CN106498473A - A kind of 2297 T87 aluminium lithium alloy aviation part sulfur acid anodizing pre-treating methods - Google Patents
A kind of 2297 T87 aluminium lithium alloy aviation part sulfur acid anodizing pre-treating methods Download PDFInfo
- Publication number
- CN106498473A CN106498473A CN201611115879.XA CN201611115879A CN106498473A CN 106498473 A CN106498473 A CN 106498473A CN 201611115879 A CN201611115879 A CN 201611115879A CN 106498473 A CN106498473 A CN 106498473A
- Authority
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- China
- Prior art keywords
- shot
- hole
- sulfur acid
- acid anodizing
- aluminium lithium
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000000034 method Methods 0.000 title claims abstract description 38
- 239000002253 acid Substances 0.000 title claims abstract description 24
- 238000007743 anodising Methods 0.000 title claims abstract description 22
- 229910052717 sulfur Inorganic materials 0.000 title claims abstract description 22
- 239000011593 sulfur Substances 0.000 title claims abstract description 22
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 title claims abstract description 20
- 229910001148 Al-Li alloy Inorganic materials 0.000 title claims abstract description 17
- FCVHBUFELUXTLR-UHFFFAOYSA-N [Li].[AlH3] Chemical compound [Li].[AlH3] FCVHBUFELUXTLR-UHFFFAOYSA-N 0.000 title claims abstract description 17
- 239000001989 lithium alloy Substances 0.000 title claims abstract description 17
- 238000005480 shot peening Methods 0.000 claims abstract description 23
- 238000005422 blasting Methods 0.000 claims abstract description 19
- 238000002048 anodisation reaction Methods 0.000 claims abstract description 16
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 16
- 230000003647 oxidation Effects 0.000 claims abstract description 11
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 10
- 229910001208 Crucible steel Inorganic materials 0.000 claims description 9
- 239000011324 bead Substances 0.000 claims description 7
- 238000003754 machining Methods 0.000 claims description 7
- 238000003672 processing method Methods 0.000 claims description 4
- 238000001125 extrusion Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 230000007547 defect Effects 0.000 abstract description 5
- 238000004381 surface treatment Methods 0.000 abstract description 5
- 229910000838 Al alloy Inorganic materials 0.000 abstract description 3
- 230000000472 traumatic effect Effects 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 238000011017 operating method Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009940 knitting Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
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
- C25D11/04—Anodisation of aluminium or alloys based thereon
- C25D11/16—Pretreatment, e.g. desmutting
-
- 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
- C25D11/04—Anodisation of aluminium or alloys based thereon
- C25D11/06—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used
- C25D11/08—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used containing inorganic acids
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- ing And Chemical Polishing (AREA)
Abstract
The invention belongs to aluminium alloy aviation part manufacturing technology field, is related to a kind of 2297 T87 aluminium lithium alloys aviation part sulfur acid anodizing pre-treating method.The step of the method, includes：Part machinery is processed, and hole is processed, surface treatment, ungrease treatment, surface anodization process.The characteristics of present invention has relatively strong internal subgrain texture for 2297 T87 aluminium lithium alloys, increases the hole handling process of part and process of surface treatment in sulfur acid anodizing pretreatment stage.Extruded by aperture or shot-peening device to hole process, and the shot blasting on surface of part processes and piece surface integrity is effectively repaired, so as to improve the compactness and seriality of part sulfur acid anodizing oxidation film layer, reduce or eliminate oxidation film layer defect, improve part traumatic resistance energy.The present invention can improve part decay resistance and fatigue life；And operating procedure is easy, is not required to separately build production facility, beneficial to production control.
Description
Technical field
The invention belongs to aluminium alloy aviation part manufacturing technology field, is related to a kind of 2297-T87 aluminium lithium alloys aviation part
Sulfur acid anodizing pre-treating method.
Background technology
With the further development of technology, the service life of aircraft main force support structure of new generation, environmental resistance are proposed
Requirements at the higher level, new material and new technique have obtained substantial amounts of application, and 2297-T87 aluminium lithium alloy slabs are a kind of manufacture aircrafts
The material of new generation of large complicated primary load bearing component, its product have preferable fatigue life.2297-T87 aluminium lithium alloys are main
Composition about contains 2.8%Cu, 1.5%Li, 0.30%Mn and 0.12%Zr.2297-T87 aluminium lithium alloys slab has higher knitting
Structure Strengthening and Toughening effect, employs big pre-tension deformation amount controlled material obdurability in preparation process.
The manufacture of aluminium alloy aviation part generally comprises the techniques such as machining, surface anodization process.Surface anodization process
Need the cleaning that surface is carried out to part, referred to as anodization pre-treating technology before enforcement.General anodization pre-treating technology
For alkali cleaning or mixed acid (nitric acid, Fluohydric acid., chromic anhydride etc.) deoxidation, the method makes piece surface easily produce grain boundary networks, goes out
Existing original grain boundary evidence of corrosion defect, has a negative impact to the raising of fatigue life.
