Preparation method of low-voltage formed foil for solid aluminum electrolytic capacitor

• Main Authors: MOU LUNSHENG, YANG HAILIANG, MAI JIANHANG, CHEN JINXIONG, RAN LIANG
• Format: Patent
• Language: Chinese; English
• Published: 28.03.2023
• Subjects: APPARATUS THEREFOR; BASIC ELECTRIC ELEMENTS; CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES ORLIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE; CHEMISTRY; ELECTRICITY; ELECTROFORMING; ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; METALLURGY; PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTIONOF COATINGS

The invention discloses a preparation method of a low-voltage formed foil for a solid aluminum electrolytic capacitor. The preparation method comprises the following steps: firstly, soaking the low-voltage corrosion foil for the aluminum electrolytic capacitor in a liquid containing a hydroxylamine organic matter, and then treating under the protection of inert gas, so that the electrostatic capacity of the low-voltage corrosion foil is improved by 2-8% compared with that of the low-voltage corrosion foil before treatment; and then a three-stage electrochemical anodic oxidation process is adopted, and in each stage of anodic oxidation process, low current density is adopted. The low-voltage formed foil prepared by the improved process has higher electrostatic capacity, more stable performance and longer service life, the solid aluminum electrolytic capacitor prepared from the low-voltage formed foil has better electrostatic capacity and service life (especially high-temperature service life), and the requirem