CN1067687A - The chemical stripping method of oxidizing layer of stainless steel - Google Patents
The chemical stripping method of oxidizing layer of stainless steel Download PDFInfo
- Publication number
- CN1067687A CN1067687A CN 91103948 CN91103948A CN1067687A CN 1067687 A CN1067687 A CN 1067687A CN 91103948 CN91103948 CN 91103948 CN 91103948 A CN91103948 A CN 91103948A CN 1067687 A CN1067687 A CN 1067687A
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- China
- Prior art keywords
- acid
- stainless steel
- salt
- liquid
- oxidizing layer
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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
- C23G1/086—Iron or steel solutions containing HF
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- 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)
Abstract
A kind of removal methods of oxidizing layer of stainless steel, adopt silicofluoric acid (or its salt), nitric acid, sulfuric acid, hydrochloric acid, hexafluorophosphoric acid (or its salt), LN-826 (or LN-500) and the formulated liquid that removes of water, remove when embathing body of stainless steel in the liquid and can keep certain density HF, and limited use certain density acid with oxidation capacity.The present invention can high-level efficiency deviate from oxidizing layer of stainless steel, and obnoxious flavoures such as no HF and oxynitride are overflowed and avoided polluted air, do not hinder the steel body simultaneously.
Description
The invention belongs to the chemical treatment method of oxidizing layer of stainless steel.
By metallic elements such as Cr, Ni, Ti and stainless steel that Fe smelts is outstanding steel grade in the alloy.Because it is attractive in appearance to have good chemical stability, physical strength and light, is applied to more and more widely among industrial production and the people's lives.Yet this surface often produces the zone of oxidation of one deck grey black, not only influences processing but also lose light, must be removed.The method that removes zone of oxidation normally adopts chemical liquid to embathe: 650 ℃ of rolling, then stainless steel plate is used HNO again 40～150 ℃ of following preheatings during as JP61049706 hot rolling austenite (Austenitic) stainless steel plate
3With HF or with the solution hydro-peening of hydrochloric acid and ferric salt or embathe with rust cleaning; JP61147888 is carrying out using HNO after mineral oil, high temperature oxidation, three processing of salt when the surface working of stainless steel sheet
3Handle down at 55 ℃ with HF; The solution that is mixed with oxide compound, sulfuric acid, hydrofluoric acid and the hexamethylenetetramine of chromium in DD244362 is 15～30 ℃ of following pickling, and for example CN8601522 then uses nitric acid, hydrofluoric acid, Magnesium Stearate, magnesium nitrate and sodium polyphosphate carry out pickling and can make its surface passivation.The pickled surface document is a lot of, though that it adds component is different, yet its main ingredient from not nitric acid; Hydrofluoric acid; And hydrochloric acid, sulfuric acid etc.These acid are carried out very soon with oxide layer on stainless steel surface (metal oxides such as Fe, Cr, Ni, Ti wait nonmetal oxide and mix therebetween charcoal) reaction, slough the grey black zone of oxidation rapidly and expose bright and clean polished bright surface, and removal effect is satisfactory.In the process of embathing, often be difficult to produce a large amount of oxynitride (NO, N with avoiding
2O, NO
2Deng) and hydrogen fluoride gas, normal contaminate environment seriously, thus also threaten the health of operation from the member.Great majority in well-known HF and the oxynitride have great stimulation and corrosive nature to the skin and the respiratory organs of human body, and HF can cause the human teeth to come off too early, and bone becomes fragile, when serious even threat to life.
The purpose of this invention is to provide and a kind ofly can either remove oxidizing layer of stainless steel effectively, do not have the method for hydrogen fluoride and oxynitride environmental pollution again.
