CN1033655C - Passivating agent for removing oxidation scale on the surface of stainless steel - Google Patents
Passivating agent for removing oxidation scale on the surface of stainless steel Download PDFInfo
- Publication number
- CN1033655C CN1033655C CN 92111954 CN92111954A CN1033655C CN 1033655 C CN1033655 C CN 1033655C CN 92111954 CN92111954 CN 92111954 CN 92111954 A CN92111954 A CN 92111954A CN 1033655 C CN1033655 C CN 1033655C
- Authority
- CN
- China
- Prior art keywords
- stainless steel
- ammonium
- solution
- passivator
- oxide skin
- 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 - Lifetime
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
-
- 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
- C23C22/34—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 containing fluorides or complex fluorides
Landscapes
- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (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)
- Chemical Treatment Of Metals (AREA)
Abstract
The present invention relates to a passivator for removing the oxide skin of stainless steel. The passivator is prepared from 12 to 26% of ammonium nitrate, 2 to 12% of ammonium bifluoride or 2 to 16% of hydrofluoric acid, 0.5 to 4% of fatty acid ammonium and water. The present invention has easy production, safe transportation, favorable effect of removing the oxide skin of stainless steel, controllable thickness of the surface passivation film of the stainless steel, no mist in the application process and no environmental pollution.
Description
The invention belongs to a kind of solution of clean metal material, relate to the composition of the removing and the stainless steel surface passivation of stainless steel oxidation skin.
In the production process of STAINLESS STEEL WIRE, sheet material, tubing, will be through 800-1100 ℃ high-temperature heat treatment, form very solid oxide skin (layer) after the thermal treatment on the surface, removing of this oxide skin, prior art generally adopts the mixing acid of hydrofluoric acid and nitric acid to handle, but there is following shortcoming in this mode: in (1) treating processes, produce N
2O
2, NO
2, a large amount of toxic gases such as NO, HF, the smog severe contamination surrounding environment of formation can't be breathed the people, harm workman and the masses healthy on every side, to being worth the plant and equipment seriously corroded of tens million of units, farmland, water source etc. also is subjected to severe contamination; (2) to the stainless steel of high chrome high-nickel kind, for example: GH536,25Cr20Ni etc., oxide skin can not finely be eliminated, and what have can't remove, and quality product is relatively poor.Chinese patent application CN1053647A discloses a kind of chemical stripping method of oxidizing layer of stainless steel, system uses the mixed solution of fluoroborate, nitric acid, sulfuric acid, hydrochloric acid, hydrofluoric acid, perchloric acid, hydrogen peroxide to remove oxidizing layer of stainless steel (skin), though this mode has certain effect, but cost costliness, poor practicability can not avoid producing a large amount of toxic gas contaminate environment and infringement HUMAN HEALTH.
The present invention's purpose is intended to overcome above-mentioned weak point of the prior art, provides low, effective, the free of contamination stainless steel oxidation skin of a kind of cost to remove passivator.
Content of the present invention be one and the stainless steel oxidation skin remove passivator, its feature part is by 12～26% ammonium nitrate, 2～12% 2 ammonium hydrogen difluorides or 2～16% hydrofluoric acid, 0.5～4% lipid acid ammonium and 60～85% water are formed (weight %).
It is 14～26% ammonium nitrate that content of the present invention is formed (weight %) preferably, 6～10% difluoro hydrogenation ammoniums or 4～10% hydrofluoric acid, 0.5～2% lipid acid ammonium and 62～79% water.
In the content of the present invention, described lipid acid ammonium can be that ammonium stearate, Palmiticacid ammonium or other have the lipid acid ammonium of 1～18 carbon.
During use, solution is made in the weighing in proportion of the described each component of content of the present invention, mixing, dilution, STAINLESS STEEL WIRE, sheet material that oxide skin will be arranged again are or/and tubing places solution, (general stainless steel soaks at normal temperatures to soak taking-up in about 15 minutes, high chrome high-nickel stainless steel can soak down at 40～80 ℃), promptly obtain removing descaling, and be formed with the stainless steel of passive film.
