CN101886258B - Method for preparing magnesium alloy surface conversion corrosion-resistant film layer - Google Patents
Method for preparing magnesium alloy surface conversion corrosion-resistant film layer Download PDFInfo
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 73
- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 40
- 230000007797 corrosion Effects 0.000 title abstract description 22
- 238000005260 corrosion Methods 0.000 title abstract description 22
- 238000011282 treatment Methods 0.000 claims abstract description 82
- 239000003513 alkali Substances 0.000 claims abstract description 35
- 239000000126 substance Substances 0.000 claims abstract description 23
- 238000005238 degreasing Methods 0.000 claims abstract description 19
- 239000004519 grease Substances 0.000 claims abstract description 4
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 44
- 238000004140 cleaning Methods 0.000 claims description 36
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 33
- 238000012545 processing Methods 0.000 claims description 14
- 230000000694 effects Effects 0.000 claims description 12
- 101100513612 Microdochium nivale MnCO gene Proteins 0.000 claims description 11
- 230000006698 induction Effects 0.000 claims description 11
- 238000010129 solution processing Methods 0.000 claims description 11
- 239000003795 chemical substances by application Substances 0.000 claims description 10
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 claims description 10
- 150000002500 ions Chemical class 0.000 claims description 7
- 238000005520 cutting process Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 2
- 239000007788 liquid Substances 0.000 abstract description 6
- 230000009471 action Effects 0.000 abstract description 4
- 238000001035 drying Methods 0.000 abstract 2
- 238000005406 washing Methods 0.000 abstract 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 12
- 230000008569 process Effects 0.000 description 12
- 230000010287 polarization Effects 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 9
- 238000010438 heat treatment Methods 0.000 description 9
- 238000004506 ultrasonic cleaning Methods 0.000 description 8
- 239000002245 particle Substances 0.000 description 6
- 239000011780 sodium chloride Substances 0.000 description 6
- 208000037656 Respiratory Sounds Diseases 0.000 description 4
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 4
- 238000002203 pretreatment Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical class OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- IMQLKJBTEOYOSI-GPIVLXJGSA-N Inositol-hexakisphosphate Chemical compound OP(O)(=O)O[C@H]1[C@H](OP(O)(O)=O)[C@@H](OP(O)(O)=O)[C@H](OP(O)(O)=O)[C@H](OP(O)(O)=O)[C@@H]1OP(O)(O)=O IMQLKJBTEOYOSI-GPIVLXJGSA-N 0.000 description 1
- IMQLKJBTEOYOSI-UHFFFAOYSA-N Phytic acid Natural products OP(O)(=O)OC1C(OP(O)(O)=O)C(OP(O)(O)=O)C(OP(O)(O)=O)C(OP(O)(O)=O)C1OP(O)(O)=O IMQLKJBTEOYOSI-UHFFFAOYSA-N 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000037427 ion transport Effects 0.000 description 1
- 230000005426 magnetic field effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- MEFBJEMVZONFCJ-UHFFFAOYSA-N molybdate Chemical compound [O-][Mo]([O-])(=O)=O MEFBJEMVZONFCJ-UHFFFAOYSA-N 0.000 description 1
- 150000003016 phosphoric acids Chemical class 0.000 description 1
- 239000000467 phytic acid Substances 0.000 description 1
- 229940068041 phytic acid Drugs 0.000 description 1
- 235000002949 phytic acid Nutrition 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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Abstract
The invention discloses a method for preparing a magnesium alloy surface conversion corrosion-resistant film layer, which comprises the following steps: (1) degreasing treatment: removing grease on the surface of the magnesium alloy; (2) alkali washing treatment: further degreasing with alkali wash and the residue left from the degreasing treatment; (3) rinsing treatment: rinsing the magnesium alloy subjected to alkali washing treatment; (3) drying treatment: drying the magnesium alloy; (4) chromium-free chemical conversion treatment: immersing the magnesium alloy into chromium-free chemical treatment liquid to form a film; characterized in that the chromium-free chemical conversion treatment is carried out simultaneously with the conversion treatment under the action of an external magnetic field. The method optimizes the uniformity, compactness and chemical properties of the conversion film through an external magnetic field.
