CN104562018B - A kind of smokeless minute surface chemical polishing solution - Google Patents
A kind of smokeless minute surface chemical polishing solution Download PDFInfo
- Publication number
- CN104562018B CN104562018B CN201410754565.9A CN201410754565A CN104562018B CN 104562018 B CN104562018 B CN 104562018B CN 201410754565 A CN201410754565 A CN 201410754565A CN 104562018 B CN104562018 B CN 104562018B
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- CN
- China
- Prior art keywords
- smokeless
- minute surface
- surface chemical
- chemical polishing
- intermixture
- 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.)
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- 238000005498 polishing Methods 0.000 title claims abstract description 39
- 239000000126 substance Substances 0.000 title claims abstract description 18
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims abstract description 22
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims abstract description 11
- 230000007797 corrosion Effects 0.000 claims abstract description 7
- 238000005260 corrosion Methods 0.000 claims abstract description 7
- 230000001590 oxidative effect Effects 0.000 claims abstract description 7
- 239000007800 oxidant agent Substances 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000003054 catalyst Substances 0.000 claims abstract description 5
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 8
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 claims description 8
- 125000001402 nonanoyl group Chemical group O=C([*])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 claims description 6
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 claims description 5
- 229910002113 barium titanate Inorganic materials 0.000 claims description 5
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 claims description 5
- 229910000366 copper(II) sulfate Inorganic materials 0.000 claims description 5
- WLYAEQLCCOGBPV-UHFFFAOYSA-N europium;sulfuric acid Chemical compound [Eu].OS(O)(=O)=O WLYAEQLCCOGBPV-UHFFFAOYSA-N 0.000 claims description 4
- 229910052943 magnesium sulfate Inorganic materials 0.000 claims description 4
- 235000019341 magnesium sulphate Nutrition 0.000 claims description 4
- 235000019830 sodium polyphosphate Nutrition 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 claims description 4
- 229960001763 zinc sulfate Drugs 0.000 claims description 4
- 229910000368 zinc sulfate Inorganic materials 0.000 claims description 4
- 239000003153 chemical reaction reagent Substances 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 claims description 2
- 239000003795 chemical substances by application Substances 0.000 claims 1
- 239000002253 acid Substances 0.000 abstract description 10
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 239000007789 gas Substances 0.000 abstract description 3
- 231100001261 hazardous Toxicity 0.000 abstract description 3
- 231100000614 poison Toxicity 0.000 abstract description 3
- 230000007096 poisonous effect Effects 0.000 abstract description 3
- 238000007517 polishing process Methods 0.000 abstract description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 2
- 239000003546 flue gas Substances 0.000 abstract description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 9
- 229910052782 aluminium Inorganic materials 0.000 description 9
- 239000004411 aluminium Substances 0.000 description 9
- 229910017604 nitric acid Inorganic materials 0.000 description 7
- 239000012530 fluid Substances 0.000 description 6
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 5
- 230000008901 benefit Effects 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 239000005864 Sulphur Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Natural products NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- -1 alkyl thiourea Chemical compound 0.000 description 1
- UMGDCJDMYOKAJW-UHFFFAOYSA-N aminothiocarboxamide Natural products NC(N)=S UMGDCJDMYOKAJW-UHFFFAOYSA-N 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000000505 pernicious effect Effects 0.000 description 1
- 238000006557 surface reaction Methods 0.000 description 1
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
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F3/00—Brightening metals by chemical means
- C23F3/02—Light metals
- C23F3/03—Light metals with acidic solutions
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)
- Chemical Treatment Of Metals (AREA)
- ing And Chemical Polishing (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
The invention discloses a kind of smokeless minute surface chemical polishing solution, it is prepared by the water of 75 ~ 80% phosphoric acid of percentage by weight, 3 ~ 4% sulfuric acid, 0.5 ~ 1% brightener, 0.8 ~ 1.2% oxidant, 0.5 ~ 0.6% corrosion inhibiter, 0.1 ~ 0.3% accelerator, 0.5 ~ 0.7 ‰ catalyst and surplus.The smokeless minute surface chemical polishing solution, any flue gas is not produced in polishing process, produced without excitant or potential poisonous and hazardous gas yet, it is environmentally safe;It is fast to go out ray velocity during polishing, brightness value is almost consistent with three acid polishing;It is simple to operate, the relation of temperature and time need to be only taken into account in actual production, without considering other, to save employment cost using producer.
Description
Technical field
The invention belongs to chemical polishing technical field, specially a kind of smokeless minute surface chemical polishing solution.
Background technology
What is be most widely used in the chemical polishing of current aluminium is exactly the three acid polishing of phosphorus acid-sulfur acid-nitric acid composition.
The mass ratio of phosphorus acid-sulfur acid-nitric acid substantially 6:3:1, operation temperature is about at 100 DEG C or so.Because aluminium is by chemistry
There is a good dicoration after polishing and be widely used in the fields such as household electrical appliances, automobile, bathroom, door and window, electronics, ornaments.
