CN1986841A - Method of raising corrosion resistance of magnesium alloy based on reiforcing laser impact technology - Google Patents
Method of raising corrosion resistance of magnesium alloy based on reiforcing laser impact technology Download PDFInfo
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- CN1986841A CN1986841A CN 200610097397 CN200610097397A CN1986841A CN 1986841 A CN1986841 A CN 1986841A CN 200610097397 CN200610097397 CN 200610097397 CN 200610097397 A CN200610097397 A CN 200610097397A CN 1986841 A CN1986841 A CN 1986841A
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Abstract
The present invention is new laser impact strengthening technology to raise the corrosion resistance of magnesium alloy. After magnesium alloy surface is coated with energy absorbing layer and restraint layer of water, glass or other laser transparent material, ns level short laser pulse with high power density of GW/sq cm level is adopted to impact on the surface of the workpiece in the laser spot area landing amount over 73 %. Meanwhile, the energy absorbing layer absorbs the energy of laser beam to form high temperature and high pressure plasma instantaneously and to produce shock wave of the strength reaching GPa level and greatly higher than the yield strength of the alloy material, and one plastic deformation layer with residual stress and high density dislocations is produced in the alloy surface to raise the anticorrosive performance obviously and to protect the surface of the workpiece against hot injury of laser beam.
Description
Technical field
The present invention relates to material surface modifying and reiforcing laser impact technology field, refer in particular to a kind of laser impact intensified treatment technology and the method that improves the Mg alloy surface resistance to corrosion.
Background technology
Magnesium alloy is one of the lightest structural metallic materials of present industrial application, and density only is 1.3 * 10
3～1.9 * 10
3Kg/m
3Not etc., be about 2/3 of aluminium, 1/4 of iron, this characteristic makes it become first-selected substitute products in aerospace, automotive industry and the telecommunications industry just, to realize the purpose of loss of weight.Magnesium alloy also has high specific tenacity, specific rigidity and good casting, welding, damping shock absorption, machining and dimensional stability etc., it is abundant to add magnesium resource, characteristics such as the recyclable utilization again of magnesium-alloy material, make magnesium alloy be expected to obtain long-range development, expectation will become important commercial light material of 21 century.But magnesium has potential minimum in all structural metals; In addition, the oxide film of magnesium is loose, and densification unlike pellumina and protectiveness is arranged is so the corrosion resisting property of magnesium alloy is relatively poor.Magnesium alloy is as existing very big gap between the potentiality of structural material applications and the reality, and this and corrosion stability of magnesium alloy have direct relation, and the solidity to corrosion of difference has become the bottleneck of restriction magnesium alloy potential performance.Strengthen the research of corrosion stability of magnesium alloy, try to explore to strengthen the approach of corrosion stability of magnesium alloy, for promoting magnesium alloy as the application of structural part and give full play to its performance advantage and have great significance.
The method that improves the corrosion stability of magnesium alloy energy at present mainly contains: (1) improves the purity of magnesium alloy, and the content that endangers its corrosion proof impurity element in the magnesium alloy is dropped to below the threshold value; (2) in magnesium alloy, add new element, improve the corrosion resisting property of magnesium alloy with the microtexture of improving magnesium alloy; (3) adopt quick setting method, make magnesium alloy quite fast to the speed of cooling of solid phase (greater than 10 by liquid phase
5K/s), improve the corrosion resisting property of magnesium alloy with the microtexture of improving magnesium alloy; (4) adopt process for treating surface to improve its solidity to corrosion, mainly comprise the chemical conversion processing, anodic oxidation treatment, metal plating, laser surface modification, organic coating etc.
