CN115261860B - Aluminum alloy surface corrosion scavenger and preparation method and application thereof - Google Patents
Aluminum alloy surface corrosion scavenger and preparation method and application thereof Download PDFInfo
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- CN115261860B CN115261860B CN202210659292.4A CN202210659292A CN115261860B CN 115261860 B CN115261860 B CN 115261860B CN 202210659292 A CN202210659292 A CN 202210659292A CN 115261860 B CN115261860 B CN 115261860B
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- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 128
- 239000002516 radical scavenger Substances 0.000 title claims abstract description 89
- 230000007797 corrosion Effects 0.000 title claims abstract description 84
- 238000005260 corrosion Methods 0.000 title claims abstract description 84
- 238000002360 preparation method Methods 0.000 title claims abstract description 33
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims abstract description 48
- 239000007800 oxidant agent Substances 0.000 claims abstract description 48
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims abstract description 40
- 229910017604 nitric acid Inorganic materials 0.000 claims abstract description 40
- 239000002253 acid Substances 0.000 claims abstract description 33
- 230000001590 oxidative effect Effects 0.000 claims abstract description 27
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims abstract description 24
- 239000003112 inhibitor Substances 0.000 claims abstract description 22
- 239000004094 surface-active agent Substances 0.000 claims abstract description 22
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 21
- 230000000149 penetrating effect Effects 0.000 claims abstract description 20
- 238000010438 heat treatment Methods 0.000 claims abstract description 17
- 238000003756 stirring Methods 0.000 claims description 32
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical group [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 17
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 16
- 229920000297 Rayon Polymers 0.000 claims description 15
- 230000002378 acidificating effect Effects 0.000 claims description 14
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims description 11
- VKYKSIONXSXAKP-UHFFFAOYSA-N hexamethylenetetramine Chemical group C1N(C2)CN3CN1CN2C3 VKYKSIONXSXAKP-UHFFFAOYSA-N 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 7
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 7
- 229920000056 polyoxyethylene ether Polymers 0.000 claims description 7
- 230000009969 flowable effect Effects 0.000 claims description 6
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical group [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims description 5
- 239000004312 hexamethylene tetramine Substances 0.000 claims description 5
- 235000010299 hexamethylene tetramine Nutrition 0.000 claims description 5
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims description 5
- 235000021355 Stearic acid Nutrition 0.000 claims description 4
- -1 benzene propyl triazole Chemical compound 0.000 claims description 4
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 4
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims description 4
- 239000008117 stearic acid Substances 0.000 claims description 4
- 125000000373 fatty alcohol group Chemical group 0.000 claims description 2
- 239000003518 caustics Substances 0.000 abstract description 22
- 238000000354 decomposition reaction Methods 0.000 abstract description 12
- 230000002000 scavenging effect Effects 0.000 abstract description 12
- 230000002035 prolonged effect Effects 0.000 abstract description 4
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 239000011248 coating agent Substances 0.000 description 47
- 238000000576 coating method Methods 0.000 description 47
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 26
- 230000000052 comparative effect Effects 0.000 description 23
- 230000000694 effects Effects 0.000 description 20
- VAZSKTXWXKYQJF-UHFFFAOYSA-N ammonium persulfate Chemical group [NH4+].[NH4+].[O-]S(=O)OOS([O-])=O VAZSKTXWXKYQJF-UHFFFAOYSA-N 0.000 description 15
- 238000004140 cleaning Methods 0.000 description 12
- 239000007787 solid Substances 0.000 description 11
- 239000012459 cleaning agent Substances 0.000 description 10
- 231100001010 corrosive Toxicity 0.000 description 10
- 239000002932 luster Substances 0.000 description 10
- 238000000034 method Methods 0.000 description 9
- 150000003254 radicals Chemical class 0.000 description 8
- 239000010410 layer Substances 0.000 description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 6
- 239000003595 mist Substances 0.000 description 6