Silicofluoric acid (Fluorosilicic acid) is the great acid of a kind of acidity, can with many metal oxides and carbonate reaction, hydrolyzable in water:
Its K=5.4 * 10
-27(" Off ア ィ Application Network ミ カ Le topical reference book " clear and in July, 57 is compiled by the Off ア ィ Application Network ミ カ Le topical reference book council that compiles, even p1028) H at normal temperatures
2SiF
6Disassociation more than 50% is also arranged, its strong solution cooling can be obtained colourless H
2SiF
6Disassociation more than 50% is also arranged, its strong solution cooling can be obtained colourless H
2SiF
62H
2The crystal of O, mp19 ℃, its dilute aqueous soln has following hydrolytic constant K=[SiF
4], [F ']
2/ [SF
6"]=7.10
-7(
.B.HEKPACOB " Kypc O
E ǔ XUMUU " MockBA.1952.p499).H
2SiF
6Dilute solution be stable, 13.3% solution is retortable and do not decompose H
2SiF
6Etching glass (GEORG BRAUER " Handbuch der Dr parativen anorgani-schen Chemie 1960 ") not.The present invention is according to above principle, adopt silicofluoric acid and its esters to remove one of main ingredient of liquid as oxidizing layer of stainless steel, with its HF of generating of hydrolysis successively, if after when removing zone of oxidation, consuming the HF of institute's hydrolysis generation, its hydrolysis reaction will carry out to producing into the HF direction, become the source of supply HF; K value because of hydrolysis reaction is very little again, and HF can not overflow and contaminate environment; H particularly
2SiF
6Etching glass not it serves to show that its control to the HF amount is proper, increases the sense of security when using simultaneously again.Limited uses of oxidation capacity that the present invention also satisfies when removing oxidizing layer of stainless steel is sour, and other mineral acids such as sulfuric acid.Be not more than oxidation in 11% o'clock at the nitric acid working concentration and only produce and be soluble in rare nitric acid, and the N of unique toxicity minimum in the oxynitride
2O has got rid of NO, NO
2Air-polluting possibility.The present invention also uses it according to hexafluorophosphoric acid, fluoroboric acid character also limitedly.
The prescription that oxidizing layer of stainless steel provided by the invention removes liquid is:
Silicofluoric acid (or its salt) 0.100～40.00%
Nitric acid (98%) 0.50～11.00%
Sulfuric acid (98%) 0.10～25.00%
Hydrochloric acid (36%) 0.00～20.00%
Hexafluorophosphoric acid (or its salt) 0.00～16.00%
Phosphoric acid (85%) 0.00～30.00%
Fluoroboric acid (or its salt) 0.00～4.00%
LN-826(or LN-500) 0.001～1.0%
Water surplus
Its compound method is at room temperature above each component materials to be added in the portion water by prescription to mix to dissolving, and the water that adds surplus afterwards stirs evenly and gets final product.Can at room temperature carry out when the stainless steel workpiece removes, also can under heating, carry out: workpiece is immersed remove in the liquid that 40～50min finishes under the room temperature; If also finish at 40～50 ℃ of next 30～20min.After taking out workpiece with flushing with clean water bright stainless steel surface appears at once.Do not produce any stimulation people's gas when removing the liquid preparation and embathing, there is no the calcination sensation when liquid splashes on the human body skin accidentally if remove, only needing does not promptly have any infringement with the timely flushing of clear water, fool proof to operator.Originally removing liquid can use repeatedly, as can fully utilize after losing efficacy or with Ca(OH)
2Handle it.
Characteristics of the present invention are: stainless steel remove liquid select for use silicofluoric acid as main ingredient be utilize its strongly-acid with and hydrolysis reaction required HF is provided, can control the HF concentration that removes in the liquid automatically, do not have HF and overflow; Remove in raising under the preceding topic of oxidation capacity of liquid and limit HNO
3Working concentration, prevent deleterious oxynitride (NO, NO
2) generation, both guaranteed the high-effect oxidizing layer of stainless steel that removes, polluted air not guarantees operational safety simultaneously again; The efficient height; Conservation and play corrosion inhibition again and do not hinder the steel body; Preparation removes liquid and embathes method very simple.
Example one
Remove liquid by following proportioning preparation
Silicofluoric acid (30%) 23.0%
Nitric acid (98%) 7.3%
Sulfuric acid (98%) 8.70%
LN-826 0.05%
Water surplus
The stainless steel workpiece (1Cr18Ni9Ti) that will have the grey black zone of oxidation is inserted removing in the liquid of preparing, and embathes at normal temperatures to take out behind 45～50min to get final product with flushing with clean water; It is shiny bright and clean to clean post-treatment spare.
Example two
Remove liquid by following formulated:
Silicofluoric acid (30%) 23.0%
Nitric acid (98%) 7.0%
Sulfuric acid (98%) 8.2%
MFP (67%) 1.0%
Water surplus
The stainless steel workpiece that has the grey black zone of oxidation is inserted above-mentioned removing in the liquid of filling a prescription, and the temperature that removes liquid is under 40～～50 ℃, embathes to take out behind 20～30min promptly to obtain stainless unsalted surface with flushing with clean water.
