CN103320778B - A kind of aviation pipe stainless steel passivation process - Google Patents
A kind of aviation pipe stainless steel passivation process Download PDFInfo
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- CN103320778B CN103320778B CN201210072736.0A CN201210072736A CN103320778B CN 103320778 B CN103320778 B CN 103320778B CN 201210072736 A CN201210072736 A CN 201210072736A CN 103320778 B CN103320778 B CN 103320778B
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Abstract
The invention belongs to field of aviation flight, be specifically related to aviation pipe stainless steel passivation process, comprise the following steps: alkali degreasing; Pickling stages; Sandblasting; First time water cleaning; The passivation stage; The cleaning of second time water and drying.Aviation pipe stainless steel passivation process of the present invention, safely, efficiently; Solve the problem of the anti-fingerprint pollution difference of stainless steel surface; And guarantee the ornamental of stainless steel surface.
Description
Technical field
The invention belongs to Field of Aviation Manufacturing, be specifically related to aviation pipe stainless steel passivation process.
Background technology
Aviation pipe is the important materials of space flight, aviation and nuclear energy leading-edge field, growing along with science and technology, and the usage quantity of aviation pipe increases day by day.Aviation pipe belongs to hi-tech and the longer product of life cycle, high to its specification of quality.Therefore, the control of its production process is just seemed particularly important.The production technique of aviation pipe is comparatively complicated, is specific alloy tubing (as superalloy, non-corrosive metal, stainless steel).The production of aviation pipe is generally multi-pass, wherein rolling, and---pickling moves in circles in degreasing---thermal treatment---.
Be example with regard to stainless steel surface passivation technology; the oxide scale layer of stainless steel surface is as hard as marble; more be difficult to remove than the zone of oxidation of general steel surface; develop various acid-washing stainless steel passivation cream, acid wash passivation liquid both at home and abroad at present; and this kind of thing is all used at the normal wet lower reagent that stainless steel surface oxide scale layer also can form one deck passivation protection film of removing, its passivation effect and using method are not all desirable.
Base problem is mainly manifested in: acid wash passivation cream, acid wash passivation liquid product use the raw materials such as a large amount of hydrofluoric acid, sulfuric acid, hydrochloric acid, sodium alkyl benzene sulfonate, sodium-chlor, the element such as these raw materials all contain very abundant fluorine, chlorine, sulphur, receive, these elements can work the mischief to stainless steel, hide numerous murderous intentions.It does not wash clean because floating or infiltrates remaining and stay working-surface.Under the occasions such as illumination in the future, high temperature, high pressure, high-throughput radiation photograph, pole low temperature reversed of stress, they can cause stainless steel parts to produce pitting, needle-like burn into grain boundary attack, scorching corrosion etc.And this kind of hot spot has plenty of the direct pathogeny body of Materials Fracture, what have is then the catalyzer of Materials Fracture.Such as, low-temperature embrittleness, reheat cracking, pressurized vessel split before leaking, the fatigue of locator of high speed is split, brittle fracture under low temperature etc.
Therefore, seeking a kind of safety, efficiently passivation for stainless steel effect, and solve the problem of the anti-fingerprint pollution difference of stainless steel surface, is whole industry problem in the urgent need to address.
Summary of the invention
Technical purpose of the present invention is for the deficiencies in the prior art, provides a kind of aviation pipe stainless steel passivation process with safety, efficiently passivation for stainless steel effect.
The technical scheme realizing the technology of the present invention object is: a kind of aviation pipe stainless steel passivation process, comprises the following steps:
Alkali degreasing, floods stainless steel work-piece 25 minutes in the alkali degreasing solution of 50 ~ 59 DEG C, and described alkali degreasing solution is the alkali degreasing solution of the sodium hydroxide containing 3.1 ~ 4.9wt%;
Pickling stages, soaks 1 ~ 2 minute stainless steel work-piece with the salpeter solutions of 20 ~ 40 DEG C, then rinses in sprinkle mode by tap water at normal temperature;
Sandblasting, at workpiece surface even application diamantane or granulated glass sphere;
First time water cleaning, soaks 2 ~ 3 minutes with 20 ~ 40 DEG C of tap water, then rinses in sprinkle mode by tap water at normal temperature;
In the passivation stage, soaked 20 ~ 30 minutes by workpiece in the nitric acid of 20 ~ 40 DEG C and sodium dichromate solution mixed solution, make workpiece surface form layer protecting film, the pH value of described nitric acid and sodium dichromate solution mixed solution is 3-4;
The cleaning of second time water, rinses in sprinkle mode with the pure water of 80 ~ 100 DEG C;
Drying, toasts 20 ~ 30 minutes in the baking oven of 100 ~ 200 DEG C.
