CN101343739A - Acid washing passivation technology for stainless steel - Google Patents
Acid washing passivation technology for stainless steel Download PDFInfo
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- CN101343739A CN101343739A CNA200810032200XA CN200810032200A CN101343739A CN 101343739 A CN101343739 A CN 101343739A CN A200810032200X A CNA200810032200X A CN A200810032200XA CN 200810032200 A CN200810032200 A CN 200810032200A CN 101343739 A CN101343739 A CN 101343739A
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Abstract
Disclosed is a stainless steel pickling and passivating process. The stainless steel pickling and passivating process comprises the following steps: firstly, alkali degreasing: a stainless steel workpiece is soaked in an alkali solution with the temperature of 60 to 80 DEG C for 15 to 20 minutes; secondly, the first water washing: the workpiece is soaked in water of the normal temperature for 2 to 3 minutes and flushed with water; thirdly, white corundum or glass bead is evenly sprayed on the surface of the workpiece; fourthly, the second water washing: the step is same with the second step; fifthly, passivating: the workpiece is soaked in a solution of nitric acid and sodium bichromate at the normal temperature for 30 to 60 minutes to make the surface of the workpiece form a protection layer; sixthly, the third water washing: the step is same with the second step; seventhly, drying: the workpiece is dried in a clean drying oven at the temperature of 80 to 100 DEG C for 30 to 60 minutes; and eighthly, coating protection: a transparent protection layer is sprayed and dried, and the coating thickness is 15 micrometers with the tolerance of 5 micrometers. The invention can guarantee the surface decoration of the stainless steel workpiece, enhance the corrosion resistance of the stainless steel effectively, and improve the performance of finger-mark pollution on the stainless steel surface; the operation is simple, the pollution to the environment is less, the working condition is good; and the energy consumption is low.
Description
Technical field
The present invention relates to a kind of surface treatment technique for stainless steel, especially relate to a kind of stainless steel work-piece surface acid-washing passivation technology.
Background technology
Stainless steel product is through mechanical workout, after the operations such as welding, the surface can produce a large amount of cuts, sleek, and parts of stainless steel is being shaped, assembling, welding, can bring greasy dirt in the processes such as welding inspection and construction mark, iron rust, nonmetal foul, paint, welding slag and splash etc., and the polishing dust or the disparate metals particle of a large amount of other metallic elements of surface adhesion, these materials all can influence the parts of stainless steel surface quality, reduce stainless corrosion resistance and (comprise spot corrosion, crevice corrosion), even can cause stress corrosion cracking, surface quality of workpieces is poor.Therefore, generally to adopt acid wash passivation, remove the adherent various foreign matters of stainless steel surface simultaneously, reach and improve the corrosion-resistant and ornamental purpose of stainless steel to remove the cut and the sleek of stainless steel surface.
At present, Chang Yong stainless steel surface processing mode mainly contains: three acid (sulfuric acid+nitric acid+hydrochloric acid) pickling, nitric acid+hydrofluoric acid pickling, soda boiling-pickling composite algorithm etc.Three acid (sulfuric acid+nitric acid+hydrochloric acid) pickling temperature will maintain about 70～80 ℃ substantially, and the concrete pickling time will decide according to steel material oxide skin composition and situation, and three pickling can be removed the stainless steel oxidation skin smoothly.Nitric acid+hydroflouric acid washing method pickling speed is fast, easy to operate, and quality is better.Soda boiling-pickling composite algorithm can be improved pickling quality, and metal consumption is also less, and soda boiling can be become flexible oxide skin, is convenient to use the acid wash scale removal thereafter, the soda boiling temperature is controlled at 500～550 ℃, and the time of soda boiling is relevant with the steel grade of product, specification, quantity, oxide skin state etc.Should immerse quick-fried descaling in the tank immediately after the soda boiling, and then with three sour acid wash scale removals.Product should be dry anhydrous when adopting this method to handle, and hurts sb.'s feelings to avoid heat alkali liquid to spatter; The product of a soda boiling is too much unsuitable, generally is not more than 1/6 of alkali lye, and product is too much, and alkali liquid temperature is descended too much, influences the soda boiling effect; Product after the soda boiling should get wet immediately, falls oxide skin with quick-fried.
Though more than these methods have certain effect, all come with some shortcomings, can not satisfy the requirement that quality product, production unit and environment protection are improved day by day.
