CN101050540A - Chemical process for removing oxidizing layer of stainless steel - Google Patents
Chemical process for removing oxidizing layer of stainless steel Download PDFInfo
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- CN101050540A CN101050540A CN 200710061893 CN200710061893A CN101050540A CN 101050540 A CN101050540 A CN 101050540A CN 200710061893 CN200710061893 CN 200710061893 CN 200710061893 A CN200710061893 A CN 200710061893A CN 101050540 A CN101050540 A CN 101050540A
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- stainless steel
- acid
- pickle solution
- sodium
- washing
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Abstract
This invention discloses a chemical method for removing stainless steel oxide layer. The method comprises: soaking 2205 bi-phase stainless steel belt in an acid-washing pool filled with acid-washing solution. The acid-washing solution comprises: sulfuric acid 230-260 g/L, sodium sulfite 60-100 g/L, sodium chloride 40-60 g/L, sodium nitrate 15-30 g/L, sodium borofluoride 50-80 g/L, thiourea 4-8 g/L, oxalic acid 60-100 g/L, and water as balance. The temperature of the acid-washing solution is 50-70 deg.C. The soaking time of 2205 bi-phase stainless steel belt in the acid-washing pool is 40-60 min. The acid-washing solution is stirrer by aeration during the acid washing process. The method is especially suitable for acid-washing 2205 bi-phase stainless steel belt.
Description
Technical field
The present invention relates to a kind of chemistry removal method of oxidizing layer of stainless steel.
Background technology
Hot rolling attitude 2205 duplex stainless steel zone of oxidation are carried out cleanup acid treatment, the pickle solution temperature height that existing oxidizing layer of stainless steel acid washing method uses, power consumption is big, and the treatment time is long, the cost height.Particularly in the 2205 phase stainless steels, the large-area material of slab, if carry out the zone of oxidation that pickling hot rolling attitude produces, also do not have a kind of effective means.Chinese patent once disclosed the acid washing method of some oxidizing layer of stainless steel, but not at the acid washing method as the zone of oxidation with special complex construction that produces in the 2205 duplex stainless steel hot rolling processes.Be rich in compositions such as chromium, nickel, molybdenum, silicon in the zone of oxidation that generates in this steel grade course of hot rolling, and has very complicated structure, make very acid corrosion-resistant of this zone of oxidation, general acid-washing stainless steel method be difficult to remove, and these methods are unsuitable for the pickling in the large-scale production process.
Summary of the invention
In order to overcome the above-mentioned deficiency of existing oxidizing layer of stainless steel acid washing method, the invention provides a kind of acid washing method that is applicable to 2205 phase oxidizing layer of stainless steel, present method can effectively be removed the zone of oxidation of 2205 duplex stainless steels.
2205 two-phase stainless steel bands are immersed the pickling tub with pickle solution, and pickle solution is the key that the chemistry of hot-rolled stainless steel zone of oxidation is removed, and the invention is characterized in the improvement to pickle solution, and the concentration of each material is in the pickle solution of the present invention:
Sulfuric acid 230g-260g/L
S-WAT 60g-100g/L
Sodium-chlor 40g-60g/L
SODIUMNITRATE 15g-30g/L
Sodium tetrafluoroborate 50g-80g/L
Thiocarbamide 4g-8g/L
Oxalic acid 60g-100g/L
Water surplus.
50 ℃-70 ℃ of temperature
Time 40min-60min.
The optimum concn of each material is in the pickle solution of the present invention:
Sulfuric acid 245g/L
S-WAT 80g/L
Sodium-chlor 50g/L
SODIUMNITRATE 22g/L
Sodium tetrafluoroborate 65g/L
Thiocarbamide 6g/L
Oxalic acid 80g/L
Water surplus.
Pickle solution stirs by blow (pickle solution heating and insulation are to realize by the water vapour that is blown into) in acid cleaning process always.
This acid washing method and existing other kind acid-washing stainless steel method are basic identical on step, equipment, different only at the prescription of pickle solution.Pickle solution of the present invention is in the acidic solution based on sulfuric acid, composite additive S-WAT, sodium-chlor, SODIUMNITRATE, Sodium tetrafluoroborate, oxalic acid and thiocarbamide have been added, make pickle solution have inhibition, infiltration, complexing and press down the mist function, be specially adapted to clean tight zone of oxidation through the 2205 duplex stainless steel plate surfaces generation of hot-roll forming, technology does further to adjust (otherwise overpickling can occur), also is applicable to some other stainless steel.Pickle solution of the present invention can destroy 2205 hot rolling attitude duplex stainless steels surface gasification layer particulate and intermolecular reactive force effectively, makes zone of oxidation loose and peel off.The corrosion inhibitive function that this pickle solution had can prevent that stainless steel from producing the consumption of hydrogen embrittlement and minimizing pickle solution; The infiltration function that is had can quicken rust cleaning speed; The complexing function that is had can be eliminated the deposition of a part of ion and foreign ion, can prolong the work-ing life of pickle solution and reduces cost; Press down the mist function and can reduce overflowing of acid mist, improve working conditions, do not produce excessive erosion, reduce environmental pollution.This pickle solution is particularly suitable for the acid cleaning process in the 2205 duplex stainless steel steel plate production processes.
