Nano holing method on surface of low-voltage anode foil for aluminium electrolytic capacitor
A technology for aluminum electrolytic capacitors and low-voltage anode foils, which is applied in the manufacture of electrolytic capacitors, capacitors, and capacitors, and can solve problems such as poor applicability of general processes, increased industrial costs, and large quality dispersion of electrolytic aluminum foils.
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Embodiment 1
[0017] Example 1: Use acetone to remove the surface grease on the surface of the aluminum foil, remove the oxide film with NaOH, then place it in a polishing solution at 70 ° C, apply a voltage of 10 V to perform electrochemical polishing for about 5 minutes, and the composition of the polishing solution is phosphoric acid: Sulfuric acid: glycerol (v / v) = 115: 0.5: 85; using 3% (wt) H 3 PO 4 For the electrolyte, an anodic oxidation was performed once at 60V for 15 minutes, and a mixed solution of 15% (wt) phosphoric acid and 5% (wt) chromic acid was used to remove the film at 60°C until the surface exposed the aluminum matrix, and then the second oxidation and removal Membranes, the conditions were the same as the first time. Figure 1 is the SEM photo of the surface of the aluminum foil after secondary oxidation by the above process. It can be seen that there are relatively uniform corrosion holes distributed on the surface. The size of the holes is between 93 and 220nm, and ...
Embodiment 2
[0018] Example 2: According to the method in Example 1, the surface of the aluminum foil is routinely cleaned to remove oil and oxide film, and then it is placed in a polishing solution at 40°C, and a voltage of 6V is applied for electrochemical polishing for about 25 minutes. The composition is phosphoric acid: sulfuric acid: glycerol=150:0.7:100. Using 10% (wt) H 3 PO 4 As an electrolyte, an anodic oxidation is performed once at a voltage of 30V for 30 minutes, and a mixed solution of 6% (wt) phosphoric acid and 2% (wt) chromic acid is used to remove the film at 80°C until the surface exposes the aluminum matrix, and then perform secondary oxidation and removal. Membranes, the conditions were the same as the first time. On the surface of the aluminum foil, corrosion holes with a relatively uniform size were obtained, with an average pore diameter of 78nm.
Embodiment 3
[0019] Example 3: The surface of the aluminum foil is subjected to conventional surface cleaning such as degreasing and oxide film removal, and then it is placed in a polishing solution at 70° C., and a voltage of 18 V is applied for electrochemical polishing for about 3 minutes. The composition of the polishing solution is phosphoric acid: Sulfuric acid: glycerol=90:0.3:60. Using 8% (wt) H 3 PO 4 As an electrolyte, an anodic oxidation was performed once at a voltage of 80V for 15 minutes, and a mixed solution of 27% (wt) phosphoric acid and 10% (wt) chromic acid was used to remove the film at 40°C until the surface exposed the aluminum matrix, and then the second oxidation and removal Membrane, the conditions were the same as the first time. On the surface of the aluminum foil, corrosion holes with a relatively uniform size were obtained (see Figure 2). The size of the holes was between 136 and 274nm, and the average pore diameter was 220nm. In Figure 2, the thin lines are...
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Abstract
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