CN112553612B - Synchronous pickling and passivating method for stainless steel parts - Google Patents
Synchronous pickling and passivating method for stainless steel parts Download PDFInfo
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- CN112553612B CN112553612B CN202011612006.6A CN202011612006A CN112553612B CN 112553612 B CN112553612 B CN 112553612B CN 202011612006 A CN202011612006 A CN 202011612006A CN 112553612 B CN112553612 B CN 112553612B
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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 and passivating method for stainless steel parts, which comprises the following steps of sequentially carrying out step 1, namely, primarily degreasing the stainless steel parts; step 2, adopting electrochemistry to further remove oil; step 3, washing with hot water at 60-80 ℃ for 0.5-1 min; step 4, cleaning, namely cleaning for multiple times by using flowing tap water; step 5, pickling and passivating at room temperature by adopting pickling passivating solution; step 6, cleaning, namely cleaning for multiple times by using flowing tap water; step 7, drying, namely drying and then drying; and 8, packaging, namely packaging the treated stainless steel parts by using packaging paper. In the step 5, the pickling passivation solution consists 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 of hydroxyethylidene diphosphonic acid, 5-8 g/L of mist inhibitor and 3-5 g/L of hydrogen peroxide. The prepared pickling passivation solution does not cause great harm to the environment and personnel, and the pickling passivation process is carried out together to improve the glossiness and the corrosion resistance of the passivation film.
Description
Technical Field
The invention belongs to the technical field of surface treatment pickling passivation chemical treatment processes, and particularly relates to a synchronous pickling passivation method for stainless steel parts.
Background
Stainless steel pickling principle, that is, stainless steel and heat-resistant steel contain more nickel, chromium and other heat-resistant oxidation and corrosion-resistant metal elements, so that after high temperature treatment, a layer of compact ferric chromium oxide (FeO.Cr) containing chromium oxide, nickel oxide and very insoluble acid is formed on the surface 2 O 3 ) An oxide layer of equal composition for the effective removal of theseThe oxide must use acid solution with strong oxidizing ability to promote the conversion of low price ferrochrome oxide in the oxide layer into high price compound, and the oxide begins to loosen by the structural change of the oxide, so as to reduce the adhesive force on the surface of the substrate, thereby dissolving and stripping the oxide.
The current stainless steel part pickling passivation surface treatment process flow comprises the steps of part organic solvent degreasing, electrochemical degreasing, hot water washing, flowing water washing, loose oxide skin, flowing water washing, pickling, flowing water washing, passivation, flowing water washing, drying and packaging.
The surface and appearance of the stainless steel part treated by the method are gray, not bright, and after passivation, film integrity test is carried out, namely, a circle is drawn on the stainless steel passivation test piece near the center by using a black marker pen, 1-2 drops of the prepared drop test solution are dripped into the small circle by using a dropper, a stopwatch is started, after 5 minutes, the test solution is wiped, and whether copper is deposited at the place or not is checked. The components of the drop test solution are 8g of copper sulfate (analytically pure), 2ml of sulfuric acid (analytically pure) and distilled water are added until the copper rust exists locally at the room temperature for 3min, and the titration test is failed and needs to be repaired for many times.
Disclosure of Invention
In order to solve the problems that the existing pickling process is aged, the prepared solution causes great harm to the environment and personnel, the surface of the part is not smooth after the pickling and passivation of the stainless steel part, and the passivation film layer is discolored, the invention provides a synchronous pickling and passivation method for the stainless steel part. The method can remarkably improve the glossiness of the surface of the stainless steel part after pickling and passivation and the corrosion resistance of the passivation film.
The invention adopts the technical scheme that:
a synchronous pickling and passivating method for stainless steel parts, which sequentially comprises the following steps,
step 1, primarily degreasing stainless steel parts;
step 2, adopting electrochemistry to further remove oil;
step 3, washing with hot water at 60-80 ℃ for 0.5-1 min;
step 4, cleaning, namely cleaning for multiple times by using flowing tap water;
step 5, pickling and passivating at room temperature by adopting pickling passivating solution;
step 6, cleaning, namely cleaning for multiple times by using flowing tap water;
step 7, drying, namely drying and then drying;
and 8, packaging, namely packaging the treated stainless steel parts by using packaging paper.
