CN102330136A - Auxiliary cathode and method for carrying out anodic oxidation on blind hole by using the same - Google Patents
Auxiliary cathode and method for carrying out anodic oxidation on blind hole by using the same Download PDFInfo
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- CN102330136A CN102330136A CN201110261567A CN201110261567A CN102330136A CN 102330136 A CN102330136 A CN 102330136A CN 201110261567 A CN201110261567 A CN 201110261567A CN 201110261567 A CN201110261567 A CN 201110261567A CN 102330136 A CN102330136 A CN 102330136A
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Abstract
The invention discloses an auxiliary cathode and a method for carrying out anodic oxidation on a blind hole by using the same. A main body of the auxiliary cathode is a section of circular tube made of an alloy material; one end of the circular tube is sealed while the other end of the circular tube is provided with a middle hole parallel to the radial direction of the circular tube; a plurality of small holes vertical to the radial direction of the circular tube are uniformly formed on the side wall of the circular tube close to the middle hole; circular ring shaped supporting frames sleeved on the circular tube are mounted on the two sides of the small holes; gaps are formed on the circular ring shaped supporting frames; and a wiring hole is also formed on the circular tube and connected with a lead. Oxidation films can be synchronously generated on the surface of a workpiece and in the blind hole by using the auxiliary cathode to oxidize the blind hole so that the film thickness uniformity is improved, the current efficiency is enhanced and the energy consumption is reduced; moreover, the oxidation operation is controlled to be closed and opened through the disconnection and connection of a conductive clip and a cathode rod in the oxidation process so that the thickness of the oxidation film in the blind hole is adjusted in time.
Description
Technical field
The present invention relates to duraluminum blind hole anode oxidation method, particularly relate to a kind of deep hole anode oxidation method.
Background technology
Aspect some general engineering and war industry; The component of the duraluminum that some is bigger need anodic oxidation, and these component have very dark blind hole sometimes, and not only piece surface needs thicker sull; The sull of these blind holes also will reach certain requirement.Existing solution is through adjustment clamping workpiece direction, on technology, improves oxidation voltage and prolongs oxidization time, makes the thickness that reaches certain in the blind hole.
There is following weak point in above-mentioned existing solution:
1, to some bigger workpiece, adjustment clamping direction ratio is difficulty, can not well solve the uniform film thickness problem, and thickness differs greatly in surface and the hole, for the film thickness in the hole reaches requirement, and improves oxidation voltage and prolongs oxidization time, causes energy dissipation;
2, the inaccuracy of dimensions that causes other position, this phenomenon are especially obvious in the hardening oxidation process.
Summary of the invention
The object of the invention is to overcome the deficiency of above-mentioned prior art, and the auxiliary cathode of a kind of flexible and convenient operation, oxidation film layer ideal thickness is provided, and utilizes this auxiliary cathode that blind hole is carried out anodised method.Technical solution of the present invention is following:
A kind of auxiliary cathode; The main body of said auxiliary cathode is the pipe of one section alloy material; The sealing of one end of said pipe, the other end has and the interstitial hole of the radial parallel of said pipe, on the sidewall near the said pipe of said interstitial hole, has several apertures (being convenient to electrolytic solution evenly flows) perpendicular to said pipe radial direction equably in blind hole; The both sides of said several apertures have the annular bracing frame that is enclosed within on the said pipe, and are jagged on the said annular bracing frame;
Also have connection hole on the said pipe, said connection hole links to each other with lead.
The diameter of interstitial hole is generally than the little 5～10mm of diameter of pipe.
Also have arm on the said pipe, said arm can overlap flexible pipe.
Said flexible pipe is connected with the inlet pipe of filter.
Said arm is that the said arm of PVC material is PVC material or other plastics dielectric material.On the said lead conductive clip is arranged, said conductive clip links to each other with cathode rod.
Said alloy is duraluminum or titanium alloy.
Above-mentioned arbitrary auxiliary cathode is carried out anodised method to blind hole, comprises the steps:
At first, the oxidation tank liquor is put in test block, more said auxiliary cathode is put into the blind hole of test block, (for example, 10～15mm) in order to avoid short circuit, and fixing said auxiliary cathode to keep certain distance at the bottom of said auxiliary cathode and the said blind hole hole; Then said test block is contacted with anode rod through hanger, open recycle pump, the conductive clip of said auxiliary cathode is linked to each other with said cathode rod, begin oxidation and obtain specified thickness until surface in said blind hole.
