CN106591906A - Chrome plating technology for cross type shaft - Google Patents
Chrome plating technology for cross type shaft Download PDFInfo
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- CN106591906A CN106591906A CN201610931412.6A CN201610931412A CN106591906A CN 106591906 A CN106591906 A CN 106591906A CN 201610931412 A CN201610931412 A CN 201610931412A CN 106591906 A CN106591906 A CN 106591906A
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- Prior art keywords
- plating
- oil removing
- pickling
- profile shaft
- cross profile
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Classifications
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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
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/18—Electroplating using modulated, pulsed or reversing current
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/04—Electroplating: Baths therefor from solutions of chromium
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electroplating Methods And Accessories (AREA)
Abstract
The invention relates to chrome plating technology for a cross type shaft. The technology comprises the following steps: dimension inspection, electrolytic degreasing, wiping degreasing, pickling, preheating, reverse corrosion, impact and electroplating, common electroplate and dimension inspection. The technology can effectively solve the problem of chrome plating limitation of special shaped parts, improve guiding precision of engines, and has very important values for chrome plating of special-shaped shaft.
Description
Technical field
The present invention relates to space product engine pack chrome-faced technology, more particularly to a kind of film forming is uniform, stable
Cross profile shaft chrome-plated process.
Background technology
Cross profile shaft is certain h type engine h component important component part, and cross profile shaft can realize three-dimensional beat, is risen
To guide effect.To ensure that its each axle coupling assembly can realize flexible rotating, four axis bodies have carried out chromium plating operation, are realizing
The wearability of axle is improve on the basis of luminosity, the whole synthesis performance of cross profile shaft is improved.
Cross profile shaft is special due to shape, and plating thickness often occurs in the head and root of four axles during chromium plating is carried out
Degree inequality causes the problem of dimension overproof.Existing processing method is to carry out mechanical grinding after chromium plating, due to being difficult in bruting process
The problem that datum level often results in dimension overproof is found, guiding accuracy is reduced, the quality of product is affected, such as accuracy value can be direct
Rocket engine propulsion track is affected, the research of cross profile shaft chrome-plated process is particularly significant.
The content of the invention
The present invention is directed to above-mentioned problems of the prior art, there is provided a kind of cross profile shaft chrome-plated process, solves
The problem of cross profile shaft chromium plating lack of homogeneity in prior art, especially achieves effective control to special-shaped axis class coating uniformity.
Technical scheme comprises the steps：
Step 1, dimensional gaughing：Dimensional gaughing is carried out to plating piece, part checks that precision need to reach 0.001；
Step 2, electrolytic degreasing：Plating piece after above-mentioned dimensional gaughing is carried out into electrolytic degreasing, part is immersed into degreasing tank
In liquid, being passed through positive and negative electrode electric current carries out oil removing operation；Piece surface is not allow for dirt after oil removing, and piece surface needs to keep
30 seconds continuous water-break-free to split；
Step 3, wiping oil removing：Plating piece after above-mentioned electrolytic degreasing is carried out into wiping oil removing, piece surface is needed after oil removing
Kept for 30 seconds continuous water-break-free splitting；
Step 4, pickling：Plating piece after above-mentioned wiping oil removing is carried out into pickling, surface is not allow for corrosion after pickling；
Step 5, preheating：Plating piece after above-mentioned pickling is preheated, is incubated in the warm water that part is immersed 50-60 DEG C
5-10min；
Step 6, anti-erosion：Etch process is carried out using the plating piece after above-mentioned preheating as anode, plating piece surface nature is made
The oxide-film of formation dissolves under electrochemical state, so as to play a part of roughening, activation；Anti- erosion electric current is 20-40A/dm2,
The anti-erosion time is 30-90s；
Step 7, impact plating：Plating piece after above-mentioned anti-erosion is carried out into impact plating, dash current using dash current
For 80-120/dm2, electroplating time have selected altogether as 3-7 minutes；
Step 8, conventional plating：Plating piece after above-mentioned impact is electroplated carries out conventional plating, and conventional electroplating current is 45-
60A/dm2, electroplating time is 20-30 minutes；
Step 9, dimensional gaughing：Plating piece after above-mentioned impact is electroplated carries out dimensional gaughing, obtains finished product.