Compared with prior art, the present invention has following characteristics:
(1) the present invention is the mixing solutions of etching reagent, oxygenant and complexing agent, has the stainless steel of oxide skin (layer) to immerse in this solution, and the oxide skin burn into becomes flexible, comes off, and the stainless steel surface oxidation is formed passive film, because Fe
3+, Cr
3+, Ni
2+Deng constantly forming complex compound (with NH
4 +, F
-, RCOO
-Deng), oxide skin is removed the usefulness height, and the stainless oxide skin of high chrome high-nickel also can be removed fully;
(2) in the component of the present invention, it is acid that difluoro hydrogenation ammonium shows, and can distil, in about 80 ℃ of hot water, decompose, because use temperature is generally below 70 ℃, and F in the solution
-, NH
4 +All very fast and metal ion form complex compound, thereby no obnoxious flavour HF, NH in the use
3Produce; The lipid acid ammonium had both had complexing usefulness in solution, have emulsifying effect again, and solution surface promptly in sight forms emulsifying film, has a small amount of gas evolution promptly to be absorbed in the solution; So in whole scavenging process, non smoke produces, environmentally safe is harmless to HUMAN HEALTH;
(3) by adjusting strength of solution of the present invention, can also control the thickness of stainless steel surface passive film, make stainless steel surface formation film, thick film or do not have film, good product quality or/and the each component ratio can not only be removed the stainless oxide skin of high chrome high-nickel;
(4) product preparation easily, the first danger of convenient transportation, can preparation when using, need equipment few, the workman is easy to operate understandable, and is non-volatile, never degenerate, can prolonged preservation, with low cost.
Below by embodiment the present invention is further described:
Embodiment 1: a kind of stainless steel oxidation skin is removed passivator, presses ammonium nitrate (NH
4NO
3) 24 parts, difluoro hydrogenation ammonium (NH
4HF
2) 10 parts, the ratio of 4 parts of ammonium stearate, 62 parts in water, with the each component weighing, be mixed into solution and constitute.
To have (heat treated) Stainless Steel Wire of oxide skin or pipe etc., and at room temperature put into above-mentioned solution and soak after 15 minutes and propose, use flushing with clean water again through 800～1100 ℃.The pure white light of stainless steel surface has silvery white passive film, shows metalluster.Solution does not have corrosion to stainless steel base.In the immersion process, non smoke produces.
Embodiment 2: a kind of stainless steel oxidation skin is removed passivator, and by 1.5 parts in 10 parts in ammonium nitrate, 8.5 parts of difluoro hydrogenation ammoniums, lipid acid ammonium (for example ammonium stearate etc.), water mixes for 80 parts and forms, and is colourless transparent solution.
To have the stainless steel of oxide skin at room temperature to immerse in this solution, take out the back about 15 minutes, uses flushing with clean water.Oxide skin is eliminated, and obtains the stainless steel that there is pure white bright passive film on the surface, shows metalluster.Solution does not have corrosion to stainless steel base, uses in this solution process, and non smoke produces.
Embodiment 3: a kind of stainless steel oxidation skin is removed passivator, is made up of for 60 parts 24 parts in ammonium nitrate, 12 parts in hydrofluoric acid, 4 parts of Palmiticacid ammoniums, water, each component weighing in proportion, is mixed into colourless transparent solution.
The nickelic high chromium-stainless steel (for example: 25Cr20Ni, GH536 etc.) that will have oxide skin is put into this solution, under 50 ℃ temperature, through 18 minutes, take out and use flushing with clean water, the Stainless Steel Watch surface oxidized skin is eliminated totally, and the surface forms the passive film of pure white light, and non smoke produces in the treating processes.
Embodiment 4: a kind of stainless steel oxidation skin is removed passivator, in the ratio of 14 parts in ammonium nitrate, 6 parts in hydrofluoric acid, 1 part of ammonium stearate, 79 parts in water, with each component weighing in proportion, is mixed into solution and constitutes.
The nickelic high chromium-stainless steel that will have oxide skin is soaked in this solution, under 70 ℃ temperature, takes out after 20 minutes, uses flushing with clean water again, and oxide skin is eliminated dried striving, and stainless steel surface is formed with the passive film of pure white light, in use non smoke.
