CN104805488A - Method for enhancing threaded surface of magnesium alloy embedded part - Google Patents
Method for enhancing threaded surface of magnesium alloy embedded part Download PDFInfo
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- CN104805488A CN104805488A CN201510259730.8A CN201510259730A CN104805488A CN 104805488 A CN104805488 A CN 104805488A CN 201510259730 A CN201510259730 A CN 201510259730A CN 104805488 A CN104805488 A CN 104805488A
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/30—Anodisation of magnesium or alloys based thereon
Abstract
The invention discloses a method for enhancing the threaded surface of a magnesium alloy embedded part, relates to a method for enhancing threaded surface of the embedded part, and aims to solve the problem of non-uniform surface film formation due to the local discharge phenomenon inside a thread under the influence of non-uniform electric field distribution in the conventional magnesium alloy thread. The method comprises the following steps: I, performing mechanical pretreatment on the surface of the alloy embedded part; II, performing ultrasonic treatment; III, removing oil; IV, performing micro-arc oxidization to finish enhancement of the threaded surface of the magnesium alloy embedded part. Tightening torque of 4.0N.M is implemented to the magnesium alloy embedded part subjected to surface enhancement, and a micro-arc oxidization film layer does not fall off after repeated loading and unloading of 20 times; an extension force test is implemented on the internal threads of the magnesium alloy embedded part subjected to surface enhancement with the method, extension force is up to 8,000N-12,000N; the requirements on an aerospace magnesium alloy material are met. By adopting the method, the threaded surface of the magnesium alloy embedded part can be enhanced.
Description
Technical field
The present invention relates to the method for a kind of embedded part thread surface strengthening.
Background technology
Along with the continuous progress of science and technology, spacecraft is also thereupon to heavy type, multi-functional and high stable integrative development, to a certain extent, the useful load of spacecraft, precision and susceptibility are improving constantly, and have higher requirement to space flight material therefor, as light weight, high effect and the performance such as multi-functional.Aluminium, magnesium and alloy thereof belong to light-weight metal, there is low density, high strength, the feature such as workability and good toughness, and be the valve metal material that can improve through sufacing, be widely used in the structure material material of spacecraft, if spacecraft annex is (as solar wing, antenna), spacecraft load bearing structure part is (as joint, support etc.) and seal casinghousing structure etc., along with the incremental advances of aerospace industry, deep space is turned to gradually by near-earth, proceed to the running of long-time space, the structure material material of spacecraft is had higher requirement, as light weight, high strength, anti-steric effect, the performance such as wear-and corrosion-resistant and high stability, do not lose both effectiveness in order to further weight reduction, improve structure efficiency, in the urgent need to the better structure material of performance.
High strength, low density material are the first-selections of Design of spacecraft structure theory, are used as with this benchmark improving spacecraft structure benefit.Magnesium alloy has the little (1.82g/cm of density
3), advantage that specific tenacity is high; Magnesium and alloy embedded part thereof are widely used in the web member in spacecraft structure, to meet the light-weighted requirement of spacecraft.But in storage, equipment and operation, easily produce the problems such as abrasion and corrosion, make the mutual cohesive force of structural part poor, thread looseness, cause spacecraft reliability to decline.Therefore, the erosion resistance, the embedded part screw thread reinforcement performance that improve magnesium and alloy thereof are particularly important.
Summary of the invention
The object of the invention is will solve existing magnesium alloy screw thread because of electric field distribution inequality, by the impact of electric field distribution inequality, easily there is partial discharge phenomenon in threaded interior, causes the problem of surface filming inequality, and provide a kind of method that magnesium alloy embedded part thread surface is strengthened.
