CN109735837A - A kind of preparation method of aluminum alloy surface highly corrosion resistant zero waste water discharge - Google Patents
A kind of preparation method of aluminum alloy surface highly corrosion resistant zero waste water discharge Download PDFInfo
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Abstract
A kind of preparation method of aluminum alloy surface highly corrosion resistant zero waste water discharge, it is characterised in that: the following steps are included: (1) oil removing: using the C of 10g/L18H29NaO3S solution, is ultrasonically treated 2min by 20~38 DEG C of temperature；(2) it washes: washing 1min under ambient temperature；(3) chemical conversion；(4) it washes: washing 1min under ambient temperature；(5) it dries up: using 100~150 DEG C of hot blast dryings.The present invention has the advantage that simple process, strong operability, energy conservation and environmental protection, and coating of being painted or dusted in aluminum alloy surface is not needed, the same corrosion resistance of painting layer can be reached.If spraying one layer of varnish in rare earth chemistry conversion film surface, aluminum alloy surface not only has golden color, but also corrosion resistance will further enhance.
Description
Technical field
The present invention relates to field of metal surface treatment technology, and in particular to a kind of aluminum alloy surface highly corrosion resistant Chrome-free turn
Change the preparation method of film.
Background technique
Aluminum density is low, and intensity is high, is a kind of excellent lightweighting materials, has a large amount of application in aerospace field, but
In orthodox car field, dosage is little, and only the high-end vehicle in part has large-area applications.It is wanted with to automobilism dynamic economics
The raising asked, traditional vehicle enterprise start increasingly to pay attention to automotive light weight technology technology, and aluminium alloy is as the higher lightweight of cost performance
Material is widely used.Although aluminium is lower than iron density, its chemical property is more active, and corrosion resistance is poor, if not into
Row surface treatment, is difficult by large-area applications.It is traditional to Al-alloy parts surface treatment mode using anodizing technology,
Such as aircraft aluminum alloy outer cover, surface treatment are usually to carry out under stronger acid condition, and " hydrogen embrittlement " caused by acid etching is existing
As more apparent, not high, the rotproofness decline, according to pertinent literature, anodic oxidation that is formed by coating mass is inevitably resulted in
Film corrosion resistance does not all exceed 336h generally, if not spraying one layer of painting layer in anodic oxidation film surface, is difficult to meet
The corrosion resistance requirement of Al-alloy parts in the presence of a harsh environment.In auto parts and components, wheel aluminium alloy dosage is larger, traditional
Surface treatment mode is electroplating technology, and by taking aluminium wheels as an example, electroplating technology is as follows:
Aluminium wheels directly electroplating technology process: paraffin removal, washing, cathode oil removing, washing, weak corrosion, washing, scale removal, washing,
Nickel preplating, washing, copper facing, washing, semi-gloss nickel, high-sulfur nickel, bright nickel, nickel envelope, washing, chromium plating.
Aluminium wheels secondary soaking zinc electroplating technology process: paraffin removal, washing, cathode oil removing, washing, weak corrosion, washing, scale removal,
Washing, once heavy zinc, washing, dezincification, washing, secondary heavy zinc, washing, nickel preplating, washing, copper facing are washed, semi-bright nickel, high
Sulphur nickel, bright nickel, nickel envelope, washing, chromium plating.
Aluminium wheels flash chemical nickel process flow: weak corrosion, washing, scale removal are washed, activation, flash chemical nickel, washing,
Acid bright copper or other metals are plated in acid activation, washing.
Traditional plating, complex process, process is tedious, energy consumption is high, seriously polluted, and enterprise's production cost is high, a kind of performance
Excellent and low-cost aluminium alloy surface treatment method is urgently studied.
Summary of the invention
It is low in cost technical problem to be solved by the invention is to provide a kind of function admirable, it is based on 6061 aluminium alloy tables
The preparation method of face highly corrosion resistant zero waste water discharge.By a kind of environment-friendly type rare earth chemistry treatment fluid, to aluminum alloy surface into
Row oxidation processes obtain one layer of uniform golden yellow chemical composition coating, which has very excellent salt spray corrosion resistance,
By the continuous salt spray corrosion test of 1000h or more, aluminum alloy surface film layer is complete.
In order to solve the above technical problems, technical solution provided by the invention are as follows: a kind of aluminum alloy surface highly corrosion resistant without
The preparation method of chromium conversion film, it is characterised in that: the following steps are included:
(1) oil removing: using the C of 10g/L18H29NaO3S solution, is ultrasonically treated 2min by 20~38 DEG C of temperature；
(2) it washes: washing 1min under ambient temperature；
(3) chemical conversion: addition Ce (NO3)3·6H2O 3.0~9.6g/L, KMnO40.2~3.0g/L, NaF 0.2~
2.0g/L, CH3COOH 0~1mL, H3BO30~0.5g/L, pH:3~4, temperature: 20~45 DEG C, transformation time: 5~10min；
(4) it washes: washing 1min under ambient temperature
(5) it dries up: using 100~150 DEG C of hot blast dryings.
