Method for preparing low-wetting and anti-corrosion multihole oxidation film

A porous oxide film and corrosion-resistant technology, applied in anodic oxidation and other directions, can solve problems such as unstable cohesion and complicated manufacturing process, and achieve the effects of simple and environmentally friendly preparation process, good hydrophobicity and good corrosion resistance

Inactive Publication Date: 2018-01-30
INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Organic coatings can reduce the surface wettability of metals and improve corrosion resistance, however, organic coating technologies for the hydrophobization of aluminum have some disadvantages
For example, the cohesion between organic compounds and alumina is unstable and the manufacturing process is complicated

Method used

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  • Method for preparing low-wetting and anti-corrosion multihole oxidation film
  • Method for preparing low-wetting and anti-corrosion multihole oxidation film
  • Method for preparing low-wetting and anti-corrosion multihole oxidation film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1: An aluminum plate (99.99% by mass, 350 μm thick) was used as a sample. The sample was ultrasonically cleaned for 600s (10 minutes) in absolute ethanol (mass fraction 100%), and then at a constant voltage of 28V at 13.6kmol m -3 Acetic acid and 2.56kmol m -3 Electrochemical polishing in perchloric acid mixed solution for 300s; after polishing, place the substrate at room temperature with a concentration of 0.45kmol -3 H 3 PO 4 In electrolytic solution, 100A m -2 Anodize under constant current density for 2 hours, then rinse with double distilled water; after rinsing, put the matrix sample in an oven to dry, slowly increase the temperature to 423K at a heating rate of 5°C / min, and keep warm for 12h (43.2ks) after reaching the highest temperature After that, the power of the oven was turned off, and the sample was slowly cooled to room temperature in the oven, thereby forming a porous oxide film on the surface of the aluminum substrate.

[0024] The water c...

Embodiment 2

[0025] Embodiment 2: The holding time in the drying process of Embodiment 1 is set to 8h (28.8ks), and other treatments are the same as in Embodiment 1, and its water contact angle measured by the water contact angle is 70°.

Embodiment 3

[0026] Embodiment 3: The holding time in the drying process of Embodiment 1 is set to 10h (36ks), and other treatments are the same as in Embodiment 1, and its water contact angle measured by the water contact angle is 84°.

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Abstract

The invention relates to an anti-corrosion oxidation film, in particular to a method for preparing a low-wetting and anti-corrosion multihole oxidation film on an aluminum surface. The method comprises the following steps: carrying out ultrasonic cleaning and electrochemical polishing in sequence on a matrix aluminum plate, then carrying out anodic oxidation on the matrix aluminum plate in an acidic solution, and drying the matrix aluminum plate, thereby forming the multihole oxidation film on the surface of the matrix aluminum plate, wherein the water contact angle of the multihole oxidationfilm exceeds 95 degrees, so that the multihole oxidation film is high in hydrophobicity; furthermore, no corrosion phenomenon occurs in a test of simulating seawater immersion corrosion resistance, sothat the multihole oxidation film is extremely high in corrosion resistance. According to the method, by the adoption of one-step heating and cooling treatment, the preparation process is simple andenvironmentally friendly; a prepared aluminum oxide film is stable and free of falling, has a practical value, and is expected to be industrially applied; the aluminum oxide film can be applied to a high-humidity and high-salinity ocean environment.

Description

technical field [0001] The invention relates to a corrosion-resistant oxide film, in particular to a method for preparing a low-wetting corrosion-resistant porous oxide film on an aluminum surface. Background technique [0002] Metals with low-wettability surfaces have attracted considerable attention for applications in the marine industry due to their low-friction properties in aqueous environments and good corrosion resistance. Organic coatings can reduce the surface wettability of metals and improve corrosion resistance, however, there are some disadvantages of organic coating technologies for hydrophobization of aluminum. For example, the cohesion between organic compounds and alumina is unstable, and the manufacturing process is complicated. Furthermore, there is an urgent need for a simple method for fabricating hydrophobic surfaces on aluminum that is environmentally friendly, improves durability, and does not have any organic coating. Contents of the invention ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/08C25D11/16
Inventor 郑萌杨黎晖蒋全通
Owner INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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