Claims (2)
1, a kind of stainless steel oxidation skin is removed passivator, it is characterized in that forming (weight %) by 12～26% ammonium nitrate, 2～12% difluoro hydrogenation ammoniums or 2～16% hydrofluoric acid, 0.5～4% lipid acid ammonium and 60～85% water, described lipid acid ammonium can be that ammonium stearate, Palmiticacid ammonium or other have the lipid acid ammonium of 1～18 carbon.
2, remove passivator by the described stainless steel oxidation skin of claim 1, it is characterized in that forming (weight %) is 14～26% ammonium nitrate, 6～10% difluoro hydrogenation ammoniums or 4～10% hydrofluoric acid, 0.5～2% lipid acid ammonium and 62～79% water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92111954 CN1033655C (en) | 1992-10-22 | 1992-10-22 | Passivating agent for removing oxidation scale on the surface of stainless steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92111954 CN1033655C (en) | 1992-10-22 | 1992-10-22 | Passivating agent for removing oxidation scale on the surface of stainless steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1085960A CN1085960A (en) | 1994-04-27 |
| CN1033655C true CN1033655C (en) | 1996-12-25 |
Family
ID=4945648
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92111954 Expired - Lifetime CN1033655C (en) | 1992-10-22 | 1992-10-22 | Passivating agent for removing oxidation scale on the surface of stainless steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1033655C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1306063C (en) * | 2004-08-12 | 2007-03-21 | 刘万青 | Non-chromium furifying agent for copper refrigerating article |
| CN103590028A (en) * | 2012-08-14 | 2014-02-19 | 苏州一方金属表面处理科技有限公司 | Cold-rolled sheet passivator |
| CN103046064B (en) * | 2012-12-18 | 2015-08-12 | 浙江大学 | A kind of acid-washing stainless steel substituting agent and preparation method thereof |
-
1992
- 1992-10-22 CN CN 92111954 patent/CN1033655C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CN1085960A (en) | 1994-04-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| AU2002252617B2 (en) | Hydrogen peroxide pickling scheme for stainless steel grades | |
| CA1057630A (en) | Metal dissolution process | |
| EP0188975B1 (en) | Process for the acid pickling of steels, in particular stainless steels | |
| WO2001087771A1 (en) | Method and device for the reduction of nitrogen protoxide | |
| CN1033655C (en) | Passivating agent for removing oxidation scale on the surface of stainless steel | |
| KR890001379B1 (en) | Method of controlling oxide scale formation and descaling thereof from method articles | |
| JP4543519B2 (en) | Manufacturing method of titanium cold rolled sheet | |
| CA1046387A (en) | Method and composition for cleaning the surface of ferrous metal | |
| CN86103534A (en) | The quick forming method of the weather resisting anti-rust film of steel | |
| US7138069B2 (en) | Method of surface-finishing stainless steel after descaling | |
| CN1079009A (en) | Acid washing liquid for stainless steel and using method | |
| EP0592892A1 (en) | Process for continuous titanium sheet pickling and passivation without using nitric acid | |
| US2965521A (en) | Metal pickling solutions and methods | |
| WO2003048418A2 (en) | Method for pickling martensitic or ferritic high-grade steel | |
| CN1017728B (en) | Chemical process of removing oxidized layer of stainless steel | |
| JP3829731B2 (en) | Manufacturing method and lubricant for titanium material | |
| JP3895824B2 (en) | Surface passivation treatment method for stainless steel | |
| EP1377692A1 (en) | Hydrogen peroxide pickling of silicon-containing electrical steel grades | |
| AU2002307176A1 (en) | Hydrogen peroxide pickling of silicon-containing electrical steel grades | |
| CN1029862C (en) | Chemical method for removing oxidized layer of stainless steel | |
| EP0248431A2 (en) | Method of producing outer coating layers on heat and corrosion resistant austenitic steels | |
| DE1496639B1 (en) | Process for the production of a glass with increased breaking strength | |
| CN1031419C (en) | Peeling method for enabling stainless steel surface to achieve silvery effect | |
| DE3412329C2 (en) | ||
| JPH0219486A (en) | Film removing treatment of metal and alloy |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee |