CN102409274A - Process for improving corrosion-resisting property of magnesium alloy - Google Patents
Process for improving corrosion-resisting property of magnesium alloy Download PDFInfo
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- CN102409274A CN102409274A CN201110398279XA CN201110398279A CN102409274A CN 102409274 A CN102409274 A CN 102409274A CN 201110398279X A CN201110398279X A CN 201110398279XA CN 201110398279 A CN201110398279 A CN 201110398279A CN 102409274 A CN102409274 A CN 102409274A
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Abstract
The invention discloses a process for improving the corrosion-resisting property of magnesium alloy by utilizing subzero treatment. The process comprises solution treatment, aging treatment and subzero treatment. Compared with the prior art, the invention adopts the magnesium alloy subzero treatment process to realize the purpose of improving the corrosion-resisting property of magnesium alloy base metal, and avoids the defects that the bonding force is poor, coating is damaged and the like when surface coating treatment is adopted.
Description
Technical field
The present invention relates to a kind of method of utilizing sub-zero treatment to improve corrosion stability of magnesium alloy, specifically, relates to a kind of cryogenic treatment process of magnesiumalloy modification, belongs to the material modification processing technology field.
Background technology
In industrial production, magnesiumalloy more and more receives people's attention because of the advantage of the uniqueness that it had, and the research of the various working methods of magnesiumalloy is also more and more received publicity.Magnesiumalloy is corroded under physical environment easily, influences function and outward appearance, causes this metal to be difficult to satisfy the needs of environment for use.At present solidity to corrosions that adopt surface treatment methods such as coated layer and anodizing to improve metal more.
Although adopt the coating method that metal is had the certain protection effect, because high-molecular coating easy ageing in physical environment, and not good with the bonding strength of matrix metal, particularly the easy contaminate environment of coating is unhealthful.Because the activity of magnesiumalloy self and surface are prone to characteristics such as oxidation, cause the plating process difficulty, furthermore in use damaged of coating even can bring more serious corrosion.The solidity to corrosion oxidation film layer that anonizing generates also can be used as barrier layer protected magnesiumalloy, but this rete porous, and just can not protect magnesiumalloy well after the clashing and breaking.
Very low temperature (being generally below-130 ℃) processing is claimed in sub-zero treatment again, is meant the object that is processed is placed specific, controlled subzero treatment environment, the heterogeneous microstructure of material is changed, thereby improve a kind of process method of material property.Sub-zero treatment has obtained using widely in the conventional steel iron material as the important process technology of improving material structure and performance.
Summary of the invention
The object of the invention aims to provide the corrosion proof cryogenic treating process of a kind of raising magnesiumalloy self, to overcome the existing defective of existing coated layer technology and to satisfy the demand in market.
The invention discloses a kind of cryogenic treatment process that improves corrosion stability of magnesium alloy, said technology comprises solution treatment, ageing treatment and sub-zero treatment process.Compared with prior art, the present invention has realized the corrosion proof purpose of raising magnesiumalloy base metal through the magnesiumalloy cryogenic treatment process, shortcomings such as the bad and coated layer breakage of the bonding force of having avoided surfaces coated coating to handle.
For realizing the foregoing invention purpose, the present invention adopts the cryogenic treatment process method to improve the solidity to corrosion of magnesiumalloy, and concrete steps are following:
(1) solution treatment
Nitrate salt heat temperature raising to 400～450 ℃ fusion places magnesiumalloy in the fused nitrate salt, and specimen surface is immersed in the fused salt fully, and insulation 1～18h takes out magnesiumalloy, places water to lower the temperature, and takes out dry;
Described nitrate salt can be selected saltpetre, SODIUMNITRATE for use;
(2) ageing treatment
Magnesiumalloy after the solution treatment is inserted in 200～300 ℃ of fused salts, and insulation 0.5-17h takes out cleaning-drying;
(3) sub-zero treatment
The magnesiumalloy that will pass through admittedly after molten and the ageing treatment places-180～-200 ℃ liquid gas, sub-zero treatment 1～72h; Liquid gas can be used liquid nitrogen or liquid argon.
Through the magnesiumalloy of above-mentioned art breading, solidity to corrosion is improved.
Compared with prior art, the present invention has realized the corrosion proof purpose of raising magnesiumalloy self through cryogenic treatment process, not good, the shortcomings such as clashing and breaking are broken, environmental pollution of the bonding force of having avoided surface treatment methods such as coated layer to bring.
