CN112553612A - Synchronous pickling passivation method for stainless steel parts - Google Patents
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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
- C23C22/48—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 not containing phosphates, hexavalent chromium compounds, fluorides or complex fluorides, molybdates, tungstates, vanadates or oxalates
- C23C22/50—Treatment of iron or alloys based thereon
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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
- C23C22/78—Pretreatment of the material to be coated
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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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
- C23G1/085—Iron or steel solutions containing HNO3
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The invention provides a synchronous pickling passivation method of stainless steel parts, which sequentially comprises the following steps of 1, preliminarily removing oil from the stainless steel parts; step 2, further removing oil by adopting electrochemistry; step 3, carrying out hot water washing at the temperature of 60-80 ℃ for 0.5-1 min; step 4, cleaning, namely cleaning for many times by using running tap water; step 5, adopting an acid pickling passivation solution to carry out acid pickling and passivation at room temperature; step 6, cleaning, namely cleaning for many times by using running tap water; step 7, drying, namely drying after blow-drying; and 8, packaging, namely packaging the treated stainless steel parts by using packaging paper. In the step 5, the pickling passivation solution is composed of the following components in mass concentration: 20-30 g/L of nitric acid, 2-5 g/L of butynediol, 3-5 g/L, R g/L of hydroxy ethylidene diphosphonic acid-5-8 g/L of fog inhibitor and 3-5 g/L of hydrogen peroxide. The pickling passivation solution prepared by the invention does not cause great harm to the environment and personnel, and the pickling and passivation processes are carried out together, so that the glossiness and the corrosion resistance of a passivation film are improved.
Description
Technical Field
The invention belongs to the technical field of surface treatment, pickling and passivation chemical treatment processes, and particularly relates to a synchronous pickling and passivation method for stainless steel parts.
Background
The pickling principle of stainless steel is that the chemical components of stainless steel and heat-resistant steel contain more nickel, chromium and other metal elements resistant to thermal oxidation and corrosion, so that a layer of compact chromium oxide, nickel oxide and iron chromium oxide (FeO. Cr) which is very insoluble in acid is formed on the surface after high-temperature treatment2O3) And the like, and in order to effectively remove the oxides, an acid solution with strong oxidizing power is required to be used, so that the low-price ferrochrome oxides in the oxide layer are firstly promoted to be converted into high-price compounds, the loosening is started through the change of the oxide structure, the adhesive force on the surface of the substrate is reduced, and the oxides are dissolved and stripped.
The current stainless steel part acid pickling passivation surface treatment process flow comprises part organic solvent oil removal → electrochemical oil removal → hot water washing → flowing water washing → loose oxide skin → flowing water washing → acid pickling → flowing water washing → passivation → flowing water washing → drying → packaging.
The surface and the appearance of the stainless steel part treated by the method are gray and not bright, and a film integrity test is carried out after passivation, namely a drip set test method HB5292-84 firstly uses a black marking pen to draw a circle on a stainless steel passivation test piece close to the center, uses a dropper to drip 1-2 drops of prepared drip test solution in the circle, simultaneously starts a stopwatch, wipes the test solution dry after 5 minutes, and checks whether deposited copper exists at the place. The drop test solution comprises 8g of copper sulfate (analytically pure), 2ml of sulfuric acid (analytically pure), and distilled water till 500ml, and is dropped at room temperature for 3min to locally form copper rust, and the drop test fails and needs to be repaired for multiple times.
Disclosure of Invention
The invention provides a synchronous pickling and passivating method for stainless steel parts, aiming at overcoming the problems that the existing pickling process is aged, the prepared solution causes great damage to the environment and personnel, the surfaces of the parts are not smooth after the stainless steel parts are pickled and passivated, and a passivation film layer is discolored. The method can obviously improve the surface glossiness of the stainless steel part after acid cleaning and passivation and the corrosion resistance of the passivation film.
