CN106835229A - A kind of tube kind part hard anodized method long - Google Patents
A kind of tube kind part hard anodized method long Download PDFInfo
- Publication number
- CN106835229A CN106835229A CN201710077856.2A CN201710077856A CN106835229A CN 106835229 A CN106835229 A CN 106835229A CN 201710077856 A CN201710077856 A CN 201710077856A CN 106835229 A CN106835229 A CN 106835229A
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- Prior art keywords
- tube
- hard anodized
- solution
- hard
- type part
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Classifications
-
- 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
- C25D11/024—Anodisation under pulsed or modulated current or potential
-
- 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
- C25D11/005—Apparatus specially adapted for electrolytic conversion coating
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
- C25D17/10—Electrodes, e.g. composition, counter electrode
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D7/00—Electroplating characterised by the article coated
- C25D7/04—Tubes; Rings; Hollow bodies
Abstract
The present invention relates to a kind of hard anodized method of tube kind part long, increase auxiliary cathode by cartridge type part inner chamber, avoid due to the partially thin phenomenon of the uneven caused thicknesses of layers of CURRENT DISTRIBUTION, air stirring is carried out by cartridge type part inner chamber, avoid due to the thin phenomenon of the not smooth caused thicknesses of layers of internal diameter solution circulation, and the clamping for passing through hard aluminium alloy bar, it is to avoid negative electrode vibration causes local without the larger problem of film layer area caused by the risk that electricity injures and traditional installation way.The present invention is effectively guaranteed the homogeneity of the inside and outside footpath thicknesses of layers of tube-type part, it is to avoid the dimension overproof after precision component hard anodized.
Description
Technical field
The present invention relates to a kind of hard anodized method of hard anodized method, especially tube kind part long.
Background technology
The part of aero-engine and transmission system is generally aluminum alloy materials, use its anti-wear performance hard sun to improve more
Polarization method.Existing hard anodized step is：
(1) chemical degreasing is carried out in aqueous slkali, surface and oil contaminant is removed；
(2) etch, removal surface scale and the alloying component that film quality may be influenceed are carried out in acid solution；
(3) the hard anodized treatment in phosphoric acid, sulfuric acid or in mixed acid solution.
And for tube-type part hard anodized long during, due to solution circulated in part inner-diameter portion it is not smooth, it is internal
CURRENT DISTRIBUTION is relatively outside uneven, causes inside parts thicknesses of layers compared with outer thin, inner-diameter portion hard anodized thicknesses of layers
It is difficult to ensure that.
The content of the invention
It is an object of the invention to provide a kind of hard anodized method of tube kind part long, the method is effectively guaranteed cylinder
The homogeneity of the inside and outside footpath thicknesses of layers of type part, it is to avoid the dimension overproof after precision component hard anodized.
