香草醛在含50 V% 乙二醇低氯離子溶液中對AA6060鋁合金之腐蝕抑制研究;Corrosion inhibition of AA6060 with vanillin in dilute chloride solutions of 50 V% ethylene glycol

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Title:	香草醛在含50 V% 乙二醇低氯離子溶液中對AA6060鋁合金之腐蝕抑制研究;Corrosion inhibition of AA6060 with vanillin in dilute chloride solutions of 50 V% ethylene glycol
Authors:	陳建甫;Chen,Jian-Fu
Contributors:	材料科學與工程研究所
Keywords:	鋁合金;電化學;腐蝕;抑制劑;corrosion inhibitors;electrochemistry;aluminum alloys
Date:	2012-07-10
Issue Date:	2012-09-11 18:13:41 (UTC+8)
Publisher:	國立中央大學
Abstract:	本論文探討鋁合金6060(AA6060)於40℃、50℃、60℃以及70℃之50 V%乙二醇水溶液中，利用氯化鈉( 2.5 x 10-5 , 5.0 x 10-4, 5.0 x 10-3, 5.0 x 10-2 M)調配腐蝕環境並以生物可降解之香草醛作為腐蝕抑制劑之可行性量測，論文以三極式電化學法(線性極化、Tafel極化、交流阻抗)來量測不同條件參數(如:抑制劑濃度、溫度、氯化鈉濃度等)對鋁合金6060腐蝕抑制效率的影響。電化學實驗後鋁合金6060之則採用SEM、AFM進行表面形貌觀察，FTIR以分析香草醛的吸附狀態及XPS進行腐蝕生成物的探討。重量損失法以及電化學量測實驗結果均顯示，添加香草醛腐蝕抑制劑濃度為1.0 x 10-6 M時有最佳之抑制效率，在氯離子含量5.0 x 10-4 M時抑制效率達到68.44%。隨著腐蝕液環境之溫度上升以及氯化鈉濃度增加下，抑制劑之抑制效率有下降趨勢。由Tafel極化法顯示，香草醛屬於混合型抑制劑。此類抑制劑在鋁合金上呈現Langmuir等溫吸附模式之吸附。根據Arrhenius方程式求出:不含抑制劑時鋁合金遭受腐蝕之活化能為34.19(KJ/mol)，當抑制劑添加後，其活化能上升。This study examines the use of vanillin for improveing of corrosion resistance of aluminum alloy 6060 (AA6060) alloy in 50 V% ethylene glycol solution contains different levels of chlorine ions( 2.5 x 10-5 , 5.0 x 10-4, 5.0 x 10-3, 5.0 x 10-2 M) at different environment temperature(40℃,50℃,60℃,70℃).Weight loss, Tafel polarization, linear polarization resistance and electrochemical impedance spectroscopy measurements were employed to study the corrosion behavior of AA6060 alloy. All the experiments were carried out in a standard three-electrode cell where a platinized titanium mesh was the counter electrode and an Ag/AgCl electrode was a reference. Tafel polarization that is used to measure areas of corrosion rate and inhibitor effectiveness. The electrochemical measurements for AA6060 alloy in test solutions showed that the presence of chlorine ion significantly increases the corrosion rates, corrosion current densities (Icorr), simultaneously decreases the values of polarization resistance (Rp). The inhibition efficiency increases significantly with increasing of tiny vanillin concentration. The analysis of SEM & AFM confirmed the formation of precipitates of vanillin on the metal surface, which reduced the overall corrosion reaction. XPS to investigate surface corrosion of the structure of the resultant , FTIR analysis of adsorbed layer bonding state.Tafel polarization method showed that the vanillin are mixed type inhibitors. Vanillin showing the adsorption of the Langmuir isotherm model in this environment. Accordance to the electrochemical results show that corrosion environment contain tin vanillin changes its effectiveness in preventing passivity loss for AA6060 in chloride media.
Appears in Collections:	[Institute of Materials Science and Engineering] Electronic Thesis & Dissertation

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