Embodiment
Fig. 1 is the anodic polarization curves of magnesiumalloy.
Embodiment
Below in conjunction with embodiment the present invention is done further in detail, intactly explains:
(1) solution treatment: the ceramic crucible that saltpetre will be housed is put into box heat treatment furnace, is warming up to 415 ℃ with stove and makes it fusion; (Mg 90～91wt%) samples are inserted in the crucible for Al 8.5wt%～9.5wt%, Zn 0.45wt%～0.9wt%, and specimen surface is immersed in the fused salt fully, are incubated 10b, take out sample and also insert in the water and lower the temperature, and take out drying for standby with the AZ91D magnesiumalloy;
(2) ageing treatment: sample after step (1) solution treatment is inserted in 220 ℃ of fused salt crucibles, insulation 7h, it is subsequent use to take out sample and cleaning-drying;
(3) sub-zero treatment: will pass through magnesium alloy sample after solid solution and the ageing treatment and insert in-196 ℃ the liquid nitrogen, and place 15h and carry out taking out sample after the sub-zero treatment.
(1) solution treatment: the ceramic crucible that saltpetre will be housed is put into box heat treatment furnace, is warming up to 415 ℃ with stove and makes it fusion; The AZ91D magnesium alloy sample is inserted in the crucible, specimen surface is immersed in the fused salt fully, insulation 10h takes out sample and inserts in the water taking-up drying for standby;
(2) ageing treatment: sample after step (1) solution treatment is inserted in 220 ℃ of fused salt crucibles, insulation 7h, it is subsequent use to take out sample and cleaning-drying;
(3) sub-zero treatment: will pass through magnesium alloy sample after solid solution and the ageing treatment and insert in-196 ℃ the liquid nitrogen, and place 72h and carry out taking out sample after the sub-zero treatment.
Reference substance only passes through step (1) and (2) of embodiment 1 and handles, and does not carry out sub-zero treatment.Adopt the electrochemistry comprehensive tester that magnesiumalloy and embodiment 1,2 without sub-zero treatment are analyzed through the corrosion stability of magnesium alloy after the sub-zero treatment, the result is as shown in Figure 1.Anodic polarization curves by Fig. 1 can be known, compares with the polarization curve of magnesiumalloy before the sub-zero treatment, and through the corrosion potential increase of embodiment 1 and 2 magnesiumalloy after the different sub-zero treatment time of 15h and 72h, corrosion electric current density reduces.Along with the prolongation of deep cooling time, the corrosion potential of anodic polarization curves rises gradually, and corrosion electric current density reduces, and is visible, and the erosion resistance of magnesiumalloy is also strengthened thereupon.
Embodiment 3
(1) solution treatment: the ceramic crucible that saltpetre will be housed is put into box heat treatment furnace, is warming up to 430 ℃ with stove and makes it fusion; The AZ91D magnesium alloy sample is inserted in the crucible, specimen surface is immersed in the fused salt fully, insulation 15h, the taking-up sample is also inserted in the water and is lowered the temperature, and takes out drying for standby;
(2) ageing treatment: sample after step (1) solution treatment is inserted in 260 ℃ of fused salt crucibles, insulation 5h, it is subsequent use to take out sample and cleaning-drying;
(3) sub-zero treatment: will pass through magnesium alloy sample after solid solution and the ageing treatment and insert in-190 ℃ the liquid nitrogen, and place 2h and carry out taking out sample after the sub-zero treatment.
With compare without the magnesiumalloy of step (3) sub-zero treatment, the magnesiumalloy after the sub-zero treatment, corrosion potential increase, under the identical corrosion potential condition, corrosion electric current density reduces, and explains that the solidity to corrosion of magnesiumalloy has raising.
Claims (4)
1. a technology that improves corrosion stability of magnesium alloy is characterized in that, comprises the steps:
(1) solution treatment: magnesiumalloy is placed 400～450 ℃ of fused nitrate salt, Mg alloy surface will be immersed in the fused salt fully, insulation 1～18h takes out magnesiumalloy and uses water for cooling, drying for standby;
(2) ageing treatment: the magnesiumalloy after the solution treatment is immersed in 200～300 ℃ of fused salts cleaning-drying behind insulation 0.5～17h;
(3) sub-zero treatment: the magnesiumalloy that will pass through after solution treatment and the ageing treatment is placed 1～72h in-180～-200 ℃ liquid gas.
