US20110253169A1 - Solution for removing titanium-containing coatings and method for same - Google Patents
Solution for removing titanium-containing coatings and method for same Download PDFInfo
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- US20110253169A1 US20110253169A1 US12/974,200 US97420010A US2011253169A1 US 20110253169 A1 US20110253169 A1 US 20110253169A1 US 97420010 A US97420010 A US 97420010A US 2011253169 A1 US2011253169 A1 US 2011253169A1
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- acid
- aqueous solution
- titanium
- accelerant
- solution
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- 238000000576 coating method Methods 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 24
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 title claims abstract description 19
- 239000010936 titanium Substances 0.000 title claims abstract description 19
- 229910052719 titanium Inorganic materials 0.000 title claims abstract description 19
- 239000011248 coating agent Substances 0.000 claims abstract description 29
- 239000000758 substrate Substances 0.000 claims abstract description 28
- UMGDCJDMYOKAJW-UHFFFAOYSA-N thiourea Chemical compound NC(N)=S UMGDCJDMYOKAJW-UHFFFAOYSA-N 0.000 claims abstract description 18
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Natural products NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000002253 acid Substances 0.000 claims abstract description 13
- 150000003585 thioureas Chemical class 0.000 claims abstract description 6
- LCKIEQZJEYYRIY-UHFFFAOYSA-N Titanium ion Chemical compound [Ti+4] LCKIEQZJEYYRIY-UHFFFAOYSA-N 0.000 claims abstract description 4
- 150000001414 amino alcohols Chemical class 0.000 claims abstract description 4
- 239000004202 carbamide Substances 0.000 claims abstract description 4
- 235000013877 carbamide Nutrition 0.000 claims abstract description 4
- 150000007522 mineralic acids Chemical class 0.000 claims abstract description 4
- 150000007524 organic acids Chemical class 0.000 claims abstract description 4
- 150000003839 salts Chemical class 0.000 claims abstract description 4
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 20
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 18
- 239000007864 aqueous solution Substances 0.000 claims description 18
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 9
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 9
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 9
- 239000001117 sulphuric acid Substances 0.000 claims description 9
- 235000011149 sulphuric acid Nutrition 0.000 claims description 9
- HZAXFHJVJLSVMW-UHFFFAOYSA-N 2-Aminoethan-1-ol Chemical compound NCCO HZAXFHJVJLSVMW-UHFFFAOYSA-N 0.000 claims description 6
- MIMUSZHMZBJBPO-UHFFFAOYSA-N 6-methoxy-8-nitroquinoline Chemical compound N1=CC=CC2=CC(OC)=CC([N+]([O-])=O)=C21 MIMUSZHMZBJBPO-UHFFFAOYSA-N 0.000 claims description 6
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 claims description 6
- NROKBHXJSPEDAR-UHFFFAOYSA-M potassium fluoride Chemical compound [F-].[K+] NROKBHXJSPEDAR-UHFFFAOYSA-M 0.000 claims description 6
- PUZPDOWCWNUUKD-UHFFFAOYSA-M sodium fluoride Chemical compound [F-].[Na+] PUZPDOWCWNUUKD-UHFFFAOYSA-M 0.000 claims description 6
- MTPVUVINMAGMJL-UHFFFAOYSA-N trimethyl(1,1,2,2,2-pentafluoroethyl)silane Chemical compound C[Si](C)(C)C(F)(F)C(F)(F)F MTPVUVINMAGMJL-UHFFFAOYSA-N 0.000 claims description 6
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- -1 zirconium sodium fluoride Chemical compound 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 235000011054 acetic acid Nutrition 0.000 claims description 3
- 235000015165 citric acid Nutrition 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 claims description 3
- 239000004310 lactic acid Substances 0.000 claims description 3
- 235000014655 lactic acid Nutrition 0.000 claims description 3
- 235000003270 potassium fluoride Nutrition 0.000 claims description 3
- 239000011698 potassium fluoride Substances 0.000 claims description 3
- 229910052708 sodium Inorganic materials 0.000 claims description 3
- 239000011734 sodium Substances 0.000 claims description 3
- 235000015424 sodium Nutrition 0.000 claims description 3
- 235000013024 sodium fluoride Nutrition 0.000 claims description 3
- 239000011775 sodium fluoride Substances 0.000 claims description 3
- 229910000881 Cu alloy Inorganic materials 0.000 claims description 2
- 229910045601 alloy Inorganic materials 0.000 claims description 2