As the further optimization of technique scheme, the mixed solution in described passivation stage also comprises the phosphoric acid of 11 ~ 18 g/L, the trimagnesium phosphate of 5 ~ 10 g/L and the zinc nitrate of 12 ~ 20 g/L.
As the further optimization of technique scheme, the mixed solution in described passivation stage is for containing nitric acid 300 ~ 500g/L, the solution of sodium dichromate 99 20 ~ 30g/L.
As the further optimization of technique scheme, described pickling, for the first time water are cleaned and the hydraulic pressure of second time water wash phase is less than or equal to 25psi.
As the further optimization of technique scheme, be also coated with aqueous transparent varnish after oven dry and drying.
As the further optimization of technique scheme, the coating thickness of described aqueous transparent varnish is 10mm ~ 15mm.
Compared with prior art, the beneficial effect main manifestations of a kind of aviation pipe stainless steel passivation process of the present invention is:
1) safely, efficient;
2) problem of the anti-fingerprint pollution difference of stainless steel surface is solved;
3) the ornamental of stainless steel surface is guaranteed.
Accompanying drawing explanation
Figure 1 shows that the steps flow chart block diagram of a kind of aviation pipe stainless steel passivation process of the present invention.
Embodiment
As one of the most preferred embodiment of a kind of aviation pipe stainless steel passivation process of the present invention, see accompanying drawing 1, it comprises the following steps:
Alkali degreasing, flooded 25 minutes in the alkali degreasing solution of 59 DEG C by stainless steel work-piece, described alkali degreasing solution is the alkali degreasing solution of the sodium hydroxide containing 4.9wt%;
Pickling stages, soaks 2 minutes with the salpeter solutions of 40 DEG C to stainless steel work-piece, then rinses in sprinkle mode by tap water at normal temperature;
Sandblasting, at workpiece surface even application diamantane or granulated glass sphere;
First time water cleaning, soaks 3 minutes with 40 DEG C of tap water, then rinses in sprinkle mode by tap water at normal temperature;
In the passivation stage, soaked 20 minutes by workpiece in the nitric acid of 40 DEG C and sodium dichromate solution mixed solution, make workpiece surface form layer protecting film, the pH value of described nitric acid and sodium dichromate solution mixed solution is 3;
The cleaning of second time water, rinses in sprinkle mode with the pure water of 80 DEG C;
Drying, toasts 30 minutes in the baking oven of 100 DEG C.
The mixed solution in described passivation stage also comprises the zinc nitrate of the phosphoric acid of 11 g/L, the trimagnesium phosphate of 5 g/L and 12 g/L.
The mixed solution in described passivation stage is for containing nitric acid 300g/L, the solution of sodium dichromate 99 20g/L.
Described pickling, for the first time water are cleaned and the hydraulic pressure of second time water wash phase is less than 25psi.
Aqueous transparent varnish is also coated with and drying after oven dry.
The coating thickness of described aqueous transparent varnish is 10mm.
The aviation pipe stainless steel passivation process of the embodiment of the present invention, safely, efficiently; Solve the problem of the anti-fingerprint pollution difference of stainless steel surface; Guarantee the ornamental of stainless steel surface.
In sum; after those of ordinary skill in the art reads file of the present invention; make the replacement of scheme between other various corresponding conversion scheme or various embodiments of the present invention according to technical scheme of the present invention and technical conceive without the need to creative brainwork, all belong to the scope that the present invention protects.
