Electrochemical polishing method for high purity aluminum under ultrasonic agitation
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A technology of ultrasonic stirring and electrochemistry, applied in the field of material chemistry and electrochemistry
Inactive Publication Date: 2008-10-29
DALIAN UNIV OF TECH
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Embodiment 1
[0018] The steps of electrochemical polishing under ultrasonic stirring are as follows:
[0019] (a) Clean the high-purity aluminum foil with a purity of 99.99% and a thickness of 0.15 mm in deionized water after ultrasonic vibration for 5 minutes in absolute ethanol;
[0020] (b) Dip in 1.5mol l -1 , remove the natural oxide film in sodium hydroxide at 60°C for 30s, and immediately immerse it in 1.5mol l -1 Neutralize in nitric acid for 15s, rinse with deionized water, and blow dry;
[0021] (c) The above-mentioned pretreated aluminum foil is used as an anode, the platinum sheet is used as a cathode, and the reference electrode is a saturated calomel electrode. The electropolishing solution is composed of 70-72% perchloric acid and 99.7% absolute ethanol, and the volume ratio is 5:1.
[0022] (d) Put electrolytic cell into ultrasonic cleaning machine, control ultrasonic frequency to be 40kHz, carry out electrochemical polishing on potentiostat, polishing time is 2min, and ...
Embodiment 2
[0028] The steps of electrochemical polishing under ultrasonic stirring are as follows:
[0029] (a) Clean the high-purity aluminum foil with a purity of 99.99% and a thickness of 0.15 mm in deionized water after ultrasonic vibration for 5 minutes in absolute ethanol;
[0030] (b) Dip in 1.5mol l -1 , remove the natural oxide film in sodium hydroxide at 60°C for 30s, and immediately immerse it in 1.5mol l -1 Neutralize in nitric acid for 15s, rinse with deionized water, and blow dry;
[0031] (c) The above-mentioned pretreated aluminum foil is used as an anode, the platinum sheet is used as a cathode, and the reference electrode is a saturated calomel electrode. The electropolishing solution is composed of 70-72% perchloric acid and 99.7% absolute ethanol, and the volume ratio is 8:1.
[0032] (d) Put electrolytic cell into ultrasonic cleaning machine, control ultrasonic frequency to be 50kHz, carry out electrochemical polishing on potentiostat, polishing time is 3min, and ...
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Abstract
The invention relates to an electrochemical polishing method for the high purity aluminium under ultrasonic agitation, which belongs to the fields of the material chemistry and the electrochemistry. The electrochemical polishing method under the ultrasonic agitation comprises the following steps: high purity aluminium foil is added in absolute ethyl alcohol, so as to be cleaned with deionized water and through ultrasonic oscillations, and the natural oxide film in sodium hydroxide is removed; the aluminium foil after being pretreated is used as an anode, the platinum sheet is used as the cathode, the reference electrode is saturated calomel electrode, and the electropolishing solution is the mixed liquor composed of absolute ethyl alcohol and perchloric acid; the electrolysis vessel is positioned in an ultrasonic wave cleaner, and electrochemical polishing is performed on a constant potential rectifier. The self-organizing structure with nanoscale stripe shape is formed on the aluminium surface, the structure is observed by adopting the atomic force microscopy, and the size of the stripe-shaped nanostructure changes under the ultrasonic agitation; the composition of the polishing surface is analyzed through the Raman spectrum and the X-ray diffraction, so as to indicate that the composition of the polishing surface is amorphous aluminum oxide.
Description
technical field [0001] The invention relates to an electrochemical polishing method for high-purity aluminum under ultrasonic stirring, which belongs to the field of material chemistry and electrochemistry. Background technique [0002] Porous anodized aluminum oxide membranes have not only attracted great attention in the preparation of nanomaterials and nanostructures due to their excellent self-organization, highly regular arrays, and ordered nanopores, but also have great development in the fields of electronics and information storage. potential. The porous aluminum oxide film produced by anodizing aluminum can be used as a one-dimensional nanostructure template on the one hand to prepare nanotubes, nanowires, nanocolumns, etc. The preparation method is simple, the cost is low, it can be prepared in a large area, and the pore size and film thickness can be controlled by changing the oxidation conditions, so that the porous anodic aluminum oxide film has been paid more ...
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