- 239000000956 alloy Substances 0.000 claims description 2
- 238000007654 immersion Methods 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims description 2
- 239000000243 solution Substances 0.000 description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 13
- 239000010935 stainless steel Substances 0.000 description 7
- 229910001220 stainless steel Inorganic materials 0.000 description 7
- 239000008367 deionised water Substances 0.000 description 5
- 229910021641 deionized water Inorganic materials 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 3
- 238000002441 X-ray diffraction Methods 0.000 description 2
- HMUNWXXNJPVALC-UHFFFAOYSA-N 1-[4-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]piperazin-1-yl]-2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethanone Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)N1CCN(CC1)C(CN1CC2=C(CC1)NN=N2)=O HMUNWXXNJPVALC-UHFFFAOYSA-N 0.000 description 1
- VZSRBBMJRBPUNF-UHFFFAOYSA-N 2-(2,3-dihydro-1H-inden-2-ylamino)-N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]pyrimidine-5-carboxamide Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C(=O)NCCC(N1CC2=C(CC1)NN=N2)=O VZSRBBMJRBPUNF-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000005524 ceramic coating Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- GPRLSGONYQIRFK-UHFFFAOYSA-N hydron Chemical compound [H+] GPRLSGONYQIRFK-UHFFFAOYSA-N 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000001455 metallic ions Chemical class 0.000 description 1
- 238000000386 microscopy Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000035515 penetration Effects 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
- 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
Definitions
- the present disclosure relates to a solution for removing titanium-containing coatings and a related method.
- Hard ceramic coatings such as titanium nitride and titanium carbide, impart specific properties to workpieces such as machining tools, die core-pins, and high temperature devices. These hard coatings resist wear, abrasion, oxidation, and corrosion, and reduce susceptibility to chemical reactions on the workpieces to which they are applied. These coatings, however, can fail locally during use or manufacture.
- the present disclosure relates to a solution and a related method for removing titanium-containing coatings formed on the surfaces of substrates.
- the titanium-containing coating may be titanium nitride coating, titanium carbide coating, or titanium carbonitride coating.
- the substrate may be metal or plastic.
- the metal may be ferric-based alloy, copper, or copper alloy.
- the solution may be an aqueous solution containing acid, accelerant, secondary accelerator, and inhibiter.
- the acid may be inorganic acid or organic acid providing hydrogen ions, such as sulphuric acid, acetic acid, citric acid, or lactic acid, or a combination thereof.
- sulphuric acid can be selected.
- the concentration of the acid selected may be about 90-1000 g/L, and is in this exemplary embodiment it is about 90-750 g/L.
- the accelerant may speed dissolution of metallic ions of the titanium-containing coatings into the solution.
- the accelerant may be acid or salt which contains fluorinion.
- the accelerant may be hydrofluoric acid, ammonium bifluoride, sodium fluoride, potassium fluoride, sodium fluoborate, or zirconium sodium fluoride, or a combination thereof, and in this exemplary embodiment it is hydrofluoric acid and/or ammonium bifluoride.
- the concentration of the accelerant selected may be about 70-500 g/L and in this exemplary embodiment it is about 75-300 g/L.
- the secondary accelerator can diminish the surface tension of the solution, facilitate the dissolving of the coatings, and accelerate the penetration of the hydrogen ion.
- the secondary accelerator may be generic amino alcohols and can combine with titanium ion.
- the secondary accelerator may be ethanolamine, diethanolamine, or triethanolamine, or a combination thereof, and in this exemplary embodiment it is triethavolamine.
- the concentration of the secondary accelerator selected may be about 15-200 g/L, and in this exemplary embodiment it is about 30-80 g/L.
- the inhibiter protects the substrate from being etched by the acid.
- the inhibiter may be thiourea, thiourea derivatives, or carbamide, or a combination thereof, and in this exemplary embodiment it is thiourea or thiourea derivatives.
