Magnesium alloy surface hydrophobization compound processing method

Abstract

The invention discloses a magnesium alloy surface hydrophobization compound processing method combining micro-arc oxidation with an organic film coating technology and comprising the following steps: preparing a micro-nano porous super-hydrophilic surface by the micro-arc oxidation; and carrying out hydrophobization processing of an organic coating film. The invention prepares a micro-nano porouscompound structural film with hydrophobic and super-hydrophobic functions and excellent corrosion resistance; according to actual demand, a static contact angle of the compound structural film and distilled water is controllable within the range from 110 to174 degrees and the thickness of the compound structural film is controllable within the range from 2 to 30 micrometers, the electrokinetic potential polar characteristic, the electrical potential shuffle the corrosion current density of the compound structural film in a 3.5% NaCl solution or 0.1m / LNaCl solution are all reduced by 3 magnitude orders. The invention is suitable for the corrosion, pollution and water prevention of a magnesium alloy workpiece with large area and also suitable for the shell of a light precise magnesium alloyproduct to widen the application field of magnesium alloys and has simple and convenient technology, short period, low cost and easy industrialized production.

Description

technical field [0001] The invention relates to the technical field of magnesium alloy surface modification, in particular to a composite treatment method for magnesium alloy surface hydrophobization by combining micro-arc oxidation and organic coating technology. Background technique [0002] Wettability is an important characteristic of the surface of a material, and hydrophilicity and hydrophobicity are two aspects that characterize the wettability of a material surface, and are important parameters that directly reflect the surface free energy of a material. The change of surface wettability (hydrophilicity and hydrophobicity) of materials can improve the surface properties of materials and expand the application range of materials, which plays an important role in industrial and agricultural production and people's daily life. By achieving hydrophilic-hydrophobic conversion on the surface of magnesium alloys, the preparation of functional films with hydrophobic or super...

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Problems solved by technology

For example, the Chinese invention patent application number is 200710078089.3, which discloses a method for preparing a superhydrophobic surface of a magnesium alloy. It undergoes micro-arc oxidation treatment to obtain a rough surface, then treats it in acrylic acid, and finally spin-coats vinyl polydimethylsiloxane The surface modification of alkane makes the contact angle greater than 150°. Since the micro-arc oxidation must undergo chemical corrosion follow-up treatment, the process is more complicated, and because the super-hydrophobic surface obtained by the spin coating process relies on physical adsorption or van der Waals force combination. , the lifetime of superhydrophobic surfaces is limited

The Chinese invention patent application number is 200710156490.4, which discloses a method for preparing a light metal super-hydrophobic surface. It adopts anodic oxidation, then undergoes low-temperature plasma treatment, and finally obtains a super-hydrophobic surface by immersion chemical modification. After micro-arc oxidation, it must undergo Plasma treatment, the follow-up process is also relatively complicated, and because the pre-treatment of this method is anodic oxidation, its corrosion resistance is not ideal compared with micro-arc oxidation as the pre-treatment. In addition, the prepared super-hydrophobic surface is still a physical combination. , the service life of superhydrophobic surfaces is also limited

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