The technical scheme is that：
(1) oil removing
A) the tube-type part surface long that hard anodized is treated with acetone or gasoline is cleaned；
B) electrochemical deoiling is carried out in alkaline solution, surface and oil contaminant is thoroughly removed, described alkaline solution is to contain sodium carbonate
40g/L, sodium phosphate 20g/L, the mixed solution of sodium metasilicate 0.5g/L；
C) more than 2min is cleaned in 55 DEG C of the aqueous solution is not less than, piece surface residual alkalinity solution is removed；
D) remove oil quality with moisture film continuation method inspection, if within 30 second time moisture film continuous uniform, be not fractured into oil removing conjunction
Lattice, otherwise repeat above-mentioned operation qualified to oil removing；
(2) light extraction
A) it is 1 in mass ratio：To part etch 0.5min~2min in the mixed solution of 5 chromic anhydrides and sulfuric acid, electrochemical deoiling is removed
Residue afterwards；
B) more than countercurrent rinsing 2min in deionized water, removes surface residual solution；
(3) clamping inner cathode
A) a diameter of tube-type part internal diameter 1/10 is used, length is with the isometric cylindrical lead rod of tube-type part as auxiliary cathode；
B) by length and the isometric hard aluminium alloy bar clamping of tube-type part diameter in the upper and lower end face of part, and in hard aluminium alloy bar
Central bore, installs lead electrode, it is to avoid lead electrode contacts the electricity for causing with inwall and injures；
(4) hard anodized
Hard anodized treatment is carried out in concentration is for the sulfuric acid solution of 150g/L~200g/L, using compression in anodizing process
Air is continuously stirred, and using pulse current, initial current density is 0.5A/dm2~1A/dm2, after anodization 15min~20min,
Every 5min elevated currents 5A, until current density reaches 2.5A/dm2~5A/dm2, stop after reaching final voltage 55V~60V
Anodization；
(5) dry
Surface is dried up with by the cleaned hot compressed air for being not more than 60 DEG C of oil water separator；To prevent acid solution from remaining shadow
Film layer presentation quality is rung, it should be specifically noted that the drying to ditch, groove, deep hole and blind hole；
(6) final inspection
Visual inspection film layer presentation quality, color should be grey, dark gray to black or yellowish-brown, and film layer should continuous, uniform, cause
It is close, complete；Internal diameter and outer radius hard anodized thicknesses of layers are detected with eddy current thickness meter, is tested with microhardness testers
The hardness of anodization film layer.
After described oil removing for avoid pollution part must not bare-handed touch part, should with clean gloves, or with process
The clip of oil removing or other suitable instrument crawl parts.
The present invention increases auxiliary cathode by cartridge type part inner chamber, is effectively guaranteed inside diameter during hard anodized
The homogeneous current distribution of position, it is to avoid due to CURRENT DISTRIBUTION it is uneven caused by the partially thin phenomenon of thicknesses of layers；By in cartridge type part
Inner chamber carries out air stirring, be effectively guaranteed the solution concentration at internal diameter position during hard anodized, it is to avoid due to interior
The thin phenomenon of thicknesses of layers caused by footpath solution circulation is not smooth；By the clamping of hard aluminium alloy bar, it is to avoid negative electrode vibration causes
It is local without the larger problem of film layer area caused by risk that electricity is injured and traditional installation way.The present invention is effectively guaranteed cylinder
The homogeneity of the inside and outside footpath thicknesses of layers of type part, it is to avoid the dimension overproof after precision component hard anodized.
Specific embodiment
A kind of hard anodized method of tube kind part long, it is concretely comprised the following steps：
(1) oil removing
A) the tube-type part surface long that hard anodized is treated with acetone or gasoline is cleaned；
B) electrochemical deoiling is carried out in alkaline solution, surface and oil contaminant is thoroughly removed, described alkaline solution is to contain sodium carbonate
40g/L, sodium phosphate 20g/L, the mixed solution of sodium metasilicate 0.5g/L；
C) more than 2min is cleaned in 55 DEG C of the aqueous solution is not less than, piece surface residual alkalinity solution is removed；
D) remove oil quality with moisture film continuation method inspection, if within 30 second time moisture film continuous uniform, be not fractured into oil removing conjunction
Lattice, otherwise repeat above-mentioned operation qualified to oil removing；
(2) light extraction
A) it is 1 in mass ratio：To part etch 0.5min~2min in the mixed solution of 5 chromic anhydrides and sulfuric acid, electrochemical deoiling is removed
Residue afterwards；
B) more than countercurrent rinsing 2min in deionized water, removes surface residual solution；
(3) clamping inner cathode
A) a diameter of tube-type part internal diameter 1/10 is used, length is with the isometric cylindrical lead rod of tube-type part as auxiliary cathode；
B) by length and the isometric hard aluminium alloy bar clamping of tube-type part diameter in the upper and lower end face of part, and in hard aluminium alloy bar
Central bore, installs lead electrode, it is to avoid lead electrode contacts the electricity for causing with inwall and injures；
(4) hard anodized
Hard anodized treatment is carried out in concentration is for the sulfuric acid solution of 150g/L~200g/L, using compression in anodizing process
Air is continuously stirred, and using pulse current, initial current density is 0.5A/dm2~1A/dm2, after anodization 15min~20min,
Every 5min elevated currents 5A, until current density reaches 2.5A/dm2~5A/dm2, stop after reaching final voltage 55V~60V
Anodization；
(5) dry
Surface is dried up with by the cleaned hot compressed air for being not more than 60 DEG C of oil water separator；To prevent acid solution from remaining shadow
Film layer presentation quality is rung, it should be specifically noted that the drying to ditch, groove, deep hole and blind hole；
(6) final inspection
Visual inspection film layer presentation quality, color should be grey, dark gray to black or yellowish-brown, and film layer should continuous, uniform, cause
It is close, complete；Internal diameter and outer radius hard anodized thicknesses of layers are detected with eddy current thickness meter, is tested with microhardness testers
The hardness of anodization film layer.