Example three
Remove liquid by following formulated:
Silicofluoric acid (30%) 22.0%
Nitric acid (98%) 7.0%
Sulfuric acid (98%) 8.1%
Sodium tetrafluoroborate 0.2%
Potassium fluoborate 0.07%
LN-500 0.05%
Water surplus
Deviate from example such as example one.
Claims (3)
1, a kind of method that removes oxidizing layer of stainless steel with chemical agent, the invention is characterized in that the stainless steel workpiece that will have zone of oxidation is put into by what silicofluoric acid (or its salt), nitric acid, sulfuric acid, hydrochloric acid, hexafluorophosphoric acid (or its salt), phosphoric acid, fluoroboric acid (or its salt) and water were mixed with removes liquid, uses flushing with clean water after embathing 55～20min under normal temperature～50 ℃.
2, the method that removes oxidizing layer of stainless steel as claimed in claim 1 the invention is characterized in consisting of of chemical removal liquid:
Silicofluoric acid (or its salt) 0.17～40.0%
Nitric acid (98%) 0.5～11.0%
Sulfuric acid (98%) 0.1～25.0%
Hydrochloric acid (36%) 0.0～20.0%
Hexafluorophosphoric acid (or its salt) 0.0～16.0%
Phosphoric acid (85%) 0.0～30.0%
Fluoroboric acid (or its salt) 0.0～4.0%
LN-826(or LN-500) 0.001～1.00%
Water surplus
More than each component can in above-mentioned scope, fluctuate, total percentage must not surpass absolutely; Removing liquid making method is: at room temperature material is added stir in the entry and form; If have solid components then to be dissolved in portion water earlier in the raw material, and then mix with other components and excess water.
3, as claim 1, the 2 described methods that remove oxidizing layer of stainless steel, the invention is characterized in the HNO in the liquid that removes for preparing
3Content must not surpass 11.0%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91103948 CN1029862C (en) | 1991-06-08 | 1991-06-08 | Chemical method for removing oxidized layer of stainless steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91103948 CN1029862C (en) | 1991-06-08 | 1991-06-08 | Chemical method for removing oxidized layer of stainless steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1067687A true CN1067687A (en) | 1993-01-06 |
| CN1029862C CN1029862C (en) | 1995-09-27 |
Family
ID=4906353
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91103948 Expired - Fee Related CN1029862C (en) | 1991-06-08 | 1991-06-08 | Chemical method for removing oxidized layer of stainless steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1029862C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100432296C (en) * | 2003-08-15 | 2008-11-12 | 东南大学 | Solution for removing oxide layer on surface of annealed stainless steel |
| CN103225087A (en) * | 2013-04-26 | 2013-07-31 | 河南师范大学 | Stainless steel pickling passivation paste and preparation method thereof |
| CN105018948A (en) * | 2015-07-22 | 2015-11-04 | 中冶南方工程技术有限公司 | Acid pickling method for hot rolled 304 Austenitic stainless steel |
| CN105986277A (en) * | 2015-02-03 | 2016-10-05 | 上海立昌环境工程有限公司 | Preparation of non-phosphorus neutral rust remover and application thereof |
-
1991
- 1991-06-08 CN CN 91103948 patent/CN1029862C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100432296C (en) * | 2003-08-15 | 2008-11-12 | 东南大学 | Solution for removing oxide layer on surface of annealed stainless steel |
| CN103225087A (en) * | 2013-04-26 | 2013-07-31 | 河南师范大学 | Stainless steel pickling passivation paste and preparation method thereof |
| CN105986277A (en) * | 2015-02-03 | 2016-10-05 | 上海立昌环境工程有限公司 | Preparation of non-phosphorus neutral rust remover and application thereof |
| CN105018948A (en) * | 2015-07-22 | 2015-11-04 | 中冶南方工程技术有限公司 | Acid pickling method for hot rolled 304 Austenitic stainless steel |
| CN105018948B (en) * | 2015-07-22 | 2018-07-24 | 中冶南方工程技术有限公司 | A kind of 304 austenitic stainless steel acid washing method of hot rolling |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1029862C (en) | 1995-09-27 |
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