A method for magnesium alloy embedded part thread surface strengthening, completes according to the following steps:
One, magnesium alloy embedded part surface mechanical pretreatment: use 120#SiC sand paper, 1000#SiC sand paper and 2000#SiC sand paper to carry out grinding process to magnesium alloy embedded part surface successively, the threaded interior of magnesium alloy embedded part uses threaded plug gauge to polish, and obtains the magnesium alloy embedded part of surface-brightening;
Two, supersound process: use the magnesium alloy embedded part of dehydrated alcohol effects on surface light to clean 3 times ~ 5 times, again the magnesium alloy embedded part after ethanol purge is immersed in acetone, supersound process 10min ~ 15min under ultrasonic power is 200 ~ 300W again, obtains the magnesium alloy embedded part after acetone cleaning;
Three, oil removing: the magnesium alloy embedded part after being cleaned by acetone is immersed in degreaser solution, in temperature for process 15min ~ 20min at 50 DEG C ~ 80 DEG C, re-use distilled water and carry out flushing 5 times ~ 10 times, dry 1min ~ 2min at temperature is 20 DEG C ~ 30 DEG C, obtains the magnesium alloy embedded part after oil removing again;
Degreaser described in step 3 is made up of potassium hydroxide solution and sodium radio-phosphate,P-32 solution; In described degreaser, the concentration of potassium hydroxide is 40g/L ~ 60g/L, and the concentration of sodium radio-phosphate,P-32 solution is 5g/L ~ 20g/L;
Four, differential arc oxidation: put into by the magnesium alloy embedded part after oil removing and be equipped with in the stainless steel electrolytic groove of electrolytic solution, the magnesium alloy embedded part after oil removing is connected with the positive pole of power supply, and as anode, stainless electrolyzer is connected with the negative pole of power supply, as negative electrode; Adopting pulse mao power source to power, is 0.5A/dm in current density
2~ 1.2A/dm
2, dutycycle be 10% ~ 40% and supply frequency be differential arc oxidation 6min ~ 10min under 500Hz ~ 2000Hz, namely complete magnesium alloy embedded part thread surface strengthening method;
Electrolytic solution described in step 4 is made up of water glass, potassium hydroxide, Sodium Fluoride, glycerol and ethylene glycol, and solvent is water; The concentration of described electrolytic solution mesosilicic acid sodium is 15g/L ~ 40g/L, and the concentration of potassium hydroxide is 3g/L ~ 7g/L, and the concentration of Sodium Fluoride is 1g/L ~ 6g/L, and the concentration of glycerol is 10mL/L ~ 300mL/L, and the concentration of ethylene glycol is 10mL/L ~ 100mL/L.
Advantage of the present invention:
One, after using the method for magnesium alloy embedded part thread surface strengthening in the present invention one, the differential arc oxidation film layer of dense uniform is obtained at magnesium alloy embedded part screw thread and surface; Magnesium alloy embedded part thread surface strengthening after in the dilute nitric acid solution of 0.1mol/L without bubbling corrosion phenomenon, prove that rete does not have micropore; In the neutral salt spray test of 3.5% salt solution, inoxidized magnesium alloy just there occurs corrosion in one hour, and used the magnesium alloy after the inventive method process within 96 hours in salt-fog test, not corrode;
Two, 4.0N is implemented to the magnesium alloy embedded part used after the inventive method surface strengthening
.m screwing force distance, repeatedly loads and unloads 20 differential arc oxidation film layers and does not come off; Complete the magnesium alloy embedded part internal thread after surface strengthening to use method of the present invention and implement pull-off test, pulling-out force reaches 8,000 newton ~ 12,000 newton; Meet the requirement of space flight magnesium alloy materials.
The present invention can obtain the method for a kind of magnesium alloy embedded part thread surface strengthening.
Accompanying drawing explanation
Fig. 1 is the SEM figure of the magnesium alloy embedded part thread surface after the process obtained in simultaneous test;
Fig. 2 is the SEM figure of magnesium alloy embedded part thread surface after the method for magnesium alloy embedded part thread surface strengthening that completes obtained in embodiment one;
Fig. 3 is the digital photograph figure of the magnesium alloy embedded part after the process obtained in simultaneous test, and in Fig. 3,1 is magnesium alloy embedded part, and 2 is Micro-Arc Oxidized Ceramic Coating, 3 ablation depositions for causing because electric field distribution is uneven in micro-arc oxidation process;
Fig. 4 is the digital photograph figure of magnesium alloy embedded part after the method for magnesium alloy embedded part thread surface strengthening that completes obtained in embodiment one, and in Fig. 4,1 is magnesium alloy embedded part, and 2 is Micro-Arc Oxidized Ceramic Coating.