Description
Technical field
The present invention relates to a kind of surface treatment method of Mg alloy, relate in particular to a kind of method for preparing conversion wear-resistance film layer on magnesium alloy surface of externally-applied magnetic field.
Background technology
It is low that magnesiumalloy has density, and premium properties such as specific tenacity, specific rigidity height and be easy to reclaim is described as 21 century green engineering material.But the corrosion resistance nature of magnesiumalloy is relatively poor; Reason is to be that the standard potential of magnesium is minimum in all structural metals on the one hand; On the other hand; The Mg alloy surface sull is cell texture, and magnesium alloy substrate is not had good corrosion prevention effect, and this has greatly limited the Application of Magnesium scope.Chemically on Mg alloy surface, produce the compound conversion film of one deck and matrix mortise, can significantly improve the corrosion resistance of magnesium alloy ability.Traditional main employing of magnesium alloy chemical conversion processing technology contained the chromate conversion treatments technology, and environment has very big harm but chromate conversion treatments liquid contains high pollution property chemical substance Cr6+ pair ion, in addition; The rete of chromate conversion technology gained exists a large amount of tiny cracks and hole, and corrosion resisting property is undesirable, has become the bottleneck of restriction conversion film technical development.Therefore, realize Sustainable development for the protection environment, people just do not stop to seek the Chrome-free transformation technology of alternative chromate conversion technology always.Magnesiumalloy transformation technologies such as phosphoric acid salt, phosphoric acid salt-permanganate, molybdate, rare earth and phytic acid had once been studied.But all exist a large amount of tiny cracks and hole equally owing to transform rete, shortcomings such as bonding force difference are difficult to satisfy the needs of actual engineering.
Existing conversion treatment device mainly comprises power supply, treatment trough, heating unit, temperature control unit and glass stick.The conversion method of disposal is following: treatment solution in the treatment trough is heated, and devices such as use thermopair are controlled the temperature of treatment solution, and with continuous stirring.This prepares, and the method for conversion film is simple and practical, cost is low, has ubiquity and versatility.Yet make in this way, the chemical reaction of particle is disorderly and unsystematic, is unfavorable for controlling the generation of conversion film, and the homogeneity of conversion film, compactness and chemical property are relatively poor.
Summary of the invention
In view of this, the purpose of this invention is to provide a kind of method for preparing conversion wear-resistance film layer on magnesium alloy surface, this method is optimized homogeneity, compactness and the chemical property of conversion film through externally-applied magnetic field.
Above-mentioned purpose realizes through following proposal:
A kind of method for preparing conversion wear-resistance film layer on magnesium alloy surface, the step of this method comprises:
(1) skimming treatment: the grease of removing Mg alloy surface;
(2) alkali cleaning is handled: the residue that adopts further degreasing of alkali cleaning and said skimming treatment to stay;
(3) rinsing processing: the magnesiumalloy to after the alkali cleaning processing carries out rinsing;
(3) oven dry is handled: with said magnesiumalloy oven dry;
(4) the Chrome-free chemical conversion is handled: magnesiumalloy is immersed film forming in the Chrome-free chemical pretreatment solution;
It is characterized in that; When said Chrome-free chemical conversion is handled; Under the effect of externally-applied magnetic field, carry out conversion processing, receive the effect of Lorentz power during ionic current cutting magnetic line in the solution, Lorentz power makes ion do the spiral-line orientation movement; Said externally-applied magnetic field produces by being arranged on the outer magnetic field device of surveying of conversion treatment tank, and said externally-applied magnetic field direction perpendicular to or level in the groundwork face of magnesiumalloy sample.
According to aforesaid method, it is characterized in that: said skimming treatment be greasy dirt thing that Mg alloy surface is existed with acetone 20-40 ℃, UW 5-10 minute cleaning by degreasing.
According to aforesaid method, it is characterized in that: said alkali cleaning is handled and is to use the further degreasing of alkaline wash and cleans because the surperficial residue that stays of acetone, specifically the consisting of of said alkaline wash:
NaOH 10g/L-150g/L，
[0016]?Na
2SiO
3 20g/L-200g/L，
[0017]?Na
3PO
4 15g/L-150g/L，
The processing condition of alkali cleaning are:
Temperature: 40-80 ℃,
Time: 2-15 minute,
PH value: 8-12.