In the step 5, the pickling passivation solution consists 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 of hydroxyethylidene diphosphonic acid, 5-8 g/L of mist inhibitor and 3-5 g/L of hydrogen peroxide.
In the step 5, the pickling passivation solution is subjected to pickling and passivation at room temperature for 8-20 minutes.
In the step 1, no. 180 gasoline is adopted to soak, clean and brush greasy dirt on the surface of the stainless steel part or ultrasonic equipment is used for degreasing the stainless steel part.
In the step 1, the temperature of the bath solution used for electrochemical degreasing is 60-80 ℃, the current density is 2-5A/dm < 2 >, and the time is 5-10 min.
The bath solution used for electrochemical degreasing consists of 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 required to be loosened under the condition of thick oxide skin after being treated in the step 3, and the bath solution during the loosening of the oxide skin comprises the following components: 500-700 g/L of sodium hydroxide, 200-250 g/L of sodium nitrate, and the temperature of the tank liquor is 135-145 ℃ for 10-30 min; after the completion, the washing is carried out with flowing tap water for a plurality of times, and then the subsequent pickling in the step 5 is carried out.
The cleaning is carried out by using flowing tap water for 2-3 times.
The step 7 is that the drying is low-pressure air drying; the drying is carried out at the temperature of 50-60 ℃ for 20-30 min.
In the step 5, the pickling passivation solution consists of the following components in mass concentration: 25g/L of nitric acid, 3g/L of butynediol, 4g/L, R of hydroxyethylidene diphosphonic acid, 7g/L of mist inhibitor and 4g/L of hydrogen peroxide.
The beneficial effects of the invention are as follows:
the prepared pickling passivation solution does not cause great harm to the environment and personnel, and the pickling and passivation processes are carried out together. The method can remarkably improve the glossiness of the surface of the stainless steel part after pickling and passivation and the corrosion resistance of the passivation film.
Detailed Description
Example 1:
in order to solve the problems that the existing pickling process is aged, the prepared solution causes great harm to the environment and personnel, the surface of the part is not smooth after the pickling and passivation of the stainless steel part, and the passivation film layer is discolored, the invention provides a synchronous pickling and passivation method for the stainless steel part. The method can remarkably improve the glossiness of the surface of the stainless steel part after pickling and passivation and the corrosion resistance of the passivation film.
The synchronous pickling and passivating method for the stainless steel part sequentially comprises the following steps of 1, primarily degreasing the stainless steel part;
step 2, adopting electrochemistry to further remove oil;
step 3, washing with hot water at 60-80 ℃ for 0.5-1 min;
step 4, cleaning, namely cleaning for multiple times by using flowing tap water;
step 5, pickling and passivating at room temperature by adopting pickling passivating solution;
step 6, cleaning, namely cleaning for multiple times by using flowing tap water;
step 7, drying, namely drying and then drying;
and 8, packaging, namely packaging the treated stainless steel parts by using packaging paper.
The invention ensures and meets the requirements of clean surface of the part after the stainless steel part is subjected to pickling passivation, the passivation film layer is not discolored, the film layer is complete, and the corrosion resistance is good.
Example 2:
based on the embodiment 1, in this embodiment, preferably, 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 of hydroxyethylidene diphosphonic acid, 5-8 g/L of mist inhibitor and 40% of hydrogen peroxide of 3-5 g/L.
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, no. 180 gasoline is adopted to soak, clean and brush greasy dirt on the surface of the stainless steel part or ultrasonic equipment is used for degreasing the stainless steel part.