Sulfuric acid concentration is 150～200g/l in the said oxidation tank liquor, and temperature is 18～22 ℃.
End at pipe has an arm to link to each other (like Fig. 3) with the centre hole of pipe, and the other end links to each other with flexible pipe, so that the oxidation tank liquor flows in the hole.
Said circular support frame adopts PVC material material or other plastics dielectric material, burns workpiece to avoid aluminum pipe to contact with the workpiece hole wall causing short circuit.Having the breach that is evenly distributed can be convenient to electrolytic solution on the support frame as described above flows in blind hole.
There is thin steel wire said flexible pipe inside, to avoid flexible pipe distortion in oxidising process, causes instability of flow; One end of said flexible pipe is connected with said arm, and the other end links to each other with the inlet pipe that gets into electrolyzer, and the tank liquor of inlet pipe provides energy through the adjustment temperature by recycle pump.
Said lead adopts the aluminium alloy core that does not pollute tank liquor.Said lead connects conductive clip, can connect with cathode rod easily through conductive clip.
Compared with prior art, technique effect of the present invention is following:
First: because the electrolytic solution in blind hole is in the state that circulates, can in time take away the heat that oxidation produces, thereby can continue to generate sull.
Second: because the use of auxiliary cathode in blind hole arranged, make power line in blind hole, effectively to be distributed, thereby can make sull generation synchronously in the surface of workpiece and blind hole, improved the homogeneity of thickness, improved current efficiency, reduced energy consumption.
The 3rd: on negative electrode, adopt conductive clip, easy to use.Can be as required, disconnection and connection through conductive clip and cathode rod in oxidising process come closing and opening of controlled oxidation operation, in time adjust the oxide thickness in the blind hole.
Description of drawings
Fig. 1 is the structural representation of a kind of auxiliary cathode of using among the present invention;
Fig. 2 is the enlarged diagram of circular support frame and aluminum pipe centre hole in the auxiliary cathode among the present invention;
Fig. 3 is the auxiliary cathode main body sectional view of using among the present invention;
Fig. 4 be use among the present invention the structural representation of another kind of auxiliary cathode.
Embodiment
Below, further specify content of the present invention with embodiment, but protection scope of the present invention is not limited in embodiment.The variation and the modification of other that those skilled in the art is made under the situation that does not deviate from the present invention spirit and protection domain still are included within the protection domain of the present invention.
Embodiment 1
Present embodiment is to explain the application of the present invention in the dark 250mm of oxidation, diameter 50mm blind hole.
The preparation test block: getting one 400 * 200 * 350 (mm) materials is that (main alloy element of 6061 duraluminums is magnesium and silicon to 6061 duraluminums, and forms Mg
2The Si phase) simple bore (that is, blind hole) of a dark 250mm, diameter 50mm is made in test block above that, through screw thread test block is connected with hanger.
Fig. 1 is a used auxiliary cathode structural representation in the oxidation of the present invention.As shown in Figure 1; The main body 1 of said auxiliary cathode is a tube and pipe of aluminium alloy that is about 260mm, the about 25mm of diameter, end sealing, and the length of the other end interstitial hole 7 (shown in Fig. 2) is that 245～250mm is (shown in arrow A section among Fig. 3; The diameter of interstitial hole 7 is 20mm); At the bottom of near the hole on the pipe sidewall of a side equably have several apertures 4, its two ends are the annular bracing frame 3 that two diameters are 48mm, jagged 8 (as shown in Figure 2) on the annular bracing frame 3.One end of main body 1 has connection hole, and this connection hole links to each other with lead 6, to be used for through lead 6 main body 1 being linked to each other with negative electrode.End in main body 1 has arm 5, and the bore dia of arm 5 is 20mm, and an end of arm 5 is connected with the interstitial hole 7 of pipe, and the other end of arm 5 is that 20mm flexible pipe 2 links to each other with the aperture.
The other end of lead 6 can be adorned conductive clip, and this moment is through the opening and closing that are connected controlled oxidation operation of conductive clip with power supply.
