的銹蝕演化過程，並將所得之銹層以掃描式電子顯微鏡（Scanning Electron Microscope，SEM）、X光繞射儀（X-Ray Diffraction Spectroscopy，XRD）和恆電位儀進行分析，探討合金元素對耐候鋼於低濃度NaCl環境下銹層生成過程的影響與作用機制。
　　
試驗結果顯示，稀土金屬含量0.0016 wt% 耐候鋼裸材有較負的腐蝕電位；在腐蝕初期的腐蝕速率隨著循環次數而呈線性增加，界面反應控制；腐蝕產物組成為γ-FeOOH、Fe3O4和α-FeOOH；銹層橫截面形貌發現有內外銹層存在以及結構和元素分佈差異，然而保護性銹層尚未形成；各耐候鋼表面銹層在0.05 wt% NaCl水溶液中的極化曲線有明顯的差異。
乾溼循環暴露試驗後再施以烘烤處理，銹皮組成改變，由非晶質銹及Fe3O4組成；銹層缺陷及裂縫顯著減少，且銹層與基材界面的附著性獲得提升。動電位極化曲線顯示：不同稀土含量耐候鋼銹層的腐蝕電位及陰、陽極電流密度差異也變小。

烘烤處理後再進行第二階段乾溼循環試驗，發現低稀土金屬添加量耐候鋼腐蝕速率隨著循環次數而漸減，是擴散機制，而較高稀土金屬添加量耐候鋼仍為界面控制，稀土金屬含量多寡確實影響銹層厚度及重量；耐候鋼銹層轉為結晶相，橫截面的緻密性及附著性更佳；在0.05 wt% NaCl水溶液中的腐蝕電位提高，抑制陽極氧化反應。

The chemical compositions and structures of the rusts formed on the surfaces of rare earth (RE) containing weathering steels, after laboratory-accelerated test, with and without baking treatment, were characterized using XRD、SEM and EDS. Potentiodynamic polarization curve measurement was employed to evaluate the stability of the rust formed under different condition. The effect of rare earth element on the atmospheric corrosion resistance was explored.
The experimental results showed that the bare steel containing 0.0016 wt% RE had the lowest corrosion potential in 0.05 wt% NaCl solution. After cyclic wet/dry alternating exposure in the fog containing 0.05 wt% NaCl solution, the as-formed rust consisted of α-FeOOH、γ-FeOOH and Fe3O4, while the inner and outer scales gad different chemical composition and structure.
Further baking treatments at 150oC for 15 days, the rust underwent phase transformation from crystalline to amorphous phase. In addition, the defect density decreased and adhesion between the substrate and rust increased. The polarization curves of the specimens with baking treatment had almost similar feature in 0.05 wt% NaCl solution.
Further wet-dry cyclic exposure caused the transformation of the rust from amorphous to crystalline phase again. A more compact and good adherence between the substrate and rust was obtained. In 0.05 wt% NaCl solution, the corrosion potential was further increased and the anodic current density was reduced.

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