CN104762631A - Pickling and passivating method of ferrite stainless steel components - Google Patents
Pickling and passivating method of ferrite stainless steel components Download PDFInfo
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- CN104762631A CN104762631A CN201410001642.3A CN201410001642A CN104762631A CN 104762631 A CN104762631 A CN 104762631A CN 201410001642 A CN201410001642 A CN 201410001642A CN 104762631 A CN104762631 A CN 104762631A
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- stainless steel
- acid wash
- wash passivation
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Abstract
The invention provides a pickling and passivating method of ferrite stainless steel components. The pickling and passivating method comprises following steps: firstly, attachments and oil stain on the surfaces of the ferrite stainless steel components are removed, and the ferrite stainless steel components are washed with water until surface pH value is 7; the surfaces of the ferrite stainless steel components are coated with a pickling passivation paste for pickling and passivating; and after pickling and passivating, the ferrite stainless steel components are washed with water until surface pH value is 7. The pickling and passivating method can be effectively used for pickling and passivating of ferrite stainless steel components, especially large ferrite stainless steel components. Corrosion resistance of the ferrite stainless steel components processed via the pickling and passivating method is improved greatly; appearance quality is improved greatly; and service life is prolonged greatly.
Description
Technical field
The present invention relates to stainless steel surface process field, be specifically related to a kind of acid wash passivation method of ferrite stainless steel beam column.
Background technology
Stainless steel, particularly ferritic stainless steel, its surface irregularity, and also surface contamination, scuffing, welding slag, splash etc. can be brought in transport and the course of processing, if not treated direct use, then stainless steel surface is easy to corrosion.
Stainless steel component is positioned in air can form oxide film, but the protectiveness of this film is perfect not.For improving stainless corrosion resistance, usually acid wash passivation process being carried out to its surface and forming passive film, making stainless steel play maximum solidity to corrosion.Meanwhile, stainless steel surface acid wash passivation, prevents product contamination in addition and obtains effect attractive in appearance.
In prior art, stainless steel welded of Large Fe ferritic seldom adopts acid washing passivation technology to process, because it is bulky, complex structure, acid wash passivation method conveniently, the utility appliance of large volume must be used to process, with high costs, and be difficult to obtain uniform acid wash passivation effect.For the C80B type stainless steel of domestic production fortune coal open wagon body (material is TCS345 ferritic stainless steel) and the stainless steel Ore Gondola car body (material is TCS345 ferritic stainless steel) exporting Australia, because structural part volume is larger, stainless steel surface does not do any rotproofing, extensively there is stainless steel surface and is easy to corrosion, affects the phenomenon of visual appearance.
How carrying out acid wash passivation process for bulky ferrite stainless steel beam column, is those skilled in the art's problem demanding prompt solutions.
Summary of the invention
For improving the Corrosion Protection of Large Fe ferritic stainless steel component, the object of this invention is to provide a kind of acid wash passivation method of ferrite stainless steel beam column.
The acid wash passivation method of ferrite stainless steel beam column provided by the invention comprises the following steps:
S1: the dirt settling and the greasy dirt that remove described ferritic stainless steel component surface, is washed to described surface in neutral;
S2: carry out acid wash passivation process to the described surface coated acid wash passivation cream after step S1 process, the after washing that is disposed is neutral to described surface.
Wherein, described ferritic stainless steel member integrated carries out described step S2, or portions carries out described step S2 until described ferritic stainless steel member integrated completes described step S2.
Wherein, the thickness of the acid wash passivation cream coating described in described S2 step is 1 ~ 3mm, and the treatment time of described acid wash passivation process is 5 ~ 15min.
Wherein, in described S2 step, the coating method of described acid wash passivation cream is cylinder coating.
Preferably, described S1 step comprises:
S11: adopt physics polishing mode to remove the dirt settling of described ferritic stainless steel component surface;
S12: adopt basic solution to remove the greasy dirt of described ferritic stainless steel component surface;
S13: the ferritic stainless steel component surface after S12 step process is carried out washing until be neutral.
Wherein, in described S11 step, quartz sand is used to polish as polishing abrasive material.
Wherein, the basic solution pH value in described S12 step is 8.5 ~ 9.5.