Existing three sour acid wash only can be removed the thin oxide skin of stainless steel surface, simultaneously, nitrogen peroxide (NO are arranged in the acid cleaning process
2) separate out in a large number, worsening labor condition, contaminate environment also easily produces the overpickling phenomenon.In nitric acid+hydrofluoric acid pickling method, hydrofluoric acid toxicity is big, needs good ventilation condition and wastewater treatment condition; In addition, remove the cut of workpiece surface, the ability and the anti-finger of the workpiece surface line poor-performing of sleek.Soda boiling---in the pickling composite algorithm, alkali lye needs heating, and energy consumption is higher, and has problem of environmental pollution in acid cleaning process.
Summary of the invention
The object of the present invention is to provide a kind of removal workpiece surface cut, sleek effective, less to the pollution of environment, the acid washing passivation technology for stainless steel that energy consumption is lower.
Further aim of the present invention is to provide a kind of and not only removes the workpiece surface cut, sleek is effective, and less to the pollution of environment, energy consumption is lower, and the good acid washing passivation technology for stainless steel of the anti-fingerprint performance of workpiece after handling.
The objective of the invention is to be achieved through the following technical solutions, it may further comprise the steps: (1) alkali degreasing, stainless steel work-piece is immersed in 60～80 ℃ the alkali degreasing solution 15～20 minutes, removes the polishing dust of greasy dirt, dust, other metallic elements of workpiece surface or disparate metals particle etc.; (2) washing was for the first time soaked 2～3 minutes with normal-temperature water, and water is rinsed well again; (3) sandblast evenly sprays diamantane or granulated glass sphere at workpiece surface, the cut of removal workpiece surface, sleek, oxide skin etc.; (4) washing for the second time, method is with (2) step; (5) passivation is immersed in normal temperature nitric acid+sodium dichromate solution 30～60 minutes with workpiece, makes workpiece surface form layer protecting film, to guarantee the erosion resistance of product; (6) washing for the third time, method is with (2) step; (7) drying is toasted 30～60 minutes, in order to avoid workpiece is contaminated in 80～100 ℃ clean baking oven.
Described alkali degreasing solution is the existing known alkaline degreasing fluid that contains 3wt%～5wt% sodium hydroxide, yellow soda ash, sodium phosphate, water glass, and there is the sale of finished goods for preparing in market.
Described nitric acid+sodium dichromate solution is for containing nitric acid 300～500g/L, the solution of sodium dichromate 99 20～30g/L.
Further aim of the present invention is achieved through the following technical solutions: after (7) step, spray aqueous transparent varnish again in aforementioned schemes with the formation protective clear layer, and dry, the thickness of coating is 15 ± 5 microns.
The present invention adopts blasting method to remove cut, the sleek on stainless steel work-piece surface, can guarantee the decorative surface of stainless steel work-piece; Adopt Passivation Treatment effectively to improve stainless solidity to corrosion; Spraying aqueous transparent varnish protective layer can solve the problem that the anti-finger of stainless steel surface line pollutes difference.
The present invention is simple to operate, does not have nitrogen peroxide (NO in the acid cleaning process
2) overflow, needn't use hydrofluoric acid, little to the pollution of environment, improved labor condition greatly, alleviated harm to operator's health; The degreasing alkali liquid temperature that uses is low, can significantly cut down the consumption of energy.
Embodiment
Embodiment 1
(1) (main solute composition is sodium hydroxide, yellow soda ash, sodium phosphate, water glass, and total concn is 4% 70 ℃ alkali degreasing solution with stainless steel work-piece; Buy from market) dipping 18 minutes, remove the polishing dust of greasy dirt, dust, other metallic elements of workpiece surface or disparate metals particle etc.; (2) soaked 2 minutes with normal-temperature water, water is rinsed well again; (3) evenly spray diamantane sand at workpiece surface, the cut of removal workpiece surface, sleek, oxide skin etc.; (4) washing for the second time, method is with (2) step; (5) workpiece was soaked 45 minutes in normal temperature nitric acid+sodium dichromate solution (containing nitric acid 400g/L, sodium dichromate 99 25g/L), make workpiece surface form layer protecting film, to guarantee the erosion resistance of product; (6) washing for the third time, method is with (2) step; (7) drying, baking is 45 minutes in 90 ℃ clean baking oven, in order to avoid workpiece is contaminated; (8) coating protection, spraying aqueous transparent varnish, drying, the thickness of coating is 15 ± 5 microns.
With the stainless steel work-piece surface that the present embodiment method is handled, good decorative property; Effectively improved stainless solidity to corrosion (by neutral salt spray test 120 hours, the surface was without any corrosion phenomenon); Efficiently solve the anti-finger of stainless steel surface line pollution problems.
