CN104419924A - Passivation technology of ultra-pure ferritic stainless steel - Google Patents
Passivation technology of ultra-pure ferritic stainless steel Download PDFInfo
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- CN104419924A CN104419924A CN201310403405.5A CN201310403405A CN104419924A CN 104419924 A CN104419924 A CN 104419924A CN 201310403405 A CN201310403405 A CN 201310403405A CN 104419924 A CN104419924 A CN 104419924A
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/34—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing fluorides or complex fluorides
Abstract
The invention discloses a passivation technology of ultra-pure ferritic stainless steel. The passivation technology comprises the following steps: (1) cleaning: cleaning an ultra-pure ferritic stainless steel work-piece with water in a constant-temperature state; (2) drying: airing the work-piece in a clean environment; (3) polishing: putting the dried work-piece on a polishing machine and polishing the external surface of the work-piece so that no obvious scale cinder is formed on the work-piece surface; (4) passivating: soaking the work-piece in a constant-temperature hydrofluoric acid and corrosion inhibitor imidazoline mixed passivation solution for 3-8 minutes; (5) cleaning: cleaning away a residual passivation solution of the work-piece in clean water of which the temperature is 60-70 DEG C; and (6) drying: putting the cleaned work-piece in a drying case, drying at 180-220 DEG C for 2 hours, taking out and cooling to room temperature. The passivation technology has the beneficial effect that the technical problem of under-pickling or over-pickling of the ultra-pure ferritic stainless steel in practical production is successfully solved.
Description
Technical field
The present invention relates to the passivation technology of super-purity ferrite stainless steel, belong to the process of surface treatment field of super-purity ferrite stainless steel.
Background technology
In current production, life, austenitic stainless steel application is very extensive, and along with the fluctuation of international nickel valency, be badly in need of a kind of cheap, material of good performance carrys out alternative austenitic stainless steel.
Super-purity ferrite stainless steel, as a kind of type material, not only has common ferritic stainless steel cheap, excellent thermal conductivity, magnetic diffusivity, the features such as anticorrosion stress-resistant, and reduces the foreign matter contents such as C, N well, significantly improves toughness.But delayed due to this type material passivating technique, but governs the widespread use of super-purity ferrite stainless steel.The passivating technique that current super-purity ferrite stainless steel uses in producing is the acid wash passivation technology following austenitic stainless steel mostly, although there is certain effect, but still there is pickling quality instability, the problem of quality dissatisfaction.
Super-purity ferrite stainless steel is in the production process of reality, and the acid wash passivation problem faced is mainly deficient pickling or overpickling.Domesticly there is no the Novel pickling passivation technology being applicable to super-purity ferrite stainless steel.
Summary of the invention
Technical problem to be solved by this invention is: the passivation technology providing super-purity ferrite stainless steel, improve super-purity ferrite stainless steel acid washing passivation technology in the past, solve the deficient pickling in super-purity ferrite stainless steel acid cleaning process or overpickling problem, obtain the super-purity ferrite stainless steel workpiece of high resistance to corrosion performance.
The present invention is achieved by the following technical solutions: the passivation technology of super-purity ferrite stainless steel, comprises the steps:
(1) clean, under normal temperature state, super-purity ferrite stainless steel workpiece water is cleaned;
(2) dry, workpiece is dried in clean environment;
(3) polishing, is placed on dried workpiece on polishing machine and carries out sanding and polishing to outer surface of workpiece, makes workpiece surface not have obvious oxide skin;
(4) passivation, soaks workpiece 3 ~ 8 minutes in normal temperature hydrofluoric acid+inhibiter tetrahydroglyoxaline passivating solution;
(5) cleaning, is the remaining passivating solution of cleaning workpiece in the clear water of 60-70 DEG C in temperature;
(6) dry, the workpiece after cleaning is placed in drying baker, at 180-220 DEG C after dry 2 hours, takes out and be cooled to room temperature.
Described step (4) normal temperature hydrofluoric acid+inhibiter tetrahydroglyoxaline passivating solution: the mass percent of hydrofluoric acid is 30% ~ 45%, the mass percent of inhibiter tetrahydroglyoxaline is 0.1% ~ 1%, and all the other compositions are water.
Described step (1), soaks skimming treatment in 20 ~ 30 seconds by super-purity ferrite stainless steel workpiece before cleaning, is conducive to the greasy dirt, the dust and other impurities that better remove super-purity ferrite stainless steel workpiece surface in dehydrated alcohol skim soln.
The invention has the beneficial effects as follows: the passivation technology adopting super-purity ferrite stainless steel described in the invention, super-purity ferrite stainless steel workpiece surface defines complete, fine and close passive film, and its visual appearance is good, and corrosion resistance significantly promotes.Successfully solve the technical barrier that super-purity ferrite stainless steel owes pickling or overpickling in actual production.
Embodiment
Below in conjunction with embodiment, the present invention will be further described.
Only be shown in table 1 for three embodiment lists below.
Table 1
The data detecting workpiece corrosion inhibition rate η are respectively:
Embodiment 1 sample: 69.737%,
Embodiment 2 sample: 71.492%
Embodiment 3 sample: 82.272%
Detect workpiece corrosion inhibition rate η method to illustrate:
Inhibition efficiency η action effect value, for examining the quality of pickling quality.
