CN117364220A - Acidic electrolytic deplating agent for carbon steel chromium-containing coating and deplating method thereof - Google Patents
Acidic electrolytic deplating agent for carbon steel chromium-containing coating and deplating method thereof Download PDFInfo
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- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 73
- 229910000975 Carbon steel Inorganic materials 0.000 title claims abstract description 52
- 239000010962 carbon steel Substances 0.000 title claims abstract description 52
- 238000000576 coating method Methods 0.000 title claims abstract description 44
- 239000011248 coating agent Substances 0.000 title claims abstract description 43
- 230000002378 acidificating effect Effects 0.000 title claims abstract description 40
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 title claims abstract description 30
- 229910052804 chromium Inorganic materials 0.000 title claims abstract description 30
- 239000011651 chromium Substances 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000002738 chelating agent Substances 0.000 claims abstract description 9
- 150000007524 organic acids Chemical class 0.000 claims abstract 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 36
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 claims description 14
- 238000002156 mixing Methods 0.000 claims description 14
- 229910001220 stainless steel Inorganic materials 0.000 claims description 14
- 239000010935 stainless steel Substances 0.000 claims description 14
- 235000015165 citric acid Nutrition 0.000 claims description 12
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims description 11
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims description 11
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims description 11
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 claims description 9
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 claims description 9
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 claims description 9
- 239000011976 maleic acid Substances 0.000 claims description 9
- 239000011975 tartaric acid Substances 0.000 claims description 9
- 235000002906 tartaric acid Nutrition 0.000 claims description 9
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 claims description 9
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 7
- 238000005868 electrolysis reaction Methods 0.000 claims description 7
- 239000004310 lactic acid Substances 0.000 claims description 7
- 235000014655 lactic acid Nutrition 0.000 claims description 7
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 7
- RGHNJXZEOKUKBD-SQOUGZDYSA-N D-gluconic acid Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C(O)=O RGHNJXZEOKUKBD-SQOUGZDYSA-N 0.000 claims description 6
- AEMRFAOFKBGASW-UHFFFAOYSA-N Glycolic acid Chemical compound OCC(O)=O AEMRFAOFKBGASW-UHFFFAOYSA-N 0.000 claims description 6
- BJEPYKJPYRNKOW-REOHCLBHSA-N (S)-malic acid Chemical compound OC(=O)[C@@H](O)CC(O)=O BJEPYKJPYRNKOW-REOHCLBHSA-N 0.000 claims description 5
- BJEPYKJPYRNKOW-UHFFFAOYSA-N alpha-hydroxysuccinic acid Natural products OC(=O)C(O)CC(O)=O BJEPYKJPYRNKOW-UHFFFAOYSA-N 0.000 claims description 5
- 239000001630 malic acid Substances 0.000 claims description 5
- 235000011090 malic acid Nutrition 0.000 claims description 5
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 claims description 4
- RGHNJXZEOKUKBD-UHFFFAOYSA-N D-gluconic acid Natural products OCC(O)C(O)C(O)C(O)C(O)=O RGHNJXZEOKUKBD-UHFFFAOYSA-N 0.000 claims description 4
- 239000000174 gluconic acid Substances 0.000 claims description 4
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- 238000004519 manufacturing process Methods 0.000 claims description 4
- 229920000609 methyl cellulose Polymers 0.000 claims description 4
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- 229920002401 polyacrylamide Polymers 0.000 claims description 4
- 239000004034 viscosity adjusting agent Substances 0.000 claims description 4
- 229920003169 water-soluble polymer Polymers 0.000 claims description 4
- LNAZSHAWQACDHT-XIYTZBAFSA-N (2r,3r,4s,5r,6s)-4,5-dimethoxy-2-(methoxymethyl)-3-[(2s,3r,4s,5r,6r)-3,4,5-trimethoxy-6-(methoxymethyl)oxan-2-yl]oxy-6-[(2r,3r,4s,5r,6r)-4,5,6-trimethoxy-2-(methoxymethyl)oxan-3-yl]oxyoxane Chemical compound CO[C@@H]1[C@@H](OC)[C@H](OC)[C@@H](COC)O[C@H]1O[C@H]1[C@H](OC)[C@@H](OC)[C@H](O[C@H]2[C@@H]([C@@H](OC)[C@H](OC)O[C@@H]2COC)OC)O[C@@H]1COC LNAZSHAWQACDHT-XIYTZBAFSA-N 0.000 claims description 2
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 2