Clamping
At first, the oxidation tank liquor is put in test block, more said auxiliary cathode is put into the blind hole (diameter is 50mm) of test block, keep the distance of 10～15mm at the bottom of said auxiliary cathode and the said blind hole hole, in order to avoid short circuit, and fixing said auxiliary cathode; Then said test block is contacted with anode rod through hanger, open recycle pump, the conductive clip of said auxiliary cathode is linked to each other with said cathode rod.
Anodic oxidation
Be total to knowledge like those skilled in the art, anodised pre-process and post-process flow process is handled by known usual manner this just no longer stating more; The oxidation tank liquor is put in the test block of handling well, and tank liquor is common oxidation tank liquor, and sulfuric acid concentration is 150～200g/l; Temperature is about 20 ℃, recycle pump is opened, by the time flexible pipe 2; Flexible pipe and the tank liquor pipeline UNICOM that gets into oxidation trough; Test block and auxiliary cathode are to immerse in the oxidation tank liquor all over. there is not great amount of bubbles in the electrolytic solution in the flexible pipe by the time, and the power-on oxidation, current density is 1A/dm
2, oxidation 60 minutes.
Detect test block surface oxidation thickness about 25 microns, thickness is about 18 microns in the blind hole.
Present embodiment is to explain the application of the present invention in the dark 250mm of oxidation, diameter 30mm blind hole.
The preparation test block: getting one 400 * 200 * 350 (unit is mm) material is 6061 duraluminum test blocks, makes the simple bore (that is, blind hole) of a dark 250mm, diameter 30mm above that, through screw thread test block is connected with hanger.
Preparation auxiliary cathode: the structure of the auxiliary cathode that present embodiment is used such as Fig. 4; With Fig. 1 some difference is arranged slightly, be that main body 9 is the tube and pipe of aluminium alloy of a long 260mm, diameter 15mm, the middle part of pipe is that a diameter is the through hole of 10mm; One end of main body 9 is connected with flexible pipe 13; There is individual connection hole 12 side of main body 1, and this connection hole is connected with lead 14, through lead 14 main body 9 is linked to each other with negative electrode.On main body 1 sidewall, have aperture 11 uniformly away from a side of connection hole; Its two ends are the bracing frame 10 that two diameters are the 28mm annular; Jagged 8 on the bracing frame, the other end of lead 6 is connected to conductive clip, the opening and closing of this conductive clip may command oxidation operation.
Clamping
At first, the oxidation tank liquor is put in test block, more said auxiliary cathode is put into the blind hole (diameter is 30mm) of test block; The said distance that keeps 10～15mm at the bottom of negative electrode and the said blind hole hole that helps; In order to avoid short circuit, and fixing said auxiliary cathode, then said test block is contacted with anode rod through hanger; Open recycle pump, the conductive clip of said auxiliary cathode is linked to each other with said cathode rod.
Anodic oxidation
Be total to knowledge like those skilled in the art, anodised pre-process and post-process flow process is handled by known usual manner this just no longer stating more; The oxidation tank liquor is put in the test block of handling well, and tank liquor is that (sulfuric acid concentration is 150～200g/l to common oxidation tank liquor, and the concentration of trivalent aluminium ion is 1～15g/l); Temperature is about 20 degree, recycle pump is opened, in the flexible pipe electrolytic solution in do not have great amount of bubbles; Power-on oxidation, current density are 1A/dm
2, oxidation 50 minutes.
Detect the surface oxidation thickness about 24 microns, thickness is about 18 microns in the hole.
Present embodiment is used to explain the application of the present invention aspect hardening oxidation.
The preparation test block: getting a 400*200*350 (unit is mm) material is 6061 duraluminum test blocks, makes a dark 250mm above that, and the simple bore of diameter 20mm (that is, blind hole) is connected test block through screw thread with hanger.
The preparation auxiliary cathode
The structural representation of the auxiliary cathode that present embodiment is used is also as shown in Figure 1, and just size and embodiment 1 have difference.Main body 1 is the tube and pipe of aluminium alloy of a long 260mm, diameter 10mm, end sealing, and the diameter of the other end interstitial hole 7 is 8mm; On main body 1 sidewall away from a side of connection hole, have aperture 4 uniformly, its two ends are the bracing frame 3 that two diameters are 18 annulars, the breach 8 on the bracing frame; One end of pipe has individual connection hole; Link to each other with negative electrode through lead 6 being used for, the other end of lead is connected to conductive clip, at an end of pipe an arm 5 is arranged; The aperture is 8 to link to each other with the centre hole of pipe, and the other end is that 8mm flexible pipe 2 links to each other with the aperture.