Embodiment 2
(1) (main solute composition is sodium hydroxide, yellow soda ash, sodium phosphate, water glass, and total concn is 5wt% stainless steel work-piece to be immersed in 60 ℃ alkali degreasing solution; Buy from market) 20 minutes, remove the polishing dust of greasy dirt, dust, other metallic elements of workpiece surface or disparate metals particle etc.; (2) washing was for the first time soaked 3 minutes with normal-temperature water, and water is rinsed well again; (3) evenly spray granulated glass sphere at workpiece surface, the cut of removal workpiece surface, sleek, oxide skin etc.; (4) washing for the second time, method is with (2) step; (5) workpiece was soaked 60 minutes in normal temperature nitric acid+sodium dichromate solution (containing nitric acid 300g/L, sodium dichromate 99 30g/L), make workpiece surface form layer protecting film; (6) washing for the third time, method is with (2) step; (7) drying, baking is 30 minutes in 100 ℃ clean baking oven; (8) coating protection, the transparent varnish of spraying water-based, and dry, the thickness of coating is 15 ± 5 microns.
With the stainless steel work-piece surface that the present embodiment method is handled, good decorative property; Effectively improved stainless solidity to corrosion (by neutral salt spray test 120 hours, the surface was without any corrosion phenomenon); Efficiently solve the anti-finger of stainless steel surface line pollution problems.
Embodiment 3
(1) (main component is sodium hydroxide, yellow soda ash, sodium phosphate, water glass, and total concn is 3% 80 ℃ alkali degreasing solution with stainless steel work-piece; Buy from market) dipping 15 minutes, remove the polishing dust of greasy dirt, dust, other metallic elements of workpiece surface or disparate metals particle etc.; (2) washing was for the first time soaked 3 minutes with normal-temperature water, and water is rinsed well again; (3) sandblast evenly sprays diamantane at workpiece surface, the cut of removal workpiece surface, sleek, oxide skin etc.; (4) washing for the second time, method is with (2) step; (5) passivation is soaked workpiece 30 minutes in normal temperature nitric acid+sodium dichromate solution (containing nitric acid 500g/L, sodium dichromate 99 20g/L); (6) washing for the third time, method is with (2) step; (7) in 80 ℃ clean baking oven, toasted 60 minutes.
With the stainless steel work-piece surface that the present embodiment method is handled, good decorative property; Effectively improved stainless solidity to corrosion (by neutral salt spray test 120 hours, the surface was without any corrosion phenomenon).
Claims (2)
1, a kind of acid washing passivation technology for stainless steel is characterized in that, may further comprise the steps: (1) alkali degreasing, flooded stainless steel work-piece 15～20 minutes in 60～80 ℃ alkali degreasing solution; (2) washing was for the first time soaked 2～3 minutes with normal-temperature water, and water is rinsed well again; (3) sandblast evenly sprays diamantane or granulated glass sphere at workpiece surface; (4) washing for the second time, method is with (2) step; (5) passivation was soaked workpiece 30～60 minutes in normal temperature nitric acid+sodium dichromate solution, make workpiece surface form layer protecting film; (6) washing for the third time, method is with (2) step; (7) drying was toasted 30～60 minutes in 80～100 ℃ clean baking oven;
Described alkali degreasing solution is the alkali degreasing solution that contains 3wt%～5wt% sodium hydroxide, yellow soda ash, sodium phosphate, water glass;
Described nitric acid+sodium dichromate solution is for containing nitric acid 300～500g/L, the solution of sodium dichromate 99 20～30g/L.
2, acid washing passivation technology for stainless steel according to claim 1 is characterized in that, after described (7) step, sprays aqueous transparent varnish again, and dry, and the thickness of coating is 15 ± 5 microns.