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 claims description 2
- 239000001856 Ethyl cellulose Substances 0.000 claims description 2
- ZZSNKZQZMQGXPY-UHFFFAOYSA-N Ethyl cellulose Chemical compound CCOCC1OC(OC)C(OCC)C(OCC)C1OC1C(O)C(O)C(OC)C(CO)O1 ZZSNKZQZMQGXPY-UHFFFAOYSA-N 0.000 claims description 2
- 229920001479 Hydroxyethyl methyl cellulose Polymers 0.000 claims description 2
- 239000002202 Polyethylene glycol Substances 0.000 claims description 2
- 235000010323 ascorbic acid Nutrition 0.000 claims description 2
- 239000011668 ascorbic acid Substances 0.000 claims description 2
- 229960005070 ascorbic acid Drugs 0.000 claims description 2
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 2
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims description 2
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims description 2
- 229920003087 methylethyl cellulose Polymers 0.000 claims description 2
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 claims description 2
- 229920001223 polyethylene glycol Polymers 0.000 claims description 2
- 235000019422 polyvinyl alcohol Nutrition 0.000 claims description 2
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 claims description 2
- 235000010944 ethyl methyl cellulose Nutrition 0.000 claims 1
- 230000007797 corrosion Effects 0.000 abstract description 24
- 238000005260 corrosion Methods 0.000 abstract description 24
- 239000002253 acid Substances 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 10
- VKYKSIONXSXAKP-UHFFFAOYSA-N hexamethylenetetramine Chemical compound C1N(C2)CN3CN1CN2C3 VKYKSIONXSXAKP-UHFFFAOYSA-N 0.000 abstract description 10
- 239000000758 substrate Substances 0.000 abstract description 9
- 229910002651 NO3 Inorganic materials 0.000 abstract description 7
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 abstract description 7
- 239000003513 alkali Substances 0.000 abstract description 7
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 abstract description 6
- 229910052736 halogen Inorganic materials 0.000 abstract description 5
- 150000002367 halogens Chemical class 0.000 abstract description 5
- 239000004312 hexamethylene tetramine Substances 0.000 abstract description 5
- 235000010299 hexamethylene tetramine Nutrition 0.000 abstract description 5
- 238000009776 industrial production Methods 0.000 abstract description 4
- 239000003153 chemical reaction reagent Substances 0.000 abstract description 3
- 238000002360 preparation method Methods 0.000 abstract description 2
- 238000012216 screening Methods 0.000 abstract description 2
- 230000002195 synergetic effect Effects 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 14
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 9
- 238000007747 plating Methods 0.000 description 8
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 6
- 238000005240 physical vapour deposition Methods 0.000 description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 231100000331 toxic Toxicity 0.000 description 3
- 230000002588 toxic effect Effects 0.000 description 3
- 229910000851 Alloy steel Inorganic materials 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 239000002360 explosive Substances 0.000 description 2
- LELOWRISYMNNSU-UHFFFAOYSA-N hydrogen cyanide Chemical compound N#C LELOWRISYMNNSU-UHFFFAOYSA-N 0.000 description 2
- 239000007800 oxidant agent Substances 0.000 description 2
- -1 potassium ferricyanide Chemical compound 0.000 description 2
- 239000012286 potassium permanganate Substances 0.000 description 2
- AWFYPPSBLUWMFQ-UHFFFAOYSA-N 2-[5-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]-1,3,4-oxadiazol-2-yl]-1-(1,4,6,7-tetrahydropyrazolo[4,3-c]pyridin-5-yl)ethanone Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C1=NN=C(O1)CC(=O)N1CC2=C(CC1)NN=C2 AWFYPPSBLUWMFQ-UHFFFAOYSA-N 0.000 description 1
- DEXFNLNNUZKHNO-UHFFFAOYSA-N 6-[3-[4-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]piperidin-1-yl]-3-oxopropyl]-3H-1,3-benzoxazol-2-one Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C1CCN(CC1)C(CCC1=CC2=C(NC(O2)=O)C=C1)=O DEXFNLNNUZKHNO-UHFFFAOYSA-N 0.000 description 1
- 229910001339 C alloy Inorganic materials 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 241001062472 Stokellia anisodon Species 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000009920 chelation Effects 0.000 description 1
- 238000001311 chemical methods and process Methods 0.000 description 1