Embodiment
Embodiment one: present embodiment is that the method for a kind of magnesium alloy embedded part thread surface strengthening completes according to the following steps:
One, magnesium alloy embedded part surface mechanical pretreatment: use 120#SiC sand paper, 1000#SiC sand paper and 2000#SiC sand paper to carry out grinding process to magnesium alloy embedded part surface successively, the threaded interior of magnesium alloy embedded part uses threaded plug gauge to polish, and obtains the magnesium alloy embedded part of surface-brightening;
Two, supersound process: use the magnesium alloy embedded part of dehydrated alcohol effects on surface light to clean 3 times ~ 5 times, again the magnesium alloy embedded part after ethanol purge is immersed in acetone, supersound process 10min ~ 15min under ultrasonic power is 200 ~ 300W again, obtains the magnesium alloy embedded part after acetone cleaning;
Three, oil removing: the magnesium alloy embedded part after being cleaned by acetone is immersed in degreaser solution, in temperature for process 15min ~ 20min at 50 DEG C ~ 80 DEG C, re-use distilled water and carry out flushing 5 times ~ 10 times, dry 1min ~ 2min at temperature is 20 DEG C ~ 30 DEG C, obtains the magnesium alloy embedded part after oil removing again;
Degreaser described in step 3 is made up of potassium hydroxide solution and sodium radio-phosphate,P-32 solution; In described degreaser, the concentration of potassium hydroxide is 40g/L ~ 60g/L, and the concentration of sodium radio-phosphate,P-32 solution is 5g/L ~ 20g/L;
Four, differential arc oxidation: put into by the magnesium alloy embedded part after oil removing and be equipped with in the stainless steel electrolytic groove of electrolytic solution, the magnesium alloy embedded part after oil removing is connected with the positive pole of power supply, and as anode, stainless electrolyzer is connected with the negative pole of power supply, as negative electrode; Adopting pulse mao power source to power, is 0.5A/dm in current density
2~ 1.2A/dm
2, dutycycle be 10% ~ 40% and supply frequency be differential arc oxidation 6min ~ 10min under 500Hz ~ 2000Hz, namely complete magnesium alloy embedded part thread surface strengthening method;
Electrolytic solution described in step 4 is made up of water glass, potassium hydroxide, Sodium Fluoride, glycerol and ethylene glycol, and solvent is water; The concentration of described electrolytic solution mesosilicic acid sodium is 15g/L ~ 40g/L, and the concentration of potassium hydroxide is 3g/L ~ 7g/L, and the concentration of Sodium Fluoride is 1g/L ~ 6g/L, and the concentration of glycerol is 10mL/L ~ 300mL/L, and the concentration of ethylene glycol is 10mL/L ~ 100mL/L.
The advantage of present embodiment:
One, after using the method for magnesium alloy embedded part thread surface strengthening in present embodiment one, the differential arc oxidation film layer of dense uniform is obtained at magnesium alloy embedded part screw thread and surface; Magnesium alloy embedded part thread surface strengthening after in the dilute nitric acid solution of 0.1mol/L without bubbling corrosion phenomenon, prove that rete does not have micropore; In the neutral salt spray test of 3.5% salt solution, inoxidized magnesium alloy just there occurs corrosion in one hour, and used the magnesium alloy after the process of present embodiment method within 96 hours in salt-fog test, not corrode;
Two, to using the magnesium alloy embedded part enforcement 4.0N after present embodiment method table surface strengthening
.m screwing force distance, repeatedly loads and unloads 20 differential arc oxidation film layers and does not come off; Complete the magnesium alloy embedded part internal thread after surface strengthening to using the method for present embodiment and implement pull-off test, pulling-out force reaches 8,000 newton ~ 12,000 newton; Meet the requirement of space flight magnesium alloy materials.
Present embodiment can obtain the method for a kind of magnesium alloy embedded part thread surface strengthening.
Embodiment two: the difference of present embodiment and embodiment one is: the magnesium alloy embedded part after being cleaned by acetone in step 3 is immersed in degreaser solution, in temperature for process 20min at 60 DEG C ~ 70 DEG C, re-use distilled water and carry out flushing 8 times ~ 10 times, dry 2min at temperature is 25 DEG C ~ 30 DEG C, obtains the magnesium alloy embedded part after oil removing again.Other are identical with embodiment one.