After described oil removing for avoid pollution part must not bare-handed touch part, should with clean gloves, or with process
The clip of oil removing or other suitable instrument crawl parts.
Embodiment
The hard anodized of certain engine bulb sleeve pipe.The bulb sleeve pipe is thin-wall part, and material is 2A70 aluminium alloys, wall thickness
2mm, diameter of part 75mm, length 288mm.Need to carry out part all surfaces hard anodized treatment, thicknesses of layers requirement
0.06mm~0.08mm, hardness requirement is more than 250Hv.
Implementation process
(1) oil removing
A) the tube-type part surface long that hard anodized is treated with gasoline is cleaned；
B) electrochemical deoiling is carried out in alkaline solution, surface and oil contaminant is thoroughly removed, described alkaline solution is to contain sodium carbonate
40g/L, sodium phosphate 20g/L, the mixed solution of sodium metasilicate 0.5g/L；
C) 3min is cleaned in 60 DEG C of deionized water, piece surface residual alkalinity solution is removed；
D) remove oil quality with moisture film continuation method inspection, 30s moisture films continuous uniform, be not broken；
(2) light extraction
A) it is 1 in mass ratio：To part etch 1min in the mixed solution of 5 chromic anhydrides and sulfuric acid；
B) 2min is cleaned in the deionized water of flowing, residual solution is removed；
(3) clamping inner cathode
A) φ 10mm are used, the lead rod of length 288mm is used as inner cathode；
B) by length and the isometric hard aluminium alloy bar clamping of tube-type part diameter in the upper and lower end face of part, and in hard aluminium alloy bar
Central bore, installs lead electrode, it is to avoid lead electrode contacts the electricity for causing with inwall and injures；
(4) hard anodized
Hard anodized treatment is carried out in concentration is for the sulfuric acid solution of 190g/L, air for continuous is utilized in anodizing process
Stirring, using pulse current, initial current density is 0.5A/dm2, after anodization 15min, every 5min elevated currents 5A, extremely
Current density reaches 4A/dm2, anodization is stopped after reaching final voltage 57V；
(5) dry
Surface is dried up with the hot compressed air by oil water separator cleaned 55 DEG C；
(6) final inspection
Internal-and external diameter hard anodized film layer is in black, continuous, uniform, fine and close, hard to bulb sleeve pipe internal-and external diameter with eddy current thickness meter
Matter anodization film layer is detected that internal diameter thicknesses of layers average is 0.063mm, and external diameter thicknesses of layers average is 0.065mm；It is micro-
Hardometer measures film hardness 275Hv.In summary, hard anodized film performance meets use requirement.
