Electro-corrosion machining of aluminum in alkaline solution and passivated mechanism
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摘要: 采用电解腐蚀装置，研究铝芯轴在1 mol/L的氢氧化钠溶液中4~28 V电压条件下的电流随时间的变化，得到电压与稳定时刻电流的关系曲线。通过改变电解液温度(20~35 ℃)，对数据拟合后得到活化能。当电压高于28 V时，铝表面完全钝化，采用扫描电子显微镜得到未钝化样品和钝化样品的表面形貌，采用X射线衍射仪对未钝化样品和钝化样品进行分析表征，得出了钝化样品表面钝化层的主要成分为三羟铝石。从钝化产物的主要成分，推断出表面反应过程及钝化机理。Abstract: Aluminum mandrel was electrolyzed in 1 mol/L sodium hydroxide solution using the electrolytic corrosion device. The relationship between voltage and current was got by changing the voltage (4-28 V). The surface of aluminum was absolutely passivated when the voltage was higher than 28 V. Activation energy was obtained from data fitted by changing the electrolyte temperature (20-35 ℃). Images of surface passivation samples and non-passivated sample were got from SEM. Non-passivated and passivated samples were analyzed and characterized by XRD. The main component of surface passivation layer was bayerite. Surface reaction process and passivated mechanism were inferred from the main component of passivation product.
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Key words:
- aluminum /
- sodium hydroxide /
- electrolysis /
- activation energy /
- passivation
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