The present invention has the advantage that simple process, strong operability, energy conservation and environmental protection, and do not need in aluminum alloy surface
It is painted or is dusted coating, the same corrosion resistance of painting layer can be reached.If in the rare earth chemistry conversion film table
Face sprays one layer of varnish, then aluminum alloy surface not only has golden color, but also corrosion resistance will further enhance.
Specific embodiment
The present invention provides a kind of preparation method of aluminum alloy surface highly corrosion resistant zero waste water discharge, it is characterised in that: packet
Include following steps:
(1) oil removing: using the C of 10g/L18H29NaO3S solution, is ultrasonically treated 2min by 20~38 DEG C of temperature；
(2) it washes: washing 1min under ambient temperature；
(3) chemical conversion: addition Ce (NO3)3·6H2O 3.0~9.6g/L, KMnO40.2~3.0g/L, NaF 0.2~
2.0g/L, CH3COOH 0~1mL, H3BO30~0.5g/L, pH:3~4, temperature: 20~45 DEG C, transformation time: 5~10min；
(4) it washes: washing 1min under ambient temperature
(5) it dries up: using 100~150 DEG C of hot blast dryings.
The present invention once attempted to carry out grinding process to aluminum alloy surface before deoiling step when preparing conversion film, will
New aluminum alloy plate and useless plate surface successively pass through the sand paper of 300#, 500#, 1000# manual grinding step by step, using oil removing,
Chemical conversion treatment, since the plate surface after grinding process passes through physical friction, roughness decline, flatness reduces, causes
Superficial film after chemical conversion is uneven, and salt spray corrosion resistance is poor, less than 100h plate face i.e. occur a large amount of white rusts with
Nigrescence phenomenon.
And transpassivation processing is once attempted after chemical conversion steps, aluminum alloy surface rare earth film is carried out with molybdate blunt
Corrosion resistance can be improved after change, after trial carries out rare earth film layer with the mixed treating liquid of 10g/L ammonium molybdate+3g/L sodium fluoride
Reason, golden yellow film layer darken, and are in bronzing, more uniform, but corrosion resistance is poor, by continuous salt fog less than 200h plate
A large amount of white rusts and nigrescence phenomenon occur for face.Molybdate, can be by oxidized aluminum alloy as stronger oxidant, can also will be low
The rare-earth oxidation film of valence aoxidizes, while the oxide containing molybdenum for itself being reduced to low price is deposited on rare earth film surface, but molybdenum
Oxide salt spray corrosion resistance is far below rare earth chemistry conversion film.
When oil removal treatment, only mass percentage content is selected to make degreaser for 1% neopelex, because its
PH value is more moderate, and will not generate alkaline etching to aluminum alloy surface can achieve the effect that oil removing again.Once a certain amount of hydrogen-oxygen of addition was attempted
Change sodium as alkaline etching agent, since Sodium Hydroxide Alkaline is too strong, reaction is violent and fast speed, to the extent of corrosion of aluminium alloy plate compared with
Greatly, phenomena such as Yi Fasheng excessive erosion, such as generation blackspot, dimness, leads to the reduction of the plate face uniformity.Using mass percentage 10
After~20% dilute hydrochloric acid neutralizes, surface becomes bright again, but after postorder film process, superficial film is uneven, and
Salt spray corrosion resistance is poor.
The present invention turns the aluminum alloy rare earth of preparation after obtaining golden yellow uniform film layer after rare-earth conversion coatings are handled
Change film and vertical direction to be placed in Q, FOG salt spray test chamber in 20 ° ± 5 °, NaCl is dissolved in conductivity no more than 20 μ s/cm's
In deionized water, concentration is 50g/L ± 5g/L, adjusts the pH value of salting liquid, makes it between 6.5~7.2, is kept in chamber
35 DEG C ± 2 DEG C of temperature, salt fog sinking speed is every 80cm2It is 1~2mL/h on area.Sample is taken out after the test, in interior
0.5~1h is spontaneously dried, is then gently cleaned with the cleaning circulating water not higher than 40 DEG C to remove the remaining salt fog of specimen surface,
It is dried up immediately with hair dryer again.
The present invention has carried out ten groups of comparative experimentss, the specific steps are as follows:
Embodiment one
(1) oil removing: using the C of 10g/L18H29NaO3Temperature: S solution 23 DEG C, is ultrasonically treated 2min；
(2) it washes: washing 1min under ambient temperature；
(3) chemical conversion: main salt 3.0g/L, pH:3~4, temperature: 29 DEG C, transformation time: 5min；
(4) be passivated: temperature: room temperature closing, ammonium molybdate 4.0g/L+ sodium fluoride 1.0g/L 23 DEG C, are ultrasonically treated 10min；
(5) it washes: washing 1min under ambient temperature；
(6) it dries up: using 100~150 DEG C of hot blast dryings.
