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研究了加载直流电压条件下己二酸铵对2024-T3铝合金阳极氧化膜的封闭效果,从而提出一种新型封闭方法。采用场发射扫描电子显微镜(FE-SEM)和能量散射谱(EDS)对封闭前后阳极氧化膜的微观形貌和成分进行了分析。采用动电位极化技术、电化学阻抗谱(EIS)和盐雾腐蚀实验研究了加载直流电压条件下己二酸铵封闭后铝合金硫酸阳极氧化膜的耐腐蚀性能,并与重铬酸钾封闭、沸水封闭进行了对比。结果表明:加载直流电压条件下己二酸铵封闭可以有效闭合多孔层微孔,对阳极氧化膜的缺陷空穴进行填充,修补阻挡层中的缺陷,提高阻挡层厚度,其耐腐蚀性与重铬酸钾封闭效果相当,优于沸水封闭效果。
The effect of ammonium adipate on the anodic oxide film of 2024-T3 aluminum alloy under direct current (DC) voltage was studied. A new sealing method was proposed. The morphology and composition of the anodic oxide films before and after sealing were analyzed by field emission scanning electron microscopy (FE-SEM) and energy dispersive spectroscopy (EDS). The corrosion resistance of aluminum alloy sulfuric acid anodic oxide film was investigated by potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and salt spray corrosion experiments under the condition of direct current voltage and closed with potassium dichromate , Boiling water closed for comparison. The results show that ammonium adipate blockade can effectively close the pores of the porous layer under the condition of direct current voltage, fill the defect holes in the anodized film, repair defects in the barrier layer, increase the thickness of the barrier layer, Chromic acid closure effect is quite good, better than boiling water closed effect.