Wherein, the basic solution in described S12 step is the solution of sodium hydroxide, potassium hydroxide or water glass.
In above-mentioned acid wash passivation method, described ferrite stainless steel beam column is ferritic stainless steel open-top car or hopper car.
Acid wash passivation method of the present invention uses acid wash passivation cream, the coating methods such as roller coating can be adopted to process, overcoming acid wash passivation liquid must use large volume splendid attire device to carry out the technological deficiency of acid wash passivation process, without the need to the utility appliance of complexity, working method is easy, processing cost is cheap, therefore makes the acid wash passivation of Large Fe ferritic stainless steel component become possibility.
Acid wash passivation method of the present invention comprises the main processing steps such as decontamination, alkali cleaning, once washing, acid wash passivation, secondary washing, whole treatment process can effectively for the acid wash passivation of ferrite stainless steel beam column, especially Large Fe ferritic stainless steel component, ferrite stainless steel beam column after acid wash passivation method of the present invention process can significantly improve resistance to corrosion, visual appearance also can significantly improve, and work-ing life significantly extends.
Accompanying drawing explanation
Fig. 1 is the structural representation of car body described in the embodiment of the present invention;
Wherein, 1, front hopper walls; 2, right front half sidewall; 3, right back half sidewall; 4, dividing plate.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, will be further described below the technical scheme of exemplary embodiment of the present invention.
The invention provides a kind of acid wash passivation method of ferrite stainless steel beam column, it comprises the following steps:
S1: the dirt settling and the greasy dirt that remove described ferritic stainless steel component surface, is washed to this surface in neutral;
S2: the surface coated acid wash passivation cream to the ferrite stainless steel beam column after step S1 process carries out acid wash passivation process, the after washing that is disposed is neutral to this surface.
In an embodiment of acid wash passivation method according to the present invention, this acid wash passivation method is applicable to existing any component, especially large-scale component containing ferritic stainless steel, the component be made up of ferritic stainless steel completely can be comprised, also can comprise the component be jointly made up of ferritic stainless steel and other material.
In an embodiment of acid wash passivation method according to the present invention, this acid wash passivation method is applicable to the ferrite stainless steel beam column of existing any volume, any shape.According to differences such as ferritic stainless steel Components Shape, sizes, its entirety can be carried out the process of step S2, also portions can carry out step S2 until the process of ferritic stainless steel member integrated completing steps S2.
In an embodiment of acid wash passivation method according to the present invention, the thickness of the acid wash passivation cream coating in S2 step can be 1 ~ 3mm.For making surface passivation effect more even, the time of acid wash passivation cream coating should not be excessively of a specified duration, and avoid the difference causing passivation effect, coating duration controls to be advisable within 2 minutes.
In an embodiment of acid wash passivation method according to the present invention, the model acid wash passivation cream such as the acid wash passivation cream for S2 step can be the common any number of acid wash passivation cream for acid-washing stainless steel Passivation Treatment, the Ke Lin-309 that such as Dalian section beautiful jade cleaning Chemical Co., Ltd. produces.According to the difference of acid wash passivation cream, the treatment time of acid wash passivation process can be 5 ~ 15 minutes, must guarantee that dry solidification does not appear in acid wash passivation cream in passivating process.
In an embodiment of acid wash passivation method according to the present invention, the mode that cylinder can be adopted to be coated with is coated with acid wash passivation cream, and this coating method is simple and easy to operate, without the need to the utility appliance of complexity.
In an embodiment of acid wash passivation method according to the present invention, S1 step wherein can comprise the following steps:
S11: adopt physics polishing mode to remove the dirt settling of ferritic stainless steel component surface;
S12: the greasy dirt adopting basic solution removing ferritic stainless steel component surface;
S13: the ferritic stainless steel component surface after S12 step process is carried out washing until be neutral.
Wherein, in S11 step, the surface attachments of ferrite stainless steel beam column comprises welding slag, splash and other surface attachments etc., physics mode can be adopted to polish remove, such as, polishing abrasive material can be added and carry out mechanical grinding, Stainless Steel Wire brush, stainless steel shovel or emery wheel etc. can also be adopted to remove surface attachments by physics mode.When adopting polishing abrasive material to carry out mechanical grinding, quartz sand can be selected as abrasive material.
