CN105483482B - A kind of heat-resistant antifriction magnesium alloy and preparation method thereof - Google Patents
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Abstract
The present invention relates to technical field of magnesium alloy material, especially a kind of heat-resistant antifriction magnesium alloy and preparation method thereof, pass through the proportion design to magnesium alloy component, so that magnesium alloy component interacts, and then while magnesium alloy toughness is improved, improve the intensity of magnesium alloy, improve the anti-wear performance of magnesium alloy；Pass through the restriction to magnesium alloy step of preparation process and technological parameter so that be internally formed Al Ni phases in magnesium alloy, improve the toughness of magnesium alloy, and improve the anti-wear performance of magnesium alloy；In conjunction with the processing of acetone ethanol mixed liquor, so that Mg alloy surface contains one layer of organic phase, the function that impurity is purged to Mg alloy surface is not only reached, also so that it plays catalytic action so that magnesium alloy combines the processing of phosphating solution after immersing dissolved with the cerium salt conversion fluid and oxygen carbon sulphur permeation liquid of organosilicon, improve the anti-wear performance of magnesium alloy, the membrane structure of Mg alloy surface is strengthened, strengthen the effect of heat insulation of membrane structure, improve the heat resistance of magnesium alloy.
Description
Technical field
The present invention relates to technical field of magnesium alloy material, especially a kind of heat-resistant antifriction magnesium alloy and preparation method thereof.
Background technology
With the development of science and technology, strided forward now in the design of various products both facing to the target of light weight, weight environmental protection, because
This, the exploitation and characteristic selection for product material are upper, it is necessary to make considerable degree of consideration.Magnesium alloy is as most light metal knot
Structure material, there is higher specific strength and specific stiffness, excellent damping capacity and good casting character and machining property,
" the green structural material of 21 century " is described as, is with a wide range of applications.In the conventional cast magnesium alloy trade mark, ZK60
Alloy has obtained extensive commercial Application with its excellent room-temperature mechanical property and preferable mechanical behavior under high temperature.But due to this
Alloy is also easy to produce microsegregation and loose shrinkage cavity in casting, while the melting of the alloy and casting technique are also more complicated,
Serious Inclusion Problem in production be present, hot cracking tendency is serious, so as to cause its elevated temperature strength still can not meet that some are special
Requirement under environment.
In addition, due to the special performance of magnesium alloy itself so that magnesium alloy is highly prone to corrode, and easily becomes after being heated
Shape, and abrasion resistance properties are also poor, and then the further application of magnesium alloy materials is have impact on, in consideration of it, this researcher ties
The research to magnesium alloy component proportioning is closed, by being explored to magnesium alloy preparation technology so that the Mg alloy surface shape of acquisition
Into layer protecting film layer, a kind of new product is provided for field of magnesium alloy.
The content of the invention
In order to solve above-mentioned technical problem present in prior art, the present invention provide a kind of heat-resistant antifriction magnesium alloy and its
Preparation method.
It is achieved particular by following technical scheme：
A kind of heat-resistant antifriction magnesium alloy, component are Zn2.1-3.5%, Zr0.6-0.9%, Er3.1- by mass percentage
4.2%, Nd0.7-1.3%, Si0.01-0.08%, Al11-13%, Ni6-8%, surplus are Mg and essential impurity.
Described component is Zn2.7%, Zr0.8%, Er3.7% by mass percentage, Nd0.9%, Si0.06%,
Al12%, Ni7%, surplus are Mg and essential impurity.
The preparation method of described heat-resistant antifriction magnesium alloy, including melting and heat treatment step, specifically include following steps：
(1) by Mg in smelting furnace heating be smelted into liquid magnesium, and in fusion process, using sulfur hexafluoride-nitrogen
Mixed gas is as protective gas；
(2) temperature for controlling liquid magnesium is 600-650 DEG C, adds Al and Ni components, isothermal holding 10-20min thereto
Afterwards, then thereto Zn, Zr, Er, Nd, Si are added, and is adjusted to 780-800 DEG C, isothermal holding 10-20min, then
Greenhouse cooling to 700-740 DEG C, then is carried out refining 7-9min by 10-20s, is stood 10-20min, is treated that magnesium liquid is cooled to temperature and is
After 660-680 DEG C, except removing dross is cast, normal temperature is cooled to, obtains magnesium alloy ingot；
(3) by magnesium alloy ingot immersion in acetone, and ethanol is added thereto, used supersonic frequency as 30-300Hz
Handle 10-20min；
(4) magnesium alloy ingot that step (3) processing is completed is warming up to temperature as 100-150 DEG C, is incubated 2-4h, it is molten immersing
Have in the cerium salt conversion fluid of organosilicon, immersion treatment 1-2min, then be drawn off, rinsed well using clear water, and used
Temperature is 60-80 DEG C of drying；Magnesium alloy ingot temperature is adjusted again as 300-340 DEG C, and is immersed in oxygen carbon sulphur permeation liquid, is incubated
10-30min, then after being drawn off, use temperature to be rinsed well for 1-5 DEG C of phosphating solution immersion treatment 3-7min using clear water,
.