The technical scheme adopted by the invention is as follows:
a synchronous pickling passivation method of stainless steel parts, which sequentially comprises the following steps,
step 1, preliminarily removing oil from a stainless steel part;
step 2, further removing oil by adopting electrochemistry;
step 3, carrying out hot water washing at the temperature of 60-80 ℃ for 0.5-1 min;
step 4, cleaning, namely cleaning for many times by using running tap water;
step 5, adopting an acid pickling passivation solution to carry out acid pickling and passivation at room temperature;
step 6, cleaning, namely cleaning for many times by using running tap water;
step 7, drying, namely drying after blow-drying;
and 8, packaging, namely packaging the treated stainless steel parts by using packaging paper.
In the step 5, the pickling passivation solution is composed of the following components in mass concentration: 20-30 g/L of nitric acid, 2-5 g/L of butynediol, 3-5 g/L, R g/L of hydroxy ethylidene diphosphonic acid-5-8 g/L of fog inhibitor and 3-5 g/L of hydrogen peroxide.
In the step 5, the pickling passivation solution is pickled and passivated for 8-20 minutes at room temperature.
In the step 1, 180 # gasoline is adopted to soak, clean and scrub oil stains on the surface of the stainless steel part or ultrasonic equipment is used for removing oil from the stainless steel part.
In the step 1, the temperature of bath solution adopted by electrochemical oil removal is 60-80 ℃, the current density is 2-5A/dm 2, and the time is 5-10 min.
The bath solution adopted by the electrochemical oil removal comprises 60-80 g/L of sodium hydroxide, 20-40 g/L of sodium carbonate, 50-70 g/L of trisodium phosphate and 10-15 g/L of sodium silicate.
In the step 4, the stainless steel is treated in the step 3, and under the condition of thick scale, scale loosening is required, wherein the bath solution for loosening the scale comprises the following components: 500-700 g/L of sodium hydroxide, 200-250 g/L of sodium nitrate, and the temperature of the bath solution is 135-145 ℃ for 10-30 min; after the completion, the plate was washed with running tap water for several times and then subjected to acid washing in the subsequent step 5.
The cleaning is performed for 2-3 times by using flowing tap water.
The blow-drying in the step 7 is low-pressure air blow-drying; the drying is carried out at the temperature of 50-60 ℃ for 20-30 min.
In the step 5, the pickling passivation solution is composed of the following components in mass concentration: 25g/L of nitric acid, 3g/L of butynediol, 4g/L, R g of hydroxyethylidene diphosphonic acid-7 g/L of fog inhibitor and 4g/L of hydrogen peroxide.
The invention has the beneficial effects that:
the pickling and passivating solution prepared by the invention does not cause great harm to the environment and personnel, and the pickling and passivating processes are carried out together. The method can obviously improve the surface glossiness of the stainless steel part after acid cleaning and passivation and the corrosion resistance of the passivation film.
Detailed Description
Example 1:
the invention provides a synchronous pickling and passivating method for stainless steel parts, aiming at overcoming the problems that the existing pickling process is aged, the prepared solution causes great damage to the environment and personnel, the surfaces of the parts are not smooth after the stainless steel parts are pickled and passivated, and a passivation film layer is discolored. The method can obviously improve the surface glossiness of the stainless steel part after acid cleaning and passivation and the corrosion resistance of the passivation film.
A stainless steel part synchronous pickling passivation method sequentially comprises the following steps of 1, preliminarily removing oil from a stainless steel part;
step 2, further removing oil by adopting electrochemistry;
step 3, carrying out hot water washing at the temperature of 60-80 ℃ for 0.5-1 min;
step 4, cleaning, namely cleaning for many times by using running tap water;
step 5, adopting an acid pickling passivation solution to carry out acid pickling and passivation at room temperature;
step 6, cleaning, namely cleaning for many times by using running tap water;
step 7, drying, namely drying after blow-drying;
and 8, packaging, namely packaging the treated stainless steel parts by using packaging paper.