- 229910001430 chromium ion Inorganic materials 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 235000019325 ethyl cellulose Nutrition 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- QMQXDJATSGGYDR-UHFFFAOYSA-N methylidyneiron Chemical compound [C].[Fe] QMQXDJATSGGYDR-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000011550 stock solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F5/00—Electrolytic stripping of metallic layers or coatings
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention belongs to the technical field of electrolytic stripping, and discloses an acidic electrolytic stripping agent for a carbon steel chromium-containing coating and a stripping method thereof. The acidic electrolytic stripping agent comprises the following components in percentage by mass: 5-10% of organic acid, 8-15% of chelating agent, 5-10% of viscosity regulator and the balance of water. The acidic electrolytic stripping agent of the invention adopts the efficient combination of organic acid, chelating agent, viscosity regulator and water through reasonable screening of the components, effectively combines the components together, is a complete whole, and obtains excellent comprehensive performance through the synergistic effect of the components. The stripping agent has excellent stripping effect, short stripping time, clean stripping, long service life, capability of stripping at room temperature, safety to carbon steel substrates, no corrosion to the substrates, no reagents such as inorganic strong acid and alkali, nitrate, cyanide, hexamethylenetetramine, halogen and the like, simple components, easy preparation and suitability for industrial production.
Description
Technical Field
The invention belongs to the technical field of electrolytic stripping, and particularly relates to an acidic electrolytic stripping agent for a carbon steel chromium-containing coating and a stripping method thereof.
Background
Carbon steel is an iron-carbon alloy containing carbon in the mass fraction of 0.0218-2.11% and small amount of Mn, si, P, S, etc. In steel materials, carbon steel has a large specific gravity, and compared with alloy steel, carbon steel is simple to smelt, easy to process and low in cost, and can meet the use requirements under the general condition, so that the alloy steel is widely applied to industries such as machinery, building, traffic and the like. The carbon steel has higher carbon content, lower alloy content and lower self corrosion resistance, and the corrosion resistance can be effectively improved and the service life can be greatly prolonged by preparing the corrosion resistant coating on the surface of the carbon steel through the physical vapor deposition method (Physical Vapor Deposition, PVD) firstly for plating chromium and then for plating a color layer. However, the PVD treatment is inevitably defective and cannot be repaired, and the bad coating needs to be removed and PVD is resumed.
Currently, the method for removing PVD coating on carbon steel surface mainly comprises chemical method and electrolytic method. The chemical process is typically deplating with a strong oxidizing agent such as potassium permanganate, potassium ferricyanide or hydrochloric acid. Wherein, the strong oxidant is easy to decompose and lose efficacy, has short retention period, and has extremely high potassium permanganate chromaticity and high wastewater treatment cost; the potassium ferricyanide mixed with acid can produce highly toxic hydrogen cyanide; hydrochloric acid is extremely volatile, causing pollution to the surrounding air. The electrolytic method generally adopts inorganic strong acid and alkali (nitric acid, sulfuric acid, phosphoric acid, hydrochloric acid, sodium hydroxide, potassium hydroxide and the like), nitrate, cyanide, hydrogen peroxide and the like for deplating, the problem of serious corrosion to a carbon steel substrate exists in the inorganic strong acid deplating process, the problem of slow deplating speed exists in the inorganic strong alkali, nitrogen oxides can be generated in the nitrate deplating process, and the wastewater generated by the substances has large treatment difficulty and high treatment cost.
In order to meet the requirement of environment-friendly safe production and further improve the stripping effect and efficiency, a more friendly carbon steel electrolytic stripping agent is needed to solve the problems.
Disclosure of Invention
In order to overcome the defects and shortcomings of the prior art, the invention aims at providing an acidic electrolytic stripping agent for a carbon steel chromium-containing coating.