Described ethanol, addition are the 10-20% of acetone quality.
Described cerium salt conversion fluid contain 10~20g/L of cerium salt, 10~40ml/L of primary oxidant, cooxidant 200~
300g/L, 5~8g/L of organosilicon, 1.5~2g/L of film forming accelerating, conversion fluid pH value are 2.5~4.5；Cerium salt is chloride hydrate
Sub- cerium；Primary oxidant is hydrogen peroxide；Cooxidant is sodium perchlorate；Organosilicon is vinyltrimethoxy silane；Film forming
Accelerator is sodium benzoate and/or benzotriazole.
Described oxygen carbon sulphur permeation liquid, every liter contains molten salt composition：Natrium nitrosum 40-50g, potassium carbonate 8-10g, nitric acid
Potassium 20-40g, lithium hydroxide 40-60g, sodium hydroxide 30-50g, potassium hydroxide 23-31g, vulcanized sodium 47-53g, CNO-23-
30g。
Described phosphating solution, to contain NaOH40~60g/L, Na3PO4·12H2O10~20g/L the aqueous solution.
Compared with prior art, its technique effect is embodied in：
Pass through the proportion design to magnesium alloy component so that magnesium alloy component interacts, and then tough improving magnesium alloy
While property, improve the intensity of magnesium alloy, improve the anti-wear performance of magnesium alloy；By to magnesium alloy step of preparation process and work
The restriction of skill parameter so that be internally formed Al-Ni phases in magnesium alloy, improve the toughness of magnesium alloy, and improve the resistance to of magnesium alloy
Grind performance；In conjunction with the processing of acetone ethanol mixed liquor so that Mg alloy surface contains one layer of organic phase, does not only reach and magnesium is closed
Gold surface is purged the function of impurity, also causes it to play catalytic action so that magnesium alloy is immersing the cerium dissolved with organosilicon
After salt conversion fluid and oxygen carbon sulphur permeation liquid, double membrane structure can be formed on its surface, improve the anti-wear performance of magnesium alloy, and
With reference to the further processing of phosphating solution so that the membrane structure of Mg alloy surface is strengthened, and enhances the heat-insulated effect of membrane structure
Fruit, improve the heat resistance of magnesium alloy.
This researcher tests the hardness and thickness measurement of the embodiment 1-5 magnesium alloys treated and aluminium alloy, and it is determined
As a result it is that protection film layer hardness is Hv0.05140-145, coating layer thickness are 60-70 microns.In addition, it has also carried out salt fog corruption
Erosion experiment, its result do not have corrosion phenomenon in 110h；And salt spray test is also used into a variety of salt fog alternate treatments, its
98h does not have found any corrosion phenomenon；Its anti-wear performance can be substantially better than the anti-wear performance of matrix.
In addition, the magnesium alloy that embodiment 1 obtains also is heated at high temperature by this researcher, determines the deformation of magnesium alloy
Coefficient, show that its deformation coefficient is relatively low, when temperature reaches 500 DEG C, it there are no obvious deformation.
Embodiment
Limited with reference to specific embodiment technical scheme is further, but claimed
Scope is not only limited to made description.
Embodiment 1
A kind of heat-resistant antifriction magnesium alloy, component are Zn2.1%, Zr0.6%, Er3.1% by mass percentage,
Nd0.7%, Si0.01%, Al11%, Ni6%, surplus are Mg and essential impurity.