Embodiment three: the difference of present embodiment and embodiment one or two is: the degreaser described in step 3 is made up of potassium hydroxide solution and sodium radio-phosphate,P-32 solution; In described degreaser, the concentration of potassium hydroxide is 40g/L ~ 50g/L, and the concentration of sodium radio-phosphate,P-32 solution is 5g/L ~ 10g/L.Other are identical with embodiment one or two.
Embodiment four: the difference of present embodiment and embodiment one to three is: the degreaser described in step 3 is made up of potassium hydroxide solution and sodium radio-phosphate,P-32 solution; In described degreaser, the concentration of potassium hydroxide is 50g/L ~ 60g/L, and the concentration of sodium radio-phosphate,P-32 solution is 15g/L ~ 20g/L.Other are identical with embodiment one to three.
Embodiment five: the difference of present embodiment and embodiment one to four is: adopt pulse mao power source to power in step 4 is 0.7A/dm in current density
2, dutycycle be 10% and supply frequency be differential arc oxidation 8min under 1000Hz, namely complete magnesium alloy embedded part thread surface strengthening method.Other are identical with embodiment one to four.
Embodiment six: the difference of present embodiment and embodiment one to five is: adopt pulse mao power source to power in step 4 is 0.8A/dm in current density
2~ 1.2A/dm
2, dutycycle be 30% ~ 40% and supply frequency be differential arc oxidation 8min ~ 10min under 1000Hz ~ 2000Hz, namely complete magnesium alloy embedded part thread surface strengthening method.Other are identical with embodiment one to five.
Embodiment seven: the difference of present embodiment and embodiment one to six is: the electrolytic solution described in step 4 is made up of water glass, potassium hydroxide, Sodium Fluoride, glycerol and ethylene glycol, solvent is water; The concentration of described electrolytic solution mesosilicic acid sodium is 15g/L ~ 30g/L, and the concentration of potassium hydroxide is 3g/L ~ 5g/L, and the concentration of Sodium Fluoride is 1g/L ~ 3g/L, and the concentration of glycerol is 10mL/L ~ 100mL/L, and the concentration of ethylene glycol is 10mL/L ~ 50mL/L.Other are identical with embodiment one to six.
Embodiment eight: the difference of present embodiment and embodiment one to seven is: the electrolytic solution described in step 4 is made up of water glass, potassium hydroxide, Sodium Fluoride, glycerol and ethylene glycol, solvent is water; The concentration of described electrolytic solution mesosilicic acid sodium is 30g/L ~ 40g/L, and the concentration of potassium hydroxide is 5g/L ~ 7g/L, and the concentration of Sodium Fluoride is 3g/L ~ 6g/L, and the concentration of glycerol is 100mL/L ~ 300mL/L, and the concentration of ethylene glycol is 50mL/L ~ 100mL/L.Other are identical with embodiment one to seven.
Embodiment nine: the difference of present embodiment and embodiment one to eight is: the electrolytic solution described in step 4 is made up of water glass, potassium hydroxide, Sodium Fluoride, glycerol and ethylene glycol, solvent is water; The concentration of described electrolytic solution mesosilicic acid sodium is 25g/L, and the concentration of potassium hydroxide is 5g/L, and the concentration of Sodium Fluoride is 2g/L, and the concentration of glycerol is 100mL/L, and the concentration of ethylene glycol is 50mL/L.Other are identical with embodiment one to eight.
Embodiment ten: the difference of present embodiment and embodiment one to nine is: the electrolytic solution described in step 4 is made up of water glass, potassium hydroxide, Sodium Fluoride, glycerol and ethylene glycol, solvent is water; The concentration of described electrolytic solution mesosilicic acid sodium is 30g/L ~ 40g/L, and the concentration of potassium hydroxide is 4g/L ~ 6g/L, and the concentration of Sodium Fluoride is 3g/L ~ 5g/L, and the concentration of glycerol is 200mL/L ~ 300mL/L, and the concentration of ethylene glycol is 80mL/L ~ 100mL/L.Other are identical with embodiment one to nine.
