A kind of am50a die-casting magnesium alloy with excellent corrosion resistance oxide film and its preparation method

An AM50A, corrosion-resistant technology, applied in the field of magnesium alloy material preparation, can solve the problems of difficult handling, non-self-healing, weak bonding ability, etc., to achieve the effect of expanding application, slowing down corrosion rate, and improving corrosion resistance.

Active Publication Date: 2021-12-07
CHONGQING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Surface coating treatment is beneficial to improve the corrosion resistance of magnesium alloys, but the coating is generally thin (<1μm), has poor mechanical properties, weak binding ability with the body, and is easy to fall off. It can only be used to protect the metal for a short time and cannot be used For long-term protective coatings; chemical conversion coatings have good protective properties, among which chromate conversion coatings have the best anti-corrosion effect, but the existence of chromium compounds causes subsequent processing difficulties and environmental pollution problems, while chromium-free

Method used

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  • A kind of am50a die-casting magnesium alloy with excellent corrosion resistance oxide film and its preparation method
  • A kind of am50a die-casting magnesium alloy with excellent corrosion resistance oxide film and its preparation method
  • A kind of am50a die-casting magnesium alloy with excellent corrosion resistance oxide film and its preparation method

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Example Embodiment

[0030] Example 1

[0031] An AM50A die-casting magnesium alloy having excellent corrosion-resistant oxide film, and the preparation method thereof is as follows:

[0032] (1) A method of automatically spray release agent, the release agent (according to the weight percent, its composition is 11%, base oil (dimethyl silicone oil) 7%, synthesis / wax (paraffin) 4%, additive ( The fatty alcohol polyoxyethylene ether) 2%, the rest is ultrapure water) on the die-casting mold of the magnesium manganese alloy AM50A (the relevant parameters in the spraying process are: spraying time 2s, the spray distance is 200mm, spraying the mold The temperature was controlled at 220 ° C), and a high temperature oxide layer having a thickness of 1.4 μm was formed on the manganese magnesium alloy AM50A;

[0033] (2) The surface of the surface of the step (1) having a high temperature oxide layer is directly exposed to the air to perform the surface layer oxidation, forming an oxide film (2.5 μm) on the ...

Example Embodiment

[0034] Example 2

[0035] An AM50A die-casting magnesium alloy having excellent corrosion-resistant oxide film, and the preparation method thereof is as follows:

[0036] (1) A method of automatically spray release agent, a mold release agent (according to weight, it is comprised of 13%, base oil (polydimethylsiloxane liquid) 9%, synthesis / wax (stearic acid) 6%, additive (fatty alcohol polyoxyethylene ether) 4%, the rest is water) Make uniformly disperse spray coating on the die-casting mold of the magnesium manganese alloy AM50A (the relevant parameters in the spraying process are: spraying time 5s, the spray distance is 100 mm) After the spray coating, the mold temperature is controlled at 140 ° C), and a high temperature oxide layer having a thickness of 2.7 μm is formed on the manganese magnesium alloy AM50A;

[0037] (2) Directly exposes the magnesium oxide alloy AM50A having a high temperature oxide layer in step (1) to the air to perform the surface oxidation, forming an ...

Example Embodiment

[0038] Example 3

[0039] An AM50A die-casting magnesium alloy having excellent corrosion-resistant oxide film, and the preparation method thereof is as follows:

[0040] (1) A method of automatically spraying release agents (according to weight percentage, it is comprised of silicone oil 12%, base oil (dimethyl silicone oil) 8%, synthesis / wax (paraffin) 5%, additive ( The fatty alcohol polyoxyethylene ether) 3%, the rest is ultrapure water) A uniform dispersion spray coating on the die-cast mold of the magnesium manganese alloy AM50A (the relevant parameters in the spraying process are: spraying time is 150 mm, sprayed after spraying Temperature control at 200 ° C), a high temperature oxide layer having a thickness of 2.2 μm is formed on the manganese magnesium alloy AM50A;

[0041] (2) Put the magnesium manganese alloy AM50A having a high temperature oxide layer in step (1) to the air to perform the surface oxidation, forming an oxide film (3.5 μm) on the surface of the magnes...

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Abstract

The invention relates to an AM50A die-casting magnesium alloy with excellent corrosion resistance oxide film and a preparation method thereof, belonging to the technical field of magnesium alloy preparation. The present invention sprays a release agent with a certain thickness on the mold during high-temperature die-casting, so that it reacts with the alloy melt to generate a uniform corrosion-resistant oxide film on the surface of the magnesium-manganese alloy AM50A (the composition of the oxide film is Al: 1.97~5.21at.%, Si: 11.54~16.99at.%, C: 14.7~14.92at.%, Ca: 0.94~1.33at.%, O: 39.93~54.16at.%, Mn: 0.07~0.08at.% %, the rest is Mg), this oxide film can greatly improve the corrosion resistance of AM50A die-casting magnesium alloy, slow down the corrosion rate, and further expand its application in industry on a large scale.

Description

technical field [0001] The invention belongs to the technical field of magnesium alloy material preparation, and in particular relates to an AM50A die-casting magnesium alloy with an excellent corrosion-resistant oxide film and a preparation method thereof. Background technique [0002] As the lightest metal structural material, magnesium alloy is widely used in the fields of automobile and aerospace due to its high specific strength and specific stiffness, excellent damping, shock absorption, noise reduction and cutting performance. However, due to the relatively active chemical properties of magnesium alloys, it is easy to react with oxygen in the air to form a loose and porous oxide film, which cannot protect the magnesium substrate from continuous corrosion, making the corrosion resistance of the alloy, especially in humid environments Corrosion resistance is poor, which limits its wide application to some extent. [0003] In order to solve the problem of poor corrosion...

Claims

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Application Information

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IPC IPC(8): C22C23/00B22C3/00B22D17/00C23C8/10
CPCB22C3/00B22D17/00C22C23/00C23C8/10
Inventor 刘文君蒋斌杨华宝夏胜奇向宏陈宋江凤张昂游国强杨明波潘复生
Owner CHONGQING UNIV OF TECH
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