- 150000002191 fatty alcohols Chemical class 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- 230000036541 health Effects 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- 150000007513 acids Chemical class 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000005764 inhibitory process Effects 0.000 description 3
- 238000010297 mechanical methods and process Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000008439 repair process Effects 0.000 description 3
- 229910002706 AlOOH Inorganic materials 0.000 description 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 2
- QRUDEWIWKLJBPS-UHFFFAOYSA-N benzotriazole Chemical compound C1=CC=C2N[N][N]C2=C1 QRUDEWIWKLJBPS-UHFFFAOYSA-N 0.000 description 2
- 239000012964 benzotriazole Substances 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-M hydrogensulfate Chemical compound OS([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-M 0.000 description 2
- 238000006460 hydrolysis reaction Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001603 reducing effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 230000009974 thixotropic effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000003562 lightweight material Substances 0.000 description 1
- 231100000053 low toxicity Toxicity 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 150000007522 mineralic acids Chemical class 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- YPJKMVATUPSWOH-UHFFFAOYSA-N nitrooxidanyl Chemical compound [O][N+]([O-])=O YPJKMVATUPSWOH-UHFFFAOYSA-N 0.000 description 1
- 230000033116 oxidation-reduction process Effects 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 125000005385 peroxodisulfate group Chemical group 0.000 description 1
- JRKICGRDRMAZLK-UHFFFAOYSA-L peroxydisulfate Chemical compound [O-]S(=O)(=O)OOS([O-])(=O)=O JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000009419 refurbishment Methods 0.000 description 1
- 150000003839 salts Chemical class 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
- C23G1/12—Light metals
- C23G1/125—Light metals aluminium
-
- 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
- C23G1/04—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors
- C23G1/06—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors organic inhibitors
- C23G1/061—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors organic inhibitors nitrogen-containing compounds
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)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The application provides an aluminum alloy surface corrosion remover, a preparation method and application thereof, wherein the remover comprises the following components in parts by mass: 50 to 70 parts of acid gel, 10 to 20 parts of strong oxidizer, 15 to 35 parts of phosphoric acid, 0.3 to 4 parts of nitric acid, 0.01 to 2 parts of surfactant, 0.01 to 4 parts of penetrating agent and 0.01 to 4 parts of corrosion inhibitor. According to the aluminum alloy surface corrosion remover and the preparation method and application thereof, as the nitric acid is added, the decomposition of the strong oxidant can be effectively inhibited, the storage time of the remover is prolonged, the aluminum alloy surface corrosion remover can be stably stored for a long time, the storage time can be more than 180 days, the remover can be prepared without heating, the preparation process is simple, and the energy consumption is reduced; the scavenger is coated on the surface of the aluminum alloy to be scavenged, so that corrosive substances on the surface of the aluminum alloy can be scavenged rapidly, the operation is simple, and the corrosive substances scavenging effect is good.
Description
Technical Field
The application relates to the technical field of aluminum alloy equipment maintenance, in particular to an aluminum alloy surface corrosion remover, a preparation method and application thereof.
Background
Equipment deployed in coastal areas is exposed to severe environments of high temperature, high humidity, high salt mist, and strong ultraviolet rays for a long period of time, and the corrosion degree is more serious than that of equipment typically deployed on land. Al is first naturally formed by Al and Al alloy in the atmosphere at room temperature 2 O 3 Film, al 2 O 3 The film forms a thin layer of AlOOH after being exposed for several months or under extreme environmental influence, and a layer of Al (OH) is covered outside the thin layer of AlOOH after a period of time 3 . Thus, when aluminum alloy equipment is exposed to a humid environment for a long period of time, water, condensation and water vapor are very likely to enter exposed metal surfaces and unsealed rivet joints, causing severe corrosion of the equipment surfaces.