Adopt following verification experimental verification beneficial effect of the present invention:
Adopt following verification experimental verification beneficial effect of the present invention:
Simultaneous test: a kind of method of magnesium alloy embedded part thread surface strengthening, completes according to the following steps:
One, magnesium alloy embedded part surface mechanical pretreatment: use 120#SiC sand paper, 1000#SiC sand paper and 2000#SiC sand paper to carry out grinding process to magnesium alloy embedded part surface successively, the threaded interior of magnesium alloy embedded part uses threaded plug gauge to polish, and obtains the magnesium alloy embedded part of surface-brightening;
Two, supersound process: use the magnesium alloy embedded part of dehydrated alcohol effects on surface light to clean 5 times, then the magnesium alloy embedded part after ethanol purge is immersed in acetone, supersound process 15min under ultrasonic power is 220W, obtain the magnesium alloy embedded part after acetone cleaning;
Three, oil removing: by acetone clean after magnesium alloy embedded part be immersed in degreaser solution, in temperature for process 20min at 50 DEG C, re-use distilled water and carry out flushing 5 times, then at temperature is 20 DEG C dry 1min, obtain the magnesium alloy embedded part after oil removing;
Degreaser described in step 3 is made up of potassium hydroxide solution and sodium radio-phosphate,P-32 solution; In described degreaser, the concentration of potassium hydroxide is 60g/L, and the concentration of sodium radio-phosphate,P-32 solution is 15g/L;
Four, differential arc oxidation: the magnesium alloy embedded part after oil removing is equipped with in the stainless steel electrolytic groove of electrolytic solution, the magnesium alloy embedded part after oil removing is connected with the positive pole of power supply, and as anode, stainless electrolyzer is connected with the negative pole of power supply, as negative electrode; Adopting pulse mao power source to power, is 0.7A/dm in current density
2, dutycycle be 10% and supply frequency be differential arc oxidation 8min under 1000Hz, obtain process after magnesium alloy embedded part;
Electrolytic solution described in step 4 is made up of water glass, potassium hydroxide and Sodium Fluoride, and solvent is water; The concentration of described electrolytic solution mesosilicic acid sodium is 25g/L, and the concentration of potassium hydroxide is 5g/L, and the concentration of Sodium Fluoride is 2g/L.
Embodiment one: a kind of method of magnesium alloy embedded part thread surface strengthening, completes according to the following steps:
One, magnesium alloy embedded part surface mechanical pretreatment: use 120#SiC sand paper, 1000#SiC sand paper and 2000#SiC sand paper to carry out grinding process to magnesium alloy embedded part surface successively, the threaded interior of magnesium alloy embedded part uses threaded plug gauge to polish, and obtains the magnesium alloy embedded part of surface-brightening;
Two, supersound process: use the magnesium alloy embedded part of dehydrated alcohol effects on surface light to clean 5 times, then the magnesium alloy embedded part after ethanol purge is immersed in acetone, then under ultrasonic power is 220W supersound process 15min, obtain the magnesium alloy embedded part after acetone cleaning;
Three, oil removing: by acetone clean after magnesium alloy embedded part be immersed in degreaser solution, in temperature for process 20min at 50 DEG C, re-use distilled water and carry out flushing 5 times, then at temperature is 20 DEG C dry 1min, obtain the magnesium alloy embedded part after oil removing;
Degreaser described in step 3 is made up of potassium hydroxide solution and sodium radio-phosphate,P-32 solution; In described degreaser, the concentration of potassium hydroxide is 60g/L, and the concentration of sodium radio-phosphate,P-32 solution is 15g/L;
Four, differential arc oxidation: put into by the magnesium alloy embedded part after oil removing and be equipped with in the stainless steel electrolytic groove of electrolytic solution, the magnesium alloy embedded part after oil removing is connected with the positive pole of power supply, and as anode, stainless electrolyzer is connected with the negative pole of power supply, as negative electrode; Adopting pulse mao power source to power, is 0.7A/dm in current density
2, dutycycle be 10% and supply frequency be differential arc oxidation 8min under 1000Hz, namely complete magnesium alloy embedded part thread surface strengthening method;
Electrolytic solution described in step 4 is made up of water glass, potassium hydroxide, Sodium Fluoride, glycerol and ethylene glycol, and solvent is water; The concentration of described electrolytic solution mesosilicic acid sodium is 25g/L, and the concentration of potassium hydroxide is 5g/L, and the concentration of Sodium Fluoride is 2g/L, and the concentration of glycerol is 100mL/L, and the concentration of ethylene glycol is 50mL/L.