In described step 6, anti-erosion electric current is preferably 30A/dm2, and the anti-erosion time is preferably 60s.
In described step 7, dash current is preferably 100A/dm2, and electroplating time is preferably 5min.
In described step 8, conventional current is preferably (50-55) A/dm2, and electroplating time is preferably 25min.
In described step 7 and step 8, chromium plating tank liquor temperature is 55 DEG C.
In described step 7 and step 8, anode puts across.
In described step 7 and step 8, auxiliary cathode is had additional, face size and the axle of auxiliary cathode match.
Advantages of the present invention effect is as follows：
By present invention process, special-shaped part chromium plating plating uniformity has obtained effective control, Jing technical arrangement plans
Test 27 test specimens altogether afterwards, coating dimensional accuracy≤0.01mm meets general requirement.Studied by the chromium plating of cross profile shaft, not only
The circumscribed problem of special-shaped part chromium plating is effectively solved, the guiding accuracy of engine is more improve, for the plating of special-shaped axis class
Chromium has highly important value.
By design fixture, adjustment anode and part distribution, realize that electric force lines distribution is uniform during plating.By applying
Plating parameter carries out technique adjustment with reference to the characteristics of cross profile shaft, it is ensured that the top of four axles and root are uniform by plating, so as to ensure
Coating is uniform, realizes the requirement of the dimensional accuracy of product.
Description of the drawings
Fig. 1 a put schematic diagram for in-line anode.
Fig. 1 b put schematic diagram for cross anode.
Fig. 2 a are auxiliary electrode structure schematic diagram of the present invention.
Fig. 2 b are comparative example auxiliary electrode structure schematic diagram.
Fig. 3 a are auxiliary electrode assembling structure schematic diagram of the present invention.
Fig. 3 b are comparative example auxiliary electrode assembling structure schematic diagram.
In figure, 1, test specimen；2nd, anode；3rd, power line.
Specific embodiment
Embodiment 1
Technical scheme comprises the steps：
Step 1, dimensional gaughing：Dimensional gaughing is carried out to plating piece, part checks that precision need to reach 0.001；
Step 2, electrolytic degreasing：Plating piece after above-mentioned dimensional gaughing is carried out into electrolytic degreasing, part is immersed into degreasing tank
In liquid, being passed through positive and negative electrode electric current carries out oil removing operation.Piece surface is not allow for dirt after oil removing, and piece surface needs to keep
30 seconds continuous water-break-free to split；Degreasing parameters:First negative electrode oil removing (5～10) min, rear anode oil removing (1～5) min, temperature (60
～90) DEG C, current density：5～10) A/dm2；
Step 3, wiping oil removing：Plating piece after above-mentioned electrolytic degreasing is carried out into wiping oil removing, piece surface is needed after oil removing
Kept for 30 seconds continuous water-break-free splitting；Degreasing parameters：Oil removing time (10～15) min temperature (40～60) DEG C；
Step 4, pickling：Plating piece after above-mentioned wiping oil removing is carried out into pickling, surface is not allow for corrosion after pickling；Acid
Temperature is washed for room temperature, time：(0.5～3) min, hydrochloric acid HCl：If 450g/L fourths：(3～5) g/L；
Step 5, preheating：Plating piece after above-mentioned pickling is preheated, is incubated in the warm water that part is immersed 50-60 DEG C
5-10min；
Step 6, anti-erosion：Etch process is carried out using the plating piece after above-mentioned preheating as anode, plating piece surface nature is made
The oxide-film of formation dissolves under electrochemical state, so as to play a part of roughening, activation；Anti- erosion electric current is 30A/dm2, anti-erosion
Time is 60s；
Step 7, impact plating：Plating piece after above-mentioned anti-erosion is carried out into impact plating, dash current using dash current
For 100/dm2, electroplating time have selected altogether as 5 minutes；
Step 8, conventional plating：Plating piece after above-mentioned impact is electroplated carries out conventional plating, and conventional electroplating current is
55A/dm2, electroplating time is 25 minutes；
Step 9, dimensional gaughing：Plating piece after above-mentioned impact is electroplated carries out dimensional gaughing, obtains finished product.