2. the said a kind of technology that improves corrosion stability of magnesium alloy of claim 1 is characterized in that the nitrate salt described in the step (1) is selected from SODIUMNITRATE or saltpetre.
3. the said a kind of technology that improves corrosion stability of magnesium alloy of claim 1 is characterized in that the liquid gas described in the step (2) is liquid nitrogen or liquid argon.
4. the technology of each said raising corrosion stability of magnesium alloy of claim 1～3 is characterized in that, contained magnesium elements mass percent is 60%～98% in the said magnesiumalloy, also contains at least a in aluminium, zinc and the manganese element.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103276327A (en) * | 2013-04-28 | 2013-09-04 | 南昌大学 | Method for deep cooling extruded magnesium-zinc magnesium alloy |
| CN103510028A (en) * | 2013-09-29 | 2014-01-15 | 常州市润源经编机械有限公司 | Method for carrying out enhancement processing on intensity and toughness of light alloy material |
| CN103525995A (en) * | 2013-10-30 | 2014-01-22 | 常州市润源经编运用工程技术研究中心有限公司 | Treatment method for improving alloy material strength, toughness, and anti-fatigue life |
| CN107574392A (en) * | 2017-08-31 | 2018-01-12 | 中国科学院海洋研究所 | A kind of processing method of raising Mg Y Nd based alloy decay resistances |
| CN109837437A (en) * | 2019-02-27 | 2019-06-04 | 吉林大学 | A kind of alternating temperature controlled rolling preparation method for making low content magnesium alloy that there is uniform fine grain |
| CN112391600A (en) * | 2021-01-21 | 2021-02-23 | 中南大学湘雅医院 | Corrosion-resistant medical magnesium alloy surface hydroxyapatite coating and preparation method thereof |
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| US20100018615A1 (en) * | 2008-07-28 | 2010-01-28 | Ati Properties, Inc. | Thermal mechanical treatment of ferrous alloys, and related alloys and articles |
| CN102154598A (en) * | 2011-03-08 | 2011-08-17 | 太原科技大学 | Method for increasing seawater corrosion resistance performance of MB5 magnesium alloy argon arc welding joint |
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Patent Citations (2)
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| US20100018615A1 (en) * | 2008-07-28 | 2010-01-28 | Ati Properties, Inc. | Thermal mechanical treatment of ferrous alloys, and related alloys and articles |
| CN102154598A (en) * | 2011-03-08 | 2011-08-17 | 太原科技大学 | Method for increasing seawater corrosion resistance performance of MB5 magnesium alloy argon arc welding joint |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103276327A (en) * | 2013-04-28 | 2013-09-04 | 南昌大学 | Method for deep cooling extruded magnesium-zinc magnesium alloy |
| CN103510028A (en) * | 2013-09-29 | 2014-01-15 | 常州市润源经编机械有限公司 | Method for carrying out enhancement processing on intensity and toughness of light alloy material |
| CN103510028B (en) * | 2013-09-29 | 2015-09-09 | 常州市润源经编机械有限公司 | The enhancement process method of light alloy material intensity and toughness |
| CN103525995A (en) * | 2013-10-30 | 2014-01-22 | 常州市润源经编运用工程技术研究中心有限公司 | Treatment method for improving alloy material strength, toughness, and anti-fatigue life |
| CN103525995B (en) * | 2013-10-30 | 2016-01-20 | 常州市润源经编运用工程技术研究中心有限公司 | A kind for the treatment of process improving alloy material obdurability and anti-fatigue life |
| CN107574392A (en) * | 2017-08-31 | 2018-01-12 | 中国科学院海洋研究所 | A kind of processing method of raising Mg Y Nd based alloy decay resistances |
| CN109837437A (en) * | 2019-02-27 | 2019-06-04 | 吉林大学 | A kind of alternating temperature controlled rolling preparation method for making low content magnesium alloy that there is uniform fine grain |
| CN112391600A (en) * | 2021-01-21 | 2021-02-23 | 中南大学湘雅医院 | Corrosion-resistant medical magnesium alloy surface hydroxyapatite coating and preparation method thereof |
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Application publication date: 20120411 |