Fig. 1 is the SEM figure of the magnesium alloy embedded part thread surface after the process obtained in simultaneous test; Fig. 2 is the SEM figure of magnesium alloy embedded part thread surface after the method for magnesium alloy embedded part thread surface strengthening that completes obtained in embodiment one;
As can be seen from Fig. 1 and Fig. 2, after with the addition of glycerol and ethylene glycol in embodiment one in electrolytic solution, larger impact is produced on differential arc oxidation film layer surface, differential arc oxidation film layer alligatoring quantity significantly reduces, and is conducive to the raising of differential arc oxidation film layer corrosion resistance nature; In pull-off test process, be conducive to differential arc oxidation film layer fastening, make differential arc oxidation film layer difficult drop-off.
Fig. 3 is the digital photograph figure of the magnesium alloy embedded part after the process obtained in simultaneous test, and in Fig. 3,1 is magnesium alloy embedded part, and 2 is Micro-Arc Oxidized Ceramic Coating, 3 ablation depositions for causing because electric field distribution is uneven in micro-arc oxidation process;
Fig. 4 is the digital photograph figure of magnesium alloy embedded part after the method for magnesium alloy embedded part thread surface strengthening that completes obtained in embodiment one, and in Fig. 4,1 is magnesium alloy embedded part, and 2 is Micro-Arc Oxidized Ceramic Coating;
From Fig. 3 and Fig. 4, after the method for magnesium alloy embedded part thread surface strengthening that completes obtained in embodiment one, the differential arc oxidation film layer on magnesium alloy embedded part surface is more even than the differential arc oxidation film layer on the magnesium alloy embedded part surface after the process obtained in simultaneous test, this is because thread surface is uneven, electric field distribution is uneven, in micro-arc oxidation process, easily there is shelf depreciation and form Partial ablation, in strong discharge process, produce a large amount of oxygen bubble, blocking tapped bore, hinder entering of electrolytic solution, cause the magnesium alloy embedded part bottom of thread can not change fresh electrolyte in time, in order to realize discharge process, the increase of sparking voltage, guiding discharge energy sharply strengthens, and puncture explosion sound and strengthen, ablation deposition appears in the magnesium alloy embedded part bottom of thread, and disadvantageous effect is played in the growth for differential arc oxidation film layer, embodiment one with the addition of glycerol and ethylene glycol in the electrolytic solution, play suppression shelf depreciation, reduce oxygen generating rate and reduce oxygen bubble volume, bubble is got rid of from magnesium alloy embedded part tapped bore smoothly, electrolytic solution can be changed in time, ensure the smooth enforcement of next time discharging, thus realize differential arc oxidation film layer homoepitaxial.
After using the method for magnesium alloy embedded part thread surface strengthening in embodiment one, obtain the differential arc oxidation film layer of dense uniform at magnesium alloy embedded part screw thread and surface; Magnesium alloy embedded part thread surface strengthening after in the dilute nitric acid solution of 0.1mol/L without bubbling corrosion phenomenon, prove that rete does not have micropore; In the neutral salt spray test of 3.5% salt solution, inoxidized magnesium alloy just there occurs corrosion in one hour, and the magnesium alloy after the process of use-testing one method can not corrode for 96 hours in salt-fog test;
4.0N is implemented to the magnesium alloy embedded part after using the method table surface strengthening of embodiment one
.m screwing force distance, repeatedly loads and unloads 20 differential arc oxidation film layers and does not come off; Complete the magnesium alloy embedded part internal thread after surface strengthening to using the method for embodiment one and implement pull-off test, pulling-out force reaches 12,000 newton; Meet the requirement of space flight magnesium alloy materials.