According to aforesaid method, it is characterized in that: said rinsing processing is in room temperature 20-40 ℃ scope, the magnesiumalloy after the alkali cleaning to be carried out rinsing.
According to aforesaid method, it is characterized in that: it is in 25 ℃ of baking ovens, to continue 15min that said oven dry is handled.
According to aforesaid method, it is characterized in that: the treatment solution composition that uses during said Chrome-free chemical conversion is handled is:
K
3VO
4：15g/L-50g/L，
MnCO
3：6g/L-20g/L，
Promotor: NaClO
40.5g/L-10g/L,
Membrane-forming agent: CaCO
34g/L-40g/L;
The treatment solution processing parameter is:
Treatment time: 5-25 minute,
Treatment temp: 30-70 ℃;
Magnetic induction density: 0.1-2 tesla.
According to aforesaid method, it is characterized in that: said field direction is perpendicular to the groundwork face of magnesiumalloy sample.
According to aforesaid method, it is characterized in that: said field direction is parallel to the groundwork face of magnesiumalloy sample.
Fig. 1 is the employed apparatus structure synoptic diagram of method of the present invention;
Fig. 2-5 is respectively the scintigram of the conversion film of experiment 1-4 generation;
Fig. 6 is the polarization curve of magnesiumalloy conversion film in 5%NaCl solution under the different condition.
Referring to Fig. 1, the device of preparation conversion wear-resistance film layer on magnesium alloy surface comprises conversion treatment tank 3, thermopair 5, electric heater 6 and temperature regulator 7.Thermopair 5 is electrically connected with temperature regulator 7 respectively with electric heater 6, and electric heater 6 is arranged in conversion treatment tank 3 with thermopair 5, and temperature regulator 7 is lowered the temperature according to temperature control electric heater 6 intensifications that thermopair 5 records.Be provided with the magnetic field device that produces magnetic field in the outside of conversion treatment tank 3, magnetic field device is made up of iron core 1 and coil 2, and iron core 1 is looped around around the conversion treatment tank with coil 2, and height is suitable with conversion treatment tank 3, and iron core 1 is in the outside of coil 2.After inserting direct current, the direction in magnetic field is disposed and conversion treatment tank 3.
The externally-applied magnetic field effect chemical conversion process of preparation magnesium alloy chromium-free chemical conversion film adopts following measure:
1. pre-treating technology
Magnesiumalloy must carry out pre-treatment before the action of a magnetic field chemical conversion is handled, the pre-treatment procedure relation is to the homogeneity that transforms rete, performances such as bonding force and compactness.In the pre-treatment process, to reach pollutents such as removing the Mg alloy surface grease, for the chemical conversion process under the follow-up the action of a magnetic field is prepared.The pre-treatment process is:
(1) skimming treatment: to Mg alloy surface exist the greasy dirt thing with acetone 20-40 ℃, UW 5-10 minute cleaning by degreasing, with prevent the insufficient and chemical conversion of surface cleaning handle accomplish insufficient.
(2) alkali cleaning is handled: adopt further degreasing of alkali cleaning and because the surperficial residue that stays of acetone.Specifically consisting of of alkaline wash:
NaOH 10g/L-150g/L
Na
2SiO
3 20g/L-200g/L
Na
3PO
4 15g/L-150g/L
The processing condition of alkali cleaning are:
Temperature: 40-80 ℃,
Time: 2-15 minute,
PH value: 8-12 carries out rinsing to the magnesiumalloy after the alkali cleaning in room temperature 20-40 ℃ scope.
(3) oven dry continues 15min. in 25 ℃ of baking ovens
2. the Chrome-free chemical conversion is handled
Magnesiumalloy is immersed in the Chrome-free chemical pretreatment solution, under the effect of externally-applied magnetic field, carry out conversion processing.Used magnetic field is uniform magnetic field.