Existing corrosion removers are commonly used to remove iron and corrosion on steel surfaces. However, in recent years, as the field of light weight materials is receiving more and more attention, aluminum alloy products have been widely used in various fields instead of most iron and steel products. The corrosion removal agents used for the aluminum alloy and the steel are different due to the different corrosion mechanisms of the aluminum alloy and the steel. At present, the aluminum alloy is mostly removed by adopting a mechanical method or dissolved by adopting strong acid, and strong acid mist can be generated when the method is used for removing corrosives on the surface of the aluminum alloy, so that the health of operators is influenced. And is not suitable for equipment without major repair or refurbishment conditions.
Disclosure of Invention
In view of the above, the present application aims to provide an aluminum alloy surface corrosion remover, and a preparation method and application thereof.
In view of the above, a first aspect of the present application provides an aluminum alloy surface corrosion remover comprising: the coating comprises the following components in parts by weight: 50 to 70 parts of acid gel, 10 to 20 parts of strong oxidizer, 15 to 35 parts of phosphoric acid, 0.3 to 4 parts of nitric acid, 0.01 to 2 parts of surfactant, 0.01 to 4 parts of penetrant and 0.01 to 4 parts of corrosion inhibitor
Further, the scavenger comprises: the coating comprises the following components in parts by weight: 55-60 parts of acid gel, 12-15 parts of strong oxidant, 20-30 parts of phosphoric acid, 0.5-2 parts of nitric acid, 0.1-1 part of surfactant, 0.1-2 parts of penetrating agent and 0.1-2 parts of corrosion inhibitor.
Further, the scavenger comprises: the coating comprises the following components in parts by weight: 58 parts of acid gel, 14 parts of strong oxidant, 26 parts of phosphoric acid, 1 part of nitric acid, 0.4 part of surfactant, 0.8 part of penetrating agent and 0.8 part of corrosion inhibitor.
Further, the acid gel is an acid silica sol.
Further, the strong oxidizer is ammonium persulfate.
Further, the surfactant is sodium dodecyl benzene sulfonate and/or stearic acid; the penetrating agent is fatty alcohol polyoxyethylene ether; the corrosion inhibitor is hexamethylenetetramine and/or water-soluble benzene propyl triazole.
Wherein the acid gel has better adhesiveness, can better connect strong oxidant and corrosive substances, and can dissolve Al (OH) in the corrosive substances on the surface of the aluminum alloy 3 And does not react with inorganic acid; meanwhile, the acid gel has good thixotropic property, and can form a flowable adhesive state under the condition of rapid stirring, thereby being beneficial to the coating of the scavenger in use.
Wherein, phosphoric acid is inorganic medium strong acid without reducing property, which not only can rapidly dissolve corrosives on the surface of aluminum alloy, but also can not react with strong oxidant, thus having higher safety and better cleaning effect. Inorganic strong acids such as sulfurous acid and the like with reducibility and inorganic strong acids such as hydrochloric acid, sulfuric acid and nitric acid can dissolve corrosives on the surface of the aluminum alloy more rapidly, but the inorganic strong acids can also react with a strong oxidant chemically, so that the safety is poor, the strong oxidant can be lost, a large amount of acid mist can be released, and the physical health of operators is affected; the inorganic weak acid such as acetic acid dissolves the corrosives on the surface of the aluminum alloy too slowly, resulting in poor removal of the corrosives.
The strong oxidant can react with corrosives, the corrosives are changed into compact aluminum oxide films, and the rust-changing layer is a corrosion inhibition layer, so that corrosives on the surface of the aluminum alloy are rapidly removed; the surfactant plays roles of infiltration, permeation and dispersion; the penetrating agent can quickly enter the corrosion layer to accelerate the corrosion layer to separate; the corrosion inhibitor can slow down the corrosion of the coating to the substrate.