Claims (10)
1. a method for magnesium alloy embedded part thread surface strengthening, is characterized in that a kind of method that magnesium alloy embedded part thread surface is strengthened completes according to the following steps:
One, magnesium alloy embedded part surface mechanical pretreatment: use 120#SiC sand paper, 1000#SiC sand paper and 2000#SiC sand paper to carry out grinding process to magnesium alloy embedded part surface successively, the threaded interior of magnesium alloy embedded part uses threaded plug gauge to polish, and obtains the magnesium alloy embedded part of surface-brightening;
Two, supersound process: use the magnesium alloy embedded part of dehydrated alcohol effects on surface light to clean 3 times ~ 5 times, again the magnesium alloy embedded part after ethanol purge is immersed in acetone, supersound process 10min ~ 15min under ultrasonic power is 200 ~ 300W again, obtains the magnesium alloy embedded part after acetone cleaning;
Three, oil removing: the magnesium alloy embedded part after being cleaned by acetone is immersed in degreaser solution, in temperature for process 15min ~ 20min at 50 DEG C ~ 80 DEG C, re-use distilled water and carry out flushing 5 times ~ 10 times, dry 1min ~ 2min at temperature is 20 DEG C ~ 30 DEG C, obtains the magnesium alloy embedded part after oil removing again;
Degreaser described in step 3 is made up of potassium hydroxide solution and sodium radio-phosphate,P-32 solution; In described degreaser, the concentration of potassium hydroxide is 40g/L ~ 60g/L, and the concentration of sodium radio-phosphate,P-32 solution is 5g/L ~ 20g/L;
Four, differential arc oxidation: put into by the magnesium alloy embedded part after oil removing and be equipped with in the stainless steel electrolytic groove of electrolytic solution, the magnesium alloy embedded part after oil removing is connected with the positive pole of power supply, and as anode, stainless electrolyzer is connected with the negative pole of power supply, as negative electrode; Adopting pulse mao power source to power, is 0.5A/dm in current density
2~ 1.2A/dm
2, dutycycle be 10% ~ 40% and supply frequency be differential arc oxidation 6min ~ 10min under 500Hz ~ 2000Hz, namely complete magnesium alloy embedded part thread surface strengthening method;
Electrolytic solution described in step 4 is made up of water glass, potassium hydroxide, Sodium Fluoride, glycerol and ethylene glycol, and solvent is water; The concentration of described electrolytic solution mesosilicic acid sodium is 15g/L ~ 40g/L, and the concentration of potassium hydroxide is 3g/L ~ 7g/L, and the concentration of Sodium Fluoride is 1g/L ~ 6g/L, and the concentration of glycerol is 10mL/L ~ 300mL/L, and the concentration of ethylene glycol is 10mL/L ~ 100mL/L.
2. the method for a kind of magnesium alloy embedded part thread surface strengthening according to claim 1, it is characterized in that the magnesium alloy embedded part after being cleaned by acetone in step 3 is immersed in degreaser solution, in temperature for process 20min at 60 DEG C ~ 70 DEG C, re-use distilled water and carry out flushing 8 times ~ 10 times, dry 2min at temperature is 25 DEG C ~ 30 DEG C, obtains the magnesium alloy embedded part after oil removing again.
3. the method for a kind of magnesium alloy embedded part thread surface strengthening according to claim 1, is characterized in that the degreaser described in step 3 is made up of potassium hydroxide solution and sodium radio-phosphate,P-32 solution; In described degreaser, the concentration of potassium hydroxide is 40g/L ~ 50g/L, and the concentration of sodium radio-phosphate,P-32 solution is 5g/L ~ 10g/L.
4. the method for a kind of magnesium alloy embedded part thread surface strengthening according to claim 1, is characterized in that the degreaser described in step 3 is made up of potassium hydroxide solution and sodium radio-phosphate,P-32 solution; In described degreaser, the concentration of potassium hydroxide is 50g/L ~ 60g/L, and the concentration of sodium radio-phosphate,P-32 solution is 15g/L ~ 20g/L.
5. the method for a kind of magnesium alloy embedded part thread surface strengthening according to claim 1, it is characterized in that adopting pulse mao power source to power in step 4, is 0.7A/dm in current density
2, dutycycle be 10% and supply frequency be differential arc oxidation 8min under 1000Hz, namely complete magnesium alloy embedded part thread surface strengthening method.
