CN106637170A - Stainless steel passivation technology - Google Patents
Stainless steel passivation technology Download PDFInfo
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- CN106637170A CN106637170A CN201510736713.9A CN201510736713A CN106637170A CN 106637170 A CN106637170 A CN 106637170A CN 201510736713 A CN201510736713 A CN 201510736713A CN 106637170 A CN106637170 A CN 106637170A
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- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention discloses a stainless steel passivation technology. The stainless steel passivation technology comprises the following steps: a metal workpiece is soaked in an NMP solution at the temperature of 50 DEG C for 30 min; the metal workpiece is washed with DI water for 20 min, and the NMP solution on the surface is removed; the metal workpiece is dried, and residual water on the surface is removed; polishing treatment is performed, and the metal workpiece surface is ground or polished; acid pickling treatment is performed with a nitric acid solution with the concentration of 7%-8% and the temperature of 30-35 DEG C for 1 min; the metal workpiece is washed with DI water for 20 min, and the acid solution on the surface is removed; the metal workpiece is dried at 120 DEG C for 1 h, and residual water on the surface is removed; the metal workpiece is subjected to passivating treatment with nitric acid with the mass concentration of 70% and industrial hydrofluoric acid with the mass concentration of 66%; the metal workpiece is washed with DI water for 20 min, and acid liquids on the surface of the metal workpiece are removed; residual liquids are blown dry by nitrogen at the room temperature, and the whole process of stainless steel passivation is finished.
Description
Technical field
The present invention relates to stainless technical field, more particularly to a kind of stainless passivating technique.
Background technology
Stainless steel can be categorized as according to structural constituent：Austenitic stainless steel, ferritic stainless steel, martensite
Stainless steel, two phase stainless steel etc. for body of stainless steel it is desirable that can be corrosion-resistant, there is high intensity again.Just
As carbon sheet needs to do special painting, stainless steel surfaces are also required to carry out acid wash passivation process, remove
Corrosion, the pollutant on surface etc., and the passivating film of one layer of densification is produced in plate surface, it is hedged off from the outer world,
Reach corrosion resistant purpose.Therefore, in order at utmost play stainless advantage, it would be highly desirable to solve two-phase not
Rust surface of steel plate is processed, a difficult problem for acid wash passivation.
The content of the invention
The purpose of the embodiment of the present invention is to provide a kind of stainless passivating technique, makes stainless steel surfaces produce one
The fine and close passivating film of layer, is hedged off from the outer world, and reaches corrosion resistant purpose such that it is able to play stainless steel maximum
Advantage.
Embodiments provide a kind of stainless passivating technique, including step：
S1, metal works are immersed in 30 minutes in the nmp solution that temperature is 50 degree；
S2, the flushing that using DI water metal works are carried out with 20 minutes, remove the NMP of surface of workpiece
Solution；
S3, metal works are dried, remove the residual moisture of surface of workpiece；
S4, it is processed by shot blasting, surface of workpiece is ground or is polished；
S5, concentration are that the salpeter solution that 7%～8%, temperature is 30 degree～35 degree carries out metal works pickling
Process 1 minute；
S6, using DI water to metal works rinse 20 minutes, remove surface of workpiece acid solution；
S7, by metal works put at a temperature of 120 degree dry 1 hour, remove surface of workpiece it is residual
Stay moisture；
S8, the nitric acid that use quality concentration is 70%, mass concentration be 66% industrial hydrofluoric acid to metal work
Part is passivated process；
S9, it is rinsed using DI water 20 minutes, removes the acidic liquid of surface of workpiece；
S10, using nitrogen Liquid Residue is dried up at normal temperatures, so as to complete the overall process of passivation for stainless steel.
Used as the improvement of such scheme, the milling tool is sand paper.
Compared with prior art, stainless passivating technique disclosed by the invention to stainless steel surfaces by carrying out
Acid wash passivation process, solves the attachment issue of corrosion, the pollutant of stainless steel surfaces etc., while on surface
The passivating film of one layer of densification is produced, is hedged off from the outer world, reach corrosion resistant effect.
Description of the drawings
Fig. 1 is a kind of schematic flow sheet of passivation for stainless steel technology in the embodiment of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clearly
Chu, it is fully described by, it is clear that described embodiment is only a part of embodiment of the invention, rather than
Whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not making creation
Property work under the premise of the every other embodiment that obtained, belong to the scope of protection of the invention.
It is a kind of schematic flow sheet of passivation for stainless steel technology provided in an embodiment of the present invention referring to Fig. 1.As schemed
Shown in 1, the method comprising the steps of：
S101, metal works are immersed in 30 minutes in the nmp solution that temperature is 50 degree；
Nmp solution employed in the embodiment of the present invention is alkalescent, has corruption simultaneously for organic matters such as oil stains
Corrosion.The greasy dirts such as the various oil stains for being attached to inwall, including machine oil, lubricating oil, antirust oil can be efficiently peeled off
With various physical barriers, when making next step pickling.Acid solution can be contacted thoroughly with inner surface of pipeline,
Promote the dissolving of metal works oxide.
