CN110592566A - Stainless steel passivator and passivation process thereof - Google Patents
Stainless steel passivator and passivation process thereof Download PDFInfo
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- CN110592566A CN110592566A CN201910827711.9A CN201910827711A CN110592566A CN 110592566 A CN110592566 A CN 110592566A CN 201910827711 A CN201910827711 A CN 201910827711A CN 110592566 A CN110592566 A CN 110592566A
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- stainless steel
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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
- C23C22/24—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 hexavalent chromium compounds
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- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
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- Organic Chemistry (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention discloses a stainless steel passivator and a passivation process thereof. The stainless steel passivation process comprises the following steps: oil and wax removal: removing surface dirt of a stainless steel blank by using an oil and wax removing solution, and then cleaning the stainless steel blank by using three times of water; passivation: passivating by using a passivating agent; cleaning: cleaning the surface passivator by three times of water washing and one time of ultrasonic water washing; and (3) drying: and (4) drying or airing. The stainless steel passivator comprises 45-50g/L potassium dichromate and 300-350ml/L nitric acid. The stainless steel passivation process can effectively improve the salt spray resistance experiment capability of the stainless steel; meanwhile, the cleanliness of the surface of the stainless steel can be improved, and the daily service cycle of stainless steel products is greatly prolonged.
Description
Technical Field
The invention relates to a stainless steel passivator and a passivating process thereof.
Background
In the products processed by using stainless steel as a base material at present, corrosion conditions such as point corrosion, intergranular corrosion, abrasion corrosion and the like still exist, and the corrosion conditions are related to the surface state of the stainless steel, and secondly, most of the surfaces of the stainless steel have insufficient cleanliness, and the surfaces of the stainless steel contain partial metal pollutants, including impurities embedded in the stainless steel, such as copper, zinc, cadmium, lead, low-melting metals, free iron and the like. Contamination of these metals easily leads to corrosion damage of stainless steel. In order to solve the problem, a passivation mode can be adopted to eliminate the initiation source of each corrosion, and simultaneously, chromium and nickel contained in the surface of the stainless steel can be enriched and stabilized.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a stainless steel passivator and a passivation process thereof.
The invention is realized by the following technical scheme:
a stainless steel passivation process comprises the following steps:
1) oil and wax removal: removing surface dirt of a stainless steel blank by using an oil and wax removing solution, and then cleaning the stainless steel blank by using three times of water;
2) passivation: passivating by using a passivating agent;
3) cleaning: cleaning the surface passivator by three times of water washing and one time of ultrasonic water washing;
4) and (3) drying: and (4) drying or airing.
Preferably, the passivating agent comprises 45-50g/L potassium dichromate and 300-350ml/L nitric acid.
Preferably, the stainless steel blank is placed in a passivation tank during passivation, the ultrasonic is started in the passivation tank, and an ultrasonic intensity detector is used for detecting and controlling the ultrasonic intensity to be 0.3-1.0W/cm2In the meantime.
Preferably, the passivation temperature during passivation is not higher than 52 ℃.
Preferably, the passivation temperature during passivation is controlled to be 48-52 ℃.
Preferably, the passivation time is controlled to be 40-45 minutes.
Preferably, the temperature of the degreasing and dewaxing solution for removing the surface dirt is controlled to be 55-65 ℃.
Preferably, the step 4) is drying by using an oven at the temperature of less than 180 ℃.
The invention has the following beneficial effects: the stainless steel passivation process can effectively improve the salt spray resistance experiment capability of the stainless steel; meanwhile, the cleanliness of the surface of the stainless steel can be improved, and the daily service cycle of stainless steel products is greatly prolonged.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.
Referring to the attached figure 1 of the specification, the invention discloses a stainless steel passivator and a passivation process thereof, wherein after passivation treatment is carried out on a metal surface by a stainless steel passivation solution, a very compact passivation film which has good coverage and is firmly adsorbed on the metal surface can be generated on the metal surface, so that the metal has better corrosion resistance, and the effects of prolonging the rusting time of the metal and effectively protecting the metal are achieved, and the passivation process mainly comprises the following steps:
1) wax and oil removal: at the temperature of 55-65 ℃, wax and oil removing agents are used for removing wax and oil from stainless steel blanks;
2) washing with water: cleaning with normal temperature purified water;
3) passivation: passivating the washed stainless steel blank, wherein the passivating agent comprises the following components: 45-50g/L potassium dichromate and 350ml/L nitric acid of 300-And controlling the ultrasonic intensity at 0.3-1.0W/cm2Controlling the temperature of the passivating agent to be 48-52 ℃ and the passivating time to be 40-45 min;
4) washing with water: washing with normal-temperature purified water for three times, and washing with ultrasonic water for one time to ensure that the surface of the passivant remained is cleaned;
5) drying: oven drying or air drying at a temperature below 180 deg.C.