The acidic electrolytic stripping agent has excellent stripping effect on the chromium-containing plating layer of the carbon steel, and has high stripping speed; the stripping agent has long service life, does not contain reagents such as inorganic strong acid, alkali, nitrate, cyanide, hexamethylenetetramine, halogen and the like, can not corrode a carbon steel substrate in the stripping process, is simple to prepare, and is suitable for industrial production.
Another object of the present invention is to provide a stripping method of an acidic electrolytic stripping agent based on the chromium-containing carbon steel coating.
The acidic electrolytic stripping agent is used as electrolyte, and the workpiece to be stripped is immersed in the acidic electrolytic stripping agent at room temperature to perform electrolytic stripping, so that the process condition is mild, the stripping speed is high, and the stripping effect is good.
The aim of the invention is achieved by the following scheme:
an acidic electrolytic stripping agent for a carbon steel chromium-containing coating comprises the following components in percentage by mass: 5-10% of organic acid, 8-15% of chelating agent, 5-10% of viscosity regulator and the balance of water.
Further, the organic acid includes at least one of malic acid, ascorbic acid, maleic acid, lactic acid, glycolic acid, and the like.
Further, the chelating agent comprises at least one of citric acid, gluconic acid, tartaric acid and the like.
Further, the viscosity modifier is a water-soluble polymer. The weight average molecular weight of the water-soluble polymer may be 1000 to 5000.
Still further, the viscosity modifier may include at least one of polyvinylpyrrolidone, sodium polyacrylate, polyethylene glycol, polyacrylamide, polyvinyl alcohol, carboxymethyl cellulose, methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, and the like.
The acid electrolytic stripping agent for the carbon steel chromium-containing coating can be obtained by uniformly mixing the components according to the proportion.
The invention effectively combines the components together, is a complete whole, and obtains excellent comprehensive performance through the synergistic effect of the components, so that the stripping agent has excellent stripping effect, high stripping speed and long service life, can be used for stripping at room temperature, does not contain reagents such as inorganic strong acid, strong alkali, nitrate, cyanide, hexamethylenetetramine, halogen and the like, does not corrode a substrate, has simple components, is easy to prepare, and is suitable for industrial production.
The invention also provides a stripping method of the acidic electrolytic stripping agent based on the carbon steel chromium-containing coating, which can comprise the following steps: and (3) taking the workpiece to be deplated as an anode, taking the stainless steel plate/lead plate as a cathode, and placing the workpiece to be deplated in the electrolytic deplating agent for electrolytic deplating.
Preferably, the current density of the electrolysis may be 1-5A/dm 2 。
Preferably, the electrolysis time may be 5 to 20 minutes. The acidic electrolytic stripping agent of the carbon steel chromium-containing plating layer is used as electrolyte,
preferably, the temperature of the electrolysis is room temperature.
Further, when the stripping solution in the electrolytic tank is reduced along with the carrying away of the workpiece, the stripping agent stock solution is directly added.
Compared with the prior art, the invention has the following advantages:
(1) The acidic electrolytic stripping agent for the carbon steel chromium-containing coating adopts the efficient compounding of organic acid, chelating agent, viscosity regulator and water through reasonable screening of each component, has simple components and easy preparation, and is suitable for industrial production. Wherein, the organic acid adjusts conductivity, controls the effect of chromium-containing plating electrolytic reaction rate, and the chelating agent has the chelation to the chromium ion that peels off from the substrate surface, avoids the plating surface to form insoluble matter, suppresses the effect of anodic polarization, and viscosity modifier plays the effect of promoting electrolytic reaction evenly to go on, avoids substrate surface current density inhomogeneous, leads to the substrate to appear pit, fog etc. corruption.
(2) The acidic electrolytic deplating agent for the carbon steel chromium-containing coating has short deplating time, clean deplating, deplating at room temperature, safety to carbon steel substrates and long service life.
(3) The acidic electrolytic stripping agent disclosed by the invention does not contain toxic, harmful, inflammable and explosive substances such as inorganic strong acid and alkali, nitrate, cyanide, hexamethylenetetramine, halogen and the like, and meets the requirements of environment-friendly safe production.