Clamping
At first, the oxidation tank liquor is put in test block, more said auxiliary cathode is put into the blind hole (diameter is a 20mm unit) of test block, the said distance that keeps 10～15mm at the bottom of negative electrode and the said blind hole hole that helps is in order to avoid short circuit. and fixing said auxiliary cathode; Then said test block is contacted with anode rod through hanger, open recycle pump, the conductive clip of said auxiliary cathode is linked to each other with said cathode rod.
Anodic oxidation
Be total to knowledge like those skilled in the art, anodised pre-process and post-process flow process is handled by known ordinary method this just no longer stating more; The oxidation tank liquor is put in the test block of handling well, and tank liquor is common oxidation tank liquor, and sulfuric acid concentration is 150～200g/l; Temperature is 0 ± 2 degree, and recycle pump is opened, and does not have great amount of bubbles in the electrolytic solution in flexible pipe; Power-on oxidation, current density are 2A/dm
2, oxidation 60 minutes.
Detect the surface oxidation thickness about 45 microns, thickness is about 38 microns in the hole.
Embodiment 4
Present embodiment is intended to explain if the sull formation speed in the hole is too fast, can be through oxide thickness in the method adjustment blind hole of present embodiment.
The preparation test block: getting a 400*200*350 (unit is mm) material is 6061 duraluminum test blocks, makes a dark 250mm above that, and the simple bore of diameter 50mm (that is, blind hole) is connected test block through screw thread with hanger,
The preparation auxiliary cathode
Negative electrode as shown in Figure 1 is please consulted Fig. 1 earlier, and Fig. 1 is a used auxiliary cathode structural representation in the oxidation of the present invention.The pipe of 1 long 260mm diameter 25mm duraluminums of main body, end sealing, the other end interstitial hole 7 diameters are 20mm; On the pipe sidewall near the side at the bottom of the hole, have aperture 4 uniformly, its two ends are the bracing frame 3 that two diameters are the 48mm annular, the breach 8 on the bracing frame; One end of pipe has individual connection hole; Link to each other with negative electrode through lead 6 being used for, the other end of lead is connected to conductive clip, at an end of pipe an arm 5 is arranged; The aperture is 20 to link to each other with the centre hole of pipe, and the other end is that 20 flexible pipes 2 link to each other with the aperture.
Clamping
At first, the oxidation tank liquor is put in test block, more said auxiliary cathode is put into the blind hole (diameter is 50 mm of unit) of test block, said auxiliary cathode helps the distance that keeps 10～15mm at the bottom of negative electrode and the said blind hole hole, in order to avoid short circuit, and fixing said auxiliary cathode; Then said test block is contacted with anode rod through hanger, open recycle pump, the conductive clip of said auxiliary cathode is linked to each other with said cathode rod.
Anodic oxidation
Be total to knowledge like those skilled in the art, anodised pre-process and post-process flow process is put into the oxidation tank liquor this just no longer stating with the test block of handling well more; Tank liquor is common oxidation tank liquor, and sulfuric acid concentration is 150～200g/l, and temperature is 0 ± 2 degree; Recycle pump is opened; In the flexible pipe electrolytic solution in do not have great amount of bubbles, the power-on oxidation, current density is 2A/dm
2, oxidation 70 minutes.
Detect the surface oxidation thickness about 55 microns, thickness is about 50 microns in the hole.Inside and outside thickness differs about 5 microns, throws off conductive clip and cathode rod, continues oxidation 10 minutes, and the surface oxidation film thickness reaches about 60 microns, and inside and outside film thickness difference reaches 10 microns.
Embodiment 5
Present embodiment is to explain that auxiliary cathode of the present invention can also adopt titanium alloy, (titanium alloy is difficult for loss than duraluminum).
The preparation test block: getting one 400 * 200 * 350 (mm) materials is that (main alloy element of 6061 duraluminums is magnesium and silicon to 6061 duraluminums, and forms Mg
2The Si phase) simple bore (that is, blind hole) of a dark 250mm, diameter 50mm is made in test block above that, through screw thread test block is connected with hanger.