Embodiment
Describe the embodiment of the chemistry removal method of this oxidizing layer of stainless steel in detail below in conjunction with embodiment, but the embodiment of the chemistry removal method of this oxidizing layer of stainless steel is not limited to following embodiment.
Embodiment one
Present embodiment is the pickling to 2205 phase oxidizing layer of stainless steel.
2205 phase Stainless Steel Bands are immersed the pickling tub with pickle solution, and the concentration of each material is in the pickle solution:
Sulfuric acid 245g/L
S-WAT 80g/L
Sodium-chlor 50g/L
SODIUMNITRATE 22g/L
Sodium tetrafluoroborate 65g/L
Thiocarbamide 6g/L
Oxalic acid 80g/L
Water surplus.
The temperature of pickle solution is 65 ℃, and 2205 two-phase stainless steel bands soak 45min in pickling tub.
Embodiment two
Present embodiment is the pickling to 2205 duplex stainless steel zone of oxidation.
2205 two-phase stainless steel bands are immersed the pickling tub with pickle solution, and the concentration of each material is in the pickle solution:
Sulfuric acid 260g/L
S-WAT 100g/L
Sodium-chlor 60g/L
SODIUMNITRATE 30g/L
Sodium tetrafluoroborate 80g/L
Thiocarbamide 8g/L
Oxalic acid 100g/L
Water surplus.
The temperature of pickle solution is 70 ℃, and 2205 two-phase stainless steel bands soak 48min in pickling tub.
Embodiment three
Present embodiment is the pickling to 2205 duplex stainless steel zone of oxidation.
2205 two-phase stainless steel bands are immersed the pickling tub with pickle solution, and the concentration of each material is in the pickle solution:
Sulfuric acid 230g/L
S-WAT 60g/L
Sodium-chlor 40g/L
SODIUMNITRATE 15g/L
Sodium tetrafluoroborate 50g/L
Thiocarbamide 4g/L
Oxalic acid 60g/L
Water surplus.
The temperature of pickle solution is 50 ℃, and 2205 two-phase stainless steel bands soak 60min in pickling tub.
Embodiment four
Present embodiment is the pickling to 2205 duplex stainless steel zone of oxidation.
2205 two-phase stainless steel bands are immersed the pickling tub with pickle solution, and the concentration of each material is in the pickle solution:
Sulfuric acid 260g/L
S-WAT 100g/L
Sodium-chlor 60g/L
SODIUMNITRATE 30g/L
Sodium tetrafluoroborate 50g/L
Thiocarbamide 4g/L
Oxalic acid 60g/L
Water surplus.
The temperature of pickle solution is 60 ℃, and 2205 two-phase stainless steel bands soak 55min in pickling tub.
Embodiment five
Present embodiment is the pickling to 2205 duplex stainless steel zone of oxidation.
2205 two-phase stainless steel bands are immersed the pickling tub with pickle solution, and the concentration of each material is in the pickle solution:
Sulfuric acid 230g/L
S-WAT 60gg/L
Sodium-chlor 40gg/L
SODIUMNITRATE 15gg/L
Sodium tetrafluoroborate 80g/L
Thiocarbamide 8g/L
Oxalic acid 100g/L
Water surplus.
The temperature of pickle solution is 65 ℃, and 2205 two-phase stainless steel bands soak 52min in pickling tub.
The long 10m of pickling tub, 2205 duplex stainless steel plate gauge lattice maximums of each pickling can reach 2m * 8m, and quantity is decided by the quantity and the actual production demand of pickling tub, pickling frame.
Above-mentioned five embodiment stir by blowing in acid cleaning process always.
Claims (2)
1, a kind of chemistry removal method of oxidizing layer of stainless steel immerses the pickling tub with pickle solution with 2205 two-phase stainless steel bands, it is characterized in that the concentration of each material in the pickle solution is:
Sulfuric acid 230g-260g/L
S-WAT 60g-100g/L
Sodium-chlor 40g-60g/L
SODIUMNITRATE 15g-30g/L
Sodium tetrafluoroborate 50g-80g/L
Thiocarbamide 4g-8g/L
Oxalic acid 60g-100g/L
Water surplus.
