CN1017728B - Chemical process of removing oxidized layer of stainless steel - Google Patents
Chemical process of removing oxidized layer of stainless steelInfo
- Publication number
- CN1017728B CN1017728B CN 90110300 CN90110300A CN1017728B CN 1017728 B CN1017728 B CN 1017728B CN 90110300 CN90110300 CN 90110300 CN 90110300 A CN90110300 A CN 90110300A CN 1017728 B CN1017728 B CN 1017728B
- Authority
- CN
- China
- Prior art keywords
- acid
- concentration
- stainless steel
- liquid
- oxidized layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- 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
- C23G1/086—Iron or steel solutions containing HF
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
- Detergent Compositions (AREA)
Abstract
The present invention relates to a method for removing an oxidized layer of stainless steel. Removing liquid is prepared from fluoborate, nitric acid, sulfuric acid, hydrochloric acid, hydrofluoric acid, perchloric acid and hydrogen peroxide, and fluoboric acid provides a certain amount of HF in hydrolysis and is capable of forming stable complexes with nitrogen oxide; therefore, the efficient removal of the oxidized layer of the nitric acid and hydrofluoric acid can be ensured, and the escape of HF and the nitrogen oxide can be presented to avoid air pollution.
Description
The present invention relates to the chemical treatment method of oxidizing layer of stainless steel.
Owing to stainless steel has preferably corrosion resistance nature, heat conductivility, mechanical property and advantage such as attractive in appearance is widely used in the economic every profession and trade of promulgated by the State Council.Stainless section bar, foundry goods or workpiece form the black gray zone of oxidation of one deck once the pyroprocessing rear surface, and the surface is smooth and beautiful appearance, not corrosion-resistant neither, are difficult for further processing again, thereby must be removed.The method that removes oxidizing layer of stainless steel (hereinafter to be referred as zone of oxidation) has chemical method and mechanical process etc., because chemical method is simple and efficient is high so extensively adopt.The most normal use is to embathe stainless steel part with hydrofluoric acid and nitric acid mixed solution, it is very rapid that ground is carried out in its zone of oxidation (containing metal oxide such as Ni, Cr, Fe and nonmetal oxide etc.) and the reaction of this mixing acid, takes off zone of oxidation soon, manifests the bright and clean metallic surface of stainless steel.Yet in acid cleaning process, can produce a large amount of oxynitride (NO, NO
2) constantly overflow serious environment pollution and threat workers'health with hydrogen fluoride.Hydrogen fluoride has extremely strong seepage force to human body, and the people has corrosion and detrimental effect to skin and respiratory organs containing to work under this atmosphere surrounding not only for a long time, and harm bone and tooth; Oxynitride also is very serious to the harm of human body
Just can jeopardize the people's during 100～150ppm
People constantly study, with different chemistry
Zone of oxidation is removed as JP57094578
Stone acid, citric acid
Work as during liquid and use nitric acid, hydrofluoric acid, sulfuric acid
Change hydrogen or permanganate and prevent that NOx from generating
2876 recommendations are except reaching with sulfuric acid, nitric acid, fluoride salt
The methylsulfuric acid ester; The method of CN87105097 invention is to remove zone of oxidation with the solution of sulfuric acid, SODIUMNITRATE, sodium-chlor, iron trichloride or ferric sulfate and water preparation.Above method all has certain effect that removes oxidizing layer of stainless steel.The purpose of this invention is to provide a kind of removal method of oxidizing layer of stainless steel efficiently, the zone of oxidation of preparation removes medicament and promptly guarantees just like the speed that removes and usefulness as hydrofluoric acid and the nitric acid
Change the contaminate environment of hydrogen and oxides of nitrogen gas.
The zone of oxidation that the present invention proposes removes liquid
Be called for short and remove liquid) be to provide hydrofluoric with the hydrolysis that adds fluoroboric acid and its esters except adding a certain amount of hydrofluoric acid:
KBF
4+H
2O→K[HOEF
3]+HF
H+
HBF
4＝＝＝BF
3+HF
Then molecular balance shifts to the right after HF has participated in reaction, produces new HF again.Remove in zone of oxidation and also to add nitric acid in the liquid, the oxynitride that produces in the time of should should be mentioned that nitric acid reaction especially is NOBF with the fluoro boron acid ion be combined into immediately
4, this is a kind of stable hard crystal, the available NO of this result imports HBF
4, in the solution and make (wet carat rope husband a general chemistry).Oxynitride is also overflowed and has just been participated in reaction like this, and adding that we can say fluoroboric acid and salt thereof is the absorption agent that a kind of hydrofluoric " savings bank " is again oxynitride, thus basically eliminate the pollution of two kinds of gas to air.What make in the real work that the people feels surprised is: remove and added fluoroboric acid (or its salt) back in the liquid extent of corrosion of human body is greatly descended, not only remove liquid and splash on the human body skin unconsciously cusalgia, even with the hand of not wearing any protector go to stir remove liquid also anacidity burn sensation, the operator who removes oxidizing layer of stainless steel has so just had the very solid sense of security.In removing the liquid process for preparation, look the zone of oxidation situation and add a certain amount of sulfuric acid, hydrochloric acid, hydrogen peroxide (H
2O
2) and perchloric acid (HClO
4) etc.