(1) conversion fluid prescription and treatment process
Solution formula is:
K
3VO
4：15g/L-50g/L，
MnCO
3：6g/L-20g/L，
Promotor: NaClO
40.5g/L-10g/L,
Membrane-forming agent: CaCO
34g/L-40g/L
The treatment solution processing parameter is:
Treatment time: 5-25 minute
Treatment temp: 30-70 ℃
Externally-applied magnetic field skill parameter does
Magnetic induction density: 0.1-2 tesla
Magnetic field is one of effective means that influences electrochemical kinetics.The hydromagnetics effect acts near diffusion layer and the viscous layer the electrode, can strengthen the ion mass transfer of electrode, changes the ionic velocity field.
Under the condition of externally-applied magnetic field, the hydromagnetics effect that Lorentz power causes has influenced electrochemical process significantly.Can receive the effect of Lorentz power during ionic current cutting magnetic line in the solution; Lorentz power makes ion do the spiral-line orientation movement, thereby has played the stirring action of treatment solution, and makes ion do directed accelerated motion.Therefore, externally-applied magnetic field has adjustable ion transport process in the electrochemical process.
A lot of ions are arranged in the treatment solution, and they all have positive and negative electric charge, and in the absence of external force, these particles are rambling to move in solution, does not have rule.But under the effect of externally-applied magnetic field, because the effect of magneticstrength produces lorentz's force, the diffusion of particle has been quickened in the motion of accelerated band point particle, has increased the mobile of particle between the interface, has promptly quickened the carrying out of film formation reaction.And the particle that quickens carries out the mode of motion of systematicness, thereby makes rete fine and close more, and the corrosion resistance nature that generates rete is better.In addition, the present invention has adopted new treatment solution combination: K
3VO
4And MnCO
3Treatment solution is little to the harm of environment and HUMAN HEALTH.
Be 4 embodiment below, be directed against the technology of film-forming process, use treatment solution of the present invention and the vertical magnetic field and the horizontal magnetic field of traditional film-forming process, use treatment solution of the present invention respectively.
Embodiment 1:
To Mg alloy surface exist the greasy dirt thing with acetone 25 ℃, ultrasonic cleaning 6 minutes, adopt the further degreasing of alkali cleaning and because the surperficial residue that stays of acetone, alkaline wash is NaOH:20g/L, Na
2SiO
3: 35g/L, Na
3PO
4: 20g/L; Temperature is 45 ℃, and 6 minutes time, the pH value is 9, and 30 ℃ of room temperatures further after the alkali cleaning, continue 15min in 25 ℃ of baking ovens.To the treatment solution for preparing in conversion tank energising heating, reach preset temperature after, insert sample.
Prescription of treating liquid: Na
2Cr
2O
7: 200g/L; HNO
3: 180g/L; KF:16g/L,
The treatment solution processing parameter is:
Treatment time is 1min,
Treatment temp is at 20 ℃.
Embodiment 2:
To Mg alloy surface exist the greasy dirt thing with acetone 25 ℃, ultrasonic cleaning 6 minutes, adopt the further degreasing of alkali cleaning and because the surperficial residue that stays of acetone, alkaline wash is NaOH:20g/L, Na
2SiO
3: 35g/L, Na
3PO
4: 20g/L; Temperature is 45 ℃, and 6 minutes time, the pH value is 9, and 30 ℃ of room temperatures further after the alkali cleaning, continue 15min in 25 ℃ of baking ovens.To the treatment solution for preparing in conversion tank energising heating, reach preset temperature after, insert sample.
Solution formula is:
K
3VO
4：25g/L
MnCO
3：16g/L，
Promotor: NaClO
4: 4g/L,
Membrane-forming agent: CaCO
3: 20g/L
The treatment solution processing parameter is:
Treatment time: 15 minutes,
Treatment temp: 60 ℃.
Embodiment 3:
To Mg alloy surface exist the greasy dirt thing with acetone 25 ℃, ultrasonic cleaning 6 minutes, adopt the further degreasing of alkali cleaning and because the surperficial residue that stays of acetone, alkaline wash is NaOH:20g/L, Na
2SiO
3: 35g/L, Na
3PO
4: 20g/L; Temperature is 45 ℃, and 6 minutes time, the pH value is 9, and 30 ℃ of room temperatures further after the alkali cleaning, continue 15min in 25 ℃ of baking ovens.To the treatment solution for preparing in conversion tank energising heating, add magnetic field, reach preset temperature after, insert sample.
