CN1302154C - Stripping liquid for aluminum silicon infiltration layer on the surface of high-temperature alloy and its application method - Google Patents
Stripping liquid for aluminum silicon infiltration layer on the surface of high-temperature alloy and its application method Download PDFInfo
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- CN1302154C CN1302154C CNB200410087557XA CN200410087557A CN1302154C CN 1302154 C CN1302154 C CN 1302154C CN B200410087557X A CNB200410087557X A CN B200410087557XA CN 200410087557 A CN200410087557 A CN 200410087557A CN 1302154 C CN1302154 C CN 1302154C
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Abstract
The present invention relates to a stripping liquid for an aluminum silicon infiltration layer on the surface of high-temperature alloy and an application method. The stripping liquid comprises120 to 180 g/L of hydrochloric acid, 6.0 to 8.0 g/L of combined additives and the balance of water, wherein the components of the combined additives comprise (by weight): 30% of 4-methylimidazole and 70% of hexamethylene tetramine. The application method of the stripping liquid comprises: heating the prepared stripping liquid to be 50 to 60 DEG C; soaking a part of which an aluminum silicon infiltration layer needs to be removed in the stripping liquid for 60 to 80 min; carrying out air agitation every 8 to 10 min and taking the part out for 1 to 3 times in the soaking process; removing dust formed on a surface layer. Thus, base materials are all exposed, and components and parts can not generate an over corrosion phenomenon for 4 hours in the stripping liquid. The present invention has the advantages of simple technology, strong operability, great reduction of repairing cost, and environmental pollution reduction.
Description
Technical field
The present invention relates to a kind of removal liquid and application method thereof of high-temperature alloy surface aluminum silicon infiltration layer.
Background technology
Therefore in recent years, the Xian Jin machine of advocating war thrust-weight ratio is increasing in the world, requires the performance of the resistance to high temperature oxidation of engine thermal end pieces and heat and corrosion resistant also more and more higher.The low-pressure turbine of engine particularly, the high and low pressure stator blade has adopted a kind of new safeguard procedures---fuse type aluminising silicon technology.This aluminium about 25%, siliceous 2% that in the aluminum silicon infiltration layer of 1000 ℃ of vacuum heat diffusion, contains.The main protective tissue that forms is β-NiAl phase, and relevant pyrolytic decomposition experimental study shows, the heat effect of experience 5000h under 900 ℃ of temperature, and the amount that NiAl decomposes mutually is almost nil, illustrates that infiltration layer has goodish barrier propterty.
In order to prolong the work-ing life of above-mentioned blade, in the prior art the local damaged blade of aluminum silicon infiltration layer adopted and remove and the way of infiltration layer again.Its concrete practice is: the one, and to the method for the damaged blade employing local mechanical rubbing down in aluminum silicon infiltration layer part.Though this removal method can be removed the part infiltration layer, but exist tangible remaining infiltration layer transition zone, carrying out the part when heavily oozing, the regional thick 5 μ m that the aluminum silicon infiltration layer of transition zone can newly ooze, and when life-time service and once more High temperature diffusion were heavily oozed, the β-Ni-Al that plays protection (resistance to high temperature oxidation) effect in the original aluminum silicon infiltration layer of the blade concentration of middle metallic aluminium mutually can be reduced to 10% from 28%.The resistance to high temperature oxidation of infiltration layer and corrosion and heat resistant ability obviously descend, and infiltration layer can produce be full of cracks or partial taking off again oozed; The 2nd, existing in the world at present employing chemistry is removed aluminum silicon infiltration layer, and then weighs the method for infiltration layer.Adopt this method, at first will match the removal liquid of removal aluminum silicon infiltration layer.Remove С Д П-2 coating process as Russia's " Sa Liute factory is about the reparation of the defeated blade protection layer of turbine "; remove liquid and be by nitric acid, hydrofluoric acid, iron powder formulated; and remove В С Д П-11 coating process, remove liquid and be by nitric acid, hydrofluoric acid, chromic anhydride formulated.Remove liquid when removing infiltration layer for above-mentioned two kinds, though can both remove the thermodiffusion aluminum silicon infiltration layer, but the excessive erosion to body material is quite difficult control, particularly when alloying layer thickness differs greatly, thicker infiltration layer is not also thoroughly removed, local thin local matrix appears, very easily causes the matrix excessive erosion.At present, related both at home and abroad removing superalloy all kinds of are coated with, the infiltration layer prescription all adopted nitric acid, hydrofluoric acid, chromic oxide.In application, not only easily cause the matrix excessive erosion, and environment is caused serious destruction, also increased " three wastes " intractability.