- the concentration of the inhibiter selected may be about 2-8 g/L, and in this exemplary embodiment it is about 3-5 g/L.
- the solution may be prepared by dissolving the acid, accelerant, secondary accelerator, and inhibiter in water.
- the method for removing the titanium-containing coating formed on the substrate may include steps of providing the solution, and contacting the substrate combined with a titanium-containing coating to the solution.
- the coating can be effectively removed from the substrate and the underlying base is free from damage by the present method.
- the substrate may contact the solution by immersion or spraying.
- the solution may have a temperature of about 20-30° C.
- Contact time between the substrate and the solution may be 0.5-2 hours. After contact, the substrate may be rinsed with water and then dried.
- 50ml sulphuric acid having a concentration of 98 wt % and 5 g thiourea was added into 500 ml deionized water. Then, 200 ml hydrofluoric acid having a concentration of 40 wt % and 50 ml triethanolamine having a concentration of 80 wt % were added into the water solution. The water solution was supplemented with deionized water to 1000 ml. The solution was formed and contained the sulphuric acid with a concentration of about 90.16 g/L; the hydrofluoric acid with a concentration of about 90.4 g/L; the triethanolamine with a concentration of about 40.8 g/L.
- the stainless steel substrate had a coating selected from one of the titanium nitride coating, titanium carbide coating, and titanium carbonitride coating.
- the coating had a thickness of about 2 ⁇ m.
- the samples were completely immersed in the solution for about 1.5 hours at a temperature of about 25° C. During this process, the coatings were removed. Then, the samples were taken out of the solution and were dried after being rinsed with water.
- sulphuric acid having a concentration of 98 wt % and 5 g thiourea was added into 500 ml deionized water. Then, 175 ml hydrofluoric acid having a concentration of 40 wt % and 54 ml triethanolamine having a concentration of 80 wt % were added into the solution. The solution was supplemented with deionized water to 1000 ml. The solution was formed and contained the sulphuric acid with a concentration of about 99.18 g/L; the hydrofluoric acid with a concentration of about 79.11 g/L; the triethanolamine with a concentration of about 44.88 g/L.
- the stainless steel substrate had a titanium carbide coating.
- the coating had a thickness of about 1.5 ⁇ m.
- the samples were completely immersed in the solution for about 1 hour at a room temperature. During this process, the coating was removed. Then, the samples were taken out of the solution and were dried after being rinsed with water.
- the stainless steel substrate had a titanium carbonitride coating.
- the coating had a thickness of about 2 ⁇ m.
- the samples were completely immersed in the solution for about 2 hours at a room temperature. During this process, the coating was removed. Then, the samples were taken out of the solution and were dried after being rinsed with water.
- examples 4-6 the solutions were respectively prepared according to the examples 1-3. Unlike the examples 1-3, the stainless steel substrate of the samples was replaced with copper substrate. Except the above difference, the remaining experiment conditions of examples 4-6 were respectively same with examples 4-6.
- the samples processed in the examples 1-6 were inspected by X-ray diffraction (X-RD). No titanium was detected on the of samples. Accordingly, the coatings were effectively and completely removed from the underlying base. Furthermore, the processed samples were tested by scanning electronic microscopy (SEM). The scanning indicated no damage found to the underlying bases.
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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)
- ing And Chemical Polishing (AREA)
- Detergent Compositions (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
A solution and method for removing titanium-containing coatings from the surface of substrates using the solution are provided. The solution includes 90-1000 g/L organic or inorganic acid; 70-500 g/L accelerant, the accelerant being acid or salt which contains fluorinion; 15-200 g/L secondary accelerator, the secondary accelerator being generic amino alcohols which can combine with titanium ion; 2-8 g/L inhibiter, the inhibiter being selected from one or more of the group consisting of thiourea, thiourea derivatives, and carbamide. The method for removing titanium-containing coating on the substrate mainly includes contacting the substrate with the titanium-containing coating with the solution.
Description
- This application is one of the five related co-pending U.S. patent applications listed below. All listed applications have the same assignee. The disclosure of each of the listed applications is incorporated by reference into all the other listed applications.