Fig. 1 is a used auxiliary cathode structural representation in the oxidation of the present invention.As shown in Figure 1; The main body 1 of said auxiliary cathode is a titanium alloy pipe that is about 260mm, the about 25mm of diameter, end sealing, and the other end interstitial hole 7 is (shown in Fig. 2; Its length L is the distance of the center of arm 5 to cathode titanium pipe end face) diameter be 20mm; At the bottom of near the hole on the pipe sidewall of a side equably have several apertures 4, its two ends are that two diameters are 48mm annular bracing frame 3, jagged 8 (as shown in Figure 2) on the annular bracing frame 3.One end of main body 1 has connection hole, and this connection hole links to each other with lead 6, to be used for through lead 6 main body 1 being linked to each other with negative electrode.End in main body 1 has arm 5, and the bore dia of arm 5 is 20mm, and an end of arm 5 is connected with the centre hole 7 of pipe, and the other end of arm 5 is that 20mm flexible pipe 2 links to each other with the aperture.
The other end of lead 6 can be adorned conductive clip, and this moment is through the opening and closing that are connected controlled oxidation operation of conductive clip with power supply.
Clamping
At first, the oxidation tank liquor is put in test block, more said auxiliary cathode is put into the blind hole (diameter is 50mm) of test block, keep the distance of 10～15mm at the bottom of said auxiliary cathode and the said blind hole hole, in order to avoid short circuit, and fixing said auxiliary cathode; Then said test block is contacted with anode rod through hanger, open recycle pump, the conductive clip of said auxiliary cathode is linked to each other with said cathode rod.
Anodic oxidation
Be total to knowledge like those skilled in the art, anodised pre-process and post-process flow process is handled by known usual manner this just no longer stating more; The oxidation tank liquor is put in the test block of handling well, and tank liquor is common oxidation tank liquor, and sulfuric acid concentration is 150～200g/l; Temperature is about 20 ℃; Recycle pump is opened, do not had great amount of bubbles in the electrolytic solution in the flexible pipe 2 (flexible pipe is logical with the tank liquor pipeline that gets into oxidation trough, and test block and auxiliary cathode are to immerse in the oxidation tank liquor all over .) by the time; Power-on oxidation, current density are 1A/dm
2, oxidation 60 minutes.
Detect test block surface oxidation thickness about 25 microns, thickness is about 18 microns in the blind hole.
Bright through verifying, according to different blind hole sizes, change the size of auxiliary cathode flexibly; Adopt the present invention that the big workpiece that has blind hole is carried out anodic oxidation; Can not only obtain sull at parts list, can also in the deep hole of part, obtain needed sull, thereby satisfy the functional requirement of part; Simultaneously, therefore can adjust the interior oxide thickness of workpiece blind hole as required in oxidising process because auxiliary cathode can be broken off and connects through conductive clip.
Claims (8)
1. auxiliary cathode; It is characterized in that; The main body of said auxiliary cathode is the pipe of one section alloy material; The sealing of one end of said pipe, the other end has and the interstitial hole of the radial parallel of said pipe, on the sidewall near the said pipe of said interstitial hole, has several apertures perpendicular to said pipe radial direction equably; The both sides of said several apertures have the annular bracing frame that is enclosed within on the said pipe, and are jagged on the said annular bracing frame;
Also have connection hole on the said pipe, said connection hole links to each other with lead.
2. auxiliary cathode according to claim 1 is characterized in that, also has arm on the said pipe, and said arm can overlap flexible pipe.
3. auxiliary cathode according to claim 2 is characterized in that, said flexible pipe is connected with the import of filter.
4. auxiliary cathode according to claim 2 is characterized in that, said arm is the PVC material.
5. auxiliary cathode according to claim 1 is characterized in that, on the said lead conductive clip is arranged, and said conductive clip links to each other with cathode rod.
6. auxiliary cathode according to claim 1 is characterized in that, said alloy is duraluminum or titanium alloy.
7. utilize the arbitrary described auxiliary cathode of claim 1～6 that blind hole is carried out anodised method, it is characterized in that, comprise the steps:
At first, the oxidation tank liquor is put in test block, more said auxiliary cathode is put into the blind hole of test block, keep certain distance at the bottom of said auxiliary cathode and the said blind hole hole in order to avoid short circuit, and fixing said auxiliary cathode; Then said test block is contacted with anode rod through hanger, open recycle pump, the conductive clip of said auxiliary cathode is linked to each other with said cathode rod, begin oxidation and obtain specified thickness until surface in said blind hole.