6. the method for a kind of magnesium alloy embedded part thread surface strengthening according to claim 1, it is characterized in that adopting pulse mao power source to power in step 4, is 0.8A/dm in current density
2~ 1.2A/dm
2, dutycycle be 30% ~ 40% and supply frequency be differential arc oxidation 8min ~ 10min under 1000Hz ~ 2000Hz, namely complete magnesium alloy embedded part thread surface strengthening method.
7. the method for a kind of magnesium alloy embedded part thread surface strengthening according to claim 1, it is characterized in that the electrolytic solution described in step 4 is made up of water glass, potassium hydroxide, Sodium Fluoride, glycerol and ethylene glycol, solvent is water; The concentration of described electrolytic solution mesosilicic acid sodium is 15g/L ~ 30g/L, and the concentration of potassium hydroxide is 3g/L ~ 5g/L, and the concentration of Sodium Fluoride is 1g/L ~ 3g/L, and the concentration of glycerol is 10mL/L ~ 100mL/L, and the concentration of ethylene glycol is 10mL/L ~ 50mL/L.
8. the method for a kind of magnesium alloy embedded part thread surface strengthening according to claim 1, it is characterized in that the electrolytic solution described in step 4 is made up of water glass, potassium hydroxide, Sodium Fluoride, glycerol and ethylene glycol, solvent is water; The concentration of described electrolytic solution mesosilicic acid sodium is 30g/L ~ 40g/L, and the concentration of potassium hydroxide is 5g/L ~ 7g/L, and the concentration of Sodium Fluoride is 3g/L ~ 6g/L, and the concentration of glycerol is 100mL/L ~ 300mL/L, and the concentration of ethylene glycol is 50mL/L ~ 100mL/L.
9. the method for a kind of magnesium alloy embedded part thread surface strengthening according to claim 1, it is characterized in that the electrolytic solution described in step 4 is made up of water glass, potassium hydroxide, Sodium Fluoride, glycerol and ethylene glycol, solvent is water; The concentration of described electrolytic solution mesosilicic acid sodium is 25g/L, and the concentration of potassium hydroxide is 5g/L, and the concentration of Sodium Fluoride is 2g/L, and the concentration of glycerol is 100mL/L, and the concentration of ethylene glycol is 50mL/L.
10. the method for a kind of magnesium alloy embedded part thread surface strengthening according to claim 1, it is characterized in that the electrolytic solution described in step 4 is made up of water glass, potassium hydroxide, Sodium Fluoride, glycerol and ethylene glycol, solvent is water; The concentration of described electrolytic solution mesosilicic acid sodium is 30g/L ~ 40g/L, and the concentration of potassium hydroxide is 4g/L ~ 6g/L, and the concentration of Sodium Fluoride is 3g/L ~ 5g/L, and the concentration of glycerol is 200mL/L ~ 300mL/L, and the concentration of ethylene glycol is 80mL/L ~ 100mL/L.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108531962A (en) * | 2018-05-29 | 2018-09-14 | 河南科技大学 | A kind of Mg alloy surface enhancing processing method |
| CN108642544A (en) * | 2018-05-29 | 2018-10-12 | 河南科技大学 | A method of using differential arc oxidation oxidation film is prepared in Mg alloy surface |
| CN112355415A (en) * | 2020-11-10 | 2021-02-12 | 西安赛福斯材料防护有限责任公司 | Manual machining method for precise threads of titanium-based parts |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108531962A (en) * | 2018-05-29 | 2018-09-14 | 河南科技大学 | A kind of Mg alloy surface enhancing processing method |
| CN108642544A (en) * | 2018-05-29 | 2018-10-12 | 河南科技大学 | A method of using differential arc oxidation oxidation film is prepared in Mg alloy surface |
| CN108642544B (en) * | 2018-05-29 | 2020-04-07 | 河南科技大学 | Method for preparing oxide film on surface of magnesium alloy by utilizing micro-arc oxidation |
| CN112355415A (en) * | 2020-11-10 | 2021-02-12 | 西安赛福斯材料防护有限责任公司 | Manual machining method for precise threads of titanium-based parts |
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