The preparation method of described heat-resistant antifriction magnesium alloy, including melting and heat treatment step, specifically include following steps：
(1) by Mg in smelting furnace heating be smelted into liquid magnesium, and in fusion process, using sulfur hexafluoride-nitrogen
Mixed gas is as protective gas；
(2) temperature for controlling liquid magnesium is 600 DEG C, thereto addition Al and Ni components, after isothermal holding 10min, then to
Wherein add Zn, Zr, Er, Nd, Si, and be adjusted to 780 DEG C, isothermal holding 10min, then 10s by greenhouse cooling extremely
700 DEG C, then refining 7min is carried out, 10min is stood, after magnesium liquid is cooled to temperature as 660 DEG C, except removing dross is cast, is cooled to
Normal temperature, obtain magnesium alloy ingot；
(3) by magnesium alloy ingot immersion in acetone, and ethanol is added thereto, used supersonic frequency as 30Hz processing
10min；
(4) magnesium alloy ingot that step (3) processing is completed is warming up to temperature as 100 DEG C, is incubated 2h, immersed dissolved with organic
In the cerium salt conversion fluid of silicon, immersion treatment 1min, then be drawn off, rinsed well using clear water, and used temperature as 60
DEG C drying；Magnesium alloy ingot temperature is adjusted again as 300 DEG C, and is immersed in oxygen carbon sulphur permeation liquid, is incubated 10min, then be drawn off
Afterwards, temperature is used to be rinsed well for 1 DEG C of phosphating solution immersion treatment 3min using clear water, you can.
Described ethanol, addition are the 10% of acetone quality.
Described cerium salt conversion fluid contains cerium salt 10g/L, primary oxidant 10ml/L, cooxidant 200g/L, organosilicon
5g/L, film forming accelerating 1.5g/L, conversion fluid pH value are 2.5；Cerium salt is chloride hydrate Asia cerium；Primary oxidant is hydrogen peroxide；
Cooxidant is sodium perchlorate；Organosilicon is vinyltrimethoxy silane；Film forming accelerating is sodium benzoate.
Described oxygen carbon sulphur permeation liquid, every liter contains molten salt composition：Natrium nitrosum 40g, potassium carbonate 8g, potassium nitrate 20g,
Lithium hydroxide 40g, sodium hydroxide 30g, potassium hydroxide 23g, vulcanized sodium 47g, CNO-23g。
Described phosphating solution, to contain NaOH40g/L, Na3PO4·12H2The O10g/L aqueous solution.
Embodiment 2
A kind of heat-resistant antifriction magnesium alloy, component are Zn3.5%, Zr0.9%, Er4.2% by mass percentage,
Nd1.3%, Si0.08%, Al13%, Ni8%, surplus are Mg and essential impurity.
The preparation method of described heat-resistant antifriction magnesium alloy, including melting and heat treatment step, specifically include following steps：
(1) by Mg in smelting furnace heating be smelted into liquid magnesium, and in fusion process, using sulfur hexafluoride-nitrogen
Mixed gas is as protective gas；
(2) temperature for controlling liquid magnesium is 650 DEG C, thereto addition Al and Ni components, after isothermal holding 20min, then to
Wherein add Zn, Zr, Er, Nd, Si, and be adjusted to 800 DEG C, isothermal holding 20min, then 20s by greenhouse cooling extremely
740 DEG C, then refining 9min is carried out, 20min is stood, after magnesium liquid is cooled to temperature as 680 DEG C, except removing dross is cast, is cooled to
Normal temperature, obtain magnesium alloy ingot；
(3) by magnesium alloy ingot immersion in acetone, and add ethanol thereto, used supersonic frequency for 300Hz at
Manage 20min；
(4) magnesium alloy ingot that step (3) processing is completed is warming up to temperature as 150 DEG C, is incubated 4h, immersed dissolved with organic
In the cerium salt conversion fluid of silicon, immersion treatment 2min, then be drawn off, rinsed well using clear water, and used temperature as 80
DEG C drying；Magnesium alloy ingot temperature is adjusted again as 340 DEG C, and is immersed in oxygen carbon sulphur permeation liquid, is incubated 30min, then be drawn off
Afterwards, temperature is used to be rinsed well for 5 DEG C of phosphating solution immersion treatment 7min using clear water, you can.
Described ethanol, addition are the 20% of acetone quality.