Wherein, in S12 step, basic solution can for the common alkaline solution for removing stainless steel surface greasy dirt, and its pH value is 8.5 ~ 9.5, can be multiple inorganic alkali solution, includes but not limited to sodium hydroxide, potassium hydroxide, sodium silicate solution etc.
According in acid wash passivation method of the present invention, when using liquid reagent (as basic solution, clear water etc.) process ferritic stainless steel component surface, water blast gun can be adopted by spray liquid to component surface, in sprinkling process, for guaranteeing the consistence of passivation effect, evenly must spray each place of ferritic stainless steel component surface, in sprinkling process, cylinder etc. can also be adopted to clean component surface.
According in acid wash passivation method of the present invention, " washing is until be neutral " refers to and uses clear water to spray component surface, makes its surface uniform form water membrane, and the pH value of moisture film, about 7 (can be 6-8), is neutral.
Acid wash passivation process according to the present invention comprises pickling and oxygenant passivation two processes, can ensure integrity and the stability of stainless steel surface passive film after acid wash passivation process.Specifically, the object of pickling is for Passivation Treatment creates favorable conditions, ensure the passive film forming high-quality, first make stainless steel surface be about 10 μm of thick upper layers by pickling to be corroded, the chemically reactive of acid solution makes other position on the dissolution rate specific surface of rejected region high, therefore pickling also can make whole surface be tending towards uniform balance, easily causes the hidden danger of corrosion to be removed efficiently.The more important thing is, by acid wash passivation process, iron can be made to dissolve than the selective oxide of chromium and chromium with the oxide compound of iron, eliminate poor layers of chrome, cause chromium in the enrichment of stainless steel surface, the current potential of this rich chromium passivation film can reach+1.0V (SCE), close to the current potential of precious metal, significantly improves the erosion-resisting stability of ferritic stainless steel.
Embodiment makes every effort to open up salt hopper car acid wash passivation process
Car body is funnel structure, is specifically divided into four pieces, front, rear, left and right hopper walls and central dividing plate totally 8 independent faces, front and back bucket height about 2600mm, and first is truncated into 40 degree of inclination face widths and is about 3500mm, and height is 1400mm about; Sidewall funnel is about 7000mm, and height is 2600mm about, and top is vertical surface, is highly about 1400mm, and bottom is scarp, and angle of inclination is about 40 degree, is divided into front and back two halves by central dividing plate.Structural representation is (only face, display section) as shown in Figure 1.
Portions mode is adopted to carry out acid wash passivation process to vehicle body, according to body construction, acid wash passivation processing sequence is: front hopper walls → left front half sidewall → right front half sidewall → dividing plate is towards above → rear hopper walls → left back half sidewall → right back half sidewall → dividing plate facing backwards.Concrete implementation step is as follows:
(1) by car body weld seam sanding, weld seam coating is removed.
(2) use Stainless Steel Wire brush, stainless steel shovel or emery wheel etc. to remove other dirt settling of welding slag, splash and steel structure surface, and blow off surface with high-pressure air.
(3) protect, plastics film and adhesive tape is used not to need the part of acid wash passivation and to need the part of acid wash passivation to isolate, and cover the part not needing acid wash passivation, ensure that the materials such as the acid wash passivation cream used in acid wash passivation process can not with the part contact not needing acid wash passivation.
(4) sodium hydroxide solution pH value being about 9 uses water blast gun to be ejected into the surface needing acid wash passivation, and block-by-block sprays, and for strengthening degreasing result, using the position of cylinder to greasy dirt to roll simultaneously and dragging, ensure all for car body surface greasy dirts to dissolve to remove.
(5) water blast gun water inlet pipe is transformed into clean water basin, clear water is used to rinse car body surface, block-by-block rinses, use cylinder to roll to drag simultaneously, to ensure that basic solution and alkali cleaning debris all wash down, in flushing process, the position that water is splashed to must at once bath, ensures water part and can not evaporate into and leave washmarking.Flushing process, until all surfaces that is rinsed are all moisture state, detects debris potential of hydrogen, until raffinate is in neutral (pH value is about 7), clear water rinses and terminates.