-
Attorney Docket No. Title Inventors US 33408 ELECTROLYTE FOR REMOVING WEI HUANG TITANIUM-CONTAING COATS AND et al. REMOVING METHOD USING SAME US 33410 SOLUTION FOR REMOVING WEI HUANG TITANIUM-CONTAINING COATS AND REMOVING METHOD USING SAME et al. US 33411 SOLUTION FOR REMOVING WEI HUANG TITANIUM-CONTAINING COATINGS AND et al. METHOD FOR SAME US 33412 SOLUTION FOR ELECTROLYTICALLY WEI HUANG REMOVING CHROMIUM CARBIDE et al. COATING AND METHOD FOR SAME US 33413 SOLUTION SYSTEM FOR WEI HUANG ELECTROLYTICALLY REMOVING et al. TITANIUM CARBIDE COATING AND METHOD FOR SAME - 1. Technical field
- The present disclosure relates to a solution for removing titanium-containing coatings and a related method.
- 2. Description of related art
- Hard ceramic coatings, such as titanium nitride and titanium carbide, impart specific properties to workpieces such as machining tools, die core-pins, and high temperature devices. These hard coatings resist wear, abrasion, oxidation, and corrosion, and reduce susceptibility to chemical reactions on the workpieces to which they are applied. These coatings, however, can fail locally during use or manufacture.
- Often, when such coatings fail, the entire die or tool component is discarded even if the underlying substrate shows no damage, at considerable cost. For this reason, the ability to recycle the underlying substrate by removing a failed coating and replacing it with a new coating is economically preferable.
- Therefore, there is room for improvement within the art.
- The present disclosure relates to a solution and a related method for removing titanium-containing coatings formed on the surfaces of substrates. The titanium-containing coating may be titanium nitride coating, titanium carbide coating, or titanium carbonitride coating. The substrate may be metal or plastic. The metal may be ferric-based alloy, copper, or copper alloy.
- The solution may be an aqueous solution containing acid, accelerant, secondary accelerator, and inhibiter.
- The acid may be inorganic acid or organic acid providing hydrogen ions, such as sulphuric acid, acetic acid, citric acid, or lactic acid, or a combination thereof. In an exemplary embodiment, sulphuric acid can be selected. The concentration of the acid selected may be about 90-1000 g/L, and is in this exemplary embodiment it is about 90-750 g/L.
- The accelerant may speed dissolution of metallic ions of the titanium-containing coatings into the solution. The accelerant may be acid or salt which contains fluorinion. The accelerant may be hydrofluoric acid, ammonium bifluoride, sodium fluoride, potassium fluoride, sodium fluoborate, or zirconium sodium fluoride, or a combination thereof, and in this exemplary embodiment it is hydrofluoric acid and/or ammonium bifluoride. The concentration of the accelerant selected may be about 70-500 g/L and in this exemplary embodiment it is about 75-300 g/L.
- The secondary accelerator can diminish the surface tension of the solution, facilitate the dissolving of the coatings, and accelerate the penetration of the hydrogen ion. The secondary accelerator may be generic amino alcohols and can combine with titanium ion. For example, the secondary accelerator may be ethanolamine, diethanolamine, or triethanolamine, or a combination thereof, and in this exemplary embodiment it is triethavolamine. The concentration of the secondary accelerator selected may be about 15-200 g/L, and in this exemplary embodiment it is about 30-80 g/L.
- The inhibiter protects the substrate from being etched by the acid. The inhibiter may be thiourea, thiourea derivatives, or carbamide, or a combination thereof, and in this exemplary embodiment it is thiourea or thiourea derivatives. The concentration of the inhibiter selected may be about 2-8 g/L, and in this exemplary embodiment it is about 3-5 g/L.
- The solution may be prepared by dissolving the acid, accelerant, secondary accelerator, and inhibiter in water.
- The method for removing the titanium-containing coating formed on the substrate may include steps of providing the solution, and contacting the substrate combined with a titanium-containing coating to the solution. The coating can be effectively removed from the substrate and the underlying base is free from damage by the present method. The substrate may contact the solution by immersion or spraying. The solution may have a temperature of about 20-30° C. Contact time between the substrate and the solution may be 0.5-2 hours. After contact, the substrate may be rinsed with water and then dried.