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Cited By (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN102839364A (en) * | 2012-09-11 | 2012-12-26 | 上海神洲阳光特种钢管有限公司 | Surface processing technology of food-grade stainless steel pipe |
| CN103320778A (en) * | 2012-03-20 | 2013-09-25 | 春兴铸造(苏州工业园区)有限公司 | Aviation pipe stainless steel passivation technology |
| CN103422107A (en) * | 2013-08-23 | 2013-12-04 | 苏州长盛机电有限公司 | Method for processing rusty chains |
| CN103924054A (en) * | 2014-04-30 | 2014-07-16 | 重庆钢铁(集团)有限责任公司 | Antirust method for 20A steel tube for aviation |
| CN105441919A (en) * | 2015-12-11 | 2016-03-30 | 中国航空工业标准件制造有限责任公司 | Passivator and passivation method of partially nitrided 1Cr11Ni2W2MoV material product |
| CN106148936A (en) * | 2015-03-25 | 2016-11-23 | 株洲时代新材料科技股份有限公司 | A kind of stainless steel material improving antiseptic property processes technique |
| CN106500379A (en) * | 2016-11-09 | 2017-03-15 | 安徽启东热能科技有限公司 | A kind of resistant antiseptical refrigerating plant |
| CN106521474A (en) * | 2016-10-14 | 2017-03-22 | 江苏森威精锻有限公司 | Surface passivation treatment method of hollow shaft |
| CN106567774A (en) * | 2016-11-09 | 2017-04-19 | 安徽启东热能科技有限公司 | Efficient power system for ships |
| CN106637170A (en) * | 2015-10-30 | 2017-05-10 | 东莞新科技术研究开发有限公司 | Stainless steel passivation technology |
| CN106756975A (en) * | 2016-11-25 | 2017-05-31 | 泸州北方化学工业有限公司 | A kind of surface treatment technique for stainless steel |
| CN106752648A (en) * | 2016-12-26 | 2017-05-31 | 安徽宝恒新材料科技有限公司 | A kind of preparation method of high-hardness fingerprint-resistant stainless steel |
| CN107267975A (en) * | 2017-05-19 | 2017-10-20 | 江苏金基特钢有限公司 | A kind of method for improving common iron rustless property |
| CN107523823A (en) * | 2016-06-22 | 2017-12-29 | 株洲中车时代电气股份有限公司 | A kind of passivating method of parts of stainless steel |
| CN108977818A (en) * | 2018-08-02 | 2018-12-11 | 成都格瑞特高压容器有限责任公司 | Stainless steel gas cylinder forms plication region acid washing method |
| CN110523956A (en) * | 2019-09-04 | 2019-12-03 | 马鞍山海华耐磨材料科技有限公司 | A kind of preparation process of the anticorrosive liner plate of high-strength abrasion-proof |
| CN110592566A (en) * | 2019-09-03 | 2019-12-20 | 厦门建霖健康家居股份有限公司 | Stainless steel passivator and passivation process thereof |
| CN110629208A (en) * | 2019-10-14 | 2019-12-31 | 江苏华海钢结构有限公司 | Surface treatment process for acid-resistant steel workpiece |
| CN110760834A (en) * | 2019-12-04 | 2020-02-07 | 嘉善永金金属制品有限公司 | Metal part surface treatment process |
| CN111036047A (en) * | 2019-12-31 | 2020-04-21 | 深圳粤鹏环保技术股份有限公司 | Method for improving plasma electric field processing efficiency |
| CN112501668A (en) * | 2020-08-04 | 2021-03-16 | 上海船舶工艺研究所(中国船舶工业集团公司第十一研究所) | Surface treatment method for stainless steel with high adhesion with coating |
| CN112713026A (en) * | 2020-12-14 | 2021-04-27 | 河南平高电气股份有限公司 | Method for treating foreign matters on surfaces of parts in arc extinguishing chamber of circuit breaker |
| CN115369396A (en) * | 2022-08-30 | 2022-11-22 | 株洲时代金属制造有限公司 | Surface treatment method for rail transit stainless steel electrical cabinet |
-
2008
- 2008-09-01 CN CNB200810032200XA patent/CN100560798C/en active Active
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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 |
| CN103320778A (en) * | 2012-03-20 | 2013-09-25 | 春兴铸造(苏州工业园区)有限公司 | Aviation pipe stainless steel passivation technology |
| CN103320778B (en) * | 2012-03-20 | 2015-09-23 | 春兴铸造(苏州工业园区)有限公司 | A kind of aviation pipe stainless steel passivation process |
| CN102839364A (en) * | 2012-09-11 | 2012-12-26 | 上海神洲阳光特种钢管有限公司 | Surface processing technology of food-grade stainless steel pipe |
| CN102839364B (en) * | 2012-09-11 | 2014-08-13 | 上海神洲阳光特种钢管有限公司 | Surface processing technology of food-grade stainless steel pipe |