Preferably, in the step 1, the temperature of the bath solution used for electrochemical degreasing 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 degreasing consists of 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 degreasing is carried out, the temperature, the current density and the time of bath liquid are controlled, the degreasing time is too short, and the greasy dirt on the surface of the stainless steel cannot be thoroughly removed; too long oil removal time can cause the surface of the stainless steel to be rough, and the surface smoothness of the stainless steel is affected. The operator must carefully handle the degreasing process.
Preferably, in the step 4, the stainless steel is subjected to the treatment of the step 3, and loose oxide skin is needed under the condition of thick oxide skin, and the bath solution during the loose oxide skin comprises the following components: 500-700 g/L of sodium hydroxide, 200-250 g/L of sodium nitrate, and the temperature of the tank liquor is 135-145 ℃ for 10-30 min; after the completion, the washing is carried out with flowing tap water for a plurality of times, and then the subsequent pickling in the step 5 is carried out.
Preferably, the cleaning is carried out by using flowing tap water for 2-3 times.
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 clean surface of the part after the stainless steel part is subjected to pickling passivation, the passivation film layer is not discolored, the film layer is complete, and the corrosion resistance is good. The prepared pickling passivation solution does not cause great harm to the environment and personnel, and the pickling and passivation processes are carried out together. The method can remarkably improve the glossiness of the surface of the stainless steel part after pickling 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 in mass concentration: 25g/L of nitric acid, 3g/L of butynediol, 4g/L, R of hydroxyethylidene diphosphonic acid, 7g/L of mist inhibitor and 4g/L of hydrogen peroxide.
The pickling passivation solution provided by the scheme has the advantages that the pickling passivation effect of the surface of the part after 8-20 minutes of action meets the detection requirement of the national standard, the surface of the part is smooth, 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 in mass concentration: nitric acid 20g/L, butynediol 2g/L, hydroxyethylidene diphosphonic acid 3g/L, R-antifogging agent 5g/L and hydrogen peroxide 3 g/L.
The pickling passivation solution provided by the scheme has the advantages that the pickling passivation effect of the surface of the part after 8-20 minutes of action meets the detection requirement of the national standard, the surface of the part is smooth, 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 nitric acid, 5g/L butynediol, 5g/L, R of hydroxyethylidene diphosphonic acid, 8g/L of mist inhibitor and 5g/L hydrogen peroxide.
The pickling passivation solution provided by the scheme has the advantages that the pickling passivation effect of the surface of the part after 8-20 minutes of action meets the detection requirement of the national standard, the surface of the part is smooth, the film layer is complete, and the corrosion resistance is good.
In the invention, experiments on stainless steel parts are carried out on the three pickling passivation solution schemes in examples 3-5, and the experimental processes and results are as follows:
4 sets of test parts, 24 per set, were each made with a stainless steel material 1Cr18Ni9Ti sleeve 96 parts, 8 parts for each pickling passivation solution scheme in examples 3-5.
The pickling passivation is divided into 4 groups according to different time periods in sequence, and the time from the first group to the fourth group is respectively as follows: after 5 minutes, 10 minutes, 15 minutes and 20 minutes, the parts are taken out from the solution after the pickling and passivation time is finished, the surfaces of the parts are smooth and clean, the passivation film is silvery white, 4 parts are taken out for each group of tests to carry out titration tests, the surfaces of the last 3 groups of test parts are all free from color change, and the surfaces of the first group of test parts are locally provided with copper rust.
Then, corrosion resistance test was carried out by using a salt water immersion method HB5292-84. The detection method comprises the following steps: immersing the part with the passivation film layer into 3% sodium chloride aqueous solution, keeping the part at the temperature of (15-20) ℃ for 24 hours, and taking out the part to check whether the surface of the part is corroded. And 4 parts are taken out from each of the four groups of tests for testing, the parts are taken out from the solution after pickling and passivating for 5 minutes, 10 minutes, 15 minutes and 20 minutes, the surfaces of the parts are clean and clean after cleaning, the passivating film is silvery white, and then corrosion resistance tests are carried out, and the surfaces of the 3 groups of test parts are free from color change, and 2-4 parts are respectively corroded at local parts after the 1 st group of tests.