Claims (2)
1. a kind of hard anodized method of tube kind part long, it is characterised in that described method is comprised the following steps：
(1) oil removing
A) the tube-type part surface long that hard anodized is treated with acetone or gasoline is cleaned；
B) electrochemical deoiling is carried out in alkaline solution, surface and oil contaminant is thoroughly removed, described alkaline solution is to contain sodium carbonate
40g/L, sodium phosphate 20g/L, the mixed solution of sodium metasilicate 0.5g/L；
C) more than 2min is cleaned in 55 DEG C of the aqueous solution is not less than, piece surface residual alkalinity solution is removed；
D) remove oil quality with moisture film continuation method inspection, if within 30 second time moisture film continuous uniform, be not fractured into oil removing conjunction
Lattice, otherwise repeat above-mentioned operation qualified to oil removing；
(2) light extraction
A) it is 1 in mass ratio：To part etch 0.5min~2min in the mixed solution of 5 chromic anhydrides and sulfuric acid, electrochemical deoiling is removed
Residue afterwards；
B) more than countercurrent rinsing 2min removes surface residual solution in deionized water；
(3) clamping inner cathode
A) a diameter of tube-type part internal diameter 1/10 is used, length is with the isometric cylindrical lead rod of tube-type part as auxiliary cathode；
B) by length and the isometric hard aluminium alloy bar clamping of tube-type part diameter in the upper and lower end face of part, and in hard aluminium alloy bar
Central bore, installs lead electrode, it is to avoid lead electrode contacts the electricity for causing with inwall and injures；
(4) hard anodized
Hard anodized treatment is carried out in concentration is for the sulfuric acid solution of 150g/L~200g/L, using compression in anodizing process
Air is continuously stirred, and using pulse current, initial current density is 0.5A/dm2~1A/dm2, after anodization 15min~20min,
Every 5min elevated currents 5A, until current density reaches 2.5A/dm2~5A/dm2, stop after reaching final voltage 55V~60V
Anodization；
(5) dry
Surface is dried up with by the cleaned hot compressed air for being not more than 60 DEG C of oil water separator；To prevent acid solution from remaining shadow
Film layer presentation quality is rung, it should be specifically noted that the drying to ditch, groove, deep hole and blind hole；
(6) final inspection
Visual inspection film layer presentation quality, color should be grey, dark gray to black or yellowish-brown, and film layer should continuous, uniform, cause
It is close, complete；Internal diameter and outer radius hard anodized thicknesses of layers are detected with eddy current thickness meter, is tested with microhardness testers
The hardness of anodization film layer.
2. a kind of hard anodized method of tube kind part long as claimed in claim 1, it is characterised in that in described oil removing
Afterwards for avoid pollution part must not bare-handed touch part, should be with clean gloves, or with by the clip of oil removing or other are suitable
Instrument crawl part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710077856.2A CN106835229A (en) | 2017-02-14 | 2017-02-14 | A kind of tube kind part hard anodized method long |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710077856.2A CN106835229A (en) | 2017-02-14 | 2017-02-14 | A kind of tube kind part hard anodized method long |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106835229A true CN106835229A (en) | 2017-06-13 |
Family
ID=59127432
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710077856.2A Pending CN106835229A (en) | 2017-02-14 | 2017-02-14 | A kind of tube kind part hard anodized method long |
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| Country | Link |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109234781A (en) * | 2018-11-08 | 2019-01-18 | 北京星航机电装备有限公司 | A kind of hard anodizing pre-treating technology being adapted to groove, the protection of blind hole position |
| 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 |
| CN115125597A (en) * | 2022-06-24 | 2022-09-30 | 中航飞机起落架有限责任公司 | Hard anodizing device for deep hole of workpiece |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109234781A (en) * | 2018-11-08 | 2019-01-18 | 北京星航机电装备有限公司 | A kind of hard anodizing pre-treating technology being adapted to groove, the protection of blind hole position |
| 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 |
| CN115125597A (en) * | 2022-06-24 | 2022-09-30 | 中航飞机起落架有限责任公司 | Hard anodizing device for deep hole of workpiece |
| CN115125597B (en) * | 2022-06-24 | 2023-10-24 | 中航飞机起落架有限责任公司 | Hard anodic oxidation device for deep hole of workpiece |
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