In described step 7 and step 8, chromium plating tank liquor temperature is 55 DEG C；Anode puts across；Have additional auxiliary cloudy
Pole, face size and the axle of auxiliary cathode match.
Embodiment 2
Described anti-erosion electric current is 20A/dm2, and the anti-erosion time is 90s；Dash current is 80/dm2, and electroplating time is selected altogether
It is 7 minutes；Conventional electroplating current is 45A/dm2, and electroplating time is 30 minutes；Other steps are with embodiment 1.
Embodiment 3
Described anti-erosion electric current is 40A/dm2, and the anti-erosion time is 30s；Dash current is 120/dm2, and electroplating time is selected altogether
Select as 3 minutes；Conventional electroplating current is 60A/dm2, and electroplating time is 20 minutes；Other steps are with embodiment 1.
The determination of parameter of the present invention：
1st, temperature：Chromium plating tank liquor temperature is larger for the impact of coating, because the main component of tank liquor is sulfuric acid and chromic anhydride,
The too low tank liquor of temperature is difficult deposition in blunt too chromium, and the too high Jing sulfuric acid of temperature is corroded in active state film forming, Jing tests
Change as follows as temperature increases film layer apparent condition：
40-45 DEG C of lead → 50-55 DEG C of light (normal) → 60-65 DEG C of milky
By above-mentioned test chromium plating temperature at 55 DEG C, plating effect is preferable.
2nd, anti-erosion, anti-erosion electric current have selected altogether 20A/dm2,30A/dm2,40A/dm2 in test, the time have chosen altogether 30s,
60s, 90s, test effect is shown in Table 1, by above-mentioned test it is counter lose parameter for 30A/dm2,60s when plating effect it is best.
3rd, impact plating, cross axle chromium plating is special due to shape, and chromium plating operation should use dash current.Select altogether during test
80A/dm2,100A/dm2,120/dm2 electric current is selected as dash current, the time have selected altogether 3 minutes, 5 minutes, 7 minutes, tried
Test and the results are shown in Table 2, by above-mentioned test dash current parameter be 100A/dm2,5min when plating effect it is best.
4th, conventional plating, the given electroplating parameter of conventional plating directly affects the effect of electroplated component, selects during test
45A/dm2,50A/dm2,55A/dm2,60A/dm2, the time have selected altogether 20 minutes, 25 minutes, 30 minutes, and result of the test is shown in Table
3, by above-mentioned test dash current parameter be (50-55) A/dm2,25min when plating effect it is best.
5th, anode and cathode position, the uniformity of general chromium coating thickness depends on the correlation of anode and plating piece.Usual feelings
Under condition, anode is nearer with the spacing of plating piece, and chromium coating more can be consistent with the geometry of plating piece.But, when anode and plating piece
When external diameter is dissimilar, if increase anode and the spacing of plating piece, can make electric current distribution uniform on the anode surface；If positive
Pole is too near with the spacing of plating piece, then CURRENT DISTRIBUTION is uneven on the contrary.Selective two ways in test, particular location is shown in figure
Two kinds of disposing ways of 1a, Fig. 1 b, Jing Experimental Comparison：Yi word pattern film layer tip is rougher, and cross film layer tip is more uniform.One word
Type anode is put, and because Anode-cathode Distance is nearer, and power line is uneven, easily causes film layer tip coarse；Cross anode is put
Put, electric force lines distribution is uniform, and film deposition is uniform.