Embodiment two
(1) oil removing: using the C of 10g/L18H29NaO3Temperature: S solution 28 DEG C, is ultrasonically treated 2min；
(2) it washes: washing 1min under ambient temperature；
(3) chemical conversion: pH:3~4, temperature: 42 DEG C, transformation time: 5min；
(4) be passivated: temperature: room temperature closing, ammonium molybdate 4.0g/L+ sodium fluoride 1.0g/L 30 DEG C, are ultrasonically treated 15min；
(5) it washes: washing 1min under ambient temperature；
(6) it dries up: using 100~150 DEG C of hot blast dryings.
Embodiment three
(1) it polishes: surface is successively passed through to the sand paper of 300#, 500#, 1000# manual grinding step by step；
(2) oil removing: using the C18H29NaO3S solution of 10g/L, temperature: 30 DEG C, it is ultrasonically treated 5min；
(3) it washes: washing 1min under ambient temperature；
(4) chemical conversion: pH:3~4, temperature: 42 DEG C, transformation time: 5min；
(5) be passivated: temperature: room temperature closing, ammonium molybdate 4.0g/L+ sodium fluoride 1.0g/L 30 DEG C, are ultrasonically treated 15min；
(6) it washes: washing 1min under ambient temperature；
(7) it dries up: using 100~150 DEG C of hot blast dryings.
Example IV
(1) oil removing: using the C of 10g/L18H29NaO3Temperature: S solution 33 DEG C, is ultrasonically treated 2min；
(2) it washes: washing 1min under ambient temperature；
(3) chemical conversion: main salt 6.0g/L, pH:3~4, temperature: 43 DEG C, transformation time: 5min；
(4) be passivated: temperature: room temperature closing, ammonium molybdate 10.0g/L+ sodium fluoride 3.0g/L 34 DEG C, are ultrasonically treated 10min；
(5) it washes: washing 1min under ambient temperature；
(6) it dries up: using 100~150 DEG C of hot blast dryings.
Embodiment five
(1) oil removing: using the C of 10g/L18H29NaO3Temperature: S solution 34 DEG C, is ultrasonically treated 2min；
(2) it washes: washing 1min under ambient temperature；
(3) chemical conversion: pH:3~4, temperature: 43 DEG C, transformation time: 5min；
(4) be passivated: temperature: room temperature closing, ammonium molybdate 10.0g/L+ sodium fluoride 3.0g/L 34 DEG C, are ultrasonically treated 10min；
(5) it washes: washing 1min under ambient temperature；
(6) it dries up: using 100~150 DEG C of hot blast dryings.
Embodiment six
(1) oil removing: using the C of 10g/L18H29NaO3Temperature: S solution 34 DEG C, is ultrasonically treated 2min；
(2) it washes: washing 1min under ambient temperature；
(3) chemical conversion: main salt 9.6g/L+ potassium permanganate 0.4g/L, pH:3~4, temperature: 41 DEG C, transformation time:
5min；
(4) be passivated: temperature: room temperature closing, ammonium molybdate 10.0g/L+ sodium fluoride 3.0g/L 30 DEG C, are ultrasonically treated 15min；
(5) it washes: washing 1min under ambient temperature；
(6) it dries up: using 100~150 DEG C of hot blast dryings.
Embodiment seven
(1) oil removing: using the C of 10g/L18H29NaO3Temperature: S solution 35 DEG C, is ultrasonically treated 2min；
(2) it washes: washing 1min under ambient temperature；
(3) chemical conversion: main salt 9.6g/L+ potassium permanganate 0.9g/L+ sodium fluoride 0.2g/L, pH:3~4, temperature: 41 DEG C,
Transformation time: 5min；
(4) be passivated: temperature: room temperature closing, ammonium molybdate 4.0g/L+ sodium fluoride 1.0g/L 30 DEG C, are ultrasonically treated 15min；
(5) it washes: washing 1min under ambient temperature；
(6) it dries up: using 100~150 DEG C of hot blast dryings.
Embodiment eight
(1) oil removing: using the C of 10g/L18H29NaO3Temperature: S solution 36 DEG C, is ultrasonically treated 2min；
(2) it washes: washing 1min under ambient temperature；
(3) chemical conversion: main salt 9.6g/L+ potassium permanganate 0.9g/L+ sodium fluoride 0.2g/L, pH:3~4, temperature: 40 DEG C,
Transformation time: 5min；
(4) be passivated: temperature: room temperature closing, ammonium molybdate 4.0g/L+ sodium fluoride 1.0g/L 37 DEG C, are ultrasonically treated 10min；
(5) it washes: washing 1min under ambient temperature；
(6) it dries up: using 100~150 DEG C of hot blast dryings.