Wherein under heating conditions, the strong oxidant is decomposed easily by phosphoric acid and acid gel in the scavenger because the peroxide bond in the strong oxidant ammonium persulfate is very unstable, and the acidification and the humidity can provide a small amount of H + . The weakly bound-O-bond is subjected to H + The bond is continuously opened to release the O radical. After a certain ammonium persulfate molecule breaks to generate an active O free radical, the active O free radical slowly moves to the position of another O free radical formed by breaking another ammonium persulfate molecule, the active O free radical and the another O free radical are combined to form a free radical chain reaction, the free radical chain reaction is aggravated by heating, and finally the ammonium persulfate is decomposed. Therefore, most of the existing scavengers are prepared in the prior art and cannot be placed for a long time, and the long-time placement can decompose the ammonium persulfate so that the scavengers fail and cannot be startedTo the cleaning effect.
Ammonium persulfate solution contains a large amount of ammonium ion and peroxodisulfate ion (S 2 O 8 2- ) Hydrolysis of peroxodisulfate ions to hydrogen sulfate ions (HSO) 4 - ) And hydrogen peroxide, hydrogen sulfate ions are readily decomposed to form sulfate ions. In the application, nitric acid is added to increase the oxidation-reduction potential (Eh) of the solution, and the nitrate radical has stronger electron accepting capacity than sulfate radical in an acidic environment, so that the forward progress of the hydrolysis reaction of the peroxodisulfate is inhibited, the forward progress of the decomposition reaction of ammonium persulfate is further effectively inhibited, the decomposition of a strong oxidant is effectively inhibited, and the storage time of the scavenger is prolonged.
However, the addition of nitric acid must not be too great, which would cause chemical reaction with the strong oxidizer, so that the strong oxidizer would be lost, and a large amount of acid mist would be released; meanwhile, the addition amount of nitric acid cannot be too small, so that the inhibition effect of nitric acid on the decomposition of the strong oxidant is not obvious due to too small addition amount, and the storage time cannot be prolonged obviously. Thus, in the present application, the amount of nitric acid added is 0.3 to 4 parts.
In the application, sulfuric acid cannot be added, because sulfate ions are in the ammonium persulfate solution, the inhibition effect of adding sulfuric acid is not obvious; hydrochloric acid cannot be added either, because hydrochloric acid is a reducing acid, and promotes forward progress of the decomposition reaction of the strong oxidizing agent, so that the strong oxidizing agent is rapidly decomposed.
Based on the same inventive concept, the second aspect of the application also provides a preparation method of the aluminum alloy surface corrosion remover, which comprises the following steps:
mixing and stirring acid gel, strong oxidant, phosphoric acid, nitric acid, surfactant, penetrating agent and corrosion inhibitor in parts by mass to form a viscose scavenger;
and standing the viscose scavenger to form the aluminum alloy surface corrosion scavenger.
Further, the stirring speed is 300-600 r/min.
Further, the stirring speed was 500r/min.
In the prior art, stirring and heating (the heating temperature is generally 100-150 ℃) are needed in the preparation process of the scavenger, and the heating can enable the components to be rapidly dissolved and mixed. However, as described above, heating results in poor stability of the strong oxidizing agent, and the resulting scavenger cannot be stored for a long period of time, and must be prepared on site, so that the operation cost increases. Experiments show that under the condition of no heating, the stirring speed of 300-600 r/min can ensure that each solid solute is quickly and uniformly dissolved in the mixed solution of the acidic silica sol/phosphoric acid/nitric acid, and the chemical property of the strong oxidant is stable, so that the prepared scavenger can be stored for a long time, and the actual operation process is greatly facilitated.
Wherein, the stirring speed is preferably 300-600 r/min.
If the stirring speed is less than 300r/min, the acidic silica sol is bonded too early, so that the scavenger is formed into a solid state too early, and part of components in the solid state are still undissolved, so that all the components in the scavenger can not fully play a role, and the scavenging effect of the scavenger is obviously reduced; if the stirring speed is higher than 600r/min, the acidic liquid drops are easy to splash in the preparation process, and the safety of operators is endangered.
