• 作者： Chu, C.M.; Wan, C.C.
• 中文摘要： 本文研究純鐵在檸檬酸溶液中之電溶解動力行為,利用定電位極化法。純鐵之溶解速率隨檸檬酸濃度增加而增加,而且與氫離子濃度之負0.5次方成正比。其陽極塔弗斜率(Tafel Slope)大約為130mV/decade。本文提出純鐵在檸檬酸溶液中之電反應機構,並以 Temkin恆溫吸附理論推導得電解速率方程式如下: i/sub a/=2Fk.theta.〔H/sup +/〕/sup -0.6/exp(0.4FE/RT)然而.theta.為Fe(Cit)/sub ads//sup 2-/被電極表面吸附之分率; k為組合速率常數。理論速率方程式與實驗結果相符合,即可確認提出之反應機構正確。
• 英文摘要： The dissolution kinetics of iron in citric acid solutions has been investigated by potentiostatic polarization. The dissolution rate of iron increased with an increase of citric acid and is proportional to.lbrak.H/sup +/.rbrak./sup -0.5/ (theoretical reaction order being -0.6). An anodic Tafel slope of approximately 130mV/decade was observed, but theoretical Tafel slope was 150mV/decade. The rate equation can be developed theoretically by a mechanism which involves two single-electron-transfer steps with Temkin isothermal adsorption and the equation deduced is as follows: i/sub a/=2Fk.theta.C/sub H+//sup -0.6/ exp(0.4FE/RT) where .theta. is surface coverage of Fe(Cit)/sub ads//sup 2-/, and k is combined rate constant. The experimental data can fit this theoretical model finally well.
• 中文關鍵字： 電溶解; 檸檬酸; Temkin恆溫吸附; 定電位極化法
• 英文關鍵字： Electrodissolution; Citric Acid; Temkin Isothermal Adsorption; Potentiostatic Polarization