A kind of composite lead dioxide electrode plate and its manufacturing method

Abstract

The invention discloses a composite lead dioxide electrode plate, which comprises a composite lead dioxide anode plate and a protective net covering the periphery of the composite lead dioxide anode plate, wherein the composite lead dioxide anode plate is arranged in a framework and comprises a plurality of small anode plates spliced and connected with one another; and each small anode plate comprises a titanium substrate, a transition layer coated on the titanium substrate, an alpha-PbO2 interlayer coated on the transition layer and a beta-PbO2 active layer coated on the alpha-PbO2 interlayer; and the transition layer comprises at least one component of Pt, IrO2, Ta and Ta2O5. Correspondingly, the invention also provides a method for manufacturing the composite lead dioxide electrode plate. The composite lead dioxide electrode plate prepared by the method has long service life, the passivation process is stable, and an excellent implementation effect is achieved.

Description

technical field [0001] The invention relates to an electrode plate and a manufacturing method thereof, in particular to a lead dioxide electrode plate and a manufacturing method thereof. Background technique [0002] Passivation treatment is an important part of the tinning process. The purpose is to form a dense passivation film on the surface of the tinned strip to prevent the oxidation of the tinplate in the air, thereby enhancing the corrosion resistance of the tinplate. Sex and finish. General passivation equipment is mainly composed of tank body, passivation solution, passivation electrode plate, conductive roller and rectifier, among which the passivation electrode plate is connected to the positive pole of the rectifier to provide the required current for passivation treatment, and the current passes through the passivation The chemical solution acts on the strip to form a passivation film on the surface of the strip. [0003] The passivation treatment of conventio...

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Problems solved by technology

Therefore, when low carbon steel is used as the passivated anode plate, the electrode plate should be replaced every 6 months or so, and the surface of the tinplate is heavily black and gray, which affects the surface quality and finish of the tinplate

[0005] 2. Low carbon steel electrode plate is easy to oxidize, resulting in unstable passivation effect

After the low-carbon steel electrode plate is immersed in the passivation solution, the oxidation reaction occurs quickly, and the products of the oxidation reaction include FeO, Fe 2 o 3 and Fe 3 o 4 , these oxides are continuously dissolved into the passivation solution during the formation process, and the composition of the oxides that play a role in the discharge during the different stages of the low-carbon steel electrode plate is constantly changing, resulting in unstable passivation effect and large changes in the thickness of the passivation film. , resulting in unstable quality of tinplate products

[0006] 3. The low-carbon steel electrode plate is easily impacted by the strip steel, causing scratches and damage: in the process of large-scale industrial production of tinplate, the strip steel runs at a high speed at a speed of 200-500m / min, and the passivation solution in the passivation tank Also 10 ~ 30m 3 The flow rate of / h circulates, and the distance between the strip steel and the electrode plate is only about 40mm. Therefore, when the shape of the strip steel plate is not good, it is easy to rub against the electrode plate and contact for a short time. At this time, the current is directly from the positive electrode plate. Transmission to the strip steel causes a short circuit, resulting in surface scratches and local burns on the positive electrode plate, and in severe cases, it will cause damage to the passivated electrode plate and cause the entire unit to stop production, affecting the stable production of the unit

[0007] The above three problems are unavoidable technical problems when the electro-tinning unit uses conventional low-carbon steel passivation electrode plates, so it is necessary to invent a new passivation electrode plate suitable for the passivation treatment of the tin-plating unit to solve the above problems

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