The passivation effect of 5 minutes of pickling passivation is not ideal.
And then carrying out 2 groups of tests on each pickling passivation solution scheme in the embodiment 3-5 by 36 parts, carrying out pickling passivation treatment on 3 parts in each group, wherein the first group is pickling passivation for 6 minutes, the second group is pickling passivation for 8 minutes, taking out from the solution after the pickling passivation time is finished, cleaning the surfaces of the parts, and carrying out titration experiments on 3 parts in each group in each scheme, wherein the second group of parts in each pickling passivation solution scheme in the embodiment 3-5 has no surface patina, carrying out corrosion resistance tests on the rest parts, and carrying out corrosion resistance tests on the surfaces of 1-2 parts in the first group of parts in the three schemes (each pickling passivation solution scheme in the embodiment 3-5) after the tests. Tests prove that the passivation effect of the pickling passivation time of 8 minutes meets the test requirements.
4 groups of tests are carried out by using 2Cr13 material parts, and each group of parts comprises 10 parts according to the following test scheme: the parts are taken out from the solution after pickling and passivating for 6 minutes, 8 minutes, 15 minutes and 20 minutes, the surfaces of the parts are clean and clean, the passivating film is silvery white, and then titration tests are carried out, so that the surfaces of three groups of test pieces are unchanged except that copper rust is locally formed on the surfaces of 2-4 parts in 5 tests in the first group. And performing corrosion resistance tests, wherein the surfaces of 2-3 parts in the first group of parts are corroded locally after the tests, and the surfaces of the other three groups of test pieces are unchanged.
Experiments prove that the passivation effect of 2Cr13 material with the pickling passivation time of (8-20) minutes meets the test requirements.
4 groups of test are carried out by using OCr17Ni12Mo2 material parts, each group of parts comprises 10 parts, the test scheme is that the parts are sequentially divided into 4 groups according to different time periods, and the time from the first group to the fourth group is respectively as follows: after 7 minutes, 8 minutes, 15 minutes and 20 minutes, the parts are taken out from the solution after pickling and passivating for 7 minutes, 8 minutes, 15 minutes and 20 minutes, the surfaces of the parts are clean and clean, the passivating films are silvery white, and then titration tests are carried out, so that the surfaces of the three groups of test pieces are unchanged except that the surfaces of 2-3 parts in 5 of the first group of tests have local patina. And performing corrosion resistance tests, wherein the surfaces of 2-4 parts in the first group of parts are corroded locally after the tests, and the surfaces of the other three groups of test pieces are unchanged.
The test shows that the pickling passivation solution provided by the invention is adopted to carry out pickling passivation on the stainless steel part after pretreatment, the pickling passivation effect of the surface of the part after (8-20) minutes of the stainless steel part meets the national standard detection requirement, the surface of the part is smooth, the film layer is complete, and the corrosion resistance is good. The invention can obviously improve the glossiness of the surface of the stainless steel part after pickling and passivation and the corrosion resistance of the passivation film. The prepared pickling passivation solution does not cause great harm to the environment and personnel, and the pickling and passivation processes are carried out together.
According to the method determined by the test, 10L of pickling passivation solution is prepared again, after 200 1Cr18Ni9Ti sleeve parts, 135 Cr13 parts and 80 OCr17Ni12Mo2 parts are degreased, the pickling passivation solution prepared by the test is used for pickling passivation treatment, 60 parts are firstly taken out of three different stainless steel parts and are divided into 3 groups, pickling passivation is carried out for 10 minutes, 13 minutes and 15 minutes respectively, 20 parts of each group are taken out for passivation, after cleaning and drying, 10 parts are taken out from each group of parts after pickling passivation for titration test, and after the test, no copper rust appears on the surfaces of the parts of each group of materials, and the test is judged to be qualified; the rest 10 parts in each group are subjected to corrosion resistance test, and after the test, the surfaces of the parts in each group are free from rust corrosion. Judging that the test is qualified; the qualification rate of the appearance effect of the product after pickling and passivation is 100%, and the aim of pickling and passivation of stainless steel parts is achieved.
