Corrosion-resistant magnesium alloy and method for improving corrosion resistance of corrosion-resistant magnesium alloy

A magnesium alloy and anti-corrosion technology, applied in the field of magnesium alloys, can solve the problems of potential threats to human health and the environment, weak bonding ability between the coating and the body, and inability to provide effective protection, and achieve fewer macro and micro defects, enhanced Corrosion resistance, compactness enhancement effect

Inactive Publication Date: 2014-10-08
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Magnesium alloys have excellent comprehensive properties and are widely used. However, due to the active chemical properties of magnesium alloys, their corrosion resistance in humid environments is poor, and the oxide film of ordinary magnesium alloys is generally loose and porous, which cannot provide effective protection.
[0003] In order to overcome the defects of poor corrosion resistance of magnesium alloys, anodic oxidation treatment, surface coating treatment and chemical conversion film treatment technology are usually used to coat a protective film on the surface of magnesium alloys to avoid oxidation of the magnesium alloy matrix: the anodic oxidation method can significantly Improving the corrosion resistance of magnesium alloys, and the obtained oxide film has a strong bonding ability with the magnesium alloy matrix, so it is widely used, but due to the large amount of electrolyte used in the treatment process, there is a potential threat to human health and the environment; surface coating treatment It can also improve the corrosion resistance of magnesium alloys, but the coating obtained by ordinary chemical conversion coating treatment technology has weak bonding ability with the body and is easy to fall off. However, the more mature chromate treatment technology, although the treated chromium-containing conversion coating has an anti-corrosion effect Better, but the chromate treatment process contains hexavalent chromium ions, which is highly toxic and its use is strictly restricted

Method used

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  • Corrosion-resistant magnesium alloy and method for improving corrosion resistance of corrosion-resistant magnesium alloy
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  • Corrosion-resistant magnesium alloy and method for improving corrosion resistance of corrosion-resistant magnesium alloy

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Experimental program
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Effect test

Embodiment 1

[0027] The method for preparing the novel anti-corrosion magnesium alloy in this embodiment includes:

[0028] 1), drawing materials: take a certain amount of pure Mg, pure Sn and Mg-Y master alloy, wherein the mass percentage of Y in the Mg-Y master alloy is 30%;

[0029] 2), melting: in CO 2 and SF 6 Under the protection of the atmosphere, the pure magnesium is first heated to 700°C, then pure Sn and Mg-Y master alloy are added, and the magnesium alloy melt is obtained by fully stirring and melting;

[0030] 3), pouring: heat the magnesium alloy melt in step 2) at 720° C. for 10 minutes, remove impurities, pour it into a steel mold with a diameter of 80 mm, and cast it to obtain an ingot;

[0031] 4), air cooling the ingot obtained in step 3).

[0032] After testing, the chemical composition and ratio of the magnesium alloy obtained in this example are as follows: Y: 1.5%, Sn: 0.25%, total amount of impurities: 0.03%, of which Fe: 0.002%, Cu: 0.001%, Si: 0.001%, The rest...

Embodiment 2

[0034] The method for preparing the novel anti-corrosion magnesium alloy in this embodiment includes:

[0035] 1), drawing materials: take a certain amount of pure Mg, pure Sn and Mg-Y master alloy, wherein the mass percentage of Y in the Mg-Y master alloy is 30%;

[0036] 2), melting: in CO 2 and SF 6 Under the protection of the atmosphere, the pure magnesium is first heated to 700°C, then pure Sn and Mg-Y master alloy are added, and the magnesium alloy melt is obtained by fully stirring and melting;

[0037] 3), pouring: heat the magnesium alloy melt in step 2) at 720° C. for 10 minutes, remove impurities, pour it into a steel mold with a diameter of 80 mm, and cast it to obtain an ingot;

[0038] 4), the ingot obtained in air cooling step 3); (after testing, the chemical composition and proportion of the ingot are as follows: Y: 1.4%, Sn: 0.9%, total amount of impurities: 0.03%, wherein Fe: 0.001%, Cu: 0.00:1%, Si: 0.001%, the rest is magnesium)

[0039] 5) The magnesiu...

Embodiment 3

[0041] The method for preparing the novel anti-corrosion magnesium alloy in this embodiment includes:

[0042] 1), drawing materials: take a certain amount of pure Mg, pure Sn and Mg-Y master alloy, wherein the mass percentage of Y in the Mg-Y master alloy is 30%;

[0043] 2), melting: in CO 2 and SF 6 Under the protection of the atmosphere, the pure magnesium is first heated to 700°C, then pure Sn and Mg-Y master alloy are added, and the magnesium alloy melt is obtained by fully stirring and melting;

[0044] 3), pouring: heat the magnesium alloy melt in step 2) at 720° C. for 10 minutes, remove impurities, pour it into a steel mold with a diameter of 80 mm, and cast it to obtain an ingot;

[0045] 4), the ingot obtained in air cooling step 3); (after testing, the chemical composition and proportion of the ingot are as follows: Y: 1.6%, Sn: 0.7%, total amount of impurities: 0.02%, wherein Fe: 0.001%, Cu: 0.001%, Si: 0.001%, the rest is magnesium)

[0046] 5), heating the ...

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Abstract

The invention discloses a corrosion-resistant magnesium alloy which is prepared from the following components by mass percent: 0.8% to 2.8% of Y, 0.2% to 1.6% of Sn, totally less than or equal to 0.03% of inevitable impurities and the balance of Mg, wherein in the inevitable impurities, the content of Fe is less than or equal to 0.002%, the content of Cu is less than or equal to 0.002% and the content of Si is less than or equal to 0.001%. The invention further discloses a method for improving the corrosion resistance of the corrosion-resistant magnesium alloy. The method comprises the following steps: firstly, heating the magnesium alloy material to 450 DEG C to 520 DEG C and oxidizing for 6 to 8 hours in a heat preservation manner; then, cooling the oxidized magnesium alloy with water of 70 DEG C to 80 DEG C. The magnesium alloy contains Y and Sn, so that an oxidation layer with the excellent corrosion resistance can be formed on the surface of the magnesium alloy after the magnesium alloy material is heated to 450 DEG C to 520 DEG C, is oxidized for 6 to 8 hours in the heat preservation manner and then is cooled with the warm water.

Description

technical field [0001] The invention belongs to the technical field of magnesium alloys, relates to a magnesium alloy with excellent corrosion resistance, and also relates to a method for improving the corrosion resistance of the magnesium alloy. Background technique [0002] Magnesium alloys have excellent comprehensive properties and are widely used. However, due to the active chemical properties of magnesium alloys, their corrosion resistance is poor in humid environments, and the oxide film of ordinary magnesium alloys is generally loose and porous, which cannot provide effective protection. [0003] In order to overcome the defects of poor corrosion resistance of magnesium alloys, anodic oxidation treatment, surface coating treatment and chemical conversion film treatment technology are usually used to coat a protective film on the surface of magnesium alloys to avoid oxidation of the magnesium alloy matrix: the anodic oxidation method can significantly Improving the co...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): C22C23/00C22C23/06C22F1/06
Inventor蒋斌郁笑雯潘复生杨青山李昕
OwnerCHONGQING UNIV