Described cerium salt conversion fluid contains cerium salt 20g/L, primary oxidant 40ml/L, cooxidant 300g/L, organosilicon
8g/L, film forming accelerating 2g/L, conversion fluid pH value are 4.5；Cerium salt is chloride hydrate Asia cerium；Primary oxidant is hydrogen peroxide；It is auxiliary
Pro-oxidant is sodium perchlorate；Organosilicon is vinyltrimethoxy silane；Film forming accelerating is benzotriazole.
Described oxygen carbon sulphur permeation liquid, every liter contains molten salt composition：Natrium nitrosum 50g, potassium carbonate 10g, potassium nitrate
40g, lithium hydroxide 60g, sodium hydroxide 50g, potassium hydroxide 31g, vulcanized sodium 53g, CNO-30g。
Described phosphating solution, to contain NaOH60g/L, Na3PO4·12H2The O20g/L aqueous solution.
Embodiment 3
A kind of heat-resistant antifriction magnesium alloy, component are Zn2.7%, Zr0.8%, Er3.7% by mass percentage,
Nd0.9%, Si0.06%, Al12%, Ni7%, surplus are Mg and essential impurity.
The preparation method of described heat-resistant antifriction magnesium alloy, including melting and heat treatment step, specifically include following steps：
(1) by Mg in smelting furnace heating be smelted into liquid magnesium, and in fusion process, using sulfur hexafluoride-nitrogen
Mixed gas is as protective gas；
(2) temperature for controlling liquid magnesium is 630 DEG C, thereto addition Al and Ni components, after isothermal holding 15min, then to
Wherein add Zn, Zr, Er, Nd, Si, and be adjusted to 790 DEG C, isothermal holding 15min, then 15s by greenhouse cooling extremely
730 DEG C, then refining 8min is carried out, 15min is stood, after magnesium liquid is cooled to temperature as 670 DEG C, except removing dross is cast, is cooled to
Normal temperature, obtain magnesium alloy ingot；
(3) by magnesium alloy ingot immersion in acetone, and add ethanol thereto, used supersonic frequency for 100Hz at
Manage 15min；
(4) magnesium alloy ingot that step (3) processing is completed is warming up to temperature as 130 DEG C, is incubated 3h, immersed dissolved with organic
In the cerium salt conversion fluid of silicon, immersion treatment 1.5min, then be drawn off is rinsed well using clear water, and used temperature for
70 DEG C of drying；Magnesium alloy ingot temperature is adjusted again as 330 DEG C, and is immersed in oxygen carbon sulphur permeation liquid, is incubated 20min, then taken
After going out, temperature is used to be rinsed well for 3 DEG C of phosphating solution immersion treatment 5min using clear water, you can.
Described ethanol, addition are the 15% of acetone quality.
Described cerium salt conversion fluid contains cerium salt 15g/L, primary oxidant 30ml/L, cooxidant 250g/L, organosilicon
7g/L, film forming accelerating 1.8g/L, conversion fluid pH value are 3.5；Cerium salt is chloride hydrate Asia cerium；Primary oxidant is hydrogen peroxide；
Cooxidant is sodium perchlorate；Organosilicon is vinyltrimethoxy silane；Film forming accelerating is sodium benzoate and benzene a pair of horses going side by side three
Nitrogen azoles is arbitrarily than mixing.
Described oxygen carbon sulphur permeation liquid, every liter contains molten salt composition：Natrium nitrosum 45g, potassium carbonate 9g, potassium nitrate 30g,
Lithium hydroxide 50g, sodium hydroxide 40g, potassium hydroxide 27g, vulcanized sodium 50g, CNO-27g。
Described phosphating solution, to contain NaOH50g/L, Na3PO4·12H2The O15g/L aqueous solution.
Embodiment 4
A kind of heat-resistant antifriction magnesium alloy, component are Zn2.1%, Zr0.9%, Er3.1% by mass percentage,
Nd0.7%, Si0.08%, Al11%, Ni8%, surplus are Mg and essential impurity.