The remaining 3 stainless steel parts were all acid passivated. The time is 13 minutes, after pickling and passivation, the parts are washed clean by clean water, dried, the surfaces of the parts are silvery white films, inspected to be qualified, and each group of parts is respectively and independently packaged.
The pickling passivation solution provided by the invention can carry out pickling passivation treatment on stainless steel of model 304, 216, 202 or 204, the pickling and passivation functions are integrated into a whole, no separation is needed, and a beautiful silvery white passivation film is produced on the treated surface, so that the passivation is compact and attractive, and is well-appreciated by customers.
The above examples are merely illustrative of the present invention and are not meant to limit the scope of the present invention, and all designs that are the same or similar to the present invention are within the scope of the present invention. Reagents and method steps not described in detail in the present invention are all prior art, and will not be further described in the present invention.
Claims (6)
1. A synchronous pickling and passivating method for stainless steel parts is characterized by comprising the following steps: the following steps are carried out in sequence,
step 1, primarily degreasing stainless steel parts;
step 2, adopting electrochemistry to further remove oil; the bath solution used for electrochemical degreasing consists of 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;
step 3, washing with hot water at 60-80 ℃ for 0.5-1 min;
step 4, cleaning, namely cleaning for multiple times by using flowing tap water; in the step 4, the stainless steel is required to be loosened under the condition of thick oxide skin after being treated in the step 3, and the bath solution during the loosening of the oxide skin comprises the following components: 500-700 g/L of sodium hydroxide, 200-250 g/L of sodium nitrate, and the temperature of the tank liquor is 135-145 ℃ for 10-30 min; washing the steel plate with flowing tap water for multiple times after the steel plate is finished, and then carrying out subsequent acid washing in the step 5;
step 5, pickling and passivating at room temperature by adopting pickling passivating solution; in the step 5, the pickling passivation solution consists 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 of hydroxyethylidene diphosphonic acid, 5-8 g/L of mist inhibitor and 3-5 g/L of hydrogen peroxide; in the step 5, pickling and passivating the pickling and passivating solution at room temperature for 8-20 minutes;
step 6, cleaning, namely cleaning for multiple times by using flowing tap water;
step 7, drying, namely drying and then drying;
and 8, packaging, namely packaging the treated stainless steel parts by using packaging paper.
2. The method for synchronously pickling and passivating the stainless steel part according to claim 1, which is characterized by comprising the following steps: in the step 1, no. 180 gasoline is adopted to soak, clean and brush greasy dirt on the surface of the stainless steel part or ultrasonic equipment is used for degreasing the stainless steel part.
3. The method for synchronously pickling and passivating the stainless steel part according to claim 1, which is characterized by comprising the following steps: in the step 2, the temperature of the bath solution used for electrochemical degreasing is 60-80 ℃, the current density is 2-5A/dm < 2 >, and the time is 5-10 min.
4. The method for synchronously pickling and passivating the stainless steel part according to claim 1, which is characterized by comprising the following steps: the cleaning is carried out by using flowing tap water for 2-3 times.
5. The method for synchronously pickling and passivating the stainless steel part according to claim 1, which is characterized by comprising the following steps: the step 7 is that the drying is low-pressure air drying; the drying is carried out at the temperature of 50-60 ℃ for 20-30 min.
6. The method for synchronously pickling and passivating the stainless steel part according to claim 1, which is characterized by comprising the following steps: in the step 5, the pickling passivation solution consists of the following components in mass concentration: 25g/L of nitric acid, 3g/L of butynediol, 4g/L, R of hydroxyethylidene diphosphonic acid, 7g/L of mist inhibitor and 4g/L of hydrogen peroxide.
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| 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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