But the strong oxidizing property due to nitric acid, volatility and unstability when being reduced so that nitric acid transport it is filling,
Tank liquor configuration, it is daily add, heat up heating, production operation when many potential safety hazards and harm be present.Particularly polished in aluminium
In operation process, nitric acid by aluminium it is strong be reduced into poisonous and hazardous NO2Tobacco, body and mind is caused to injure operating personnel, simultaneously
Equipment is caused to corrode, environment is polluted.Meanwhile nitric acid constantly consumes with the progress of production, adding by rule of thumb
Often it is difficult to ensure that product quality is remained the same from beginning to end.
The content of the invention
It is an object of the invention to provide a kind of polishing, brightness is high, the nothing without pernicious gas in easy to operate, actual production
Cigarette minute surface chemical polishing solution.
The technical solution adopted by the present invention:
A kind of smokeless minute surface chemical polishing solution, is by 75 ~ 80% phosphoric acid of percentage by weight, 3 ~ 4% sulfuric acid, 0.5 ~ 1%
Brightener, 0.8 ~ 1.2% oxidant, 0.5 ~ 0.6% corrosion inhibiter, 0.1 ~ 0.3% accelerator, 0.5 ~ 0.7 ‰ catalyst
It is prepared with the water of surplus.
Preferably, the concentration of the phosphoric acid is 85%, the concentration of sulfuric acid is 98%, and the mass values of phosphoric acid and sulfuric acid are not
Less than 20:1.
Preferably, the brightener is the intermixture of barium titanate and cupric sulfate pentahydrate.
Preferably, the oxidant is the intermixture of two different nonanoyl of peroxidating and acetone.
Preferably, the corrosion inhibiter is the intermixture of N- alkyl thioureas and sodium polyphosphate.
Preferably, the accelerator is the intermixture of magnesium sulfate and zinc sulfate.
Preferably, the catalyst is reagent grade sulfuric acid europium.
A kind of preparation method of smokeless minute surface chemical polishing solution, it is characterised in that comprise the following steps:By weight percentage
The smokeless minute surface chemical polishing solution component being prepared is sequentially placed into temperature controllable reactor, 70 ~ 80 DEG C are heated up to, in constant temperature
Under conditions of stir 0.5 hour and be made.
Compared with prior art, the advantages of a kind of smokeless minute surface chemical polishing solution of the invention:
1)Any flue gas is not produced in aluminium polishing process, without excitant or potential poisonous and hazardous gas yet
Produce, it is environmentally safe;2)Polishing fluid is good to aluminium compatibility, can substitute in practice almost 95% three acid polishing liquid, produces
Huge environmental benefit and economic benefit;3)It is fast to go out ray velocity during polishing, brightness value is almost consistent with three acid polishing, polishes texture
As three acid polishing, stable components, effect such as one;4)Even if new polishing fluid is not added in production for a long time, polishing brightness and
Texture also can be consistent all the time, significantly improves polishing product qualified rate;5)It is simple to operate, in actual production only need to take into account temperature and when
Between relation, without considering other, for using producer save employment cost.
Embodiment
Embodiment 1
Smokeless minute surface chemical polishing solution, 75% concentration by weight percentage is 85% phosphoric acid, 3% concentration is 98% sulphur
Acid, 0.5% barium titanate and the intermixture of cupric sulfate pentahydrate, the intermixture of 0.8% two different nonanoyl of peroxidating and acetone, 0.5%
The intermixture of N- alkyl thioureas and sodium polyphosphate, the intermixture of 0.1% magnesium sulfate and zinc sulfate, 0.5% level europium sulfate and
Excess water is made into 100% and is sequentially placed into temperature controllable reactor, is heated up to 75 DEG C, stirs 0.5 hour and makes under conditions of constant temperature
Into.And concentration is 85% phosphoric acid and concentration is that ratio of 98% sulfuric acid in quality is 20:1.
Embodiment 2
Smokeless minute surface chemical polishing solution, 80% concentration by weight percentage is 85% phosphoric acid, 4% concentration is 98% sulphur
Acid, the intermixture of 1% barium titanate and cupric sulfate pentahydrate, 1.2% two different nonanoyl of peroxidating and intermixture, 0.6% N- of acetone
The intermixture of alkyl thiourea and sodium polyphosphate, the intermixture of 0.3% magnesium sulfate and zinc sulfate, 0.7% level europium sulfate and remaining
Amount water is made into 100% and is sequentially placed into temperature controllable reactor, is heated up to 80 DEG C, stirs 0.5 hour and be made under conditions of constant temperature.
And concentration is 85% phosphoric acid and concentration is that ratio of 98% sulfuric acid in quality is 20:1.
The alternative tradition of smokeless minute surface chemical polishing solution " three acid " being prepared by repeatedly putting into practice polishes, in polishing fluid
Brightener in anhydrous cupric sulfate both accelerated the ray velocity that goes out of aluminium, reduce polishing time, while polishing is lifted off in aluminium
After liquid, barium titanate and aluminium material surface reaction film forming, protect gloss not by acid solution excessive corrosion, the oxidant of polishing fluid is peroxidating
Two different nonanoyls replace the strong oxidation of nitric acid in three acid polishing, and synergy is produced with corrosion inhibiter, control fiber crops in polishing process
Point, the generation for corroding line trace, the catabolite of two different nonanoyl of peroxidating are water and carbon dioxide, the various composition ratio of polishing fluid
Once it is determined that, its polishing effect is also stablized therewith, and as polishing fluid continues on and adds, it polishes brightness and texture and more made one
It is satisfied.
