CN102808170A - Treating fluid for corrosion-resistant rare earth conversion film on surface of aluminum alloy, and application method thereof - Google Patents
Treating fluid for corrosion-resistant rare earth conversion film on surface of aluminum alloy, and application method thereof Download PDFInfo
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- CN102808170A CN102808170A CN2012102719975A CN201210271997A CN102808170A CN 102808170 A CN102808170 A CN 102808170A CN 2012102719975 A CN2012102719975 A CN 2012102719975A CN 201210271997 A CN201210271997 A CN 201210271997A CN 102808170 A CN102808170 A CN 102808170A
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Abstract
The invention discloses a treating fluid for corrosion-resistant rare earth conversion film on a surface of an aluminum alloy and an application method of the treating fluid. The treating fluid comprises the following components by weight: 10-40g of rare-earth salt, 120-400g sodium chloride and 12-45g sodium fluoride in each liter of distilled water. The rare-earth salt is cerium salt or lanthanum salt; the pH value of the treating fluid is 2-6, the treating temperature is 30 DEG C to 70 DEG C; the impregnation technology is used, namely an aluminum alloy workpiece is impregnated in the treating fluid for 40-70min and then is dried, so as to form the corrosion-resistant rare earth conversion film on the surface of the aluminum alloy, so that the corrosion resistance of the aluminum alloy can be enhanced greatly. Compared with other techniques, the method is simple in operation, is unlimited by the shape of the aluminum alloy workpiece, and is economical and environment-friendly.
Description
Technical field
The invention belongs to the aseptic technic field, particularly a kind of aluminum alloy surface corrosion-resistant rare-earth conversion film treatment solution and application method thereof of being used for.
Background technology
Physical propertys such as duraluminum has the intensity height, density is low, plasticity good, good electroconductibility and thermal conductivity have very wide application prospect at aspects such as building, communications and transportation, electronics, mover, scatterer and daily lifes.In the air, aluminum alloy surface can form alumina protective layer, alloy matrix aluminum is played a protective role, but the thickness of this tunic is merely about 4nm, and porosity is big, hardness is low, wear no resistance, be prone to be corroded.These shortcomings have seriously limited its range of application, and especially at moist atmosphere, seawater, marine atmosphere and contain in the environment such as industrial atmosphere particularly have Cl in these environment
-Very easily corrode when existing,, need carry out surface treatment aluminum alloy surface in order to improve the corrosion resistance nature of duraluminum.
Common aluminium alloy surface treatment method has anodize, chemical conversion film processing etc., but all there is bigger problem of environmental pollution in these methods.In recent years, rare-earth conversion coatings has been proved to be to replace the desired coating of with serious pollution chromate conversion coating, becomes domestic and international research focus.D.R.Amott adopts different rare-earth conversion coatings technical finesse aluminum alloy surface respectively with Mansfeld, but there is the long and high shortcoming of treatment temp of soak time respectively in these two kinds of technology.The patent of No. 91872 Shanghai institute of PLA " a kind of corrosive protection of aluminium alloy treatment process " (CN102358949); It adopts technique of brush plating to form rare earth nano titanium oxide composite film in aluminum alloy surface; Its technology receives the restriction of workpiece shape, is not suitable for complicated Al alloy parts.
Summary of the invention
The object of the invention; Be the problem of environmental pollution handled to anodize, chemical conversion film and prior art exist be not suitable for complex part, soak time is long and treatment temp is high problem; A kind of new aluminum alloy surface corrosion-resistant rare-earth conversion film treatment solution and application method thereof of being used for is provided, and this treatment solution does not contain strong oxidizer (like KMnO
4, H
2O
2, (NH
4)
2S
2O
8Deng), environment friendly and pollution-free, adopt impregnation technology, do not receive the Al alloy parts shape limits, the rare-earth conversion coatings of formation can significantly improve the Corrosion Protection of aluminum alloy surface.
A kind of aluminum alloy surface corrosion-resistant rare-earth conversion film treatment solution that is used for of the present invention, its material composition and content thereof are: add rare-earth salts 10～40g, sodium-chlor 120～400g, Sodium Fluoride 12～45g in every liter of zero(ppm) water;
The preparation method of above-mentioned rare-earth conversion coatings treatment solution is following:
(1) by adding rare-earth salts 10～40g in every liter of zero(ppm) water, sodium-chlor 120～400g, the metering ratio of Sodium Fluoride 12～45g takes by weighing rare-earth salts, sodium-chlor and Sodium Fluoride, places beaker, adds zero(ppm) water, and it is dissolved fully;
(2) drip in the above-mentioned treatment solution with 1mol/L Hydrogen chloride, adjustment is joined the pH value and is adjusted to 2～6, is warming up to 30～70 ℃.
Said rare-earth salts is Cerium II Chloride (CeCl
36H
2O), cerous nitrate (Ce (NO
3)
36H
2O), Lanthanum trinitrate (La (NO
3)
36H
2O) and Lanthanum trichloride (LaCl
37H
2O).
