Preparation method of zinc anode oxidation film layer

A technology of oxide film layer and zinc anode, which is applied in the direction of anodic oxidation, etc., can solve the problems that the comprehensive application performance of the film layer is not reported in detail, the hardness of the film layer is low, and the application performance is poor, so as to improve corrosion resistance, simple preparation process, The effect of extending the service life

Inactive Publication Date: 2013-08-14
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among these studies, most of them focus on the field of photoelectric catalysis, and there are relatively few studies on corrosion, and the comprehensive application performance of the film layer has not been reported in detail. Zinc anodic oxidation generally requires a high DC voltage, up to more than 100 volts, resulting in energy consumption. Larger, the hardness of the film layer obtained by anodic oxidation is lower, and the application performance is poorer

Method used

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  • Preparation method of zinc anode oxidation film layer

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Effect test

Embodiment 1

[0014] The concrete processing steps of the present embodiment are:

[0015] (1) Substrate treatment: Grind the zinc sheet substrate (purity greater than 99.9%) with 1200-mesh SiC sandpaper, ultrasonically clean the surface with acetone, ethanol and deionized water for 5 minutes, and then seal it with sealant to form a working area of ​​side length 5mm square substrate zinc surface;

[0016] (2) Electrolyte preparation: Add cerium chloride, hydrochloric acid, boric acid and citric acid into distilled water and stir well until the solid matter is completely dissolved, then add ethyl orthosilicate, and use conventional magnetic stirring at 40°C Stir at a stirring speed of 200r / min for 5min to make it fully hydrolyzed to obtain a prepared electrolyte, wherein the concentration of cerium chloride is 0.01mol / L, the concentration of ethyl orthosilicate is 0.001mol / L, and the concentration of hydrochloric acid The concentration is 0.5g / L, the concentration of boric acid is 2g / L, and...

Embodiment 2

[0020] The concrete processing steps of the present embodiment are:

[0021] (1) Substrate treatment: ultrasonically clean the surface of the zinc-coated carbon steel substrate with acetone, ethanol, and deionized water for 5 minutes in sequence, and seal it with sealant after drying to form a square substrate zinc surface with a working area of ​​5mm side length;

[0022] (2) Electrolyte preparation: Add cerium chloride, hydrochloric acid, boric acid and citric acid into distilled water and stir well until all solid substances are dissolved, then add ethyl orthosilicate, and use a conventional magnetic stirrer at a temperature of 50°C Stir at a stirring speed of 200r / min for 5 minutes to fully hydrolyze it to obtain a prepared electrolyte, wherein the concentration of cerium chloride is 0.05mol / L, the concentration of ethyl orthosilicate is 0.003mol / L, and the concentration of hydrochloric acid 2g / L, the concentration of boric acid is 4g / L, and the concentration of citric aci...

Embodiment 3

[0025] The concrete processing steps of the present embodiment are:

[0026] (1) Substrate treatment: Grind the zinc sheet substrate with 1200-mesh SiC sandpaper, ultrasonically clean the surface with acetone, ethanol, and deionized water for 5 minutes in turn, and then seal it with sealant to form a square with a working area of ​​5mm side length;

[0027] (2) Preparation of electrolyte: Add cerium chloride, hydrochloric acid, boric acid and citric acid into distilled water and stir well until all solid substances are dissolved, then add ethyl orthosilicate, and use conventional magnetic force at 45°C The stirrer was stirred at a stirring speed of 200r / min for 5min to make it fully hydrolyzed, and the prepared electrolyte was obtained, wherein the concentration of cerium chloride was 0.03mol / L, the concentration of ethyl orthosilicate was 0.002mol / L, hydrochloric acid The concentration of boric acid is 1g / L, the concentration of boric acid is 3g / L, and the concentration of ci...

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Abstract

The invention belongs to the technical field of the surface treatment of a metal material, and relates to a preparation method of a zinc anode oxidation film layer. The method comprises the following steps of: firstly polishing a substrate through a piece of silicon carbide (SiC) abrasive paper, then ultrasonically washing the surface of the substrate by using the acetone, ethanol and deionized water sequentially, and packaging the substrate with sealing glue to form a square substrate zinc surface; adding cerium chloride, hydrochloric acid, boric acid and citric acid into the distilled water, adequately stirring until all solid substances are dissolved, and adding ethyl orthosilicate to ensure that all substances are adequately dissolved to obtain a prepared electrolyte; and depositing the oxidation film layer on the substrate zinc surface by adopting an anode electro-oxidation technology with the processed substrate as an anode, a platinum niobium wire as a cathode and a saturated calomel electrode as a reference electrode, thus forming the zinc anode oxidation film layer. The preparation process is simple, the cost is low, convenience in operation can be achieved, the repeatability is good, no large-sized expensive equipment is needed, and the prepared film layer can be used for the surface treatment of zinc products or different zinc-coated products.

Description

Technical field: [0001] The invention belongs to the technical field of surface treatment of metal materials, and relates to a preparation process of an electrolyte for preparing a corrosion-resistant thin film on the surface of zinc and zinc coatings and a coating thereof, in particular to a preparation method of an anodized zinc oxide film. The electrolyte and its coating are suitable for surface anticorrosion of various zinc coatings on zinc and steel surfaces. Background technique: [0002] In steel anticorrosion coatings, zinc is a widely used material. Zinc has high corrosion resistance in the atmosphere. However, when zinc coatings are applied to marine atmospheres or other harsh working conditions, corrosion will still occur relatively quickly. To improve the corrosion resistance of zinc coating, it is necessary to prepare a passivation layer on its surface. The traditional method is to use chromate for passivation. The chromate passivation process is simple, the cos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/34
Inventor 林志峰李相波许立坤
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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