η=(I
corr-I′
corr)／I
corr×100％
In formula, I
corrwith I '
corrthe corrosion electric current density recorded in pickle solution under being respectively condition as a comparison and under different condition.
Detection method is described below: adopt CS350 type electrochemical workstation, wherein dynamic potential polarization curve scanning speed is 0.2V/s, and data sample rates is 1s/ time, and test soln is 3.5% saturated NaCl solution.Electrolyzer adopts three-electrode system, and reference electrode is saturated calomel electrode, and supporting electrode is platinum electrode, stainless steel working electrode epoxy encapsulation, and exposed area is 10mm
2, current potential is the current potential relative to saturated calomel electrode (SCE).Experimental test data is as table 2:
Table 2
More than show the passivation technology adopting super-purity ferrite stainless steel described in the invention, sample corrosion inhibition rate data are satisfactory, sample corrosion resistance significantly promotes, use German Carl Zeiss Inc. Axio Scope.Al metallography microscope sem observation sample appearance quality, sample surfaces defines complete, fine and close passive film, its visual appearance is good, successfully solves the technical barrier that super-purity ferrite stainless steel owes pickling or overpickling in actual production.
As described above, be only preferred embodiment of the present invention, is not used for limiting practical range of the present invention, and namely all equalizations done according to the present invention change and modify, and are all the claims in the present invention scope and contain, illustrate no longer one by one here.
Claims (2)
1. the passivation technology of super-purity ferrite stainless steel, is characterized in that: comprise the steps:
(1) clean, under normal temperature state, super-purity ferrite stainless steel workpiece water is cleaned;
(2) dry, workpiece is dried in clean environment;
(3) polishing, is placed on dried workpiece on polishing machine and carries out sanding and polishing to outer surface of workpiece, makes workpiece surface not have obvious oxide skin;
(4) passivation, soaks workpiece 3 ~ 8 minutes in normal temperature hydrofluoric acid+inhibiter tetrahydroglyoxaline passivating solution;
(5) cleaning, is the remaining passivating solution of cleaning workpiece in the clear water of 60 DEG C-70 DEG C in temperature;
(6) dry, the workpiece after workpiece cleaning is placed in drying baker, at 180 DEG C-220 DEG C after dry 2 hours, takes out and be cooled to room temperature.
Described step (4) normal temperature hydrofluoric acid+inhibiter tetrahydroglyoxaline passivating solution: the mass percent of hydrofluoric acid is 30% ~ 45%, the mass percent of inhibiter tetrahydroglyoxaline is 0.1% ~ 1%, and all the other compositions are water.
2. the passivation technology of super-purity ferrite stainless steel according to claim 1, is characterized in that: described step (1), before cleaning, super-purity ferrite stainless steel workpiece is soaked skimming treatment in 20 ~ 30 seconds in dehydrated alcohol skim soln.
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| CN201310403405.5A CN104419924B (en) | 2013-09-09 | 2013-09-09 | The passivation technology of super-purity ferrite stainless steel |
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| CN201310403405.5A CN104419924B (en) | 2013-09-09 | 2013-09-09 | The passivation technology of super-purity ferrite stainless steel |
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| CN104419924A true CN104419924A (en) | 2015-03-18 |
| CN104419924B CN104419924B (en) | 2017-06-06 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105018914A (en) * | 2015-07-31 | 2015-11-04 | 瑞声光电科技(常州)有限公司 | Treatment method for ferrite stainless steel |
| CN106756943A (en) * | 2016-12-16 | 2017-05-31 | 安徽宝恒新材料科技有限公司 | A kind of deactivating process for the treatment of of stainless steel |
| CN112538623A (en) * | 2020-12-01 | 2021-03-23 | 上海易慧机电科技有限公司 | Stainless steel surface passivation process |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1004212B (en) * | 1986-07-07 | 1989-05-17 | 上海大明铁工厂 | Acid washing-passivating paste for stainless steel |
| CN100557084C (en) * | 2007-04-02 | 2009-11-04 | 李青 | Direct chromium stainless-steel pickling agent |
| CN101831659B (en) * | 2009-03-09 | 2013-05-29 | 鞍钢股份有限公司 | Pickling inhibitor and using method thereof |
| CN101671552B (en) * | 2009-09-28 | 2012-05-16 | 大庆油田有限责任公司 | Silicate scale clearing agent for ternary combination flooding extraction well |
| CN101787525A (en) * | 2009-12-24 | 2010-07-28 | 四川省广汉华威铝业有限公司 | Stainless steel passivation process |
| CN102653868B (en) * | 2012-03-14 | 2016-01-13 | 王福平 | Environment-friendly type acid-washing stainless steel passivating solution |
-
2013
- 2013-09-09 CN CN201310403405.5A patent/CN104419924B/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105018914A (en) * | 2015-07-31 | 2015-11-04 | 瑞声光电科技(常州)有限公司 | Treatment method for ferrite stainless steel |
| CN106756943A (en) * | 2016-12-16 | 2017-05-31 | 安徽宝恒新材料科技有限公司 | A kind of deactivating process for the treatment of of stainless steel |
| CN112538623A (en) * | 2020-12-01 | 2021-03-23 | 上海易慧机电科技有限公司 | Stainless steel surface passivation process |
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| CN104419924B (en) | 2017-06-06 |
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