Content of the invention
The purpose of the present invention is to propose to one kind can improve 2297-T87 aluminium lithium alloy aviation part decay resistances and fatigue
The sulfur acid anodizing pre-treating method in life-span.
The technical scheme is that：Steps of the method are：
(1) part machinery processing
Aluminium lithium alloy slab is carried out machining by Element Design requirement, machining removal amount is not less than 3.0mm；
(2) hole is processed
No more than the hole of Φ 10mm adopts aperture extrusion process, crushed increscence amount to be not less than 0.15mm；More than Φ 10mm's
Hole adopts bead, and from 0.70mm cast steel balls as blasting media, to part hole wall surface shot-peening, shot peening strength is
0.10A, coverage rate are 100%～200%；
(3) shot blasting on surface is processed
Piece surface adopts bead, from 0.70mm cast steel balls as blasting media, to piece surface shot-peening, shot-peening
Intensity is 0.10A, and coverage rate is 100%～200%；
(4) ungrease treatment
The enforcement of 2A12 machined parts processing method is pressed in part ungrease treatment；
(5) sulfur acid anodizing is processed
Piece surface anodization adopts sulfur acid anodizing technique, and technological parameter is：Sulfuric acid concentration be 150g/L～
250g/L, 20～25 DEG C of tank liquor temperature, oxidization time 28 minutes, 13～15V of oxidation voltage.
It is an advantage of the invention that：The characteristics of there is relatively strong internal subgrain texture for 2297-T87 aluminium lithium alloys in the present invention,
Increase the hole handling process of part and process of surface treatment in sulfur acid anodizing pretreatment stage.Extruded by aperture or shot-peening pair
The process in hole, and part shot blasting on surface process piece surface integrity is effectively repaired, so as to improve part
The compactness and seriality of sulfur acid anodizing oxidation film layer, reduces or eliminates oxidation film layer defect, improve part traumatic resistance energy.
The present invention changes according to the characteristics of 2297-T87 aluminium lithium alloy slab compositions, microstructure texture and big pre-tension deformation amount
2297 alloy aviation part sulfur acid anodizing pre-treating technologies are entered.It is mainly characterized in that：Part is using aperture mechanical presses or spray
Hole on ball PROCESS FOR TREATMENT part, using shot-blast process parts processed surface, builds the new surface integrity of part, improves part
The compactness and seriality of oxidation film layer, reduces or eliminates oxidation film layer defect, improve part corrosion resistance and fatigue performance；Zero
Part is using shot blasting on surface and the composite surface treatment method of anodization phase superposition, it is ensured that generates relatively thin anodization film layer and reaches reason
The corrosion protection effect that thinks.
The present invention is remarkably improved the decay resistance of 2297-T87 aluminium lithium alloy aviation parts and tired explanation.Its reason
It is：1) the new surface integrity of part is constructed to the process in piece surface and hole by the present invention；2) improved by the present invention
The decay resistance of part noumenon；3) preferable corrosion protection effect is reached, using the compound of shot-peening and anodization phase superposition
Surface treatment method only needs relatively thin anodization film layer.
The present invention can effectively improve piece surface integrity, it is to avoid surface defects of parts, improve oxide-film consistency and
Seriality.
Specific embodiment
Below the present invention is described in further details.Before a kind of 2297-T87 aluminium lithium alloys aviation part sulfur acid anodizing
Processing method, takes the method improve part decay resistance and fatigue life.It is characterized in that steps of the method are：
(1) part machinery processing
Aluminium lithium alloy slab is carried out machining by Element Design requirement, any position machining removal amount is not less than
3.0mm.
(2) hole is processed
No more than the hole of Φ 10mm adopts aperture extrusion process, crushed increscence amount to be not less than 0.15mm；More than Φ 10mm's
Hole hole wall adopts bead, and from 0.70mm cast steel balls as blasting media, to piece surface shot-peening, shot peening strength is
0.10A, coverage rate are 100%～200%.
(3) shot blasting on surface is processed
Piece surface adopts bead, from 0.70mm cast steel balls as blasting media, to piece surface shot-peening, shot-peening
Intensity is 0.10A, and coverage rate is 100%～200%.
(4) ungrease treatment
The enforcement of 2A12 machined parts processing method is pressed in part ungrease treatment.
(5) sulfur acid anodizing is processed
Piece surface anodization adopts sulfur acid anodizing technique, and technological parameter is：Sulfuric acid concentration be 150g/L～
250g/L, 20～25 DEG C of tank liquor temperature, oxidization time 28 minutes, 13～15V of oxidation voltage.
Embodiment 1
Table 1 is using operations such as machined-hole mechanical presses process-shot blasting on surface process-sulfur acid anodizings of the invention
Prepare part fatigue life effect.Wherein：
(1) hole is processed, and from the alloy steel rod of 0.3mm bigger than first hole, reinforcing makes to pass through in the hole on its part, so as to complete
The extruding of hole wall in pairs.Subsequently to extruding after hole hinge circle, and make which meet design drawing requirement.