6th, auxiliary cathode
It is coarse to solve the problems, such as the film layer that point discharge is caused, auxiliary cathode is devised, auxiliary cathode have chosen altogether two
Kind of structure, as shown in Fig. 2 a, Fig. 2 b, auxiliary cathode be installed after schematic diagram such as Fig. 3 a, Fig. 3 b, test by contrast draws, auxiliary the moon
Effect is better than B after pole A plating.Larger the easily causing during plating of auxiliary cathode B face area is blocked, and causes shield portions
And axle root local is without film layer, although solve coating tip problem of rough but bring the defect without film layer；Auxiliary cathode A
Moderate size, had both served the problem for avoiding tip coarse and in turn ensure that film layer was complete, met technological requirement.
Conclusion：By technical arrangement plan, the improvement of anode and cathode clamping position, the increase of auxiliary cathode, cross shaft size
Overproof problem has obtained effective control, realizes cross axle chrome-plated process, have cured technological parameter, and specific process parameter is such as
Under, 55 DEG C of chromium plating temperature；Anti- erosion：30A/dm2,30s；Impact plating：100A/dm2、5min；Conventional plating：(50-55)A/
dm2、25min；Anode and cathode is put：Cross；The face size of auxiliary cathode matches with axle.
Table 1
Note：Preferably, the rest may be inferred for B, C, D (A, B level can meet chromium plating requirement) for A levels effect
Table 2
Note：Preferably, the rest may be inferred for B, C, D (A, B level can meet chromium plating requirement) for A levels effect
Table 3
Note：Preferably, the rest may be inferred for B, C, D (A, B level can meet chromium plating requirement) for A levels effect.
Claims (10)
1. cross profile shaft chrome-plated process, it is characterised in that comprise the steps：
Step 1, dimensional gaughing：Dimensional gaughing is carried out to plating piece, part checks that precision need to reach 0.001；
Step 2, electrolytic degreasing：Plating piece after above-mentioned dimensional gaughing is carried out into electrolytic degreasing, part is immersed in oil removing tank liquor,
Being passed through positive and negative electrode electric current carries out oil removing operation；Piece surface is not allow for dirt after oil removing, and piece surface need to keep 30 seconds even
Continue water-break-free splitting；
Step 3, wiping oil removing：Plating piece after above-mentioned electrolytic degreasing is carried out into wiping oil removing, piece surface needs to keep after oil removing
30 seconds continuous water-break-free to split；
Step 4, pickling：Plating piece after above-mentioned wiping oil removing is carried out into pickling, surface is not allow for corrosion after pickling；
Step 5, preheating：Plating piece after above-mentioned pickling is preheated, in the warm water that part is immersed 50-60 DEG C 5- is incubated
10min；
Step 6, anti-erosion：Etch process is carried out using the plating piece after above-mentioned preheating as anode, plating piece surface self-assembling formation is made
Oxide-film dissolve under electrochemical state, so as to play a part of roughening, activation；Anti- erosion electric current is 20-40A/dm2, anti-erosion
Time is 30-90s；
Step 7, impact plating：Plating piece after above-mentioned anti-erosion is carried out into impact plating using dash current, dash current is 80-
120/dm2, electroplating time have selected altogether as 3-7 minutes；
Step 8, conventional plating：Plating piece after above-mentioned impact is electroplated carries out conventional plating, and conventional electroplating current is 45-60
A/dm2, electroplating time is 20-30 minutes；
Step 9, dimensional gaughing：Plating piece after above-mentioned impact is electroplated carries out dimensional gaughing, obtains finished product.
2. cross profile shaft chrome-plated process according to claim 1, it is characterised in that in described step 6, anti-erosion electric current is excellent
Elect 30A/dm2 as, the anti-erosion time is preferably 60s.
3. cross profile shaft chrome-plated process according to claim 1, it is characterised in that in described step 7, dash current is excellent
Elect 100 A/dm2 as, electroplating time is preferably 5min.