The preparation method of described heat-resistant antifriction magnesium alloy, including melting and heat treatment step, specifically include following steps：
(1) by Mg in smelting furnace heating be smelted into liquid magnesium, and in fusion process, using sulfur hexafluoride-nitrogen
Mixed gas is as protective gas；
(2) temperature for controlling liquid magnesium is 640 DEG C, thereto addition Al and Ni components, after isothermal holding 10min, then to
Wherein add Zn, Zr, Er, Nd, Si, and be adjusted to 800 DEG C, isothermal holding 10min, then 20s by greenhouse cooling extremely
700 DEG C, then refining 7min is carried out, 20min is stood, after magnesium liquid is cooled to temperature as 660 DEG C, except removing dross is cast, is cooled to
Normal temperature, obtain magnesium alloy ingot；
(3) by magnesium alloy ingot immersion in acetone, and add ethanol thereto, used supersonic frequency for 200Hz at
Manage 10min；
(4) magnesium alloy ingot that step (3) processing is completed is warming up to temperature as 150 DEG C, is incubated 2h, immersed dissolved with organic
In the cerium salt conversion fluid of silicon, immersion treatment 1min, then be drawn off, rinsed well using clear water, and used temperature as 60
DEG C drying；Magnesium alloy ingot temperature is adjusted again as 340 DEG C, and is immersed in oxygen carbon sulphur permeation liquid, is incubated 10min, then be drawn off
Afterwards, temperature is used to be rinsed well for 1 DEG C of phosphating solution immersion treatment 7min using clear water, you can.
Described ethanol, addition are the 10% of acetone quality.
Described cerium salt conversion fluid contains cerium salt 10g/L, primary oxidant 40ml/L, cooxidant 200g/L, organosilicon
5g/L, film forming accelerating 2g/L, conversion fluid pH value are 2.5；Cerium salt is chloride hydrate Asia cerium；Primary oxidant is hydrogen peroxide；It is auxiliary
Pro-oxidant is sodium perchlorate；Organosilicon is vinyltrimethoxy silane；Film forming accelerating is sodium benzoate.
Described oxygen carbon sulphur permeation liquid, every liter contains molten salt composition：Natrium nitrosum 40g, potassium carbonate 8g, potassium nitrate 40g,
Lithium hydroxide 40g, sodium hydroxide 50g, potassium hydroxide 23g, vulcanized sodium 53g, CNO-30g。
Described phosphating solution, to contain NaOH40g/L, Na3PO4·12H2The O10g/L aqueous solution.
Embodiment 5
A kind of heat-resistant antifriction magnesium alloy, component are Zn3.5%, Zr0.9%, Er4.2% by mass percentage,
Nd0.7%, Si0.08%, Al12%, Ni7%, surplus are Mg and essential impurity.
The preparation method of described heat-resistant antifriction magnesium alloy, including melting and heat treatment step, specifically include following steps：
(1) by Mg in smelting furnace heating be smelted into liquid magnesium, and in fusion process, using sulfur hexafluoride-nitrogen
Mixed gas is as protective gas；
(2) temperature for controlling liquid magnesium is 650 DEG C, thereto addition Al and Ni components, after isothermal holding 20min, then to
Wherein add Zn, Zr, Er, Nd, Si, and be adjusted to 780 DEG C, isothermal holding 20min, then 10s by greenhouse cooling extremely
740 DEG C, then refining 7min is carried out, 20min is stood, after magnesium liquid is cooled to temperature as 680 DEG C, except removing dross is cast, is cooled to
Normal temperature, obtain magnesium alloy ingot；
(3) by magnesium alloy ingot immersion in acetone, and ethanol is added thereto, used supersonic frequency as 30Hz processing
10min；
(4) magnesium alloy ingot that step (3) processing is completed is warming up to temperature as 150 DEG C, is incubated 2h, immersed dissolved with organic
In the cerium salt conversion fluid of silicon, immersion treatment 1min, then be drawn off, rinsed well using clear water, and used temperature as 80
DEG C drying；Magnesium alloy ingot temperature is adjusted again as 310 DEG C, and is immersed in oxygen carbon sulphur permeation liquid, is incubated 10min, then be drawn off
Afterwards, temperature is used to be rinsed well for 1 DEG C of phosphating solution immersion treatment 7min using clear water, you can.
Described ethanol, addition are the 20% of acetone quality.
Described cerium salt conversion fluid contains cerium salt 20g/L, primary oxidant 10ml/L, cooxidant 200g/L, organosilicon
8g/L, film forming accelerating 1.5g/L, conversion fluid pH value are 4.5；Cerium salt is chloride hydrate Asia cerium；Primary oxidant is hydrogen peroxide；
Cooxidant is sodium perchlorate；Organosilicon is vinyltrimethoxy silane；Film forming accelerating is benzotriazole.