Solution formula is:
K
3VO
4：25g/L
MnCO
3：16g/L，
Promotor: NaClO
4: 4g/L,
Membrane-forming agent: CaCO
3: 20g/L
The treatment solution processing parameter is:
Treatment time: 15 minutes,
Treatment temp: 60 ℃
Externally-applied magnetic field skill parameter does
Field direction: perpendicular to magnesiumalloy groundwork face, i.e. the bigger face of area
Magnetic induction density: 0.5 tesla
Embodiment 4:
To Mg alloy surface exist the greasy dirt thing with acetone 25 ℃, ultrasonic cleaning 6 minutes, adopt the further degreasing of alkali cleaning and because the surperficial residue that stays of acetone, alkaline wash is NaOH 20g/L, Na
2SiO
335g/L, Na
3PO
420g/L; Temperature is 45 ℃, and 6 minutes time, the pH value is 9, and 30 ℃ of room temperatures further after the alkali cleaning, continue 15min in 25 ℃ of baking ovens.To the treatment solution for preparing in conversion tank energising heating, add magnetic field, reach preset temperature after, insert sample.
Prescription of treating liquid is:
K
3VO
4：25g/L
MnCO
3：16g/L，
Promotor: NaClO
44g/L,
Membrane-forming agent: CaCO
320g/L
The treatment solution processing parameter is:
Treatment time: 15 minutes,
Treatment temp: 60 ℃
Externally-applied magnetic field skill parameter does
Field direction: level is in magnesiumalloy groundwork face, i.e. the bigger face of area,
Magnetic induction density: 0.5 tesla
Embodiment 5:
To Mg alloy surface exist the greasy dirt thing with acetone 25 ℃, ultrasonic cleaning 6 minutes, adopt the further degreasing of alkali cleaning and because the surperficial residue that stays of acetone, alkaline wash is NaOH:20g/L, Na
2SiO
3: 35g/L, Na
3PO
4: 20g/L; Temperature is 45 ℃, and 6 minutes time, the pH value is 9, and 30 ℃ of room temperatures further after the alkali cleaning, continue 15min in 25 ℃ of baking ovens.To the treatment solution for preparing in conversion tank energising heating, add magnetic field, reach preset temperature after, insert sample.
Solution formula is:
K
3VO
4：15g/L
MnCO
3：6g/L，
Promotor: NaClO
4: 0.5g/L,
Membrane-forming agent: CaCO
3: 4g/L
The treatment solution processing parameter is:
Treatment time: 5 minutes,
Treatment temp: 70 ℃
Externally-applied magnetic field skill parameter does
Field direction: perpendicular to magnesiumalloy groundwork face, i.e. the bigger face of area
Magnetic induction density: 0.1 tesla
Embodiment 6:
To Mg alloy surface exist the greasy dirt thing with acetone 25 ℃, ultrasonic cleaning 6 minutes, adopt the further degreasing of alkali cleaning and because the surperficial residue that stays of acetone, alkaline wash is NaOH 20g/L, Na
2SiO
335g/L, Na
3PO
420g/L; Temperature is 45 ℃, and 6 minutes time, the pH value is 9, and 30 ℃ of room temperatures further after the alkali cleaning, continue 15min in 25 ℃ of baking ovens.To the treatment solution for preparing in conversion tank energising heating, add magnetic field, reach preset temperature after, insert sample.
Prescription of treating liquid is:
K
3VO
4：50g/L
MnCO
3：20g/L，
Promotor: NaClO
410g/L,
Membrane-forming agent: CaCO
340g/L
The treatment solution processing parameter is:
Treatment time: 25 minutes,
Treatment temp: 30 ℃
Externally-applied magnetic field skill parameter does
Field direction: level is in magnesiumalloy groundwork face, i.e. the bigger face of area,
Magnetic induction density: 2 teslas
Embodiment 7:
To Mg alloy surface exist the greasy dirt thing with acetone 25 ℃, ultrasonic cleaning 6 minutes, adopt the further degreasing of alkali cleaning and because the surperficial residue that stays of acetone, alkaline wash is NaOH:20g/L, Na
2SiO
3: 35g/L, Na
3PO
4: 20g/L; Temperature is 45 ℃, and 6 minutes time, the pH value is 9, and 30 ℃ of room temperatures further after the alkali cleaning, continue 15min in 25 ℃ of baking ovens.To the treatment solution for preparing in conversion tank energising heating, add magnetic field, reach preset temperature after, insert sample.