The laser surface modification technology has little to the matrix heat affecting and advantage that easily be automated, at present in the domestic and foreign literature that can consult, the patent, the laser surface modification technology of appearing in the newspapers mainly is a heat effect of having utilized laser, and employing does not appear in the newspapers based on the method for the laser impact intensified treatment technology raising Mg alloy surface erosion resistance of stress effect.As U.S. Pat 4613386, " Method of making corrosion resistantmagnesium and aluminum oxyalloys ", this method at first is no more than alloying elements such as the thick aluminium of 1.5mm, silicon, titanium, manganese, zirconium at Mg alloy surface deposition one deck, under aerobic environment, use high energy pulse laser irradiation surface then, form the corrosion resistant alloy oxidation layer of one deck at Mg alloy surface.China patent CN1629352 " the laser surface intensified restorative procedure of magnesium alloy "; this method is used pulse laser or carbon dioxide laser; under atmospheric condition; use argon gas (or mixed gas of helium or argon gas, helium) to protect, defective such as loose, the pore of magnesium alloy, crackle, shrinkage cavity, corrosion pit and misrun, dimension overproof etc. are strengthened reparation.People such as Britain G.Abbas have studied the employing argon gas as shielding gas in document " Corrosion behavior of laser-melted magnesium alloys ", adopt the continuous CO of 1.5kW
2Laser irradiation magnesium alloy AZ31, AZ61 surface, spot diameter are 2mm, and sweep velocity is 160mm/s, and the amount of lap between the scanning road is 50%.This method adopts laser surface remelting technology, utilized laser thermal effect, Mg alloy surface is melted fast, under self thermal conduction of matrix, make surface cooling fast subsequently, the surface microscopic tissue improves, the immersion corrosion experiment shows that the erosion resistance of the Mg alloy surface behind laser remolten is improved significantly in 5% NaCl solution.
Summary of the invention
The purpose of this invention is to provide the new technology that a kind of reiforcing laser impact technology based on stress effect (LSP) improves the Mg alloy surface corrosion resistance.
Laser impact intensified (Laser Shock Processing or Laser Shock Peening) is called for short the LSP technology, is a kind of processing means with very good prospect, and its principle is high power density (GW/cm
2Level) short pulse (ns level) lasing is in material surface, and skin-material produces plasma body after absorbing laser energy, and the plasma jet blast forms the intensive shockwave.Coated with constraint medium and absorber coatings, the shock strength and the action time that have strengthened induced with laser greatly, shock strength reaches the GPa magnitude at material surface in the present invention, considerably beyond the dynamic yield strength of material, produces a plastic deformation layer at material surface.Exist residual compressive stress and high density dislocation in the plastic deformation layer, these factors are significantly improved the corrosion resistance nature of Mg alloy surface.
The present invention coats energy-absorbing coating with Mg alloy surface, adopts the water or the glass of laser-light transparent are done restraint layer, and adopting the power density of laser is GW/cm
2Magnitude, pulse width are nanosecond, laser-impact workpiece surface, area amount of lap＞72% between hot spot.Described energy-absorbing coating is the described flexible lamina of patent 02138338.3 " a kind of flexible lamina that is used for the laser-impact processing ".
Neutral salt spray corrosion (NSS) simultaneous test is carried out in zone and the untreated zone of Mg alloy surface after laser impact intensified processing, test temperature is 35 ℃ ± 1 ℃, the salt fog hydrojet is 5% the NaCl aqueous solution of chemical pure NaCl and distilled water configuration, pH=6.5～7.2, salt fog sinkability are 1～2ml/80cm
2H.Test-results shows, zone after laser impact intensified processing, the time that its corrosion pit begins to occur obviously is later than untreated areas, after salt mist experiment was sprayed 20 hours continuously, density, the size of the corrosion pit in laser impact intensified district are significantly less than untreated areas, the area of untreated areas corrosion pit accounts for 20%, and area less than 5% (see figure 2) of the corrosion pit in the zone after laser reinforcing is handled.
