CN106319501A - Passivation technology for stainless steel flange - Google Patents
Passivation technology for stainless steel flange Download PDFInfo
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- CN106319501A CN106319501A CN201510386926.3A CN201510386926A CN106319501A CN 106319501 A CN106319501 A CN 106319501A CN 201510386926 A CN201510386926 A CN 201510386926A CN 106319501 A CN106319501 A CN 106319501A
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Abstract
The invention discloses a passivation technology for a stainless steel flange. The passivation technology comprises the following steps: (1) passivation solution preparation: a passivation solution comprises 1.8%-2.2% by volume of hydrofluoric acid, 4.5%-5.2% by volume of nitric acid and the balance of water, a defined amount of water is placed in a container, half hydrofluoric acid is poured into the water, then nitric acid and the rest of hydrofluoric acid are poured into the water, the materials are stirred and mixed, and the container is covered and left to stand for half an hour; (2) passivation processing: the machined stainless steel flange is placed in the passivation solution at the temperature of 20-30 DEG C and soaked for half an hour; and (3) washing: the passivated stainless steel flange is washed in normal-temperature water. The passivation technology for the stainless steel flange adopts simple steps, acid pickling or caustic washing is not needed before passivation, the passivated stainless steel flange is washed only once, labor hours, manpower and cost are saved, the passivation solution is simple to prepare and practical, and passivation conditions are realized more easily by only performing a passivation reaction at the normal temperature.
Description
Technical field
The invention belongs to steel flange processing technique, particularly relate to steel flange passivation processing technique.
Background technology
Steel flange is the accessory connecting the pipelines such as petrochemical industry, has super bearing capacity, switching performance is good, be easy to connect and the feature of fastening, is requisite significant components in petrochemical pipe assembling process.Steel flange can occur the phenomenons such as burn into air slaking during life-time service, for preventing these phenomenons from causing steel flange shortening in service life, steel flange typically can carry out surface passivation, form one layer of passivating film.Traditional steel flange passivation technology step is comparatively laborious, needs alkali cleaning or pickling, and passivating dip preparation is more complicated before passivation, and passivating conditions is harsher.
Summary of the invention
In order to solve the problems referred to above, the invention provides a kind of step simple and be effectively formed the steel flange passivation technology of passivating film.
According to an aspect of the present invention, it is provided that a kind of steel flange passivation technology, comprise the following steps:
(1) passivating solution is made, described passivating solution includes water, Fluohydric acid. and nitric acid, the volume fraction of described Fluohydric acid. and nitric acid is respectively 1.8-2.2% and 4.5-5.2%, remaining is water, place gauge water in a reservoir, the Fluohydric acid. of half is poured into water, then nitric acid and remaining Fluohydric acid. are poured into water, stirring mixing, container is added a cover and is stood half an hour；
(2) passivation processing, is placed in the steel flange machined in the passivating solution of 20-30 DEG C, and soaks half an hour；
(3) washing, steel flange passivation completed is placed in normal-temperature water flushing.
It provides the benefit that: in the present invention, steel flange passivation technology step is simple, need not pickling or alkali cleaning before passivation, washes steel flange once after passivation, saves manpower in man-hour and cost, simultaneously works as certain environmental-protection function；The preparation of passivating solution is simple and practical, it is not necessary to multiple acid solution, ensure that steel flange surface is effectively passivated simultaneously, forms the passivating film of one layer of 0.5-0.8mm；Passivating conditions is easier to realize, and is passivated reacting under room temperature.
Detailed description of the invention
Below by embodiment, the present invention is further illustrated.The invention provides a kind of steel flange passivation technology, comprise the following steps:
(1) passivating solution is made, described passivating solution includes water, Fluohydric acid. and nitric acid, the volume fraction of described Fluohydric acid. and nitric acid is respectively 1.8-2.2% and 4.5-5.2%, remaining is water, place gauge water in a reservoir, the Fluohydric acid. of half is poured into water, then nitric acid and remaining Fluohydric acid. are poured into water, stirring mixing, container is added a cover and is stood half an hour；
(2) passivation processing, is placed in the steel flange machined in the passivating solution of 20-30 DEG C, and soaks half an hour；
(3) washing, steel flange passivation completed is placed in normal-temperature water flushing.
Embodiment 1
First, preparation passivating solution, place quantitative water in a reservoir, it is respectively 4.9% and 2.0% pair of Fluohydric acid. and nitric acid quantitative Analysis according to Fluohydric acid. and nitric acid volume fraction in the solution, the Fluohydric acid. of its half is first poured into water, then nitric acid and remaining Fluohydric acid. is poured into water, stirring mixing, container is added a cover and is stood half an hour, stand-by；The steel flange machined is placed in the passivating solution of 25 DEG C, soaks half an hour；Halfhour steel flange will be soaked take out, carry out clear water flushing, and complete to be passivated steel flange surface and form the passivating film of one layer of 0.5-0.8mm.