Solution formula is:
K
3VO
4：15g/L
MnCO
3：6g/L，
NaClO
4?10g/L
Membrane-forming agent: CaCO
3: 4g/L
The treatment solution processing parameter is:
Treatment time: 5 minutes,
Treatment temp: 70 ℃
Externally-applied magnetic field skill parameter does
Field direction: perpendicular to magnesiumalloy groundwork face, i.e. the bigger face of area
Magnetic induction density: 0.1 tesla
Embodiment 8:
To Mg alloy surface exist the greasy dirt thing with acetone 25 ℃, ultrasonic cleaning 6 minutes, adopt the further degreasing of alkali cleaning and because the surperficial residue that stays of acetone, alkaline wash is NaOH 20g/L, Na
2SiO
335g/L, Na
3PO
420g/L; Temperature is 45 ℃, and 6 minutes time, the pH value is 9, and 30 ℃ of room temperatures further after the alkali cleaning, continue 15min in 25 ℃ of baking ovens.To the treatment solution for preparing in conversion tank energising heating, add magnetic field, reach preset temperature after, insert sample.
Prescription of treating liquid is:
K
3VO
4：50g/L
MnCO
3：20g/L，
NaClO
4?0.5g/L，
Membrane-forming agent: CaCO
340g/L
The treatment solution processing parameter is:
Treatment time: 25 minutes,
Treatment temp: 30 ℃
Externally-applied magnetic field skill parameter does
Field direction: level is in magnesiumalloy groundwork face, i.e. the bigger face of area,
Magnetic induction density: 2 teslas
In embodiment 5-8; Magnesiumalloy conversion film under the effect in magnetic field demonstrates less crackle and hole, learns that through test the magnesiumalloy conversion film shows the surface features more outstanding than conversion film under other magnetic induction density when magnetic induction density is 0.5 tesla.
The scintigram of the conversion processing film among Fig. 2-5 is corresponding the foregoing description 1-4 respectively.
Can find out that from sem photograph conversion film corrodes evenly under embodiment 1 condition, but crackle (referring to Fig. 1) is arranged; Under embodiment 2 conditions, conversion film crackle and hole be (referring to Fig. 2) comparatively obviously; Under embodiment 3 conditions, flawless in the conversion film, surface compact (referring to Fig. 3); Under embodiment 4 conditions, crackle and hole less (referring to Fig. 4) in the conversion film.
The corrosion potential of polarization curve test and the relation curve of corrosion current can be explained basic law, the announcement metallic corrosion mechanism of metallic corrosion through the analysis and research polarization curve.Fig. 6 is the polarization curve of magnesiumalloy conversion film in 5%NaCl solution under the different condition.Mark 1 is the polarization curve of magnesiumalloy conversion film in 5%NaCl solution under embodiment 1 condition; Mark the polarization curve of magnesiumalloy conversion film in 5%NaCl solution under 2 embodiment, 2 conditions; Mark 3 is magnesiumalloy conversion film polarization curves in 5%NaCl solution under embodiment 4 conditions; Mark 4 is magnesiumalloy conversion film polarization curves in 5%NaCl solution under embodiment 3 conditions.
Draw corrosion potential and the corrosion current of magnesiumalloy in corrosion process under the different condition through analyzing polarization curve, as shown in table 1.From table, can find out that the corrosion potential of 3 times magnesiumalloy of embodiment is the highest, corrosion current is minimum, so corrosion resisting property is best.
Draw corrosion potential and the corrosion current of magnesiumalloy in corrosion process under the different condition through analyzing polarization curve, as shown in table 1.From table, can find out that the corrosion potential of 3 times magnesiumalloy of embodiment is the highest, corrosion current is minimum, so corrosion resisting property is best.