The invention ensures and meets the requirements of smooth surface of the stainless steel part after acid cleaning and passivation, no discoloration of the passivation film layer, complete film layer and better corrosion resistance.
Example 2:
based on example 1, in this embodiment, preferably, in step 5, the pickling passivation solution is composed of the following components, and the mass concentrations of the components are: 20-30 g/L of nitric acid, 2-5 g/L of butynediol, 3-5 g/L, R g/L of hydroxy ethylidene diphosphonic acid-5-8 g/L of fog inhibitor and 40% of 3-5 g/L of hydrogen peroxide.
Preferably, in the step 5, the pickling passivation solution is pickled and passivated at room temperature for 8-20 minutes.
Preferably, in the step 1, the oil stain on the surface of the stainless steel part is cleaned and brushed by using 180 # gasoline or the stainless steel part is degreased by using ultrasonic equipment.
Preferably, in the step 1, the bath solution temperature adopted by the electrochemical oil removal is 60-80 ℃, the current density is 2-5A/dm 2, and the time is 5-10 min.
Preferably, the bath solution used for electrochemical oil removal comprises 60-80 g/L of sodium hydroxide, 20-40 g/L of sodium carbonate, 50-70 g/L of trisodium phosphate and 10-15 g/L of sodium silicate.
When electrochemical oil removal is carried out, the temperature, current density and time of bath solution must be controlled, the oil removal time is too short, and oil stains on the surface of stainless steel cannot be thoroughly removed; if the oil removal time is too long, the surface of the stainless steel becomes rough, and the surface smoothness is affected. When removing oil, the operator must carefully operate the oil remover.
Preferably, in step 4, the stainless steel after being treated in step 3 needs to be subjected to scale loosening when the scale is thick, and the bath solution for scale loosening has the following components: 500-700 g/L of sodium hydroxide, 200-250 g/L of sodium nitrate, and the temperature of the bath solution is 135-145 ℃ for 10-30 min; after the completion, the plate was washed with running tap water for several times and then subjected to acid washing in the subsequent step 5.
Preferably, the cleaning is performed for 2-3 times by using flowing tap water.
Preferably, the drying in the step 7 is low-pressure air drying; the drying is carried out at the temperature of 50-60 ℃ for 20-30 min.
The invention ensures and meets the requirements of smooth surface of the stainless steel part after acid cleaning and passivation, no discoloration of the passivation film layer, complete film layer and better corrosion resistance. The pickling and passivating solution prepared by the invention does not cause great harm to the environment and personnel, and the pickling and passivating processes are carried out together. The method can obviously improve the surface glossiness of the stainless steel part after acid cleaning and passivation and the corrosion resistance of the passivation film.
Example 3:
based on the embodiment 1 or 2, in this embodiment, preferably, in the step 5, the pickling passivation solution is composed of the following components, and the mass concentrations of the components are: 25g/L of nitric acid, 3g/L of butynediol, 4g/L, R g of hydroxyethylidene diphosphonic acid-7 g/L of fog inhibitor and 4g/L of hydrogen peroxide.
After the pickling passivation solution provided by the scheme acts for 8-20 minutes, the pickling passivation effect of the surface of the part meets the national standard detection requirement, the surface of the part is smooth and clean, the film layer is complete, and the corrosion resistance is good.
Example 4:
based on the embodiment 1 or 2, in this embodiment, preferably, in the step 5, the pickling passivation solution is composed of the following components, and the mass concentrations of the components are: 20g/L of nitric acid, 2g/L of butynediol, 3g/L, R g of hydroxyethylidene diphosphonic acid-5 g/L of fog inhibitor and 3g/L of hydrogen peroxide.
After the pickling passivation solution provided by the scheme acts for 8-20 minutes, the pickling passivation effect of the surface of the part meets the national standard detection requirement, the surface of the part is smooth and clean, the film layer is complete, and the corrosion resistance is good.