Summary of the invention
The objective of the invention is in order to overcome the defective that prior art exists, a kind of new removal liquid that does not contain compositions such as nitric acid, hydrofluoric acid, chromic oxide is determined in development, not only can thoroughly remove the aluminum silicon infiltration layer of blade remnants, and the excessive erosion phenomenon did not take place in 4 hours in body material in corrosive fluid, it is simple to reach technology, workable, can reduce repair cost significantly, reduce pollution simultaneously to environment.
The technical scheme that realizes the object of the invention is: develop a kind of removal liquid that is used to remove aluminum silicon infiltration layer, its moiety is:
Hydrochloric acid: 120～180g/L, combined additive: 6.0～8.0g/L, all the other are: water.
Combined additive is to be formed by 4-methylimidazole and vulkacit H (two kinds of chemical substances are the commercially available prod) assembly, and its weight proportion is a 4-methylimidazole: vulkacit H is=30%: 70%.
The application method of removing liquid is: at first form the proportioning preparation by above-mentioned removal liquid and remove liquid, will have high-temperature alloy surface aluminium silicon thermodiffusion infiltration layer parts and be immersed in wherein, heated solution, controlled temperature are 50～60 ℃, and soak time is 60～80min; Therebetween will be discontinuously stir and discontinuously parts are taken out solution, remove the floating ash that the surface forms with wind.
Above-mentioned parts are to carry out a wind every 8～10min to stir in immersion process; In immersion process, from solution, take out 1～3 time simultaneously, remove the floating ash that the components list aspect forms.
Remove in the liquid application process, the preferred composition proportioning of removing liquid is: hydrochloric acid 150g/L, and combined additive 7g/L, all the other are water.Solution temperature is controlled preferred 56 ℃.
Compared with the prior art, its outstanding feature of the present invention and the useful effect of generation are:
1) do not contain chromic anhydride in the technical recipe, hydrofluoric acid etc. have the composition of very big destruction to environment, have overcome nitric acid, hydrofluoric acid is volatile, and concentration is wayward, and matrix excessive erosion very easily takes place and drawback such as scraps.
2) 50～60min can remove 20～45 μ m aluminum silicon infiltration layers on the nickel base superalloy fully; Body material soaks in this removal liquid and did not produce the excessive erosion phenomenon in 4 hours.Because technology is simple, tank liquor is easy to control during production, and is workable.Needn't dissect part devastatingly, reduce the engine overhaul cost significantly.Can be used for the removal of aluminum silicon infiltration layer on low-pressure turbine blade, the combined high and low pressure stator blade.
3) this removal liquid (hydrochloric acid+combined additive) and the method used thereof in removing the infiltration layer process, have no adverse effects to the mechanical property of matrix.
4) the present invention can produce effective erosion action, its reason except with remove outside the Pass infiltration layer solution and parameter select rationally to have, removing in the liquid preparation has combined additive this is important breakthrough of the present invention.In moving back layer process, after body material part or whole exposing, combined additive can be adsorbed on matrix surface immediately matrix is played inhibition, passivation.The additive of two components is significantly improved than single additive corrosion mitigating effect, mainly is because synergy has taken place between the two.The temperature of control removal liquid also is important technology feature of the present invention effectively in addition.Particularly at high temperature corrosion mitigating effect than good under the normal temperature, reason may be when temperature raises, surface tension of liquid reduces, increased activity, inhibiter has the trend that concentrates in the worksheet surface layer, might form the molecular film of a densification at solid surface, fresh metal base surface will be had better physical shielding effect, thereby avoid the extra dissolving of body material and corrosive to take place.