Detailed Description
The present invention will be described in further detail with reference to examples, but embodiments of the present invention are not limited thereto. The materials referred to in the examples below are available commercially unless otherwise specified. The method is conventional unless otherwise specified.
Example 1
An acidic electrolytic stripping agent for a carbon steel chromium-containing coating comprises the following components in percentage by mass: malic acid 5%, gluconic acid 8%, methyl cellulose (weight average molecular weight 1000-3000) 7%, and water in balance.
Will be put onThe electrolytic stripping agent is obtained by uniformly mixing the components. Placing a workpiece to be deplated serving as an anode and a stainless steel plate serving as a cathode in the electrolytic deplating agent, and setting the electrolytic current to be 5A/dm at room temperature 2 Electrolytic stripping for 18min, stripping, and carbon steel corrosion-free, and the results are shown in Table 1.
Example 2
An acidic electrolytic stripping agent for a carbon steel chromium-containing coating comprises the following components in percentage by mass: 5% of malic acid, 2% of maleic acid, 10% of citric acid, 5% of polyvinylpyrrolidone (weight average molecular weight is 3000-5000) and the balance of water.
And uniformly mixing the components to obtain the electrolytic stripping agent. Placing a workpiece to be deplated serving as an anode and a stainless steel plate serving as a cathode in the electrolytic deplating agent, and setting the electrolytic current to be 5A/dm at room temperature 2 Electrolytic stripping for 10min, stripping, and carbon steel corrosion-free, and the results are shown in Table 1.
Example 3
An acidic electrolytic stripping agent for a carbon steel chromium-containing coating comprises the following components in percentage by mass: lactic acid 5%, maleic acid 5%, citric acid 5%, tartaric acid 10%, polyvinylpyrrolidone (weight average molecular weight 1000-2000) 5%, polyacrylamide (weight average molecular weight 1000-3000) 5%, and water in balance.
And uniformly mixing the components to obtain the electrolytic stripping agent. Placing a workpiece to be deplated serving as an anode and a stainless steel plate serving as a cathode in the electrolytic deplating agent, and setting the electrolytic current to be 5A/dm at room temperature 2 Electrolytic stripping for 5min, stripping, and carbon steel corrosion-free, and the results are shown in Table 1.
Example 4
An acidic electrolytic stripping agent for a carbon steel chromium-containing coating comprises the following components in percentage by mass: 5% of glycolic acid, 5% of maleic acid, 8% of citric acid, 5% of polyvinylpyrrolidone (weight average molecular weight is 1000-2000), 3% of polyacrylamide (weight average molecular weight is 1000-3000) and the balance of water.
And uniformly mixing the components to obtain the electrolytic stripping agent. The workpiece to be deplated is taken as an anode, a stainless steel plate is taken as a cathode, and the workpiece to be deplated is placed in the electrolytic deplating agent, and the chamberSetting the electrolysis current at 5A/dm under the temperature condition 2 Electrolytic stripping for 10min, stripping, and carbon steel corrosion-free, and the results are shown in Table 1.
Example 5
An acidic electrolytic stripping agent for a carbon steel chromium-containing coating comprises the following components in percentage by mass: lactic acid 5%, maleic acid 5%, citric acid 5%, tartaric acid 10%, polyvinylpyrrolidone (weight average molecular weight 1000-2000) 5%, polyvinyl alcohol (weight average molecular weight 1000-3000) 5%, and water in balance.
And uniformly mixing the components to obtain the electrolytic stripping agent. The workpiece to be deplated is taken as an anode, a stainless steel plate is taken as a cathode, and is placed in the electrolytic deplating agent, and the electrolytic current is set to be 1A/dm under the room temperature condition 2 Electrolytic stripping for 15min, stripping, and carbon steel corrosion-free, and the results are shown in Table 1.
Comparative example 1
An acidic electrolytic stripping agent for a carbon steel chromium-containing coating comprises the following components in percentage by mass: lactic acid 5%, maleic acid 5%, citric acid 5%, tartaric acid 10%, polyvinylpyrrolidone (weight average molecular weight 1000-2000) 4%, and the balance water.
