Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/11341
標題: 低碳鋼表面化成 Mn-Fe layered double hydroxide保護層及其於0.85M H2SO4水溶液抗腐蝕特性研究
Formation of Mn-Fe layered double hydroxide conversion layer on low carbon steel and its corrosion resistance in 0.85M H2SO4 aqueous
作者: 陳浩翰
Chen, Hao-Han
關鍵字: JIS G313122 低碳鋼
JIS G313122 mild steel
Mn-Fe LDH
腐蝕電流密度
極化測試
Mn-Fe Layered double hydroxide (LDH)
corrosion current density
polarization test
出版社: 材料科學與工程學系所
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摘要: 以低碳鋼建造濃硫酸儲存槽具有較低的成本,但其於濃硫酸水溶液中的抗腐蝕能力仍低於不銹鋼,因此有必要提升之。本研究試圖提供JIS G3131 低碳鋼一個環保的化成皮膜處理。將JIS G3131低碳鋼浸入酸性 Mn2+/ Cl-/ HCO3–/ CO32–水溶液於70 ºC下進行化成處理,再將試片浸入鹼性HCO3–/ CO32–水溶液化成處理,可於JIS G3131低碳鋼表面成長錳鐵層狀雙層氫氧化物(Mn-Fe LDH)皮膜。極化試驗結果顯示 Mn-Fe LDH 有助於抗腐蝕能力的提升。在0.85M 硫酸溶液的極化試驗中發現,Mn-Fe LDH 的平均腐蝕電位為 E(corr)為 -0.386 V Ag/AgCl及平均腐蝕電流密度I(corr)為 14.87 μA/cm2 明顯優於原材 JIS G3131 低碳鋼。(Ecorr~-0.468 Ag/AgCl , Icorr~738.3 μA/cm2 )。
The cost of mild steel build concentrated sulfuric acid storage tanks is much lower than the abovementioned stainless steels. However, the carbon steel has higher corro-sion rates than stainless steels.The corrosion of mild steel in the industry by concentrat-ed sulfuric acid is a great concern.The study explored the environmental clean method of the adhesion on coated JIS G3131 mild steel. The JIS G3131 samples were treated in pH 0.3 Mg2+/ Cl-/ HCO3–/ CO32– aqueous at 70 ºC with CO2 being bub-bling into the above solution continuously, and then immersing it in pH 12.0 HCO3‐/CO32‐ aqueous at 70 ºC. An Mn–Fe–CO3 LDH film was thus formed on the JIS G3131.According to corrosion test in aqueous 0.85M H2SO4, the Mn–Fe–CO3 LDH film coated sample had a much higher the corrosion resistance than the raw material (JIS G3131). The corrosion potential (E(corr)) of the coated mild steel sample was -0.386 V Ag/AgCl and corrosion current density (Icorr) of the coated mild steel sample was 14.87 A/cm2. (The JIS G3131 mild steel had Ecorr~-0.468 Ag/AgCl , and Icorr~738.3 μA/cm2 )
URI: http://hdl.handle.net/11455/11341
其他識別: U0005-0807201315152900
文章連結: http://www.airitilibrary.com/Publication/alDetailedMesh1?DocID=U0005-0807201315152900
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