CN102181909A - Thin layer treatment method for surface of AZ91 magnesium alloy - Google Patents
Thin layer treatment method for surface of AZ91 magnesium alloy Download PDFInfo
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Abstract
The invention discloses a thin layer treatment method for the surface of AZ91 magnesium alloy and belongs to the field of research on thin-layer treatment of the surface of the AZ91 magnesium alloy. In the method, on the basis of an alternating-current (AC) plasma micro-arc oxidation treatment method, oxygen gas is sprayed into treating liquid so as to improve the reaction uniformity of the treating liquid and the magnesium alloy, and under the conditions that the concentration of potassium fluoride is 251 to 253g/L, the concentration of potassium hydroxide is 102 to 104g/L, the power frequency AC voltage is 143 to 145V and the spraying amount of the oxygen gas for each liter of treating liquid is 0.01 to 0.02L/s, the AZ91 magnesium alloy undergoes AC plasma micro-arc oxidation surface treatment for 45 to 56 seconds, so that a protective thin layer which is uniform in thickness and of which the thickness is 8 to 14 mu m is formed on the surface of the AZ91 magnesium alloy.
Description
Technical field
The present invention relates to a kind of AZ91 Mg alloy surface thin layer treatment process.
Background technology
Publication number: CN1900383A; denomination of invention: on " a kind of AZ91 surface treatment method of Mg alloy "; set forth AZ91 magnesium alloy ac plasma differential arc oxidation treatment method; promptly; employing contains the treatment solution of Potassium monofluoride and potassium hydroxide; power frequency AC by voltate regulator control provides electric energy; in cycle, utilize the yin, yang ion in the treatment solution to carry out the TRANSIENT HIGH TEMPERATURE of plasma micro-arc discharge generation at the AZ91 Mg alloy surface at each power frequency ac voltage at AZ91 Mg alloy surface formation protective layer.Utilize this ac plasma differential arc oxidation treatment method; disclosed Potassium monofluoride concentration is that 500～979g/L, concentration of potassium hydroxide are that 300～349g/L, power frequency ac voltage are under 68～80V condition in patent CN1900383A; can be in 60～90 seconds, make that AZ91 Mg alloy surface growth in situ goes out that 15～30 μ m are thick, homogeneous microstructure and complete oyster white protective layer.But, adopt the CN1900383A patented method at the thin layer of mean thickness below 15 μ m that the AZ91 Mg alloy surface forms, exist comparatively serious became uneven to spare phenomenon, its corrosion resistance nature is relatively poor.
For the sealer of AZ91 magnesium alloy, less especially when 15 μ m are following at mean thickness, its thickness is even more, and corrosion resistance nature is good more, and therefore, during less than 15 μ m, AZ91 Mg alloy surface thickness of thin layer is even more good more at mean thickness.
Summary of the invention
Technical problem to be solved by this invention is, overcome the deficiency of existing ac plasma differential arc oxidation treatment method " the skin layer thickness evenness is poor ", a kind of ac plasma differential arc oxidation treatment method that can form the uniform thin layer of thickness at the AZ91 Mg alloy surface is provided, further improves the thickness evenness of AZ91 Mg alloy surface thin layer.
The technical solution adopted for the present invention to solve the technical problems is: on ac plasma differential arc oxidation treatment method basis, in treatment solution, spray into oxygen to improve treatment solution and magnesium alloy reaction uniformity, and be that 251～253g/L, concentration of potassium hydroxide are that 102～104g/L, power frequency ac voltage are that 143～145V, every liter of treatment solution oxygen straying quatity are under 0.01～0.02L/s condition in Potassium monofluoride concentration, the AZ91 magnesium alloy is carried out 45～56 seconds ac plasma Microarc Oxidation Surface Treatment.