Advantage of the present invention is as follows:
(1) present method is coated with the black energy-absorbing coating at Mg alloy surface before laser-impact is handled, and has greatly improved the utilization ratio of laser energy.If with wavelength is the direct irradiation Mg alloy surface of Nd glass laser of 1054nm, Mg alloy surface is about 4% to the specific absorption of laser, cause the waste of laser energy greatly, and surperficial absorber coatings can absorb laser energy substantially fully, after top coat fully absorbs laser energy, can produce more multiple plasma, in material, bring out the laser blast wave that pressure is bigger, the time length is longer, simultaneously top coat can effectively prevent Mg alloy surface fusing and vaporization, the vestige of not burning of the surface after the laser impact intensified processing.
(2) present method adopts water or glass to do restraint layer when laser-impact, not only plays the effect that increases the stress waves in soils peak pressure, is twice but also the halfwidth degree of stress waves in soils is increased.Adopt restraint layer when laser impact intensified, can make coating absorb the plasma body that produces outside splash behind the laser energy and suffer restraints, hinder the expansion of plasma body, thereby produce higher shock wave pressure.
(3) the high-amplitude shockwave of laser-impact generation, shock strength is up to the Gpa magnitude, shock strength is considerably beyond the dynamic yield strength of material, cause a plastic deformation layer at material surface, exist surface compress residual stresses and high density dislocation in the ductile bed, material surface hardness also is significantly increased, and this has not only improved the corrosion resistance nature of magnesium alloy, has also improved the surperficial wear resistance and the anti-fatigue performance of material.
(4) present method does not have thermal damage to magnesium alloy substrate; because laser pulse is short; had only for tens nanoseconds; laser and metallic surface are short action time; and most of laser energy is absorbed coating and absorbs; because the protection of the thermal boundary of absorption layer, therefore the heat that passes to the metallic surface seldom can not cause the thermal damage of matrix.
(5) present method can be handled the workpiece corner, because the laser facula adjustable size, and can accurately control and locate, so can handle to the position that some traditional technologys can not be handled.
Description of drawings
Fig. 1: structural representation of the present invention
Fig. 2: the surperficial macro morphology figure of sample after continuous salt air corrosion in 20 hours after laser-impact is handled
Fig. 3: treatment zone can both be subjected to the hot spot overlap joint figure of laser irradiation
1. the zone after laser generator Controlling System 2. pulse laser generators 3. condenser lenses 4. restraint layers 5. absorber coatings 6. workpiece 7. numerical control table, NC tables 8. numerical control table, NC table Controlling System 9. laser-impacts are handled is through pattern 11. laser faculas of 10. untreated areas of the pattern after the salt air corrosion after salt air corrosion
Embodiment
The constructional device synoptic diagram of laser-impact magnesium alloy is seen Fig. 1.Workpiece surface is evenly coated the thick pitch-dark absorber coatings of about 100 μ m, after having done etc. coating, workpiece is fixed on the numerical control table, NC table, the motion of worktable is controlled by workstation control system.Laser apparatus adopts the Nd amorphous laser, wavelength 1054nm, and pulse width 20ns, beam diameter 1～20mm is adjustable, and pulsed laser energy 1～50J/Pluse is adjustable, adjusts laser parameter by the laser apparatus Controlling System, and laser power density is controlled at GW/cm
2Magnitude.When laser-impact is handled, adopt water to do restraint layer, when workpiece surface is carried out the processing of big area shock peening, area amount of lap between each hot spot should be controlled at more than 73%, because used laser facula is circular, make the entire treatment district all be subjected to laser irradiation, certain amount of lap (see figure 3) then should be arranged between hot spot, and Theoretical Calculation shows that its overlapping area should be more than 73%, consider that laser energy is accurate Gaussian distribution, the spot center energy density is bigger, and hot spot edge laser energy density is less, and experiment shows, area amount of lap between each hot spot is controlled at about 80%, and the corrosion resistance nature of the magnesium alloy after laser-impact is handled is significantly improved.
Present embodiment adopts pitch-dark as absorber coatings, and pitch-dark cost is low, effective, and handles the back at laser-impact and remove easily.