(3) shot blasting on surface is processed
From 0.70mm cast steel balls as blasting media, to piece surface shot-peening, shot peening strength is 0.10A, and shot-peening is covered
Rate is 100%～200%.
(4) surface anodization is processed
Piece surface anodization adopts sulfur acid anodizing technique, and technological parameter is：Sulfuric acid concentration be 150g/L～
250g/L, 20～25 DEG C of tank liquor temperature, 13～15V of oxidation voltage, oxidization time 28 minutes.
1 invention practicable ways 1 of table make the contrast of different pore size part fatigue life improvement
Embodiment 2
Table 2 is to be prepared using operations such as machined-hole bead-shot blasting on surface process-sulfur acid anodizings of the invention
Part fatigue life effect.Wherein：
(1) hole is processed
From 0.70mm cast steel balls as blasting media, to hole wall bead, shot peening strength is 0.10A, and shot-peening is covered
Rate is 100%～200%.
(3) shot blasting on surface is processed
From 0.70mm cast steel balls as blasting media, to piece surface shot-peening, shot peening strength is 0.10A, and shot-peening is covered
Rate is 100%～200%.
(4) surface anodization is processed
Piece surface anodization adopts sulfur acid anodizing technique, and technological parameter is：Sulfuric acid concentration be 150g/L～
250g/L, 20～25 DEG C of tank liquor temperature, 13～15V of oxidation voltage, oxidization time 28 minutes.
2 invention practicable ways 2 of table make the contrast of part fatigue life improvement
Claims (1)
1. a kind of 2297-T87 aluminium lithium alloys aviation part sulfur acid anodizing pre-treating method, it is characterised in that the step of the method
Suddenly it is：
(1) part machinery processing
Aluminium lithium alloy slab is carried out machining by Element Design requirement, machining removal amount is not less than 3.0mm；
(2) hole is processed
No more than the hole of Φ 10mm adopts aperture extrusion process, crushed increscence amount to be not less than 0.15mm；Adopt in hole more than Φ 10mm
With bead, from 0.70mm cast steel balls as blasting media, to part hole wall surface shot-peening, shot peening strength is 0.10A, covers
Lid rate is 100%～200%；
(3) shot blasting on surface is processed
Piece surface adopts bead, from 0.70mm cast steel balls as blasting media, to piece surface shot-peening, shot peening strength
For 0.10A, coverage rate is 100%～200%；
(4) ungrease treatment
The enforcement of 2A12 machined parts processing method is pressed in part ungrease treatment；
(5) sulfur acid anodizing is processed
Piece surface anodization adopts sulfur acid anodizing technique, and technological parameter is：Sulfuric acid concentration is 150g/L～250g/L,
20～25 DEG C of tank liquor temperature, oxidization time 28 minutes, 13～15V of oxidation voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611115879.XA CN106498473A (en) | 2016-12-07 | 2016-12-07 | A kind of 2297 T87 aluminium lithium alloy aviation part sulfur acid anodizing pre-treating methods |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611115879.XA CN106498473A (en) | 2016-12-07 | 2016-12-07 | A kind of 2297 T87 aluminium lithium alloy aviation part sulfur acid anodizing pre-treating methods |
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| Publication Number | Publication Date |
|---|---|
| CN106498473A true CN106498473A (en) | 2017-03-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201611115879.XA Pending CN106498473A (en) | 2016-12-07 | 2016-12-07 | A kind of 2297 T87 aluminium lithium alloy aviation part sulfur acid anodizing pre-treating methods |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111434807A (en) * | 2019-01-15 | 2020-07-21 | 广东长盈精密技术有限公司 | Surface treatment method of aluminum alloy material and application thereof |
| CN111663163A (en) * | 2019-03-08 | 2020-09-15 | 核工业理化工程研究院 | Anticorrosion treatment method of 2A50 aluminum alloy and application thereof |
| CN113215634A (en) * | 2021-04-15 | 2021-08-06 | 中国航空制造技术研究院 | Method for improving corrosion resistance and fatigue resistance of aluminum alloy |
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| CN102517427A (en) * | 2011-12-16 | 2012-06-27 | 陕西飞机工业（集团）有限公司 | Device and method for reinforcing surfaces of assembly structural member holes |
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| CN111434807A (en) * | 2019-01-15 | 2020-07-21 | 广东长盈精密技术有限公司 | Surface treatment method of aluminum alloy material and application thereof |
| CN111663163A (en) * | 2019-03-08 | 2020-09-15 | 核工业理化工程研究院 | Anticorrosion treatment method of 2A50 aluminum alloy and application thereof |
| CN113215634A (en) * | 2021-04-15 | 2021-08-06 | 中国航空制造技术研究院 | Method for improving corrosion resistance and fatigue resistance of aluminum alloy |
| CN113215634B (en) * | 2021-04-15 | 2022-08-09 | 中国航空制造技术研究院 | Method for improving corrosion resistance and fatigue resistance of aluminum alloy |
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Application publication date: 20170315 |