The invention has the beneficial effects as follows: for the sealer of magnesium alloy, want to improve the homogeneity of its thickness, must strengthen treatment solution and magnesium alloy are reacted inhomogeneity control.When magnesium alloy is carried out surface treatment, because the chemical ingredients of Mg alloy surface is different, therefore, under the effect of impressed electromotive force, ion in the treatment solution will converge to the little Mg alloy surface place of energy consumption, cause the inhomogeneous of surface reaction, thereby the became uneven that causes sealer, if when carrying out surface treatment, by in treatment solution, spraying into oxygen treatment solution is stirred, then the ion in the treatment solution will be dispersed in the treatment solution relatively equably, thereby can avoid a large amount of ions in the treatment solution to converge phenomenon to the little Mg alloy surface place of energy consumption, and then the homogeneity of Mg alloy surface protective layer thickness is improved; In addition; the high temperature that surface reaction produces can cause the oxygen that sprays in the treatment solution to form a large amount of oxygen plasmas; these oxygen plasmas have poising action to the reaction of Mg alloy surface; will further improve the homogeneity of surface reaction; the present invention utilizes the stirring action of the oxygen of each surface treatment parameter optimization combination back formation and the poising action that oxygen plasma reacts Mg alloy surface; further improve treatment solution and magnesium alloy reaction uniformity, thereby reached the inhomogeneity purpose of raising Mg alloy surface protective layer thickness.Utilize the present invention, the AZ91 magnesium alloy is carried out surface treatment, can in 45～56 seconds, obtain the thick protection thin layer of uniform 8～14 μ m of thickness.
Description of drawings
Fig. 1 carries out the front view of surface processing device to the AZ91 magnesium alloy for the inventive method.
Among the figure, power frequency AC 1, lead 2, voltate regulator 3, lead 4, AZ91 magnesium alloy workpiece 5, treatment solution 6, oxygen jet 7, oxygen pump 8, treatment trough 9.
Fig. 2 is the microtexture at the processing interface of adopting the inventive method that the AZ91 magnesium alloy is carried out to obtain after the surface treatment.
Embodiment
It is as follows in conjunction with the accompanying drawings the inventive method to be carried out specifying of surface processing device to the AZ91 magnesium alloy:
The AZ91 magnesium alloy is carried out surface processing device mainly to be comprised: power frequency AC 1, voltate regulator 3, oxygen jet 7, oxygen pump 8, treatment trough 9.
The input terminus of voltate regulator 3 links to each other by lead 2 with power frequency AC 1, and the output terminal of voltate regulator 2 links to each other by lead 4 with AZ91 magnesium alloy workpiece 5.Oxygen jet 7 adopts the teflon seal mode of connection to be fixed on the bottom of treatment trough 9, and the one end stretches in the treatment solution 6, and the other end links to each other with oxygen pump 8.
Power frequency AC 1 is an industry power frequency AC commonly used.Voltate regulator 3 can adopt the Mg alloy surface of buying on the market that can provide to handle the voltate regulator of any model of required electric energy.Oxygen jet 7 is a tetrafluoroethylene with the material of treatment trough 9.AZ91 magnesium alloy workpiece 5 need carry out oil removing, polishing and cleaning pre-treatment.
A kind of AZ91 Mg alloy surface thin layer treatment process, adopt the ac plasma differential arc oxidation treatment method that the AZ91 magnesium alloy is carried out surface treatment, in treatment solution, spray into oxygen carrying out preceding 1 minute of surface treatment beginning, and be that 251～253g/L, concentration of potassium hydroxide are that 102～104g/L, power frequency ac voltage are that 143～145V, every liter of treatment solution oxygen straying quatity are under 0.01～0.02L/s condition in Potassium monofluoride concentration, the AZ91 magnesium alloy is carried out 45～56 seconds ac plasma Microarc Oxidation Surface Treatment.
Embodiment one, in Potassium monofluoride concentration is that 251g/L, concentration of potassium hydroxide are that 102g/L, power frequency ac voltage are that 143V, every liter of treatment solution oxygen straying quatity are under the 0.01L/s condition, after the ac plasma Microarc Oxidation Surface Treatment 45 seconds, can form the thick thin layer of the uniform 8 μ m of thickness at the AZ91 magnesium alloy work-piece surface.
Embodiment two, in Potassium monofluoride concentration is that 251g/L, concentration of potassium hydroxide are that 104g/L, power frequency ac voltage are that 145V, every liter of treatment solution oxygen straying quatity are under the 0.01L/s condition, after the ac plasma Microarc Oxidation Surface Treatment 45 seconds, can form the thick thin layer of the uniform 10 μ m of thickness at the AZ91 magnesium alloy work-piece surface.
Embodiment three, in Potassium monofluoride concentration is that 253g/L, concentration of potassium hydroxide are that 102g/L, power frequency ac voltage are that 143V, every liter of treatment solution oxygen straying quatity are under the 0.02L/s condition, after the ac plasma Microarc Oxidation Surface Treatment 56 seconds, can form the thick thin layer of the uniform 12 μ m of thickness at the AZ91 magnesium alloy work-piece surface.