Present embodiment adopts water as restraint layer, and water is that the Nd glass laser of 1054nm is transparent to wavelength, in addition, adopts water to do restraint layer, is convenient to apply in industry.
Claims (3)
1, improve the method for corrosion resistance of magnesium alloy based on reiforcing laser impact technology, it is characterized in that: Mg alloy surface is coated energy-absorbing coating, adopt water or glass to do restraint layer, adopting the power density of laser is GW/cm
2Magnitude, pulse width are nanosecond, laser-impact workpiece surface, area amount of lap＞72% between hot spot.
2, the method based on reiforcing laser impact technology raising corrosion resistance of magnesium alloy according to claim 1 is characterized in that described energy-absorbing coating is the described flexible lamina of patent 02138338.3 " a kind of flexible lamina that is used for the laser-impact processing ".
3, the method based on reiforcing laser impact technology raising corrosion resistance of magnesium alloy according to claim 1 is characterized in that the area amount of lap between each hot spot is about 80%.
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103526145A (en) * | 2013-10-11 | 2014-01-22 | 江苏大学 | High-quality laser modification life-prolonging method based on laser pulse width modulation |
| CN105097381A (en) * | 2014-05-06 | 2015-11-25 | 中国科学院沈阳自动化研究所 | Laser shock life-prolonging method of tungsten electrode of short-arc lamp |
| CN106148644A (en) * | 2016-08-24 | 2016-11-23 | 北京航空航天大学 | A kind of metallic hardfacing method of short-pulse laser |
| CN106435424A (en) * | 2016-09-22 | 2017-02-22 | 天津东义镁制品股份有限公司 | Laser shocking method of changing whole performance of AZ31B magnesium alloy |
| CN107164711A (en) * | 2017-04-14 | 2017-09-15 | 北京航空航天大学 | A kind of method that short-pulse laser improves Mg alloy surface corrosion resistance |
| CN107385193A (en) * | 2017-07-05 | 2017-11-24 | 温州大学激光与光电智能制造研究院 | A kind of combination treatment method for improving the hardware corrosive nature of moderate resistance containing solutions of chlorine |
| WO2018120359A1 (en) * | 2016-12-30 | 2018-07-05 | 宁波大艾激光科技有限公司 | Method and device for follow-up-type laser shock peening treatment |
| CN109207910A (en) * | 2018-10-25 | 2019-01-15 | 广东工业大学 | A kind of method for carburizing based on laser-impact |
| CN109750242A (en) * | 2019-02-19 | 2019-05-14 | 江苏大学 | The method that laser impact intensified combination magnetron sputtering promotes Magnesium Anti-Corrosion |
| CN109811285A (en) * | 2019-01-21 | 2019-05-28 | 西安交通大学 | A method of improving Mg-10Li-3Al-3Zn magnesium lithium alloy corrosion resistance of surface |
| RU2691154C1 (en) * | 2018-11-08 | 2019-06-11 | Федеральное государственное автономное образовательное учреждение высшего образования "Белгородский государственный национальный исследовательский университет" (НИУ "БелГУ") | Method of forming a corrosion-resistant layer on the surface of magnesium deformable alloys |
| CN110408769A (en) * | 2019-07-02 | 2019-11-05 | 江苏大学 | The device and method that femtosecond laser impact improves corrosion resistance of magnesium alloy |
| CN111270180A (en) * | 2020-02-28 | 2020-06-12 | 江苏大学 | Device and method for improving corrosion resistance of magnesium alloy through laser shock and phosphating treatment |
| CN114410955A (en) * | 2022-01-23 | 2022-04-29 | 南昌航空大学 | Method for improving cavitation erosion resistance of material by using laser shock peening technology |
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2006