The temperature of pickle solution is 50 ℃-70 ℃, and 2205 two-phase stainless steel bands soak time in pickling tub is 40min-60min, comes stirring and pickling liquid by air blowing in acid cleaning process always.
2, the chemistry removal method of oxidizing layer of stainless steel according to claim 1 is characterized in that the concentration of each material in the said pickle solution is:
Sulfuric acid 245g/L
S-WAT 80g/L
Sodium-chlor 50g/L
SODIUMNITRATE 22g/L
Sodium tetrafluoroborate 65g/L
Thiocarbamide 6g/L
Oxalic acid 80g/L
Water surplus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100618930A CN100494504C (en) | 2007-05-16 | 2007-05-16 | Chemical process for removing oxidizing layer of stainless steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100618930A CN100494504C (en) | 2007-05-16 | 2007-05-16 | Chemical process for removing oxidizing layer of stainless steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101050540A true CN101050540A (en) | 2007-10-10 |
| CN100494504C CN100494504C (en) | 2009-06-03 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2007100618930A Expired - Fee Related CN100494504C (en) | 2007-05-16 | 2007-05-16 | Chemical process for removing oxidizing layer of stainless steel |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102134723A (en) * | 2011-01-24 | 2011-07-27 | 朱建清 | Neutral oil removing and rust removing agent |
| CN102653868A (en) * | 2012-03-14 | 2012-09-05 | 王福平 | Novel stainless steel acid-washing passivation liquid |
| CN103160844A (en) * | 2011-12-15 | 2013-06-19 | 三菱综合材料株式会社 | Method of removing oxide film on surface of copper or copper-base alloy and copper or copper-base alloy recovered using the method |
| CN104451719A (en) * | 2014-11-14 | 2015-03-25 | 无锡信大气象传感网科技有限公司 | Metal anti-rusting cleaning agent for sensor galvanized shell |
| CN106757106A (en) * | 2016-12-16 | 2017-05-31 | 安徽宝恒新材料科技有限公司 | A kind of minimizing technology of colored stainless steel electrolytic coloring after stain film |
| CN111077005A (en) * | 2020-01-03 | 2020-04-28 | 昆明理工大学 | Method for displaying thermal deformation recrystallization grain boundary of duplex stainless steel |
| CN113042340A (en) * | 2021-01-29 | 2021-06-29 | 宁波东洲传动件有限公司 | Surface treatment process for high-load injection molding rod end oscillating bearing |
| CN113865955A (en) * | 2021-08-27 | 2021-12-31 | 唐山钢铁集团有限责任公司 | Method for detecting chemical components of quenching plate |
-
2007
- 2007-05-16 CN CNB2007100618930A patent/CN100494504C/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102134723A (en) * | 2011-01-24 | 2011-07-27 | 朱建清 | Neutral oil removing and rust removing agent |
| CN103160844A (en) * | 2011-12-15 | 2013-06-19 | 三菱综合材料株式会社 | Method of removing oxide film on surface of copper or copper-base alloy and copper or copper-base alloy recovered using the method |
| CN102653868A (en) * | 2012-03-14 | 2012-09-05 | 王福平 | Novel stainless steel acid-washing passivation liquid |
| CN102653868B (en) * | 2012-03-14 | 2016-01-13 | 王福平 | Environment-friendly type acid-washing stainless steel passivating solution |
| CN104451719A (en) * | 2014-11-14 | 2015-03-25 | 无锡信大气象传感网科技有限公司 | Metal anti-rusting cleaning agent for sensor galvanized shell |
| CN106757106A (en) * | 2016-12-16 | 2017-05-31 | 安徽宝恒新材料科技有限公司 | A kind of minimizing technology of colored stainless steel electrolytic coloring after stain film |
| CN111077005A (en) * | 2020-01-03 | 2020-04-28 | 昆明理工大学 | Method for displaying thermal deformation recrystallization grain boundary of duplex stainless steel |
| CN113042340A (en) * | 2021-01-29 | 2021-06-29 | 宁波东洲传动件有限公司 | Surface treatment process for high-load injection molding rod end oscillating bearing |
| CN113865955A (en) * | 2021-08-27 | 2021-12-31 | 唐山钢铁集团有限责任公司 | Method for detecting chemical components of quenching plate |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100494504C (en) | 2009-06-03 |
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Granted publication date: 20090603 Termination date: 20160516 |