Claims (5)
1. an aviation pipe stainless steel passivation process, is characterized in that, comprises the following steps:
Alkali degreasing, floods stainless steel work-piece 25 minutes in the alkali degreasing solution of 50 ~ 59 DEG C, and described alkali degreasing solution is the alkali degreasing solution of the sodium hydroxide containing 3.1 ~ 4.9wt%;
Pickling stages, soaks 1 ~ 2 minute stainless steel work-piece with the salpeter solutions of 20 ~ 40 DEG C, then rinses in sprinkle mode by tap water at normal temperature;
Sandblasting, at workpiece surface even application diamantane or granulated glass sphere;
First time water cleaning, soaks 2 ~ 3 minutes with 20 ~ 40 DEG C of tap water, then rinses in sprinkle mode by tap water at normal temperature;
In the passivation stage, soaked 20 ~ 30 minutes by workpiece in the nitric acid of 20 ~ 40 DEG C and sodium dichromate solution mixed solution, make workpiece surface form layer protecting film, the pH value of described nitric acid and sodium dichromate solution mixed solution is 3-4;
The cleaning of second time water, rinses in sprinkle mode with the pure water of 80 ~ 100 DEG C;
Drying, toasts 20 ~ 30 minutes in the baking oven of 100 ~ 200 DEG C,
The mixed solution in described passivation stage also comprises the zinc nitrate of the phosphoric acid of 11 ~ 18g/L, the trimagnesium phosphate of 5 ~ 10g/L and 12 ~ 20g/L.
2. a kind of aviation pipe stainless steel passivation process according to claim 1, is characterized in that, the mixed solution in described passivation stage is for containing nitric acid 300 ~ 500g/L, the solution of sodium dichromate 99 20 ~ 30g/L.
3. a kind of aviation pipe stainless steel passivation process according to claim 1, is characterized in that, described pickling, for the first time water are cleaned and the hydraulic pressure of second time water wash phase is less than or equal to 25psi.
4. a kind of aviation pipe stainless steel passivation process according to claim 1, is characterized in that, is also coated with aqueous transparent varnish and drying after oven dry.
5. a kind of aviation pipe stainless steel passivation process according to claim 4, is characterized in that, the coating thickness of described aqueous transparent varnish is 10mm ~ 15mm.
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| CN201210072736.0A CN103320778B (en) | 2012-03-20 | 2012-03-20 | A kind of aviation pipe stainless steel passivation process |
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| CN201210072736.0A CN103320778B (en) | 2012-03-20 | 2012-03-20 | A kind of aviation pipe stainless steel passivation process |
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| CN103320778A CN103320778A (en) | 2013-09-25 |
| CN103320778B true CN103320778B (en) | 2015-09-23 |
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| CN103866316B (en) * | 2014-02-27 | 2016-05-04 | 北京航天控制仪器研究所 | A kind of beryllium material chemical passivation processing method |
| CN106148936B (en) * | 2015-03-25 | 2019-04-23 | 株洲时代新材料科技股份有限公司 | A kind of stainless steel material treatment process improving antiseptic property |
| CN104962910A (en) * | 2015-06-26 | 2015-10-07 | 合肥长兴汽车配件有限公司 | Rust-proof treatment method for stainless-steel welding joint |
| CN105441919A (en) * | 2015-12-11 | 2016-03-30 | 中国航空工业标准件制造有限责任公司 | Passivator and passivation method of partially nitrided 1Cr11Ni2W2MoV material product |
| CN107523823A (en) * | 2016-06-22 | 2017-12-29 | 株洲中车时代电气股份有限公司 | A kind of passivating method of parts of stainless steel |
| CN106939420A (en) * | 2017-03-23 | 2017-07-11 | 合肥协耀玻璃制品有限公司 | A kind of passivation for stainless steel liquid and its passivation technology |
| CN109676533A (en) * | 2018-12-29 | 2019-04-26 | 深圳仕上电子科技有限公司 | The surface treatment method of metal works |
| CN110523956A (en) * | 2019-09-04 | 2019-12-03 | 马鞍山海华耐磨材料科技有限公司 | A kind of preparation process of the anticorrosive liner plate of high-strength abrasion-proof |
| CN111733409A (en) * | 2020-06-04 | 2020-10-02 | 太仓托普斯特金属制品有限公司 | Vitrification process of automobile parts made of carbon steel material |
| CN115369396A (en) * | 2022-08-30 | 2022-11-22 | 株洲时代金属制造有限公司 | Surface treatment method for rail transit stainless steel electrical cabinet |
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| CN101166397A (en) * | 2006-10-18 | 2008-04-23 | 比亚迪股份有限公司 | A method for removing sensitization film in flexible printed circuit board |
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