The specific embodiment is as follows: cleaning a 40pcs stainless steel blank by using an oil and wax removing solution, passivating 20pcs stainless steel blanks, and washing and drying the 20pcs stainless steel blanks by water as a reference experiment;
placing the washed 20pcs stainless steel blank in a passivation tank with the formula concentration of 50g/L potassium dichromate and 300ml/L nitric acid, starting ultrasound, and controlling the ultrasound intensity to be 0.5W/cm2Controlling the temperature to be 48-50 ℃, passivating for 40min, taking out the stainless steel blank after the time is up, washing with three pure water, then washing with ultrasonic water, and drying;
the CASS test (copper salt accelerated acetate spray test) is carried out on the 20pcs stainless steel blank only subjected to oil removal and wax removal and the passivated 20pcs stainless steel blank at the same time, and the test result shows that when the CASS test is carried out on the unpassivated stainless steel blank, 20-50% of tawny corrosion begins to appear on the 20pcs stainless steel blank only subjected to oil removal and wax removal after 8 hours, and the surface state of the passivated stainless steel blank is still good after 24 hours.
While the foregoing description shows and describes the preferred embodiments of the present invention, it is to be understood that the invention is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as described herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. A stainless steel passivation process is characterized by comprising the following steps:
1) oil and wax removal: removing surface dirt of a stainless steel blank by using an oil and wax removing solution, and then cleaning the stainless steel blank by using three times of water;
2) passivation: passivating by using a passivating agent;
3) cleaning: cleaning the surface passivator by three times of water washing and one time of ultrasonic water washing;
4) and (3) drying: and (4) drying or airing.
2. The stainless steel passivation process according to claim 1, wherein the passivating agent comprises 45-50g/L potassium dichromate and 300-350ml/L nitric acid.
3. A stainless steel passivation process according to claim 1 or 2, characterized in that during passivation, the stainless steel blank is placed in a passivation tank, and ultrasonic is started in the passivation tank, and the ultrasonic intensity is detected and controlled to be 0.3-1.0W/cm by an ultrasonic intensity detector2In the meantime.
4. A process according to claim 3, wherein the passivation temperature is not higher than 52 ℃ during passivation.
5. A passivation process for stainless steel according to claim 4, characterized in that the passivation temperature during passivation is controlled at 48-52 ℃.
6. A process according to claim 4 or 5, wherein the passivation time is controlled to be 40-45 minutes.
7. A process according to any one of claims 1 to 6, wherein the de-waxing solution is controlled to remove surface soils at a temperature of 55 to 65 ℃.
8. A process according to any one of claims 1 to 6, wherein step 4) is baking in an oven at a temperature below 180 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910827711.9A CN110592566A (en) | 2019-09-03 | 2019-09-03 | Stainless steel passivator and passivation process thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910827711.9A CN110592566A (en) | 2019-09-03 | 2019-09-03 | Stainless steel passivator and passivation process thereof |
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| CN110592566A true CN110592566A (en) | 2019-12-20 |
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| CN201910827711.9A Pending CN110592566A (en) | 2019-09-03 | 2019-09-03 | Stainless steel passivator and passivation process thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112547460A (en) * | 2020-11-27 | 2021-03-26 | 上海湿腾电器有限公司 | Corrosion prevention process for offshore wind power generation rotary dehumidifier and salt mist purification filter unit |
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| US4026737A (en) * | 1974-10-22 | 1977-05-31 | Nippon Steel Corporation | Method for coloring a stainless steel |
| JP2000169942A (en) * | 1998-12-03 | 2000-06-20 | Daido Steel Co Ltd | Free-cutting martensitic stainless steel excellent in outgas resistance and corrosion resistance and method for working stainless steel parts |
| CN101343739A (en) * | 2008-09-01 | 2009-01-14 | 铁道部运输局 | Acid washing passivation technology for stainless steel |
| 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 |
| CN102220591A (en) * | 2011-07-26 | 2011-10-19 | 扬州华宇管件有限公司 | Pickling and passivating treatment process for stainless steel pipes |
| CN106835096A (en) * | 2016-12-20 | 2017-06-13 | 张家港市固业金属制品有限公司 | A kind of process of surface treatment of aluminum die-casting part |
| CN109468629A (en) * | 2018-12-24 | 2019-03-15 | 重庆大学 | Environment-friendly type stainless steel work-piece passivation technology |
-
2019
- 2019-09-03 CN CN201910827711.9A patent/CN110592566A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4026737A (en) * | 1974-10-22 | 1977-05-31 | Nippon Steel Corporation | Method for coloring a stainless steel |
| JP2000169942A (en) * | 1998-12-03 | 2000-06-20 | Daido Steel Co Ltd | Free-cutting martensitic stainless steel excellent in outgas resistance and corrosion resistance and method for working stainless steel parts |
| CN101343739A (en) * | 2008-09-01 | 2009-01-14 | 铁道部运输局 | Acid washing passivation technology for stainless steel |
| 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 |
| CN102220591A (en) * | 2011-07-26 | 2011-10-19 | 扬州华宇管件有限公司 | Pickling and passivating treatment process for stainless steel pipes |
| CN106835096A (en) * | 2016-12-20 | 2017-06-13 | 张家港市固业金属制品有限公司 | A kind of process of surface treatment of aluminum die-casting part |
| CN109468629A (en) * | 2018-12-24 | 2019-03-15 | 重庆大学 | Environment-friendly type stainless steel work-piece passivation technology |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112547460A (en) * | 2020-11-27 | 2021-03-26 | 上海湿腾电器有限公司 | Corrosion prevention process for offshore wind power generation rotary dehumidifier and salt mist purification filter unit |
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