Example 5:
based on the embodiment 1 or 2, preferably, in the step 5, the pickling passivation solution is composed of the following components in mass concentration: 30g/L of nitric acid, 5g/L of butynediol, 5g/L, R g of hydroxyethylidene diphosphonic acid-8 g/L of fog inhibitor and 5g/L of hydrogen peroxide.
After the pickling passivation solution provided by the scheme acts for 8-20 minutes, the pickling passivation effect of the surface of the part meets the national standard detection requirement, the surface of the part is smooth and clean, the film layer is complete, and the corrosion resistance is good.
In the invention, the three solutions of pickling passivation solution given in examples 3-5 are tested for stainless steel parts, and the test procedures and results are as follows:
4 sets of 24 parts were tested using 96 pieces of stainless steel 1Cr18Ni9Ti sleeve, 8 parts were used for each pickling passivation solution protocol in examples 3-5.
The pickling passivation is divided into 4 groups according to different time lengths, and the time from the first group to the fourth group is respectively as follows: after 5 minutes, 10 minutes and 15 minutes and 20 minutes, taking out the parts from the solution after the pickling passivation time is finished, cleaning the parts, wherein the surfaces of the parts are smooth and clean, the passivation film is silvery white, 4 parts are taken out for a titration test in each group of tests, the test shows that the surfaces of the last 3 groups of test parts are not discolored, and the surface of the first group of test parts has 4 parts with local patina.
And performing a corrosion resistance test by adopting a saline soaking method HB 5292-84. The detection method comprises the following steps: and (3) immersing the part with the passivation film layer into a 3% sodium chloride aqueous solution, keeping the part at the temperature of 15-20 ℃ for 24 hours, taking out the part, and checking whether the surface is rusted. And 4 parts are taken out for testing in each group of the four groups, and are taken out from the solution after pickling and passivation for 5 minutes, 10 minutes, 15 minutes and 20 minutes, after the parts are cleaned, the surfaces of the parts are smooth and clean, a passivation film is silvery white, and then a corrosion resistance test is carried out, so that the surfaces of the later 3 groups of tested parts are not discolored, and 2-4 parts are locally corroded after the 1 st group of tests.
The passivation effect of acid pickling passivation for 5 minutes is not ideal.
And then respectively carrying out 2 groups of tests on each pickling and passivating solution scheme in the embodiment 3-5 by using 36 parts, wherein each group is subjected to pickling and passivating treatment by using 3 parts, the first group is subjected to pickling and passivating for 6 minutes, the second group is subjected to pickling and passivating for 8 minutes, the parts are taken out of the solution after the pickling and passivating time is over, the surfaces of the parts are smooth and clean, the passivating films are silvery white, each group of the schemes is subjected to titration tests by using 3 parts, the second group of parts of each pickling and passivating solution scheme in the embodiment 3-5 has no surface copper rust, the rest is subjected to corrosion resistance tests, 1-2 parts in the first group of parts of the three schemes (each pickling and passivating solution scheme in the embodiment 3-5) after the tests are carried out, and the surfaces of the parts of the second group in the three schemes have no rust. The passivation effect of the acid cleaning passivation time of 8 minutes meets the test requirements through tests.
4 sets of tests were carried out with 2Cr13 material parts, 10 parts per set, the test protocol being: and (3) pickling and passivating for 6 minutes, after 8 minutes, 15 minutes and 20 minutes, taking out the parts from the solution, cleaning the parts to be smooth and clean, wherein a passivation film is silvery white, and then carrying out a titration test. And carrying out corrosion resistance test, wherein after the test, the surface of 2-3 parts in the first group of parts is locally rusted, and the surfaces of other three groups of test pieces are unchanged.
The test shows that the passivation effect of the 2Cr13 material with the pickling passivation time of (8-20) minutes meets the test requirement.