- Experimental examples of the present disclosure are described as followings.
- 50ml sulphuric acid having a concentration of 98 wt % and 5 g thiourea was added into 500 ml deionized water. Then, 200 ml hydrofluoric acid having a concentration of 40 wt % and 50 ml triethanolamine having a concentration of 80 wt % were added into the water solution. The water solution was supplemented with deionized water to 1000 ml. The solution was formed and contained the sulphuric acid with a concentration of about 90.16 g/L; the hydrofluoric acid with a concentration of about 90.4 g/L; the triethanolamine with a concentration of about 40.8 g/L.
- Samples of stainless steel substrate were provided. The stainless steel substrate had a coating selected from one of the titanium nitride coating, titanium carbide coating, and titanium carbonitride coating. The coating had a thickness of about 2 μm. The samples were completely immersed in the solution for about 1.5 hours at a temperature of about 25° C. During this process, the coatings were removed. Then, the samples were taken out of the solution and were dried after being rinsed with water.
- 55 ml sulphuric acid having a concentration of 98 wt % and 5 g thiourea was added into 500 ml deionized water. Then, 175 ml hydrofluoric acid having a concentration of 40 wt % and 54 ml triethanolamine having a concentration of 80 wt % were added into the solution. The solution was supplemented with deionized water to 1000 ml. The solution was formed and contained the sulphuric acid with a concentration of about 99.18 g/L; the hydrofluoric acid with a concentration of about 79.11 g/L; the triethanolamine with a concentration of about 44.88 g/L.
- Samples of stainless steel substrate were provided. The stainless steel substrate had a titanium carbide coating. The coating had a thickness of about 1.5 μm. The samples were completely immersed in the solution for about 1 hour at a room temperature. During this process, the coating was removed. Then, the samples were taken out of the solution and were dried after being rinsed with water.
- 400 g ammonium bifluoride and 5 g thiourea was dissolved in 500 ml deionized water. Then, 400 ml acetic acid having a concentration of 36 wt % and 20 ml triethanolamine having a concentration of 80 wt % were added into the water solution. The solution was formed and contained the acetic acid with a concentration of about 90.16 g/L; the hydrofluoric acid with a concentration of about 145 g/L; the triethanolamine with a concentration of about 16.32 g/L.
- Samples of stainless steel substrate were provided. The stainless steel substrate had a titanium carbonitride coating. The coating had a thickness of about 2 μm. The samples were completely immersed in the solution for about 2 hours at a room temperature. During this process, the coating was removed. Then, the samples were taken out of the solution and were dried after being rinsed with water.
- In examples 4-6, the solutions were respectively prepared according to the examples 1-3. Unlike the examples 1-3, the stainless steel substrate of the samples was replaced with copper substrate. Except the above difference, the remaining experiment conditions of examples 4-6 were respectively same with examples 4-6.
- The samples processed in the examples 1-6 were inspected by X-ray diffraction (X-RD). No titanium was detected on the of samples. Accordingly, the coatings were effectively and completely removed from the underlying base. Furthermore, the processed samples were tested by scanning electronic microscopy (SEM). The scanning indicated no damage found to the underlying bases.
- It is to be understood, however, that even though numerous characteristics and advantages of the present embodiments have been set forth in the foregoing description, together with details of the structures and functions of the embodiments, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.
Claims (20)
1. An aqueous solution for removing titanium-containing coatings on substrate surface, comprising:
90-1000 g/L organic or inorganic acid;
70-500 g/L accelerant, the accelerant being an acid or salt containing fluorinion;
15-200 g/L secondary accelerator, the secondary accelerator being generic amino alcohols and can combine with titanium ion; and
2-8 g/L inhibiter, the inhibiter selected from one or more of the group consisting of thiourea, thiourea derivatives, and carbamide.
2. The aqueous solution as claimed in claim 1 , wherein the acid is selected from one or more of the group consisting of sulphuric acid, acetic acid, citric acid, and lactic acid.