And uniformly mixing the components to obtain the electrolytic stripping agent. The workpiece to be deplated is taken as an anode, a stainless steel plate is taken as a cathode, and is placed in the electrolytic deplating agent, and the electrolytic current is set to be 1A/dm under the room temperature condition 2 Electrolytic stripping for 15min, stripping, pit corrosion of carbon steel, and the results are shown in Table 1.
Comparative example 2
An acidic electrolytic stripping agent for a carbon steel chromium-containing coating comprises the following components in percentage by mass: lactic acid 5%, maleic acid 5%, citric acid 15%, tartaric acid 10%, polyvinylpyrrolidone (weight average molecular weight 1000-2000) 5%, polyvinyl alcohol (weight average molecular weight 1000-3000) 5%, and water in balance.
And uniformly mixing the components to obtain the electrolytic stripping agent. Placing a workpiece to be deplated serving as an anode and a stainless steel plate serving as a cathode in the electrolytic deplating agent, and setting the electrolytic current to be 5A/dm at room temperature 2 Observing the deplating of the plating layer, namely stopping electrolysis, and electrolyzing the deplating timeAbout 5 minutes, no corrosion of carbon steel, results are shown in Table 1.
Comparative example 3
An acidic electrolytic stripping agent for a carbon steel chromium-containing coating comprises the following components in percentage by mass: malic acid 3%, gluconic acid 8%, methyl cellulose (weight average molecular weight 1000-3000) 7%, and water in balance.
And uniformly mixing the components to obtain the electrolytic stripping agent. Placing a workpiece to be deplated serving as an anode and a stainless steel plate serving as a cathode in the electrolytic deplating agent, and setting the electrolytic current to be 5A/dm at room temperature 2 Electrolytic stripping for 18min, undeveloped coating, no corrosion of carbon steel, and the results are shown in Table 1.
Comparative example 4
An acidic electrolytic stripping agent for a carbon steel chromium-containing coating comprises the following components in percentage by mass: lactic acid 5%, maleic acid 5%, citric acid 5%, tartaric acid 10%, polyvinylpyrrolidone (weight average molecular weight 1000-2000) 5%, polyvinyl alcohol (weight average molecular weight 1000-3000) 15%, and water in balance.
And uniformly mixing the components to obtain the electrolytic stripping agent. The workpiece to be deplated is taken as an anode, a stainless steel plate is taken as a cathode, and is placed in the electrolytic deplating agent, and the electrolytic current is set to be 1A/dm under the room temperature condition 2 Electrolytic stripping for 15min, undeveloped coating, no corrosion of carbon steel and the results are shown in Table 1.
Comparative example 5
An acidic electrolytic stripping agent for a carbon steel chromium-containing coating comprises the following components in percentage by mass: 15% of sodium hydroxide, 5% of citric acid, 10% of tartaric acid, 5% of polyvinylpyrrolidone (weight average molecular weight is 1000-2000), 5% of polyvinyl alcohol (weight average molecular weight is 1000-3000) and the balance of water.
And uniformly mixing the components to obtain the electrolytic stripping agent. Placing a workpiece to be deplated serving as an anode and a stainless steel plate serving as a cathode in the electrolytic deplating agent, and setting the electrolytic current to be 5A/dm at room temperature 2 Electrolytic stripping for 60min, undeveloped coating, no corrosion of carbon steel and the results are shown in Table 1.
Comparative example 6
An acidic electrolytic stripping agent for a carbon steel chromium-containing coating comprises the following components in percentage by mass: 98% sulfuric acid 5%, citric acid 5%, tartaric acid 10%, polyvinylpyrrolidone (weight average molecular weight 1000-2000) 5%, polyvinyl alcohol (weight average molecular weight 1000-3000) 5%, and water in balance.
And uniformly mixing the components to obtain the electrolytic stripping agent. Placing a workpiece to be deplated serving as an anode and a stainless steel plate serving as a cathode in the electrolytic deplating agent, and setting the electrolytic current to be 5A/dm at room temperature 2 Electrolytic stripping for 10min, undeveloped coating, pit pitting corrosion of carbon steel, and the results are shown in Table 1.