S102, the flushing that using DI water metal works are carried out with 20 minutes, remove the NMP of surface of workpiece
Solution：
S103, metal works are dried, remove the residual moisture of surface of workpiece；
S104, it is processed by shot blasting, surface of workpiece is ground using milling tool or is polished；
Preferably, the milling tool is sand paper.
Grinding abrasive paper employed in the embodiment of the present invention, from not in the different operations of metal works grinding
With the sand paper of size particles, oarse-grained sand paper is selected first when grinding starts, with entering for grinding step
OK, short grained sand paper is gradually used instead.
S105, concentration are that the salpeter solution that 7%～8%, temperature is 30 degree～35 degree carries out pickling processes 1
Minute；
S106, using DI water rinse 20 minutes, remove surface of workpiece acid solution；
S107, at a temperature of 120 degree dry 1 hour, remove surface of workpiece residual moisture；
S108, the nitric acid that use quality concentration is 70%, mass concentration be 66% industrial hydrofluoric acid to metal
Workpiece is passivated process；
S109, it is rinsed using DI water 20 minutes, removes the acidic liquid of surface of workpiece；
S110, using nitrogen Liquid Residue is dried up at normal temperatures, so as to complete the overall process of passivation for stainless steel.
Compared with prior art, stainless passivating technique disclosed by the invention to stainless steel surfaces by carrying out
Acid wash passivation process, solves the attachment issue of corrosion, the pollutant of stainless steel surfaces etc., while on surface
The passivating film of one layer of densification is produced, is hedged off from the outer world, reach corrosion resistant effect.
The above is the preferred embodiment of the present invention, it is noted that for the common skill of the art
For art personnel, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, this
A little improvements and modifications are also considered as protection scope of the present invention.
Claims (2)
1. a kind of stainless passivating technique, it is characterised in that including step：
S1, metal works are immersed in 30 minutes in the nmp solution that temperature is 50 degree；
S2, the flushing that using DI water metal works are carried out with 20 minutes, remove the NMP of surface of workpiece
Solution；
S3, metal works are dried, remove the residual moisture of surface of workpiece；
S4, it is processed by shot blasting, surface of workpiece is ground or is polished；
S5, concentration are that the salpeter solution that 7%～8%, temperature is 30 degree～35 degree carries out acid to metal works
Wash process 1 minute；
S6, using DI water to metal works rinse 20 minutes, remove surface of workpiece acid solution；
S7, by metal works put at a temperature of 120 degree dry 1 hour, remove surface of workpiece it is residual
Stay moisture；
S8, the nitric acid that use quality concentration is 70%, mass concentration be 66% industrial hydrofluoric acid to metal work
Part is passivated process；
S9, metal works are rinsed using DI water 20 minutes, remove the Acidic Liquid of surface of workpiece
Body；
S10, using what nitrogen dried up residual surface of workpiece liquid is stayed at normal temperatures, so as to complete passivation for stainless steel
Overall process.
2. passivation for stainless steel technology as claimed in claim 1, it is characterised in that：The milling tool is sand
Paper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510736713.9A CN106637170A (en) | 2015-10-30 | 2015-10-30 | Stainless steel passivation technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510736713.9A CN106637170A (en) | 2015-10-30 | 2015-10-30 | Stainless steel passivation technology |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106637170A true CN106637170A (en) | 2017-05-10 |
Family
ID=58810129
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510736713.9A Pending CN106637170A (en) | 2015-10-30 | 2015-10-30 | Stainless steel passivation technology |
Country Status (1)
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| CN (1) | CN106637170A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109701934A (en) * | 2018-11-24 | 2019-05-03 | 关海洋 | Annealing furnace cleaning method for stainless steel band production |
| CN111893477A (en) * | 2020-07-31 | 2020-11-06 | 阴通明 | Stainless steel workpiece passivation process |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101343739A (en) * | 2008-09-01 | 2009-01-14 | 铁道部运输局 | Acid washing passivation technology for stainless steel |
| CN101575702A (en) * | 2008-05-09 | 2009-11-11 | 佛山市顺德区顺达电脑厂有限公司 | Molten tin bath surface treating method |
| CN103320803A (en) * | 2012-03-22 | 2013-09-25 | 宝山钢铁股份有限公司 | Plate strip temperature pickling process |
-
2015
- 2015-10-30 CN CN201510736713.9A patent/CN106637170A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101575702A (en) * | 2008-05-09 | 2009-11-11 | 佛山市顺德区顺达电脑厂有限公司 | Molten tin bath surface treating method |
| CN101343739A (en) * | 2008-09-01 | 2009-01-14 | 铁道部运输局 | Acid washing passivation technology for stainless steel |
| CN103320803A (en) * | 2012-03-22 | 2013-09-25 | 宝山钢铁股份有限公司 | Plate strip temperature pickling process |
Non-Patent Citations (1)
| Title |
|---|
| 美国国家环境保护局: "《污染预防与能源效率工业评估指南》", 30 November 2003, 北京：中国环境科学出版社,， * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109701934A (en) * | 2018-11-24 | 2019-05-03 | 关海洋 | Annealing furnace cleaning method for stainless steel band production |
| CN111893477A (en) * | 2020-07-31 | 2020-11-06 | 阴通明 | Stainless steel workpiece passivation process |
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Application publication date: 20170510 |