- 2006-11-03 CN CN 200610097397 patent/CN1986841A/en active Pending
Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103526145A (en) * | 2013-10-11 | 2014-01-22 | 江苏大学 | High-quality laser modification life-prolonging method based on laser pulse width modulation |
| CN103526145B (en) * | 2013-10-11 | 2015-09-30 | 江苏大学 | The laser modified life-prolonging method of a kind of high quality based on laser pulse width modulation |
| CN105097381A (en) * | 2014-05-06 | 2015-11-25 | 中国科学院沈阳自动化研究所 | Laser shock life-prolonging method of tungsten electrode of short-arc lamp |
| CN105097381B (en) * | 2014-05-06 | 2017-04-12 | 中国科学院沈阳自动化研究所 | Laser shock life-prolonging method of tungsten electrode of short-arc lamp |
| CN106148644A (en) * | 2016-08-24 | 2016-11-23 | 北京航空航天大学 | A kind of metallic hardfacing method of short-pulse laser |
| CN106435424A (en) * | 2016-09-22 | 2017-02-22 | 天津东义镁制品股份有限公司 | Laser shocking method of changing whole performance of AZ31B magnesium alloy |
| CN108262563B (en) * | 2016-12-30 | 2023-10-24 | 宁波大艾激光科技有限公司 | Follow-up laser shock peening device and method |
| WO2018120359A1 (en) * | 2016-12-30 | 2018-07-05 | 宁波大艾激光科技有限公司 | Method and device for follow-up-type laser shock peening treatment |
| CN108262563A (en) * | 2016-12-30 | 2018-07-10 | 宁波大艾激光科技有限公司 | A kind of laser impact intensified processing unit of trailing type and method |
| CN107164711A (en) * | 2017-04-14 | 2017-09-15 | 北京航空航天大学 | A kind of method that short-pulse laser improves Mg alloy surface corrosion resistance |
| WO2019006901A1 (en) * | 2017-07-05 | 2019-01-10 | 温州大学激光与光电智能制造研究院 | Combined treatment method for improving corrosion resistance of metal component in chlorine-containing solution |
| CN107385193B (en) * | 2017-07-05 | 2019-03-01 | 温州大学激光与光电智能制造研究院 | A kind of raising combination treatment method of the metal component containing corrosion resistance in solutions of chlorine |
| CN107385193A (en) * | 2017-07-05 | 2017-11-24 | 温州大学激光与光电智能制造研究院 | A kind of combination treatment method for improving the hardware corrosive nature of moderate resistance containing solutions of chlorine |
| CN109207910A (en) * | 2018-10-25 | 2019-01-15 | 广东工业大学 | A kind of method for carburizing based on laser-impact |
| RU2691154C1 (en) * | 2018-11-08 | 2019-06-11 | Федеральное государственное автономное образовательное учреждение высшего образования "Белгородский государственный национальный исследовательский университет" (НИУ "БелГУ") | Method of forming a corrosion-resistant layer on the surface of magnesium deformable alloys |
| CN109811285A (en) * | 2019-01-21 | 2019-05-28 | 西安交通大学 | A method of improving Mg-10Li-3Al-3Zn magnesium lithium alloy corrosion resistance of surface |
| CN109750242A (en) * | 2019-02-19 | 2019-05-14 | 江苏大学 | The method that laser impact intensified combination magnetron sputtering promotes Magnesium Anti-Corrosion |
| CN110408769A (en) * | 2019-07-02 | 2019-11-05 | 江苏大学 | The device and method that femtosecond laser impact improves corrosion resistance of magnesium alloy |
| CN111270180A (en) * | 2020-02-28 | 2020-06-12 | 江苏大学 | Device and method for improving corrosion resistance of magnesium alloy through laser shock and phosphating treatment |
| CN111270180B (en) * | 2020-02-28 | 2021-10-12 | 江苏大学 | Device and method for improving corrosion resistance of magnesium alloy through laser shock and phosphating treatment |
| CN114410955A (en) * | 2022-01-23 | 2022-04-29 | 南昌航空大学 | Method for improving cavitation erosion resistance of material by using laser shock peening technology |
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