[0169] table 1
Claims (6)
1. method for preparing conversion wear-resistance film layer on magnesium alloy surface, the step of this method comprises:
(1) skimming treatment: the grease of removing Mg alloy surface;
(2) alkali cleaning is handled: the residue that adopts further degreasing of alkali cleaning and said skimming treatment to stay;
(3) rinsing processing: the magnesiumalloy to after the alkali cleaning processing carries out rinsing;
(3) oven dry is handled: with said magnesiumalloy oven dry;
(4) the Chrome-free chemical conversion is handled: magnesiumalloy is immersed film forming in the Chrome-free chemical pretreatment solution;
It is characterized in that; When said Chrome-free chemical conversion is handled; Under the effect of externally-applied magnetic field, carry out conversion processing, receive the effect of Lorentz power during ionic current cutting magnetic line in the solution, Lorentz power makes ion do the spiral-line orientation movement; Said externally-applied magnetic field produces by being arranged on the outer magnetic field device of surveying of conversion treatment tank, and said externally-applied magnetic field direction perpendicular to or level in the groundwork face of magnesiumalloy sample.
2. method according to claim 1 is characterized in that: said skimming treatment be greasy dirt thing that Mg alloy surface is existed with acetone 20-40 ℃, UW 5-10 minute cleaning by degreasing.
3. method according to claim 2 is characterized in that: said alkali cleaning is handled and is to use the further degreasing of alkaline wash and cleans because the surperficial residue that stays of acetone, specifically the consisting of of said alkaline wash:
NaOH 10g/L-150g/L，
Na
2SiO
3 20g/L-200g/L，
Na
3PO
4 15g/L-150g/L，
The processing condition of alkali cleaning are:
Temperature: 40-80 ℃,
Time: 2-15 minute,
PH value: 8-12.
4. method according to claim 1 is characterized in that: said rinsing processing is in room temperature 20-40 ℃ scope, the magnesiumalloy after the alkali cleaning to be carried out rinsing.
5. method according to claim 1 is characterized in that: it is in 25 ℃ of baking ovens, to continue 15min that said oven dry is handled.
6. method according to claim 1 is characterized in that: the treatment solution composition that uses during said Chrome-free chemical conversion is handled is:
K
3VO
4：15g/L-50g/L，
MnCO
3：6g/L-20g/L，
Promotor: NaClO
40.5g/L-10g/L,
Membrane-forming agent: CaCO
34g/L-40g/L;
The treatment solution processing parameter is:
Treatment time: 5-25 minute,
Treatment temp: 30-70 ℃;
Magnetic induction density: 0.1-2 tesla.
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| CN2010102171444A CN101886258B (en) | 2010-07-01 | 2010-07-01 | Method for preparing magnesium alloy surface conversion corrosion-resistant film layer |
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| CN101886258A CN101886258A (en) | 2010-11-17 |
| CN101886258B true CN101886258B (en) | 2012-01-18 |
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| CN102899656A (en) * | 2012-08-31 | 2013-01-30 | 北方工业大学 | Preparation method of nano alumina particle reinforced conversion film |
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| CN103774133B (en) * | 2014-02-25 | 2016-08-17 | 无锡铱美特科技有限公司 | The without phosphorus chromium-free fluorine-free of Mg alloy surface converts film forming liquid and using method thereof |
| CN104357832B (en) * | 2014-10-17 | 2017-05-17 | 哈尔滨工程大学 | Method for preparing conversion film on surface of magnesium alloy and composite material with conversion film |
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| CN1165872A (en) * | 1996-05-17 | 1997-11-26 | 刘武青 | Magnetic plating appts. |
| CN100532642C (en) * | 2005-06-13 | 2009-08-26 | 比亚迪股份有限公司 | Process for preparing magnesium alloy chemical conversion coating |
| TWI312151B (en) * | 2005-06-14 | 2009-07-11 | Chang Ching Ra | Tunable magnetic recording medium and its fabricating method |
| CN101538707B (en) * | 2009-03-13 | 2011-05-04 | 上海大学 | Treatment method on surface of magnesium alloy |
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| CN102899656A (en) * | 2012-08-31 | 2013-01-30 | 北方工业大学 | Preparation method of nano alumina particle reinforced conversion film |
| CN102899656B (en) * | 2012-08-31 | 2014-07-30 | 北方工业大学 | Preparation method of nano alumina particle reinforced conversion film |
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