Embodiment
Below among each embodiment, the parts of the high-temperature alloy surface aluminium silicon thermodiffusion infiltration layer of being tested are all selected the low-pressure turbine blade in a kind of engine for use, high and low pressure turning vane body material Ж С 6y alloy.Blade surface adopts and fuses the type alumetizing process.It is about 25% to contain aluminium through the aluminum silicon infiltration layer of 1000 ℃ of vacuum heat diffusion, and siliceous is 1.24～3.42%, and the main protective tissue that forms is β-NiAl phase, and aluminum silicon infiltration layer thickness is at 25 μ m～35 μ m.
Example 1: choose HCl 120g/L (industrial HCl), combined additive 6g/L, its weight proportion are 4-methylimidazole: vulkacit H=30%: 70% (following each embodiment proportioning is all identical), all the other are water, combine removal liquid.Parts are put into the groove that above-mentioned removal liquid is housed soak, removing liquid temp is 60 ℃, and soak time 60min stirs once with wind every 8min in the immersion process.In removing the infiltration layer process, the floating ash of residue at parts surface formation one deck black arranged, hindered the abundant dissolving of infiltration layer, test parts be taken out from solution 2 times, after brush falls the floating ash of this layer, continue in removing liquid, to be dipped to the infiltration layer Ex-all.Test-results, matrix appears substantially, no excessive erosion.
Example 2: it is all identical with example 1 to remove liquid preparation and application art condition, and different is: parts soak time in removing liquid is 80min.Test-results is that matrix all appears, and no excessive erosion is effective.
Example 3: choose HCl 120g/L (industrial HCl), combined additive 7g/L, all the other are water, are mixed with removal liquid, and parts soak time in removing liquid is 60min, and temperature is controlled to be 55 ℃, and other processing condition are with example 1.Test-results is that matrix appears, and no excessive erosion is effective.
Example 4: all test conditionss are identical with example 3, and different is that parts soak time in removing liquid is 80min.Test-results is that matrix appears, and no excessive erosion is effective.
Example 5: choose HCl 150g/L (industrial HCl), combined additive 6g/L, all the other are water, combine removal liquid, then parts are put into the groove that removal liquid is housed and are soaked, controlled temperature is 60 ℃, soak time 60min stirs once with wind every 9min in the immersion process, and parts are taken out from solution 1 time, brush falls the floating ash on the aspect, continues to put into removal liquid then and soaks the Ex-all infiltration layer.Test-results, matrix all appears, no excessive erosion.
Example 6: test conditions is with example 5, and different is that parts soak time in removing liquid is 80min, and test-results is that matrix all appears, and no excessive erosion is effective.
Example 7: choose HCl 150g/L (industrial HCl), combined additive 7g/L, all the other are water, combine removal liquid, parts are put into to be equipped with then and removed liquid bath and soak, controlled temperature is 55 ℃, soak time 60min, stir once with wind every 10min in the immersion process, parts take out from solution 2 times, and brush falls the floating ash on the aspect.Test-results is that matrix all appears, and no excessive erosion is effective.
Example 8: test conditions is with example 7, and different is that test materials is being removed liquid immersion 80min.Test-results, matrix all appears, and no excessive erosion is effective.
Example 9: choose HCl 180g/L (industrial HCl), combined additive 6g/L, all the other are water, combine removal liquid, parts are put into to be equipped with then and removed liquid bath and soak, controlled temperature is 50 ℃, soak time 80min, stir once with wind every 8min in the immersion process, parts take out from solution 3 times, brush away the floating ash on the aspect.Test-results, matrix all appears, no excessive erosion.
Example 10: choose HCl 180g/L (industrial HCl), combined additive 7g/L, all the other are water, combine removal liquid, then parts are put into the groove that removal liquid is housed and soaked, controlled temperature is 60 ℃, soak time 60min, stir once with wind every 10min in the immersion process, parts take out from solution 2 times, and brush falls the floating ash on the aspect.Test-results, matrix all appears, and no excessive erosion is effective.