The test method comprises the following steps of carrying out 4 groups of tests on OCr17Ni12Mo2 material parts, wherein each group of parts comprises 10 parts, and the test scheme comprises the following steps of sequentially dividing the parts into 4 groups according to different time lengths, wherein the time from a first group to a fourth group is as follows: after 7 minutes, 8 minutes, 15 minutes and 20 minutes, pickling and passivating for 7 minutes, 8 minutes, 15 minutes and 20 minutes, taking out from the solution, cleaning, and then cleaning to obtain a smooth part surface, wherein a passivation film is silvery white, and then carrying out a titration test. And carrying out corrosion resistance test, wherein after the test, the surfaces of 2-4 parts in the first group of parts are locally rusted, and the surfaces of other three groups of test pieces are unchanged.
The tests show that after the stainless steel part is subjected to pretreatment, the pickling passivation solution provided by the invention is used for pickling passivation, the pickling passivation effect of the surface of the stainless steel part after 8-20 minutes meets the national standard detection requirement, the surface of the part is smooth and clean, the film layer is complete, and the corrosion resistance is good. The invention can obviously improve the surface glossiness of the stainless steel part after acid cleaning and passivation and the corrosion resistance of the passivation film. The pickling and passivating solution prepared by the invention does not cause great harm to the environment and personnel, and the pickling and passivating processes are carried out together.
According to the method determined by tests, 10L of pickling passivation solution is prepared again, 200 parts of 1Cr18Ni9Ti sleeve parts, 135 parts of Cr13 parts and 80 parts of OCr17Ni12Mo2 parts are degreased, then pickling passivation treatment is carried out by using the pickling passivation solution prepared by the tests, 60 parts of three different stainless steel parts are taken out and divided into 3 groups for pickling passivation, the time is 10 minutes, 13 minutes and 15 minutes respectively, 20 parts of each group are taken out in a passivation mode, after cleaning and drying, 10 parts of each group after pickling passivation are taken out for carrying out titration test, after the test, the surface of each group of material parts is found to have no patina, and the test is judged to be qualified; and carrying out corrosion resistance tests on the remaining 10 parts in each group, wherein after the corrosion resistance tests are carried out, the surfaces of the parts of each group of materials are not rusted. Judging that the test is qualified; the qualification rate of the appearance effect of the parts after pickling and passivation of the products is 100 percent, and the aim of pickling and passivation of the stainless steel parts is fulfilled.
The remaining 3 stainless steel parts were all acid-pickled for passivation. The time is 13 minutes, after pickling and passivation, the parts are washed clean by clear water and dried, the surfaces of the parts are silver white films, the inspection is qualified, and each group of parts are respectively and independently packaged.
The pickling passivation solution provided by the invention can be used for pickling and passivating 304, 216, 202 or 204 types of stainless steel, the pickling and passivation functions are combined into one and do not need to be separately carried out, and a beautiful silvery white passivation film is generated on the surface after treatment, so that the passivation is compact and attractive, and is uniformly favored by customers.
The above examples are merely illustrative of the present invention and should not be construed as limiting the scope of the present invention, and all designs identical or similar to the present invention are within the scope of the present invention. The reagents and process steps not described in detail in the present invention are prior art and will not be further described in the present invention.
Claims (10)
1. A synchronous pickling passivation method for stainless steel parts is characterized by comprising the following steps: sequentially carrying out the following steps of 1, preliminarily removing oil from the stainless steel part;
step 2, further removing oil by adopting electrochemistry;
step 3, carrying out hot water washing at the temperature of 60-80 ℃ for 0.5-1 min;
step 4, cleaning, namely cleaning for many times by using running tap water;
step 5, adopting an acid pickling passivation solution to carry out acid pickling and passivation at room temperature;
step 6, cleaning, namely cleaning for many times by using running tap water;
step 7, drying, namely drying after blow-drying;
and 8, packaging, namely packaging the treated stainless steel parts by using packaging paper.
