采用极化曲线测定和恒电位集气研究铝在NaCl溶液中的电化学行为。NaCl溶液中添加入不同的阴离子后,铝的孔蚀电位和负差数效应系数会发生改变。不同阴离子使铝的负差数效应系数变化趋势和孔蚀活化电位变化趋势的不一致性说明铝电极的负差数效应现象是中间产物的低价离子在溶液中的化学反应造成的。
The electrochemical behavior of aluminum in 0.5mol/L NaCl and 0.49mol/L NaCl+0.01mol/L NaX (X=Cl-, Br-, I-, F-, NO3-, SO42-) solutions was studied by potentiodynamic method and potentiostatic hydrogen gathering measurements. When the above-mentioned anions were added into the solution, the breakdown potential and negative difference effect (NDE) of aluminum were found to change. The breakdown potential shift resulted from the anion competitive adsorption on aluminum surface in the solution. The change of NDE could be explained by the theory of hard-soft-acid-base (HSAB). The inconsistency ofchanging trend of the breakdown potential with NDE implied that NDE of aluminum was probably caused by low valence Al+ chemical reaction in solution.
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