Described oxygen carbon sulphur permeation liquid, every liter contains molten salt composition：Natrium nitrosum 50g, potassium carbonate 8g, potassium nitrate 20g,
Lithium hydroxide 60g, sodium hydroxide 30g, potassium hydroxide 31g, vulcanized sodium 47g, CNO-23g。
Described phosphating solution, to contain NaOH50g/L, Na3PO4·12H2The O15g/L aqueous solution.
Claims (6)
1. a kind of heat-resistant antifriction magnesium alloy, it is characterised in that component is Zn2.1-3.5%, Zr0.6- by mass percentage
0.9%th, Er3.1-4.2%, Nd0.7-1.3%, Si0.01-0.08%, Al11-13%, Ni6-8%, surplus are Mg and must
Indispensable impurity；
Preparation method includes melting and heat treatment step, specifically includes following steps：
(1) Mg is heated in smelting furnace and is smelted into liquid magnesium, and in fusion process, using sulfur hexafluoride-nitrogen mixture
Body is as protective gas；
(2) temperature for controlling liquid magnesium is 600-650 DEG C, thereto addition Al and Ni components, after isothermal holding 10-20min, then
Zn, Zr, Er, Nd, Si are added thereto, and are adjusted to 780-800 DEG C, isothermal holding 10-20min, then in 10-20s
By greenhouse cooling to 700-740 DEG C, then refining 7-9min is carried out, stand 10-20min, it is 660-680 to treat that magnesium liquid is cooled to temperature
After DEG C, except removing dross is cast, normal temperature is cooled to, obtains magnesium alloy ingot；
(3) by magnesium alloy ingot immersion in acetone, and ethanol is added thereto, used supersonic frequency as 30-300Hz processing
10-20min；
(4) magnesium alloy ingot that step (3) processing is completed is warming up to temperature as 100-150 DEG C, is incubated 2-4h, immersed dissolved with having
In the cerium salt conversion fluid of machine silicon, immersion treatment 1-2min, then be drawn off, rinsed well using clear water, and used temperature
For 60-80 DEG C of drying；Magnesium alloy ingot temperature is adjusted again as 300-340 DEG C, and is immersed in oxygen carbon sulphur permeation liquid, is incubated 10-
30min, then after being drawn off, use temperature to be rinsed well for 1-5 DEG C of phosphating solution immersion treatment 3-7min using clear water, i.e.,
Can.
2. heat-resistant antifriction magnesium alloy as claimed in claim 1, it is characterised in that described component is by mass percentage
Zn2.7%, Zr0.8%, Er3.7%, Nd0.9%, Si0.06%, Al12%, Ni7%, surplus are Mg and essential
Impurity.
3. the preparation method of heat-resistant antifriction magnesium alloy as claimed in claim 1, it is characterised in that described ethanol, addition
For the 10-20% of acetone quality.
4. the preparation method of heat-resistant antifriction magnesium alloy as claimed in claim 1, it is characterised in that described cerium salt conversion fluid contains
There are 10~20g/L of cerium salt, 10~40ml/L of primary oxidant, 200~300g/L of cooxidant, 5~8g/L of organosilicon, film forming to promote
Enter 1.5~2g/L of agent, conversion fluid pH value is 2.5~4.5；Cerium salt is chloride hydrate Asia cerium；Primary oxidant is hydrogen peroxide；Auxiliary
Oxidant is sodium perchlorate；Organosilicon is vinyltrimethoxy silane；Film forming accelerating is sodium benzoate and/or parallel three nitrogen of benzene
Azoles.
5. the preparation method of heat-resistant antifriction magnesium alloy as claimed in claim 1, it is characterised in that described oxygen carbon sulphur permeation liquid
Body, every liter contains molten salt composition：Natrium nitrosum 40-50g, potassium carbonate 8-10g, potassium nitrate 20-40g, lithium hydroxide 40-60g, hydrogen
Sodium oxide molybdena 30-50g, potassium hydroxide 23-31g, vulcanized sodium 47-53g, CNO-23-30g。
6. the preparation method of heat-resistant antifriction magnesium alloy as claimed in claim 1, it is characterised in that described phosphating solution, for containing
There are NaOH40~60g/L, Na3PO4·12H2O10~20g/L the aqueous solution.
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