The scavenger prepared by the method has low toxicity and small diffusion, and is very suitable for the rapid treatment of aluminum alloy surface corrosion; the solid scavenger is prepared by utilizing good cementing property and thixotropic property of acidic silica sol and combining ammonium persulfate and a strong oxidant, and can be prepared into a flowable viscose state by stirring, so that the solid scavenger is favorable for subsequent coating on the surface to be cleared, and can be naturally solidified after standing for a period of time, and the solid scavenger is convenient to recover and clean.
Based on the same inventive concept, a third aspect of the present application provides an application of an aluminum alloy surface corrosion remover, stirring the aluminum alloy surface corrosion remover prepared in any one of the second aspects to a glue state with fluidity, coating the glue state on the aluminum alloy surface to be removed, standing until the remover is solidified, and cleaning the remover until the aluminum alloy surface is exposed.
The application effect is as follows: the cleaning agent is coated on the surface of the aluminum alloy to be cleaned, tiny bubbles are produced on the surface after the coating, the surface is cleaned after a period of time (for example, 30 min), the corrosive substances on the surface of the aluminum alloy can be quickly cleaned, rust spots on the cleaned surface are almost completely cleaned, the surface is metallic, the operation is simple, and the cleaning effect of the corrosive substances is good. The scavenger is solid, has fluidity after being fully stirred, can be uniformly coated on the surface of the aluminum alloy, and is easy to recycle the cured product after rust removal.
From the above, the aluminum alloy surface corrosion remover and the preparation method and application thereof can effectively inhibit the decomposition of the strong oxidant due to the addition of nitric acid, prolong the storage time of the remover, ensure that the aluminum alloy surface corrosion remover can be stably stored for a long time, and can be prepared without heating for more than 180 days, and the preparation process is simple and reduces the energy consumption; the scavenger is coated on the surface of the aluminum alloy to be scavenged, so that corrosive substances on the surface of the aluminum alloy can be scavenged rapidly, the operation is simple, and the corrosive substances scavenging effect is good; the phosphoric acid is used for replacing the traditional strong acid dissolution, so that strong acid mist generated when corrosive substances on the surface of the aluminum alloy are removed can be avoided, and the health of operators is not influenced; in addition, the aluminum alloy with the clean surface can be obtained after coating for a period of time until the scavenger is solidified and cleaning, and the aluminum alloy is not required to be cleaned by adopting a mechanical method with high strength, so that the aluminum alloy is suitable for equipment without overhaul and repair conditions, and has wide application range.
Drawings
In order to more clearly illustrate the technical solutions of the present application or related art, the drawings that are required to be used in the description of the embodiments or related art will be briefly described below, and it is apparent that the drawings in the following description are only embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort to those of ordinary skill in the art.
FIG. 1 is a photograph of an aluminum alloy surface after a first coating of a scavenger prepared in example 5 of the present application;
FIG. 2 is a photograph of the surface of an aluminum alloy after the first coating of the scavenger prepared in comparative example 3 of the present application;
fig. 3 is a photograph of the surface of the aluminum alloy after the second coating of the scavenger prepared in comparative example 4 of the present application.
Detailed Description
For a better understanding of the objects, technical solutions and advantages of the present disclosure, the present disclosure will be further described in detail below with reference to the following specific examples and with reference to the accompanying drawings.
It should be noted that unless otherwise defined, technical terms used in the following examples have the same meaning as commonly understood by those skilled in the art to which the present invention pertains. The test reagents used in the following examples, unless otherwise specified, are all conventional biochemical reagents; the experimental methods are conventional methods unless otherwise specified.
Example 1
An aluminum alloy surface corrosion remover is provided, comprising: the coating comprises the following components in parts by weight: 50 parts of acidic silica sol, 10 parts of strong oxidant ammonium persulfate, 15 parts of phosphoric acid, 0.3 part of nitric acid, 0.01 part of surfactant sodium dodecyl benzene sulfonate, 0.01 part of penetrating agent fatty alcohol polyoxyethylene ether and 0.01 part of corrosion inhibitor hexamethylenetetramine.