A kind of application method that is used for aluminum alloy surface corrosion-resistant rare-earth conversion film treatment solution of the present invention, step is:
(1) oil removing: Al alloy parts is hung, is dipped in 10min in the ethanol, remove the grease of aluminum alloy surface, and it is cleaned up with zero(ppm) water;
(2) activation: it is 35～70g/L that the duraluminum after step (1) handled is immersed in concentration, and temperature is activation 1～3min in 15～35 ℃ the sodium hydroxide solution, and with zero(ppm) water it is cleaned up;
(3) plated film: the duraluminum after step (2) processing is immersed in 40～70min in the rare-earth salt processing liquid, cleans up with zero(ppm) water afterwards,, can obtain rare-earth conversion coatings in aluminum alloy surface in 80～100 ℃ of dryings.
The invention has the beneficial effects as follows, a kind of new aluminum alloy surface corrosion-resistant rare-earth salt treatment solution that is used for is provided, can form rare-earth conversion coatings in aluminum alloy surface under the low temperature, technology is simple, and cost is low, environmental protection.
Embodiment
Below in conjunction with embodiment the present invention is done and to further describe.
Embodiment is raw materials used to be commercially available AR.
Embodiment 1
At first, preparation rare-earth conversion coatings treatment solution: beaker is cleaned up with zero(ppm) water, add 20g Cerium II Chloride, 240g sodium-chlor and 24g Sodium Fluoride, add zero(ppm) water 2L again.Drip 1mol/L Hydrogen chloride, the pH value of regulating treatment solution is 6, is warming up to 70 ℃.
It is following in the step that aluminum alloy surface forms rare-earth conversion coatings to use above-mentioned rare-earth conversion coatings treatment solution:
(1) aluminum alloy surface oil removal treatment: with Al alloy parts suspension, be immersed in that 10min carries out oil removal treatment in the ethanol, with zero(ppm) water it cleaned to clean afterwards.
(2) aluminum alloy surface activation treatment: beaker is cleaned up with zero(ppm) water, add 70g sodium hydroxide, add zero(ppm) water 2L again, dissolving and dilution stir, and temperature keeps 15 ℃.Step (1) aluminium alloy treated is immersed in above-mentioned sodium hydroxide dissolves middle activation.
(3) aluminum alloy surface plated film: with 40min in the Al alloy parts dipping rare-earth conversion coatings treatment solution after step (2) processing, clean up with zero(ppm) water afterwards, dry 30min under 80 ℃ can obtain rare-earth conversion coatings in aluminum alloy surface.
Embodiment 2
At first, preparation rare-earth conversion coatings treatment solution: beaker is cleaned up with zero(ppm) water, add 60g Cerium II Chloride, 500g sodium-chlor and 50g Sodium Fluoride, add zero(ppm) water 2L again.Drip 1mol/L Hydrogen chloride, the pH value of regulating treatment solution is 4, is warming up to 50 ℃.
It is following in the step that aluminum alloy surface forms rare-earth conversion coatings to use above-mentioned rare-earth conversion coatings treatment solution:
(1) aluminum alloy surface oil removal treatment: with Al alloy parts suspension, be immersed in that 10min carries out oil removal treatment in the ethanol, with zero(ppm) water it cleaned to clean afterwards.
(2) aluminum alloy surface activation treatment: beaker is cleaned up with zero(ppm) water, add 100g sodium hydroxide, add zero(ppm) water 2L again, dissolving and dilution stir, and temperature remains on 20 ℃.Step (1) aluminium alloy treated is immersed in above-mentioned sodium hydroxide dissolves middle activation.
(3) aluminum alloy surface plated film: with 50min in the Al alloy parts dipping rare-earth salt processing liquid after step (2) processing, clean up with zero(ppm) water afterwards, 90 ℃ of following dry 30min can obtain rare-earth conversion coatings in aluminum alloy surface again.
Embodiment 3
At first, preparation rare-earth conversion coatings treatment solution: beaker is cleaned up with zero(ppm) water, add 80g Cerium II Chloride, 800g sodium-chlor and 90g Sodium Fluoride, add zero(ppm) water 2L again.Drip 1mol/L Hydrogen chloride, the pH value of regulating treatment solution is 2, is warming up to 30 ℃.
It is following in the step that aluminum alloy surface forms rare-earth conversion coatings to use above-mentioned rare-earth conversion coatings treatment solution:
(1) aluminum alloy surface oil removal treatment: with Al alloy parts suspension, be immersed in that 10min carries out oil removal treatment in the ethanol, with zero(ppm) water it cleaned to clean afterwards.
(2) aluminum alloy surface activation treatment: beaker is cleaned up with zero(ppm) water, add 140g sodium hydroxide, add zero(ppm) water 2L again, dissolving and dilution stir, and temperature remains on 35 ℃.Step (1) aluminium alloy treated is immersed in above-mentioned sodium hydroxide dissolves middle activation.
(3) aluminum alloy surface plated film: with 70min in the Al alloy parts dipping rare-earth salt processing liquid after step (2) processing, clean up with zero(ppm) water afterwards, 100 ℃ of following dry 30min can obtain rare-earth conversion coatings in aluminum alloy surface again.