Above example is only to introduce the preferred case of the present invention, to those skilled in the art, without departing substantially from this
Any obvious changes and improvements carried out in the range of spirit, it is regarded as the part of the present invention.
Claims (2)
- A kind of 1. smokeless minute surface chemical polishing solution, it is characterised in that be by percentage by weight 75~80% phosphoric acid, 3~4% Sulfuric acid, 0.5~1% brightener, 0.8~1.2% oxidant, 0.5~0.6% corrosion inhibiter, 0.1~0.3% plus The water of fast agent, 0.5~0.7 ‰ catalyst and surplus is prepared, and the concentration of the phosphoric acid is 85%, and the concentration of sulfuric acid is 98%, and the mass values of phosphoric acid and sulfuric acid are not less than 20:1, the brightener is the intermixture of barium titanate and cupric sulfate pentahydrate, The oxidant is the intermixture of two different nonanoyl of peroxidating and acetone, and the corrosion inhibiter is N- alkyl thioureas and sodium polyphosphate Intermixture, the accelerator are the intermixture of magnesium sulfate and zinc sulfate, and the catalyst is reagent grade sulfuric acid europium.
- 2. a kind of preparation method of smokeless minute surface chemical polishing solution as claimed in claim 1, it is characterised in that including following step Suddenly:The smokeless minute surface chemical polishing solution component being prepared is sequentially placed into temperature controllable reactor by weight percentage, heated To 70~80 DEG C, stir 0.5 hour and be made under conditions of constant temperature.
Priority Applications (1)
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CN201410754565.9A CN104562018B (en) | 2014-12-11 | 2014-12-11 | A kind of smokeless minute surface chemical polishing solution |
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CN201410754565.9A CN104562018B (en) | 2014-12-11 | 2014-12-11 | A kind of smokeless minute surface chemical polishing solution |
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CN104562018A CN104562018A (en) | 2015-04-29 |
CN104562018B true CN104562018B (en) | 2017-11-14 |
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Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
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CN105200431A (en) * | 2015-10-13 | 2015-12-30 | 深圳市沙特尔工业材料有限公司 | Aluminium product polishing method |
CN108265299A (en) * | 2017-01-03 | 2018-07-10 | 武汉材料保护研究所 | A kind of addition metal calcium ion diacid chemical polishing fluid |
CN107740110A (en) * | 2017-10-31 | 2018-02-27 | 江门市翰腾盛曦光电科技有限公司 | A kind of Al-alloy products chemistry mirror finish tank liquor |
CN107740111A (en) * | 2017-11-03 | 2018-02-27 | 安徽新合富力科技有限公司 | A kind of pack alloy chemically polishing method |
CN112831789A (en) * | 2020-12-31 | 2021-05-25 | 中山市和胜智能家居配件有限公司 | Chemical polishing additive and preparation method and application thereof |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58120781A (en) * | 1982-01-13 | 1983-07-18 | Sakae Tajima | Chemical polishing method for aluminum and aluminum alloy |
CN1869286A (en) * | 2005-05-27 | 2006-11-29 | 佛山市顺德区汉达精密电子科技有限公司 | Polishing agent |
CN101476126A (en) * | 2009-01-19 | 2009-07-08 | 山西大学 | Aluminum product chemical polishing solution and polishing method thereof |
CN102260461A (en) * | 2011-07-01 | 2011-11-30 | 佛山科学技术学院 | Smoke-free polishing treatment solution for high-gloss aluminum sectional material and use method thereof |
CN103668212A (en) * | 2013-11-09 | 2014-03-26 | 殷定江 | Aluminum alloy polishing process |
-
2014
- 2014-12-11 CN CN201410754565.9A patent/CN104562018B/en active Active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58120781A (en) * | 1982-01-13 | 1983-07-18 | Sakae Tajima | Chemical polishing method for aluminum and aluminum alloy |
CN1869286A (en) * | 2005-05-27 | 2006-11-29 | 佛山市顺德区汉达精密电子科技有限公司 | Polishing agent |
CN101476126A (en) * | 2009-01-19 | 2009-07-08 | 山西大学 | Aluminum product chemical polishing solution and polishing method thereof |
CN102260461A (en) * | 2011-07-01 | 2011-11-30 | 佛山科学技术学院 | Smoke-free polishing treatment solution for high-gloss aluminum sectional material and use method thereof |
CN103668212A (en) * | 2013-11-09 | 2014-03-26 | 殷定江 | Aluminum alloy polishing process |
Non-Patent Citations (1)
Title |
---|
铝合金无黄烟化学抛光机理的研究;陈绍广等;《电镀与环保》;20100930;第30卷(第5期);第25-26页1 实验 * |
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