The prescription that zone of oxidation provided by the invention removes liquid is:
Fluoroboric acid and salt 0.1～40.0% thereof
Nitric acid (concentration 65%) 1.0～52.0%
Sulfuric acid (concentration 98%) 0.0～20.0%
Hydrochloric acid (concentration 35%) 0.0～10.0%
Hydrofluoric acid (concentration 45%) 1.0～40.0%
Perchloric acid (concentration 70%) 0～10%
Hydrogen peroxide (concentration 30%) 0～10%
Water surplus
Above each component can fluctuate in above-mentioned scope, and percentage ratio must not surpass absolutely.What prepare removes HNO in the liquid
3Content is difficult for surpassing 30%.Carry out at normal temperatures during preparation, each component can be added together to stir and form, also can hydrofluoric acid, fluoroboric acid (or its salt) and portion water is mixed even, and then mix with other components.During use stainless steel is placed the liquid that removes for preparing, embathe under 30～60 ℃, water cleans behind processing 10～40min.
Characteristics of the present invention are: select fluoroboric acid and its esters for use, utilize its hydrolysis reaction that partially fluorinated hydrogen is provided, can bind nitric acid simultaneously and participate in the oxynitride that reacts and produce, not only guaranteed to remove the high-effect of zone of oxidation, polluted air has not again guaranteed that simultaneously operational safety carries out.
Example 1:
Remove liquid in following ratio preparation zone of oxidation
KBF
414.0%
HNO
3（65%） 47.0%
HF（45%） 30%
H
2The O surplus
Common stainless steel material (CrNiTi) is placed abovely to deviate from liquid and embathe under 40～50 ℃ and handle 10～40min wash water washing back warehouse-in of can deviating to finish.
Used and lost efficacy deviate from liquid with white lime (Ca(OH)
2) handle it.
Example 2:
Deviate from liquid in following ratio preparation zone of oxidation:
KBF
414%
HF（45%） 15%
HClO
4（72%） 3%
HNO
3（65%） 44%
Water surplus
HNO wherein after the mixing
3Concentration 28%.
Claims (3)
1, a kind ofly remove the method for oxidizing layer of stainless steel, it is characterized in that the stainless steel that has zone of oxidation is put into the liquid of deviating from that is grouped into by following one-tenth to be handled with chemical agent:
Fluoroboric acid and salt 0.1～40.0% thereof
Nitric acid (concentration 65%) 1.0～52.0%
Hydrofluoric acid (concentration 45%) 1.0～40.0%
Water surplus
Treatment condition are to handle 10～40min down at 30～60 ℃
2, the method for claim 1 is characterized in that removing in the liquid formula and can add following component:
Sulfuric acid (concentration 98%) 0.0～20.0%
Hydrochloric acid (concentration 35%) 0.0～10.0%
Perchloric acid (concentration 70%) 0.0～10.0%
Hydrogen peroxide (concentration 30%) 0.0～10.0%
The compound method that removes liquid is: at room temperature hydrofluoric acid, fluoroboric acid and salt thereof and portion water are mixed, and then mix with other components.
3,, it is characterized in that the HNO in the liquid that removes for preparing as claim 1,2 described methods
3Content must not surpass 30%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90110300 CN1017728B (en) | 1990-12-29 | 1990-12-29 | Chemical process of removing oxidized layer of stainless steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90110300 CN1017728B (en) | 1990-12-29 | 1990-12-29 | Chemical process of removing oxidized layer of stainless steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1053647A CN1053647A (en) | 1991-08-07 |
| CN1017728B true CN1017728B (en) | 1992-08-05 |
Family
ID=4881856
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 90110300 Expired CN1017728B (en) | 1990-12-29 | 1990-12-29 | Chemical process of removing oxidized layer of stainless steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1017728B (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1081246C (en) * | 1999-07-29 | 2002-03-20 | 上海交通大学 | Multiple elements chemical etching agent for nickel-titanium alloy film |
| CN1254561C (en) * | 2003-03-10 | 2006-05-03 | 长庚大学 | Aqueous solution composition with metal surface treatment |
| CN102658690A (en) * | 2012-05-04 | 2012-09-12 | 东莞市华轩幕墙材料有限公司 | Self-cleaning aluminum veneer and preparation process |
| CN102632653A (en) * | 2012-05-04 | 2012-08-15 | 东莞市华轩幕墙材料有限公司 | Fluorocarbon spray coating and etching aluminum veneer and preparation process of fluorocarbon spray coating and etching aluminum veneer |
| CN102658691A (en) * | 2012-05-04 | 2012-09-12 | 东莞市华轩幕墙材料有限公司 | Ceramic aluminum single sheet and preparation process thereof |
| CN102703904A (en) * | 2012-06-08 | 2012-10-03 | 武汉钢铁(集团)公司 | Corrosion-inhibiting solution for extracting steel surface oxide with high silicon content and using method for corrosion-inhibiting solution |
| CN103663988B (en) * | 2013-10-25 | 2016-04-13 | 中国科学院上海光学精密机械研究所 | Preform surface-treated nitration mixture and treatment process |
| CN107350744A (en) * | 2017-07-25 | 2017-11-17 | 江苏星河阀门有限公司 | A kind of production technology of Double-ferrule type pipe joint for nuclear power generating sets |
| CN109509400A (en) * | 2018-12-03 | 2019-03-22 | 国网江苏省电力有限公司 | A kind of preparation method of open air atmospheric environment long-life two-dimension code label |
| CN115074740A (en) * | 2022-05-11 | 2022-09-20 | 哈尔滨焊接研究院有限公司 | Low-nickel austenitic stainless steel solid welding wire surface cleaning solution and cleaning method |
-
1990
- 1990-12-29 CN CN 90110300 patent/CN1017728B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN1053647A (en) | 1991-08-07 |
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| PB01 | Publication | ||
| C13 | Decision | ||
| GR02 | Examined patent application | ||
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| C19 | Lapse of patent right due to non-payment of the annual fee | ||
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