Six-stage formation process of high-stability high-voltage anode foil

Abstract

The invention relates to a six-stage formation process of a high-stability high-voltage anode foil. The invention discloses a six-stage formation process of a high-stability high-voltage anode foil. The six-stage formation process comprises the following steps: (1), performing pretreatment; (2), performing primary formation; (3), performing secondary formation; (4), performing monobutyl phosphatetreating 1; (5), performing third-stage formation; (6), performing fourth-stage formation; (7), carrying out sheet burning treatment 1; (8), performing phosphoric acid treatment 1; (9), performing five-stage formation; (10), performing' six-stage formation; (11), performing phosphoric acid treatment 2; (12), repairing the rear end 1; (13), performing phosphoric acid treatment 3; (14), repairing the rear end 2; (15). carrying out sheet burning treatment 2; (16), repairing the rear end 3; and (17), performing post-treatment. The six-stage formation process of the high-stability high-voltage anode foil is simple in process and easy to operate, the high-stability high-voltage anode foil can be produced in batches, and the produced anode foil has the multiple advantages of being high in capacity, low in electric leakage, high in bending and high in hydration resistance.

Description

technical field [0001] The invention belongs to the technical field of electrode foils, and in particular relates to a six-stage chemical formation process of high-voltage high-voltage anode foils with high stability. Background technique [0002] With the progress of society, people have put forward higher requirements for the life and quality of aluminum electrolytic capacitor products. Anode foil for aluminum electrolytic capacitors (hereinafter referred to as anode foil) is the key raw material for the manufacture of aluminum electrolytic capacitors. The chemical formation process of anode foil largely determines the performance of anode foil products. At present, in order to increase the capacity of the anode foil, organic acids such as citric acid and adipic acid are mostly used to form it, but there are problems of large leakage current and poor hydration resistance, which seriously affect the service life of the capacitor. [0003] The organic acid processes such as...

AI Technical Summary

Problems solved by technology

However, when the addition amount is too much or the formation voltage is too high, many problems such as anode foil corrosion, anode foil surface flash fire, and formation liquid whitening will occur, thus limiting the addition concentration of inorganic phosphoric acid or phosphate and the applicable upper limit of formation voltage

Since more phosphorus cannot be incorporated into the oxide film of the high-voltage anode foil, the effect of improving the hydration resistance of the anode foil and reducing the defects of the oxide film is limited

[0005] In the prior art, organic phosphine substances such as hydroxyethylidene diphosphonic acid, sodium ethylenediamine tetramethylene phosphonate, polyamino polyether group methylene phosphonic acid are added to the post-treatment liquid to improve the hydration resistance of the anode foil surface method, but this technology only acts on the surface of the anode foil, and cannot improve the overall hydration resistance and stability of the anode foil

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