Surface treatment method for magnesium alloy

A surface treatment, magnesium alloy technology, applied in the field of metal surface treatment, can solve the problem that the wear resistance of the magnesium alloy conversion film layer has not been greatly improved, this layer of oxide film is easily corroded by strong acid and strong alkali, and the magnesium alloy crystal Inter-corrosion and other problems can be achieved to shorten the preparation time, improve the convenience and effect, and enhance the quality

CN105908242AInactive Publication Date: 2016-08-31刘洪建
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2016-08-31
Estimated Expiration
Not applicable · inactive patent
Patent Text Reader

Abstract

The invention discloses a surface treatment method for magnesium alloy. The method includes the following steps of (1) primary washing, (2) ungrease treatment, (3) secondary washing, (4) primary acid pickling, (5) secondary acid pickling, (6) alkali washing, (7) anodic oxidation, (8) third-time washing and (9) drying and heat preservation. All the steps of the processing method are scientific, reasonable and ingenious in process. The structure of surface oxidation films of a magnesium alloy material is effectively improved, the strong acid resistance, strong base resistance and organic solvent corrosion resistance are improved obviously, the surface strength is improved by 30%-35%, and the brittleness is well improved. A special cellular structure is achieved, the deep processing technique like dyeing is facilitated, and the use value is good.
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Description

technical field

[0001] The invention belongs to the technical field of metal surface treatment, and in particular relates to a surface treatment method of a magnesium alloy. Background technique

[0002] Magnesium alloy is an alloy composed of magnesium and other elements. It has low density, high specific strength, large specific elastic modulus, good heat dissipation, good shock absorption, and greater impact load capacity than aluminum alloy. Mainly used in aviation, aerospace, transportation, chemical industry, rocket and other industrial sectors.

[0003] There are many methods for surface treatment of magnesium alloys. At present, physical methods, chemical methods, physical chemical methods and comprehensive methods are relatively mature and widely used. The commonly used method is the anodic oxidation method, which forms a conversion film on the surface of the magnesium alloy by an electrochemical method. Although this method can improve the corrosion resistance of...

Examples

Embodiment Construction

[0022] A surface treatment method for a magnesium alloy, comprising the steps of:

[0023] (1) One-time water washing: wash the magnesium alloy material with clean water to remove impurities and dust;

[0024] (2) Degreasing treatment: put the magnesium alloy material into the degreasing liquid, heat to keep the temperature of the degreasing liquid at 38-40°C, and complete the degreasing treatment after 20-25 minutes; the degreasing liquid consists of the following substances by weight: 5 parts Sodium nitrilotriacetate, 4 parts of sodium silicate, 3 parts of alkylphenol polyoxyethylene ether, 15 parts of sodium tripolyphosphate, 3 parts of fatty alcohol polyoxyethylene ether, 300 parts of water;

[0025] (3) Secondary water washing: wash the degreased magnesium alloy material with clean water, and dry it for later use;

[0026] (4) Primary pickling: Put the magnesium alloy material treated in step (3) into the primary pickling solution, heat to keep the solution temperature a...