Comparative example 7
An acidic electrolytic stripping agent for a carbon steel chromium-containing coating comprises the following components in percentage by mass: 15% of sodium hydroxide, 5% of citric acid and the balance of water.
And uniformly mixing the components to obtain the electrolytic stripping agent. The workpiece to be deplated is taken as an anode, a stainless steel plate is taken as a cathode, and is placed in the electrolytic deplating agent, and the electrolytic current is set to be 5A/dm at the temperature of 80-85 DEG C 2 Electrolytic stripping for 40min, stripping, and carbon steel corrosion-free, and the results are shown in Table 1.
TABLE 1 stripping Effect of acid electrolytic stripping Agents for chromium-containing carbon Steel coatings
| Deplating time/min | Stripping effect | Surface corrosion conditions (pitting or pitting) | |
| Example 1 | 18 | Coating stripping | No corrosion |
| Example 2 | 10 | Coating stripping | No corrosion |
| Example 3 | 5 | Coating stripping | No corrosion |
| Example 4 | 10 | Coating stripping | No corrosion |
| Example 5 | 15 | Coating stripping | No corrosion |
| Comparative example 1 | 15 | Coating stripping | Pit pitting corrosion |
| Comparative example 2 | 5 | Coating stripping | No corrosion |
| Comparative example 3 | 18 | The coating is not removed | No corrosion |
| Comparative example 4 | 15 | The coating is not removed | No corrosion |
| Comparative example 5 | 60 | The coating is not removed | No corrosion |
| Comparative example 6 | 10 | Coating stripping | Pit pitting corrosion |
| Comparative example 7 | 40 | Coating stripping | No corrosion |
As can be seen from Table 1, the acidic electrolytic stripping agent for the chromium-containing carbon steel plating layer adopts the efficient combination of organic acid, chelating agent, viscosity regulator and water, and has the advantages of short stripping time, clean stripping, room-temperature stripping, safety to carbon steel base materials in the stripping process and long service life. The electrolytic stripping agent disclosed by the invention does not contain toxic, harmful, inflammable and explosive substances such as inorganic strong acid and alkali, nitrate, cyanide, hexamethylenetetramine, halogen and the like, and meets the requirements of environment-friendly and safe production.
The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present invention should be made in the equivalent manner, and the embodiments are included in the protection scope of the present invention.
Claims (10)
1. The acidic electrolytic stripping agent for the carbon steel chromium-containing coating is characterized by comprising the following components in percentage by mass: 5-10% of organic acid, 8-15% of chelating agent, 5-10% of viscosity regulator and the balance of water.
2. The acidic electrolytic stripping agent according to claim 1, characterized in that: the organic acid comprises at least one of malic acid, ascorbic acid, maleic acid, lactic acid and glycolic acid.
3. The acidic electrolytic stripping agent according to claim 1, characterized in that: the chelating agent comprises at least one of citric acid, gluconic acid and tartaric acid.
4. The acidic electrolytic stripping agent according to claim 1, characterized in that: the viscosity regulator is a water-soluble polymer.
5. The acidic electrolytic stripping agent according to claim 4, characterized in that: the weight average molecular weight of the water-soluble polymer is 1000-5000.
6. The acidic electrolytic stripping agent according to claim 1, characterized in that: the viscosity modifier comprises at least one of polyvinylpyrrolidone, sodium polyacrylate, polyethylene glycol, polyacrylamide, polyvinyl alcohol, carboxymethyl cellulose, methyl cellulose, ethyl cellulose and hydroxyethyl cellulose.
7. A process for preparing the acidic electrolytic stripping agent according to any one of claims 1-6, characterized in that: and uniformly mixing the components in proportion to obtain the acidic electrolytic stripping agent.
8. A stripping method based on the acidic electrolytic stripping agent according to any one of claims 1-6, characterized by comprising the steps of: electrolytic stripping is carried out with the workpiece to be stripped as an anode and the stainless steel/lead plate as a cathode in an acidic electrolytic stripping agent as claimed in any one of claims 1 to 6.
9. The stripping method as claimed in claim 8, wherein: the current density of the electrolysis is 1-5A/dm 2 。
10. The stripping method as claimed in claim 8, wherein: the electrolysis time is 5-20min.
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