3. The aqueous solution as claimed in claim 2 , wherein the acid is sulphuric acid or acetic acid.
4. The aqueous solution as claimed in claim 1 , wherein the concentration of the acid is about 90-750 g/L.
5. The aqueous solution as claimed in claim 1 , wherein the accelerant is selected from one or more of the group consisting of hydrofluoric acid, ammonium bifluoride, sodium fluoride, potassium fluoride, sodium fluoborate, and zirconium sodium fluoride.
6. The aqueous solution as claimed in claim 5 , wherein the accelerant is hydrofluoric acid and/or ammonium bifluoride.
7. The aqueous solution as claimed in claim 1 , wherein the concentration of the accelerant is about 75-300 g/L.
8. The aqueous solution as claimed in claim 1 , wherein the secondary accelerator is selected from one or more of the group consisting of ethanolamine, diethanolamine, and triethanolamine.
9. The aqueous solution as claimed in claim 1 , wherein the concentration of the secondary accelerator is about 30-80 g/L.
10. The aqueous solution as claimed in claim 1 , wherein the inhibiter is thiourea or thiourea derivatives.
11. The aqueous solution as claimed in claim 1 , wherein the concentration of the inhibiter is about 3-5g/L.
12. A method for removing titanium-containing coating on substrate, comprising:
providing an aqueous solution, the aqueous solution containing 90-1000 g/L organic or inorganic acid, 70-500 g/L accelerant, the accelerant being an acid or salt containing fluorinion, 15-200 g/L secondary accelerator, the secondary accelerator being generic amino alcohols and can combine with titanium ion, and 2-8 g/L inhibiter, the inhibiter being selected from one or more of the group consisting of thiourea, thiourea derivatives, and carbamide; and
contacting the substrate with the titanium-containing coating with the aqueous solution.
13. The method as claimed in claim 12 , wherein the acid is selected from one or more of the group consisting of sulphuric acid, acetic acid, citric acid, and lactic acid.
14. The method as claimed in claim 12 , wherein the accelerant is selected from one or more of the group consisting of hydrofluoric acid, ammonium bifluoride, sodium fluoride, potassium fluoride, sodium fluoborate, and zirconium sodium fluoride.
15. The method as claimed in claim 12 , wherein the secondary accelerator is selected from one or more of the group consisting of ethanolamine, diethanolamine, and triethanolamine.
16. The method as claimed in claim 12 , wherein the aqueous solution has a temperature of about 20-30° C., the contact time between the substrate and the aqueous solution is about 0.5-2 hours.
17. The method as claimed in claim 12 , wherein the substrate is made of metal or plastic.
18. The method as claimed in claim 17 , wherein the metal is one of the ferric-based alloy, copper, and copper alloy.
19. The method as claimed in claim 12 , wherein the titanium-containing coating is titanium nitride coating, titanium carbide coating, or titanium carbonitride coating.
20. The method as claimed in claim 12 , wherein the substrate contacts the aqueous solution by immersion or spraying.
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CN201010150010.5 | 2010-04-19 | ||
CN201010150010.5A CN102220133B (en) | 2010-04-19 | 2010-04-19 | Stripping solution of titanium carbide and/or titanium nitride film and stripping method |
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US20110253169A1 true US20110253169A1 (en) | 2011-10-20 |
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US12/974,200 Abandoned US20110253169A1 (en) | 2010-04-19 | 2010-12-21 | Solution for removing titanium-containing coatings and method for same |
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US20110257056A1 (en) * | 2010-04-20 | 2011-10-20 | Fih (Hong Kong) Limited | Solution for removing titanium-containing coatings and removing method using same |
CN103046052A (en) * | 2012-12-27 | 2013-04-17 | 广东山之风环保科技有限公司 | Environment-friendly decoating liquid for titanium-containing coatings and use method of environment-friendly decoating liquid |
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US20110257056A1 (en) * | 2010-04-20 | 2011-10-20 | Fih (Hong Kong) Limited | Solution for removing titanium-containing coatings and removing method using same |
CN103046052A (en) * | 2012-12-27 | 2013-04-17 | 广东山之风环保科技有限公司 | Environment-friendly decoating liquid for titanium-containing coatings and use method of environment-friendly decoating liquid |
Also Published As
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CN102220133B (en) | 2014-02-12 |
CN102220133A (en) | 2011-10-19 |
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