4. cross profile shaft chrome-plated process according to claim 1, it is characterised in that in described step 8, conventional current is excellent
Elect (50-55) A/dm2 as, electroplating time is preferably 25min.
5. cross profile shaft chrome-plated process according to claim 1, it is characterised in that in described step 7 and step 8, chromium plating
Tank liquor temperature is 55 DEG C.
6. cross profile shaft chrome-plated process according to claim 1, it is characterised in that in described step 7 and step 8, anode
Put across.
7. cross profile shaft chrome-plated process according to claim 1, it is characterised in that in described step 7 and step 8, set up
Face size and the axle for having auxiliary cathode, auxiliary cathode matches.
8. cross profile shaft chrome-plated process according to claim 1, it is characterised in that in described step 2, first negative electrode oil removing
（5～10）Min, rear anode oil removing（1～5）Min, temperature is 60～90 DEG C, and current density is（5～10）A/dm2 .
9. cross profile shaft chrome-plated process according to claim 1, it is characterised in that in described step 3, oil removing time 10
～15min, 40～60 DEG C of temperature.
10. cross profile shaft chrome-plated process according to claim 1, it is characterised in that in described step 4, pickling temperature is
Room temperature, 0.5～3min of pickling time, hydrochloric acid HCl used by pickling are 450 g/L；If fourth used by pickling is（3～5）g/L.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610931412.6A CN106591906A (en) | 2016-10-31 | 2016-10-31 | Chrome plating technology for cross type shaft |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610931412.6A CN106591906A (en) | 2016-10-31 | 2016-10-31 | Chrome plating technology for cross type shaft |
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| CN201610931412.6A Pending CN106591906A (en) | 2016-10-31 | 2016-10-31 | Chrome plating technology for cross type shaft |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109321902A (en) * | 2018-09-30 | 2019-02-12 | 中国人民解放军第五七九工厂 | A kind of method of powder metallurgy high-temperature alloy electrodeposited chromium |
| CN113235142A (en) * | 2021-03-31 | 2021-08-10 | 成都飞机工业（集团）有限责任公司 | Method for plating chromium on outer surface of undercarriage and chromium plating tool |
| CN113430604A (en) * | 2021-06-24 | 2021-09-24 | 中国航发中传机械有限公司 | Method for uniformly plating hard chromium on surface of GH4169 conical block gasket |
| CN114108045A (en) * | 2021-12-17 | 2022-03-01 | 南通申海工业科技有限公司 | Cross-shaped guide groove chromium plating process |
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| CN105755511A (en) * | 2016-04-11 | 2016-07-13 | 哈尔滨电气动力装备有限公司 | Shaft sleeve surface treatment method for water-lubricated bearing |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109321902A (en) * | 2018-09-30 | 2019-02-12 | 中国人民解放军第五七九工厂 | A kind of method of powder metallurgy high-temperature alloy electrodeposited chromium |
| CN109321902B (en) * | 2018-09-30 | 2020-12-11 | 中国人民解放军第五七一九工厂 | Method for electroplating chromium on powder metallurgy high-temperature alloy |
| CN113235142A (en) * | 2021-03-31 | 2021-08-10 | 成都飞机工业（集团）有限责任公司 | Method for plating chromium on outer surface of undercarriage and chromium plating tool |
| CN113235142B (en) * | 2021-03-31 | 2022-05-06 | 成都飞机工业（集团）有限责任公司 | Method for plating chromium on outer surface of undercarriage and chromium plating tool |
| CN113430604A (en) * | 2021-06-24 | 2021-09-24 | 中国航发中传机械有限公司 | Method for uniformly plating hard chromium on surface of GH4169 conical block gasket |
| CN114108045A (en) * | 2021-12-17 | 2022-03-01 | 南通申海工业科技有限公司 | Cross-shaped guide groove chromium plating process |
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Application publication date: 20170426 |