2. The synchronous pickling passivation method for the stainless steel part as claimed in claim 1, characterized in that: in the step 5, the pickling passivation solution is composed of the following components in mass concentration: 20-30 g/L of nitric acid, 2-5 g/L of butynediol, 3-5 g/L, R g/L of hydroxy ethylidene diphosphonic acid-5-8 g/L of fog inhibitor and 3-5 g/L of hydrogen peroxide.
3. The synchronous pickling passivation method for the stainless steel part as claimed in claim 1, characterized in that: in the step 5, the pickling passivation solution is pickled and passivated for 8-20 minutes at room temperature.
4. The synchronous pickling passivation method for the stainless steel part as claimed in claim 1, characterized in that: in the step 1, 180 # gasoline is adopted to soak, clean and scrub oil stains on the surface of the stainless steel part or ultrasonic equipment is used for removing oil from the stainless steel part.
5. The synchronous pickling passivation method for the stainless steel parts as claimed in claim 2, characterized in that: in the step 1, the temperature of bath solution adopted by electrochemical oil removal is 60-80 ℃, the current density is 2-5A/dm 2, and the time is 5-10 min.
6. The synchronous pickling passivation method for the stainless steel parts as claimed in claim 5, characterized in that: the bath solution adopted by the electrochemical oil removal comprises 60-80 g/L of sodium hydroxide, 20-40 g/L of sodium carbonate, 50-70 g/L of trisodium phosphate and 10-15 g/L of sodium silicate.
7. The synchronous pickling passivation method for the stainless steel part as claimed in claim 1, characterized in that: in the step 4, the stainless steel is treated in the step 3, and under the condition of thick scale, scale loosening is required, wherein the bath solution for loosening the scale comprises the following components: 500-700 g/L of sodium hydroxide, 200-250 g/L of sodium nitrate, and the temperature of the bath solution is 135-145 ℃ for 10-30 min; after the completion, the plate was washed with running tap water for several times and then subjected to acid washing in the subsequent step 5.
8. The synchronous pickling passivation method for the stainless steel part as claimed in claim 1, characterized in that: the cleaning is performed for 2-3 times by using flowing tap water.
9. The synchronous pickling passivation method for the stainless steel part as claimed in claim 1, characterized in that: the blow-drying in the step 7 is low-pressure air blow-drying; the drying is carried out at the temperature of 50-60 ℃ for 20-30 min.
10. The synchronous pickling passivation method for the stainless steel part as claimed in claim 1, characterized in that: in the step 5, the pickling passivation solution is composed of the following components in mass concentration: 25g/L of nitric acid, 3g/L of butynediol, 4g/L, R g of hydroxyethylidene diphosphonic acid-7 g/L of fog inhibitor and 4g/L of hydrogen peroxide.
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| US20070034606A1 (en) * | 2003-09-30 | 2007-02-15 | Basf Aktiengesellschaft Patents, Trademarks And Licenses | Method for pickling metallic surfaces by using alkoxylated alkynols |
| 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 |
| 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 |
| CN102653868A (en) * | 2012-03-14 | 2012-09-05 | 王福平 | Novel stainless steel acid-washing passivation liquid |
| CN102605381A (en) * | 2012-03-31 | 2012-07-25 | 大连理工大学 | Washing passivation solution of surface iron pollution of austenitic stainless steel and preparation method thereof |
| KR101931079B1 (en) * | 2017-08-23 | 2018-12-21 | 주식회사 영광와이케이엠씨 | Passivation Method of Stainless steel for Improving Corrosion Resistance |
| CN109735850A (en) * | 2018-12-28 | 2019-05-10 | 南京馥安投资管理有限公司 | A kind of method of pickling iron and steel and water circulation use |
| CN109695032A (en) * | 2019-01-10 | 2019-04-30 | 温州疆昊汽车部件有限公司 | A kind of pump nozzle and its anticorrosion treatment technology |
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