Embodiment four, in Potassium monofluoride concentration is that 253g/L, concentration of potassium hydroxide are that 104g/L, power frequency ac voltage are that 145V, every liter of treatment solution oxygen straying quatity are under the 0.01L/s condition, after the ac plasma Microarc Oxidation Surface Treatment 56 seconds, can form the thick thin layer of the uniform 14 μ m of thickness at the AZ91 magnesium alloy work-piece surface.
Embodiment five, in Potassium monofluoride concentration is that 251g/L, concentration of potassium hydroxide are that 102g/L, power frequency ac voltage are that 145V, every liter of treatment solution oxygen straying quatity are under the 0.02L/s condition, after the ac plasma Microarc Oxidation Surface Treatment 45 seconds, can form the thick thin layer of the uniform 10 μ m of thickness at the AZ91 magnesium alloy work-piece surface.
As seen; in Potassium monofluoride concentration is that 251～253g/L, concentration of potassium hydroxide are that 102～104g/L, power frequency ac voltage are that 143～145V, every liter of treatment solution oxygen straying quatity are under 0.01～0.02L/s condition; the AZ91 magnesium alloy is carried out 45～56 seconds ac plasma Microarc Oxidation Surface Treatment, can form the thick protection thin layer of uniform 8～14 μ m of thickness at the AZ91 Mg alloy surface.
Claims (1)
1. AZ91 Mg alloy surface thin layer treatment process, adopt the ac plasma differential arc oxidation treatment method that the AZ91 magnesium alloy is carried out surface treatment, it is characterized in that, in treatment solution, spray into oxygen carrying out preceding 1 minute of surface treatment beginning, and be that 251～253g/L, concentration of potassium hydroxide are that 102～104g/L, power frequency ac voltage are that 143～145V, every liter of treatment solution oxygen straying quatity are under 0.01～0.02L/s condition in Potassium monofluoride concentration, the AZ91 magnesium alloy is carried out 45～56 seconds ac plasma Microarc Oxidation Surface Treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101015195A CN102181909B (en) | 2011-04-22 | 2011-04-22 | Thin layer treatment method for surface of AZ91 magnesium alloy |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011101015195A CN102181909B (en) | 2011-04-22 | 2011-04-22 | Thin layer treatment method for surface of AZ91 magnesium alloy |
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| CN102181909A true CN102181909A (en) | 2011-09-14 |
| CN102181909B CN102181909B (en) | 2012-07-11 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5554594A (en) * | 1978-10-12 | 1980-04-21 | Tanaka Kenji | Anodic oxidation treating method of magnesium and magnesium alloy |
| WO2001081658A1 (en) * | 2000-04-26 | 2001-11-01 | Jacques Beauvir | Oxidising electrolytic method for obtaining a ceramic coating at the surface of a metal |
| CN1405361A (en) * | 2002-10-31 | 2003-03-26 | 上海交通大学 | Magnesium alloy ultrasonic anode oxidation method |
| CN1730726A (en) * | 2005-07-01 | 2006-02-08 | 北京交通大学 | Magnesium alloy portable computer external surface treatment method |
| CN1900383A (en) * | 2006-07-05 | 2007-01-24 | 北京交通大学 | AZ91 magnesium alloy surface treating method |
-
2011
- 2011-04-22 CN CN2011101015195A patent/CN102181909B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5554594A (en) * | 1978-10-12 | 1980-04-21 | Tanaka Kenji | Anodic oxidation treating method of magnesium and magnesium alloy |
| WO2001081658A1 (en) * | 2000-04-26 | 2001-11-01 | Jacques Beauvir | Oxidising electrolytic method for obtaining a ceramic coating at the surface of a metal |
| CN1405361A (en) * | 2002-10-31 | 2003-03-26 | 上海交通大学 | Magnesium alloy ultrasonic anode oxidation method |
| CN1730726A (en) * | 2005-07-01 | 2006-02-08 | 北京交通大学 | Magnesium alloy portable computer external surface treatment method |
| CN1900383A (en) * | 2006-07-05 | 2007-01-24 | 北京交通大学 | AZ91 magnesium alloy surface treating method |
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