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Magnesium alloy anodizing solution, preparing method and anodizing method for magnesium alloy

An anodic oxidation and magnesium alloy technology, which is applied in the field of metal surface treatment, can solve the problems of easy peeling of the film layer, uneven pores of the oxide film, uneven coloring, etc., and achieve the effect of not easy to fall off, uniform dyeing effect, and improved uniformity

Active Publication Date: 2017-10-24
BYD CO LTD
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Problems solved by technology

Due to the characteristics of magnesium itself, the industrialization and production are far behind aluminum alloy anodic oxidation, the formed oxide film has uneven pores, and the film layer is easy to fall off under pressure conditions; especially when the magnesium alloy is colored, there will be uneven coloring, The problem of poor adhesion of the dyed layer

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  • Magnesium alloy anodizing solution, preparing method and anodizing method for magnesium alloy

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preparation example Construction

[0016] The present invention also provides the preparation method of above-mentioned anodic oxidation solution, comprises adding hydroxide, silicate, metaaluminate, phosphate, glyoxylic acid and ethylene glycol into water, and stirring until dissolving. Preferably, hydroxide, metaaluminate, silicate and phosphate, ethylene glycol and glyoxylic acid are sequentially added into water to dissolve and stirred evenly.

[0017] The invention also provides a method for anodizing the surface of the magnesium alloy. The magnesium alloy is immersed in the above magnesium alloy anodizing solution for anodizing. Preferably, the temperature of the magnesium alloy anodic oxidation solution is 30-40° C., the anodic oxidation current is 3-7A, and the anodic oxidation time is 5-30 min.

[0018] Preferably, the magnesium alloy can be pretreated before anodizing; pretreatment is a commonly used pretreatment method in the field, specifically mechanical removal of oxide layer, ash removal, oil rem...

Embodiment

[0021] Example 1-5

[0022] 1. Preparation of magnesium alloy anodizing solution: Add hydroxide, silicate, metaaluminate, phosphate, ethylene glycol and glyoxylic acid into deionized water. The magnesium alloy anodic oxidation solution A1-A5 was obtained according to the component distribution ratio in Table 1, and the specific dosage of each component is shown in Table 1.

[0023] 2. Pre-treat a 5cm×3cm magnesium alloy sample (brand AZ91D) to remove the oxide layer, remove ash and oil, and wash with water; put the above-mentioned pretreated magnesium alloy sample into the magnesium alloy anodic oxidation in step (1) In the solution, oxidize for 10 minutes at a solution temperature of 35°C and a current of 5A; take out the oxidized magnesium alloy, wash it with water, and dry it to obtain experimental samples Y1-Y5.

[0024] Table 1:

[0025]

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Abstract

The invention relates to a magnesium alloy anodizing solution. The anodizing solution is an aqueous solution containing hydroxide, silicate, meta-aluminate, phosphate, ethylene glycol and glyoxylic acid. The invention further provides a preparing method for the magnesium alloy anodizing solution and an anodizing method for the magnesium alloy with the adoption of the magnesium alloy anodizing solution. According to the provided magnesium alloy anodizing solution, sizes of pores in an oxidation film can be effectively reduced, uniformity of the pores is improved, and the dyeing effect of the rear section is improved accordingly.

Description

technical field [0001] The invention relates to metal surface treatment, in particular to a magnesium alloy surface anodic oxidation solution, a preparation method thereof and a magnesium alloy anodic oxidation method. Background technique [0002] Magnesium alloys have been widely concerned because of their unique properties and abundant resources. However, due to the immature processing technology of magnesium alloys, the problem of poor corrosion resistance has become the main obstacle to exerting its superior performance, thus limiting the development of magnesium alloys to a large extent. promotion and application on a larger scale. Since the 1940s and 1950s, foreign countries have carried out research and development on the surface treatment technology of magnesium alloys. [0003] Magnesium alloy surface coloring is one of the current research hotspots, and anodic oxidation plus dyeing is a relatively popular research process. At present, the aluminum alloy adopts c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/30
CPCC25D11/30
Inventor 韦家亮
Owner BYD CO LTD
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