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测试了高纯电子铝箔 (以下简称铝箔 )在 2mol/LHCl和 2mol/LHCl+0 5mol/LH2 SO4溶液中三角波动电位激励时的电流响应曲线 ,用Daubechies2小波对所测得的电流响应曲线进行了时频分解 ,研究了SO2 -4在铝箔交流扩面电蚀工程中的缓蚀机理 .提出了铝箔在含Cl-溶液中点蚀时的氧空位侵蚀机理模型 ,该模型指出在一定的酸度条件下 ,在侵蚀膜表面形成的正电荷集中点是Cl-与SO2 -4发生特性吸附的原因 ;Cl-在侵蚀膜内的主要传输途径是存在于侵蚀膜内微晶晶界上的氧空位链 ;进入侵蚀膜内的SO2 -4在强场作用下发生离解 ,离解出的O2 -与侵蚀膜内的氧空位作用 ,致使氧空位湮灭 ,切断了Cl-在侵蚀膜内的传输途径 ,同时由于这种作用调整了Cl-在侵蚀膜内传输的网络结构 ,增加了蚀孔内新生蚀孔的萌生机率 ,从而在铝箔电蚀扩面腐蚀工程中起到了独特的缓蚀作用
The current response curve of high purity electronic aluminum foil (hereinafter referred to as aluminum foil) excited by the triangular wave potentials in 2mol / LHCl and 2mol / LHCl + 0 5mol / LH 2 SO 4 solutions was tested. The measured current response curve was carried out by Daubechies 2 wavelet The time-frequency decomposition is used to study the corrosion inhibition mechanism of SO2-4 in the electro-erosion process of aluminum foil AC expansion. The mechanism of oxygen vacancy erosion when aluminum foil is pitting in Cl- solution is proposed. The model indicates that under certain acidity conditions , The positive charge concentration point formed on the surface of the erosion film is the reason for the characteristic adsorption of Cl- and SO2-4. The main transport path of Cl- in the erosion film is the oxygen vacancy chain existing in the microcrystalline grain boundary in the erosion film ; SO2-4 entering the erosion film is dissociated by the action of strong field, the dissociated O2 - and the oxygen vacancies in the erosion film cause annihilation of oxygen vacancies and cut off the transmission pathway of Cl- in the erosion film, meanwhile, due to This effect adjusts the network structure of Cl- transported in the erosion film and increases the probability of new pitting initiation in the etching hole and thus has a unique corrosion inhibition effect in the erosion expansion coating of aluminum foil