8. method according to claim 7 is characterized in that, said distance is 10～15mm.
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| CN103014803A (en) * | 2012-12-28 | 2013-04-03 | 江苏大学 | Small hole strengthening method with combination of laser shock and micro-arc oxidation |
| CN104499023A (en) * | 2014-12-16 | 2015-04-08 | 广州中国科学院先进技术研究所 | Anodic oxidation method of spare part containing blind hole |
| CN106244992A (en) * | 2016-09-06 | 2016-12-21 | 桂林电子科技大学 | A kind of double brightness metallic cementation source electrode auxiliary cathode cylinder |
| CN107164736A (en) * | 2017-05-11 | 2017-09-15 | 合肥开泰机电科技有限公司 | Aperture inwall vacuum ionic electroplating method under electric field guiding |
| CN109778279A (en) * | 2018-12-26 | 2019-05-21 | 沈阳富创精密设备有限公司 | A kind of uniform anode oxidation process of cavity |
| CN110230082A (en) * | 2019-07-18 | 2019-09-13 | 烟台大学 | A kind of boundling cathode micro arc oxidation membrane preparation device and method |
| CN111534845A (en) * | 2020-06-10 | 2020-08-14 | 上海宝敦金属表面处理厂(普通合伙) | Local anodic oxidation equipment for valve body |
| CN111690970A (en) * | 2020-06-10 | 2020-09-22 | 上海宝敦金属表面处理厂(普通合伙) | Valve body local anodic oxidation method |
| CN113373496A (en) * | 2021-05-19 | 2021-09-10 | 中航西安飞机工业集团股份有限公司 | Electrochemical treatment auxiliary electrode and use method |
| CN114214702A (en) * | 2021-12-20 | 2022-03-22 | 鸿富锦精密电子（成都）有限公司 | Method and apparatus for etching alloy plate having slot |
| CN114481253A (en) * | 2021-12-20 | 2022-05-13 | 河南平高电气股份有限公司 | Method for improving in-hole anodic oxidation deep plating capacity of porous part |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103014803A (en) * | 2012-12-28 | 2013-04-03 | 江苏大学 | Small hole strengthening method with combination of laser shock and micro-arc oxidation |
| CN103014803B (en) * | 2012-12-28 | 2016-03-02 | 江苏大学 | The reinforcement method for small hole that a kind of laser-impact and differential arc oxidation combine |
| CN104499023A (en) * | 2014-12-16 | 2015-04-08 | 广州中国科学院先进技术研究所 | Anodic oxidation method of spare part containing blind hole |
| CN106244992A (en) * | 2016-09-06 | 2016-12-21 | 桂林电子科技大学 | A kind of double brightness metallic cementation source electrode auxiliary cathode cylinder |
| CN107164736A (en) * | 2017-05-11 | 2017-09-15 | 合肥开泰机电科技有限公司 | Aperture inwall vacuum ionic electroplating method under electric field guiding |
| CN109778279A (en) * | 2018-12-26 | 2019-05-21 | 沈阳富创精密设备有限公司 | A kind of uniform anode oxidation process of cavity |
| CN110230082A (en) * | 2019-07-18 | 2019-09-13 | 烟台大学 | A kind of boundling cathode micro arc oxidation membrane preparation device and method |
| CN111534845A (en) * | 2020-06-10 | 2020-08-14 | 上海宝敦金属表面处理厂(普通合伙) | Local anodic oxidation equipment for valve body |
| CN111690970A (en) * | 2020-06-10 | 2020-09-22 | 上海宝敦金属表面处理厂(普通合伙) | Valve body local anodic oxidation method |
| CN113373496A (en) * | 2021-05-19 | 2021-09-10 | 中航西安飞机工业集团股份有限公司 | Electrochemical treatment auxiliary electrode and use method |
| CN114214702A (en) * | 2021-12-20 | 2022-03-22 | 鸿富锦精密电子（成都）有限公司 | Method and apparatus for etching alloy plate having slot |
| CN114481253A (en) * | 2021-12-20 | 2022-05-13 | 河南平高电气股份有限公司 | Method for improving in-hole anodic oxidation deep plating capacity of porous part |
| CN114481253B (en) * | 2021-12-20 | 2024-03-29 | 河南平高电气股份有限公司 | Method for improving anodic oxidation deep plating capacity in holes of porous parts |
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