(6) clear water rinses after complete 5 minutes, bring into use cylinder roller coating Ke Lin-309 acid wash passivation cream (beautiful jade cleaning Chemical Co., Ltd. of Dalian section), acid wash passivation cream is stained with cylinder, roller coating from top to bottom, from topmost, roller coating is always to bottom, width is roller width, and gauge control is 1 ~ 3mm, after having rolled a roller width, the other width of roller coating successively, ensure the surface of having rolled an acid wash passivation part within 2 minutes, if area is excessive, need staff be increased, after acid wash passivation cream is painted with, passivation about 10 minutes.
(7) after passivation reaction, start to rinse with clear water, water blast gun is used clear water to be ejected into acid wash passivation cream surface, spray water from top to bottom, water spray simultaneously, use cylinder to roll to drag, to ensure that passivation cream is all rinsed round brush and falls, in water-rinsing process, have water and be splashed to other surfaces, be splashed to the water droplet on other surfaces not dry before, use hydraulic giant will be dabbled, and surface is whole to be rinsed one time, at the end of the cleaning of acid wash passivation face, car body all surface must be made all to be rinsed, and all to remain moisture state.
After (8) first surface passivations complete, carry out Bluepoint inspection, be up to the standards, first surface passivation completes, defective, again operates by six, seven steps, until Bluepoint inspection meets GB/T25150-2010, to be namely considered as acid wash passivation qualified.
(9) repeat (6), (7), (8) step, carry out the acid wash passivation operation on other surfaces in order, until all surfaces of passivation that needs of car body all complete acid wash passivation process.
(10), after all surface acid wash passivation completes, protection is removed.
Although in order to the present invention is described, disclose the preferred embodiments of the invention, but it will be understood by those of skill in the art that when not departing from the design of the present invention and scope that claims limit, various amendment, interpolation and replacement can be made to the present invention.
Claims (9)
1. an acid wash passivation method for ferrite stainless steel beam column, comprises the following steps:
S1: the dirt settling and the greasy dirt that remove described ferritic stainless steel component surface, is washed to described surface in neutral;
S2: carry out acid wash passivation process to the described surface coated acid wash passivation cream after step S1 process, the after washing that is disposed is neutral to described surface.
2. acid wash passivation method according to claim 1, wherein, described ferritic stainless steel member integrated carries out described step S2, or portions carries out described step S2 until described ferritic stainless steel member integrated completes described step S2.
3. acid wash passivation method according to claim 1, wherein, the thickness of the acid wash passivation cream coating described in described S2 step is 1 ~ 3mm, and the treatment time of described acid wash passivation process is 5 ~ 15 minutes.
4. acid wash passivation method according to claim 3, wherein, in described S2 step, the coating method of described acid wash passivation cream is cylinder coating.
5. according to the acid wash passivation method of any one of claim 1-4, wherein, described S1 step comprises:
S11: adopt physics polishing mode to remove the dirt settling of described ferritic stainless steel component surface;
S12: adopt basic solution to remove the greasy dirt of described ferritic stainless steel component surface;
S13: the ferritic stainless steel component surface after S12 step process is carried out washing until be neutral.
6. acid wash passivation method according to claim 5, wherein, in described S11 step, uses quartz sand to polish as polishing abrasive material.
7. acid wash passivation method according to claim 5, wherein, the basic solution pH value in described S12 step is 8.5 ~ 9.5.
8. acid wash passivation method according to claim 7, wherein, the basic solution in described S12 step is the solution of sodium hydroxide, potassium hydroxide or water glass.
9. according to the acid wash passivation method of any one of claim 1-8, wherein, described ferrite stainless steel beam column is ferritic stainless steel open-top car or hopper car.
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| CN201410001642.3A CN104762631A (en) | 2014-01-02 | 2014-01-02 | Pickling and passivating method of ferrite stainless steel components |
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| CN201410001642.3A CN104762631A (en) | 2014-01-02 | 2014-01-02 | Pickling and passivating method of ferrite stainless steel components |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106381499A (en) * | 2016-10-26 | 2017-02-08 | 江苏省沙钢钢铁研究院有限公司 | Acid pickling method of anti-corrosion steel bars |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106381499A (en) * | 2016-10-26 | 2017-02-08 | 江苏省沙钢钢铁研究院有限公司 | Acid pickling method of anti-corrosion steel bars |
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