Embodiment nine
(1) oil removing: using the C of 10g/L18H29NaO3Temperature: S solution 36 DEG C, is ultrasonically treated 2min；
(2) it washes: washing 1min under ambient temperature；
(3) chemical conversion: main salt 9.6g/L+ potassium permanganate 0.9g/L+ sodium fluoride 0.2g/L, pH:3~4, temperature: 40 DEG C,
Transformation time: 5min；
(4) be passivated: temperature: room temperature closing, ammonium molybdate 10.0g/L+ sodium fluoride 3.0g/L 30 DEG C, are ultrasonically treated 15min；
(5) it washes: washing 1min under ambient temperature；
(6) it dries up: using 100~150 DEG C of hot blast dryings.
Embodiment ten
(1) oil removing: using the C of 10g/L18H29NaO3S solution, is ultrasonically treated 2min by 38 DEG C of temperature；
(2) it washes: washing 1min under ambient temperature；
(3) chemical conversion: Ce (NO3)3·6H2O 9.6g/L, KMnO40.9g/L, NaF 0.2g/L, pH:3~4, temperature:
40 DEG C, transformation time: 5min；
(4) it washes: washing 1min under ambient temperature
(5) it dries up: using 100~150 DEG C of hot blast dryings.
By the continuous salt spray test of 1848h, plate surface rare earth chemistry conversion film in embodiment ten and it is put into salt spray test
Appearance is basically unchanged before case, for golden yellow uniform film layer, only fragmentary several spot corrosion.Should experiments have shown that: manage at the surface
Under process conditions, aluminum alloy surface is capable of forming one layer of protective film complete, uniformly, fine and close, effectively prevents aluminium alloy base
Corrosion of the body by extraneous medium, greatly improves the corrosion resistance of aluminium alloy.
The present invention is suitable for: 1, vehicle；2, control unit/system；3, bodywork system；4, engine and related system；5,
Transmission gear shift running gear；6, chassis frame/suspension；7, steering/braking；8, electric；9, electric car；10, important life
Produce equipment/tool.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., is all included in the scope of protection of the present invention.
Claims (1)
1. a kind of preparation method of aluminum alloy surface highly corrosion resistant zero waste water discharge, it is characterised in that: the following steps are included:
(1) oil removing: using the C of 10g/L18H29NaO3S solution, is ultrasonically treated 2min by 20~38 DEG C of temperature；
(2) it washes: washing 1min under ambient temperature；
(3) chemical conversion: addition Ce (NO3)3·6H2O 3.0~9.6g/L, KMnO40.2~2.0g/ of 0.2~3.0g/L, NaF
L, CH3COOH 0~1mL, H3BO30~0.5g/L, pH:3~4, temperature: 20~45 DEG C, transformation time: 5~10min；
(4) it washes: washing 1min under ambient temperature；
(5) it dries up: using 100~150 DEG C of hot blast dryings.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114889225A (en) * | 2022-05-12 | 2022-08-12 | 浙江上承自动化科技有限公司 | Collision-resistant locking limiting block and blackening process thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104195540A (en) * | 2014-09-16 | 2014-12-10 | 朱忠良 | Rare earth salt passivation process of aluminum alloy |
| CN109402620A (en) * | 2017-08-17 | 2019-03-01 | 中国科学院金属研究所 | Aluminum alloy surface Chrome-free is anti-corrosion chemical composition coating film forming solution and film layer preparation method |
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2019
- 2019-03-19 CN CN201910205681.8A patent/CN109735837A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104195540A (en) * | 2014-09-16 | 2014-12-10 | 朱忠良 | Rare earth salt passivation process of aluminum alloy |
| CN109402620A (en) * | 2017-08-17 | 2019-03-01 | 中国科学院金属研究所 | Aluminum alloy surface Chrome-free is anti-corrosion chemical composition coating film forming solution and film layer preparation method |
Non-Patent Citations (3)
| Title |
|---|
| ZHANG JUNJUN ET AL.: ""Investigation of the Ce-Mn conversion coating on 6303 aluminium alloy"", 《CHINESE SCIENCE BULLETIN》 * |
| 张书第等: ""铝合金Ce-Mn转化膜的制备工艺研究"", 《电镀与环保》 * |
| 张凯: ""6063铝合金表面稀土转化膜工艺优化及溶液稳定性研究"", 《中国优秀硕士学位论文全文数据库 工程科技I辑》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114889225A (en) * | 2022-05-12 | 2022-08-12 | 浙江上承自动化科技有限公司 | Collision-resistant locking limiting block and blackening process thereof |
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