Example 11: choose HCl 180g/L (industrial HCl), combined additive 8g/L, all the other are water, combine removal liquid, then parts are put into the groove that removal liquid is housed and are soaked, controlled temperature is 55 ℃, soak time 60min, other condition is with example 10.The test-results individual areas has discontinuous infiltration layer, no excessive erosion.
Claims (7)
1, a kind of removal liquid of high-temperature alloy surface aluminum silicon infiltration layer, the moiety that it is characterized in that this removal liquid is: hydrochloric acid 120～180g/L, combined additive 6.0～8.0g/L, all the other are water, wherein combined additive is to be formed by 4-methylimidazole and vulkacit H assembly.
2,, it is characterized in that combined additive composition weight proportion is: 4-methylimidazole: vulkacit H=30%: 70% according to the removal liquid of the described high-temperature alloy surface aluminum silicon infiltration layer of claim 1.
3,, it is characterized in that the moiety of removing liquid is according to the removal liquid of the described high-temperature alloy surface aluminum silicon infiltration layer of claim 1: hydrochloric acid 150g/L, combined additive 7g/L, all the other are water.
4, the described high-temperature alloy surface aluminum silicon infiltration layer of claim 1 is removed the application method of liquid, it is characterized in that at first being: hydrochloric acid 120～180g/L by moiety, combined additive 6.0～8.0g/L, all the other are mixed with removal liquid for water, the parts that will have the high-temperature alloy surface aluminum silicon infiltration layer then are immersed in to be removed in the liquid, controlled temperature is 50～60 ℃, and soak time is 60～80min; To be interrupted in the immersion process and stir and discontinuously parts are taken out from remove liquid, remove the floating ash that the surface forms.
5, according to the application method of the removal liquid of the described high-temperature alloy surface aluminum silicon infiltration layer of claim 4, it is characterized in that parts are immersed in the interruption of removing in the liquid process and stir, adopt wind to stir, stir once every 8～10min.
6,, it is characterized in that the number of times that discontinuously parts is taken out is 1～3 time from remove liquid according to the application method of the removal liquid of the described high-temperature alloy surface aluminum silicon infiltration layer of claim 4.
7, according to the application method of the removal liquid of the described high-temperature alloy surface aluminum silicon infiltration layer of claim 4, the controlled temperature that it is characterized in that removing liquid is 56 ℃.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200410087557XA CN1302154C (en) | 2004-11-17 | 2004-11-17 | Stripping liquid for aluminum silicon infiltration layer on the surface of high-temperature alloy and its application method |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB200410087557XA CN1302154C (en) | 2004-11-17 | 2004-11-17 | Stripping liquid for aluminum silicon infiltration layer on the surface of high-temperature alloy and its application method |
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| CN1605655A CN1605655A (en) | 2005-04-13 |
| CN1302154C true CN1302154C (en) | 2007-02-28 |
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| CN107267989A (en) * | 2016-04-08 | 2017-10-20 | 贵州黎阳航空动力有限公司 | A kind of chemical solution for being used to remove high-temperature alloy surface aluminum silicon infiltration layer |
| CN112730487A (en) * | 2020-12-17 | 2021-04-30 | 河钢股份有限公司 | Preparation method and measurement method of aluminum-silicon coated steel residual stress measurement sample |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU950799A1 (en) * | 1980-12-22 | 1982-08-15 | Предприятие П/Я Г-4377 | Solution for pickling metals |
| FR2592397A1 (en) * | 1985-12-26 | 1987-07-03 | Maron Hugues | Corrosion inhibitor for pickling baths for metal surfaces |
| WO1997003167A1 (en) * | 1995-07-13 | 1997-01-30 | Henkel Corporation | Inhibited pickling acids containing chloride and zinc ions |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU950799A1 (en) * | 1980-12-22 | 1982-08-15 | Предприятие П/Я Г-4377 | Solution for pickling metals |
| FR2592397A1 (en) * | 1985-12-26 | 1987-07-03 | Maron Hugues | Corrosion inhibitor for pickling baths for metal surfaces |
| WO1997003167A1 (en) * | 1995-07-13 | 1997-01-30 | Henkel Corporation | Inhibited pickling acids containing chloride and zinc ions |
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Granted publication date: 20070228 Termination date: 20161117 |