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| 題 名 | 鋼底材矽含量對熱浸鍍鋅鍍層破裂及腐蝕行為的影響=The Effect of Silicon Content in Steel Substrates on the Cracking and Corrosion Behavior of the Galvanized Coatings |
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| 作 者 | 謝祐原; 王朝正; | 書刊名 | 防蝕工程 |
| 卷 期 | 38:3 2024.09[民113.09] |
| 頁 次 | 頁13-26 |
| 分類號 | 472.16 |
| 關鍵詞 | 熱浸鍍鋅; 彎曲試驗; 破裂機制; 耐蝕性; Hot-dip galvanizing; Bending testing; Crack mechanism; Corrosion resistance; |
| 語 文 | 中文(Chinese) |
| DOI | 10.6376/JCCE.202409_38(3).0002 |
| 中文摘要 | 本研究使用含矽 0.17 wt. %的 A36 低碳鋼和極低矽 (0.001 wt. %)的 SPCC 低碳鋼為底材,於 450 ℃ 進行熱浸鍍鋅,搭配不同熱浸鍍時間獲得 50 μm 及 100 μm 之鍍層。透過 SEM 和 EDS 分析不同鍍層結 構截面形貌,並透過微硬度測試各相的硬度。試片進行 5 ~ 20的彎曲試驗。以 OM 分析鍍層結構的裂 紋生長機制和鍍層厚度對裂紋生長的影響。最後,進行腐蝕試驗比較並觀察鍍層經彎曲後的腐蝕特性。 結果顯示,增加 Delta 相厚度能承受更高殘餘應力,降低初始裂紋密度。當受力應變量超過降伏,將以 擴張原有裂縫之方式達成變形。A36 鋼的鍍層附著性差,裂紋易偏轉至底材與鍍層界面,成為腐蝕通 道,導致鍍層剝落。 |
| 英文摘要 | This study applied silicon-containing A36 low-carbon steel (0.17 wt.% Si) and the very low-silicon SPCC low-carbon steel (0.001 wt.% Si) as substrates. These substrates were then treated with hot-dip galvanizing at a temperature of 450 ℃. The coating thickness was varied between 50 μm and 100 μm, depending on the immersion duration. The cross-sectional morphology of the coatings was analyzed through SEM and EDS, and the hardness of individual phases was determined using microhardness testing. The bending testing was conducted within the range of 5 to 20 degrees. The fracture propagation mechanisms and the effect of coating thickness on crack development were analyzed using optical microscopy (OM). Moreover, corrosion testing was performed to measure and evaluate the corrosion resistance of the coatings following bending. The results revealed that increasing the thickness of the delta phase enhanced the ability to withstand higher residual stresses and reduced initial crack density. Deformation occurs when the strain surpasses the yield point, leading to the expansion of pre-existing fractures. The adhension of A36 steel coating was inadequate, as cracks tended to deflect towards the interface between the substrate and coating. The cracks acted as mechanisms for corrosion easy-path and resulted in the delamination of the coating. |
本系統中英文摘要資訊取自各篇刊載內容。