At last, the Al alloy parts of the foregoing description is carried out the Corrosion Protection quality examination, carry out neutral salt spray test according to GB10125-88 " corrosion test in the artificial atmosphere-(SS test)-neutral salt spray test ", the technical indicator of its detected result sees table 1 for details.
Table 1
Claims (3)
1. one kind is used for aluminum alloy surface corrosion-resistant rare-earth conversion film treatment solution, and its material composition and content thereof are: add rare-earth salts 10～40g, sodium-chlor 120～400g, Sodium Fluoride 12～45g in every liter of zero(ppm) water.
The preparation method of above-mentioned rare-earth conversion coatings treatment solution is following:
(1) by adding rare-earth salts 10～40g in every liter of zero(ppm) water, sodium-chlor 120～400g, the metering ratio of Sodium Fluoride 12～45g takes by weighing rare-earth salts, sodium-chlor and Sodium Fluoride, places beaker, adds zero(ppm) water, and it is dissolved fully;
(2) drip in the above-mentioned treatment solution with 1mol/L Hydrogen chloride, regulate pH value to 2～6, be warming up to 30～70 ℃.
2. according to a kind of aluminum alloy surface corrosion-resistant rare-earth conversion film treatment solution that is used for of claim 1, it is characterized in that said rare-earth salts is Cerium II Chloride, cerous nitrate, Lanthanum trinitrate and Lanthanum trichloride.
3. a kind of application method that is used for aluminum alloy surface corrosion-resistant rare-earth conversion film treatment solution of claim 1, step is:
(1) oil removing: Al alloy parts is hung, is dipped in 10min in the ethanol, remove the grease on Al alloy parts surface, and it is cleaned up with zero(ppm) water;
(2) activation: it is that 35～70g/L, temperature are activation 1～3min in 15～35 ℃ the sodium hydroxide solution that the Al alloy parts after step (1) handled is immersed in concentration, and with zero(ppm) water it is cleaned up;
(3) plated film: the duraluminum after step (2) processing is immersed in 40～70min in the rare-earth salt processing liquid, cleans up with zero(ppm) water afterwards,, can obtain rare-earth conversion coatings in aluminum alloy surface in 80～100 ℃ of dryings.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104131305A (en) * | 2014-08-20 | 2014-11-05 | 山东威达机械股份有限公司 | Pre-treating fluid for surface corrosion protection of zinc (or aluminium) alloy die castings |
| CN105200418A (en) * | 2015-10-14 | 2015-12-30 | 裴秀琴 | Preparation method of aluminum alloy with lanthanum corrosion-resistant film |
| CN105220139A (en) * | 2015-10-14 | 2016-01-06 | 裴秀琴 | A kind of preparation method with the aluminium alloy of cobalt corrosion-resisting film |
| CN105274515A (en) * | 2015-10-14 | 2016-01-27 | 裴秀琴 | Preparation method of aluminum alloy with indium anti-corrosion film |
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|---|---|---|---|---|
| CN101260521A (en) * | 2008-04-21 | 2008-09-10 | 华南理工大学 | Aluminum alloy surface rare earth chemical conversion treatment method |
| JP2009079252A (en) * | 2007-09-26 | 2009-04-16 | Furukawa Sky Kk | Non-chromium type aluminum alloy plate chemical-converted material, and its coated material |
| CN101892477A (en) * | 2010-06-21 | 2010-11-24 | 华南理工大学 | Treatment solution for preparing aluminum alloy surface amorphous composite passivation film, preparation method and application |
| CN102234800A (en) * | 2011-07-27 | 2011-11-09 | 华南理工大学 | Aluminum alloy rare earth passivating liquid taking chlorine salt as accelerator and use method thereof |
-
2012
- 2012-08-01 CN CN2012102719975A patent/CN102808170A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009079252A (en) * | 2007-09-26 | 2009-04-16 | Furukawa Sky Kk | Non-chromium type aluminum alloy plate chemical-converted material, and its coated material |
| CN101260521A (en) * | 2008-04-21 | 2008-09-10 | 华南理工大学 | Aluminum alloy surface rare earth chemical conversion treatment method |
| CN101892477A (en) * | 2010-06-21 | 2010-11-24 | 华南理工大学 | Treatment solution for preparing aluminum alloy surface amorphous composite passivation film, preparation method and application |
| CN102234800A (en) * | 2011-07-27 | 2011-11-09 | 华南理工大学 | Aluminum alloy rare earth passivating liquid taking chlorine salt as accelerator and use method thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104131305A (en) * | 2014-08-20 | 2014-11-05 | 山东威达机械股份有限公司 | Pre-treating fluid for surface corrosion protection of zinc (or aluminium) alloy die castings |
| CN105200418A (en) * | 2015-10-14 | 2015-12-30 | 裴秀琴 | Preparation method of aluminum alloy with lanthanum corrosion-resistant film |
| CN105220139A (en) * | 2015-10-14 | 2016-01-06 | 裴秀琴 | A kind of preparation method with the aluminium alloy of cobalt corrosion-resisting film |
| CN105274515A (en) * | 2015-10-14 | 2016-01-27 | 裴秀琴 | Preparation method of aluminum alloy with indium anti-corrosion film |
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Application publication date: 20121205 |