Embodiment 2
First, preparation passivating solution, place quantitative water in a reservoir, it is respectively 4.5% and 2.2% pair of Fluohydric acid. and nitric acid quantitative Analysis according to Fluohydric acid. and nitric acid volume fraction in the solution, the Fluohydric acid. of its half is first poured into water, then nitric acid and remaining Fluohydric acid. is poured into water, stirring mixing, container is added a cover and is stood half an hour, stand-by；The steel flange machined is placed in the passivating solution of 20 DEG C, soaks half an hour；Halfhour steel flange will be soaked take out, carry out clear water flushing, and complete to be passivated steel flange surface and form the passivating film of one layer of 0.5-0.8mm.
Embodiment 3
First, preparation passivating solution, place quantitative water in a reservoir, it is respectively 5.2% and 1.8% pair of Fluohydric acid. and nitric acid quantitative Analysis according to Fluohydric acid. and nitric acid volume fraction in the solution, the Fluohydric acid. of its half is first poured into water, then nitric acid and remaining Fluohydric acid. is poured into water, stirring mixing, container is added a cover and is stood half an hour, stand-by；The steel flange machined is placed in the passivating solution of 30 DEG C, soaks half an hour；Halfhour steel flange will be soaked take out, carry out clear water flushing, and complete to be passivated steel flange surface and form the passivating film of one layer of 0.5-0.8mm.
Above-described is only some embodiments of the present invention, it is noted that for the person of ordinary skill of the art, on the premise of the creation without departing from the present invention is conceived, it is also possible to making other deformation and improve, these broadly fall into protection scope of the present invention.
Claims (1)
1. a steel flange passivation technology, it is characterised in that comprise the following steps:
(1) passivating solution is made, described passivating solution includes water, Fluohydric acid. and nitric acid, the volume fraction of described Fluohydric acid. and nitric acid is respectively 1.8-2.2% and 4.5-5.2%, remaining is water, place gauge water in a reservoir, the Fluohydric acid. of half is poured into water, then nitric acid and remaining Fluohydric acid. are poured into water, stirring mixing, container is added a cover and is stood half an hour；
(2) passivation processing, is placed in the steel flange machined in the passivating solution of 20-30 DEG C, and soaks half an hour；
(3) washing, steel flange passivation completed is placed in normal-temperature water flushing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510386926.3A CN106319501A (en) | 2015-07-06 | 2015-07-06 | Passivation technology for stainless steel flange |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510386926.3A CN106319501A (en) | 2015-07-06 | 2015-07-06 | Passivation technology for stainless steel flange |
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| Publication Number | Publication Date |
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| CN106319501A true CN106319501A (en) | 2017-01-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201510386926.3A Pending CN106319501A (en) | 2015-07-06 | 2015-07-06 | Passivation technology for stainless steel flange |
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| CN (1) | CN106319501A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108611639A (en) * | 2018-07-10 | 2018-10-02 | 昆山迪卡特精密电子有限公司 | Steel disc etch passivation surface treatment |
| CN109822301A (en) * | 2019-04-02 | 2019-05-31 | 瑞安市永泰精密铸造厂 | The processing method of steel flange |
| CN111809171A (en) * | 2020-07-10 | 2020-10-23 | 常熟市东升法兰有限公司 | Stainless steel flange passivation technology |
| CN111889966A (en) * | 2020-07-07 | 2020-11-06 | 山东天原管业股份有限公司 | Method for processing flange for water pump |
| CN112267108A (en) * | 2020-09-17 | 2021-01-26 | 苏州汇铭源工业零部件有限公司 | Method for improving corrosion resistance of stainless steel fastener |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20070084703A (en) * | 2006-02-21 | 2007-08-27 | 엘에스전선 주식회사 | Methods for preventing the discoloration of copper wire |
| CN101585038A (en) * | 2009-06-30 | 2009-11-25 | 四川科新机电股份有限公司 | Stainless steel pipe cleaning method |
| CN102965675A (en) * | 2011-09-01 | 2013-03-13 | 沈阳远大铝业工程有限公司 | Pickling passivation method of stainless steel |
-
2015
- 2015-07-06 CN CN201510386926.3A patent/CN106319501A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20070084703A (en) * | 2006-02-21 | 2007-08-27 | 엘에스전선 주식회사 | Methods for preventing the discoloration of copper wire |
| CN101585038A (en) * | 2009-06-30 | 2009-11-25 | 四川科新机电股份有限公司 | Stainless steel pipe cleaning method |
| CN102965675A (en) * | 2011-09-01 | 2013-03-13 | 沈阳远大铝业工程有限公司 | Pickling passivation method of stainless steel |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108611639A (en) * | 2018-07-10 | 2018-10-02 | 昆山迪卡特精密电子有限公司 | Steel disc etch passivation surface treatment |
| CN109822301A (en) * | 2019-04-02 | 2019-05-31 | 瑞安市永泰精密铸造厂 | The processing method of steel flange |
| CN111889966A (en) * | 2020-07-07 | 2020-11-06 | 山东天原管业股份有限公司 | Method for processing flange for water pump |
| CN111809171A (en) * | 2020-07-10 | 2020-10-23 | 常熟市东升法兰有限公司 | Stainless steel flange passivation technology |
| CN112267108A (en) * | 2020-09-17 | 2021-01-26 | 苏州汇铭源工业零部件有限公司 | Method for improving corrosion resistance of stainless steel fastener |
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Application publication date: 20170111 |
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