| CN103422107A (en) * | 2013-08-23 | 2013-12-04 | 苏州长盛机电有限公司 | Method for processing rusty chains |
| CN103422107B (en) * | 2013-08-23 | 2015-06-17 | 苏州长盛机电有限公司 | Method for processing rusty chains |
| CN103924054A (en) * | 2014-04-30 | 2014-07-16 | 重庆钢铁(集团)有限责任公司 | Antirust method for 20A steel tube for aviation |
| CN103924054B (en) * | 2014-04-30 | 2015-11-11 | 重庆钢铁(集团)有限责任公司 | The aviation rust-proofing method of 20A steel pipe |
| CN106148936B (en) * | 2015-03-25 | 2019-04-23 | 株洲时代新材料科技股份有限公司 | A kind of stainless steel material treatment process improving antiseptic property |
| CN106148936A (en) * | 2015-03-25 | 2016-11-23 | 株洲时代新材料科技股份有限公司 | A kind of stainless steel material improving antiseptic property processes technique |
| CN106637170A (en) * | 2015-10-30 | 2017-05-10 | 东莞新科技术研究开发有限公司 | Stainless steel passivation technology |
| CN105441919A (en) * | 2015-12-11 | 2016-03-30 | 中国航空工业标准件制造有限责任公司 | Passivator and passivation method of partially nitrided 1Cr11Ni2W2MoV material product |
| CN107523823A (en) * | 2016-06-22 | 2017-12-29 | 株洲中车时代电气股份有限公司 | A kind of passivating method of parts of stainless steel |
| CN106521474A (en) * | 2016-10-14 | 2017-03-22 | 江苏森威精锻有限公司 | Surface passivation treatment method of hollow shaft |
| CN106567774A (en) * | 2016-11-09 | 2017-04-19 | 安徽启东热能科技有限公司 | Efficient power system for ships |
| CN106500379A (en) * | 2016-11-09 | 2017-03-15 | 安徽启东热能科技有限公司 | A kind of resistant antiseptical refrigerating plant |
| CN106756975A (en) * | 2016-11-25 | 2017-05-31 | 泸州北方化学工业有限公司 | A kind of surface treatment technique for stainless steel |
| CN106752648A (en) * | 2016-12-26 | 2017-05-31 | 安徽宝恒新材料科技有限公司 | A kind of preparation method of high-hardness fingerprint-resistant stainless steel |
| CN107267975A (en) * | 2017-05-19 | 2017-10-20 | 江苏金基特钢有限公司 | A kind of method for improving common iron rustless property |
| CN108977818A (en) * | 2018-08-02 | 2018-12-11 | 成都格瑞特高压容器有限责任公司 | Stainless steel gas cylinder forms plication region acid washing method |
| CN110592566A (en) * | 2019-09-03 | 2019-12-20 | 厦门建霖健康家居股份有限公司 | Stainless steel passivator and passivation process thereof |
| CN110523956A (en) * | 2019-09-04 | 2019-12-03 | 马鞍山海华耐磨材料科技有限公司 | A kind of preparation process of the anticorrosive liner plate of high-strength abrasion-proof |
| CN110629208A (en) * | 2019-10-14 | 2019-12-31 | 江苏华海钢结构有限公司 | Surface treatment process for acid-resistant steel workpiece |
| CN110760834A (en) * | 2019-12-04 | 2020-02-07 | 嘉善永金金属制品有限公司 | Metal part surface treatment process |
| CN111036047A (en) * | 2019-12-31 | 2020-04-21 | 深圳粤鹏环保技术股份有限公司 | Method for improving plasma electric field processing efficiency |
| CN111036047B (en) * | 2019-12-31 | 2023-10-27 | 深圳粤鹏环保技术股份有限公司 | Method for improving plasma electric field treatment efficiency |
| CN112501668A (en) * | 2020-08-04 | 2021-03-16 | 上海船舶工艺研究所(中国船舶工业集团公司第十一研究所) | Surface treatment method for stainless steel with high adhesion with coating |
| CN112501668B (en) * | 2020-08-04 | 2024-04-05 | 上海船舶工艺研究所(中国船舶集团有限公司第十一研究所) | Stainless steel surface treatment method with high adhesion to coating |
| CN112713026A (en) * | 2020-12-14 | 2021-04-27 | 河南平高电气股份有限公司 | Method for treating foreign matters on surfaces of parts in arc extinguishing chamber of circuit breaker |
| CN115369396A (en) * | 2022-08-30 | 2022-11-22 | 株洲时代金属制造有限公司 | Surface treatment method for rail transit stainless steel electrical cabinet |
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Effective date of registration: 20141027 Address after: 100844 Fuxing Road, Beijing, Haidian District, No. 10 Patentee after: CHINA RAILWAY CORPORATION Patentee after: Zhuzhou CSR Times Electric Co., Ltd. Address before: 10 Fuxing Road, Beijing, No. 100844 Patentee before: Transport Bureau of Railway Department Patentee before: Zhuzhou CSR Times Electric Co., Ltd. |