The method for preparing the aluminum alloy surface corrosion remover comprises the following steps:
(1) Mixing and stirring acid gel, strong oxidant, phosphoric acid, nitric acid, surfactant, penetrating agent and corrosion inhibitor in parts by mass to form a viscose scavenger; the stirring speed is 300r/min.
(2) And standing the viscose scavenger to form the aluminum alloy surface corrosion scavenger.
Example 2
An aluminum alloy surface corrosion remover is provided, comprising: the coating comprises the following components in parts by weight: 70 parts of acidic silica sol, 20 parts of strong oxidizer ammonium persulfate, 35 parts of phosphoric acid, 4 parts of nitric acid, 2 parts of surfactant sodium dodecyl benzene sulfonate, 4 parts of penetrating agent fatty alcohol polyoxyethylene ether and 4 parts of corrosion inhibitor hexamethylenetetramine.
The method for preparing the aluminum alloy surface corrosion remover comprises the following steps:
(1) Mixing and stirring acid gel, strong oxidant, phosphoric acid, nitric acid, surfactant, penetrating agent and corrosion inhibitor in parts by mass to form a viscose scavenger; the stirring speed is 600r/min.
(2) And standing the viscose scavenger to form the aluminum alloy surface corrosion scavenger.
Example 3
An aluminum alloy surface corrosion remover is provided, comprising: the coating comprises the following components in parts by weight: 55 parts of acidic silica sol, 12 parts of strong oxidizer ammonium persulfate, 20 parts of phosphoric acid, 0.5 part of nitric acid, 0.1 part of surfactant stearic acid, 0.1 part of penetrating agent fatty alcohol polyoxyethylene ether and 0.1 part of corrosion inhibitor water-soluble benzotriazole.
The method for preparing the aluminum alloy surface corrosion remover comprises the following steps:
(1) Mixing and stirring acid gel, strong oxidant, phosphoric acid, nitric acid, surfactant, penetrating agent and corrosion inhibitor in parts by mass to form a viscose scavenger; the stirring speed is 400r/min;
(2) And standing the viscose scavenger to form the aluminum alloy surface corrosion scavenger.
Example 4
An aluminum alloy surface corrosion remover is provided, comprising: the coating comprises the following components in parts by weight: 60 parts of acidic silica sol, 15 parts of strong oxidant ammonium persulfate, 30 parts of phosphoric acid, 2 parts of nitric acid, 1 part of surfactant stearic acid, 2 parts of penetrating agent fatty alcohol polyoxyethylene ether and 2 parts of corrosion inhibitor water-soluble benzotriazole.
The method for preparing the aluminum alloy surface corrosion remover comprises the following steps:
(1) Mixing and stirring acid gel, strong oxidant, phosphoric acid, nitric acid, surfactant, penetrating agent and corrosion inhibitor in parts by mass to form a viscose scavenger; the stirring speed is 400r/min;
(2) And standing the viscose scavenger to form the aluminum alloy surface corrosion scavenger.
Example 5
An aluminum alloy surface corrosion remover is provided, comprising: the coating comprises the following components in parts by weight: 58 parts of acidic silica sol, 14 parts of strong oxidizer ammonium persulfate, 26 parts of phosphoric acid, 1 part of nitric acid, 0.4 part of surfactant sodium dodecyl benzene sulfonate, 0.8 part of penetrating agent fatty alcohol polyoxyethylene ether and 0.8 part of corrosion inhibitor hexamethylenetetramine.
The method for preparing the aluminum alloy surface corrosion remover comprises the following steps:
(1) Mixing and stirring acid gel, strong oxidant, phosphoric acid, nitric acid, surfactant, penetrating agent and corrosion inhibitor in parts by mass to form a viscose scavenger; the stirring speed is 500r/min;
(2) And standing the viscose scavenger to form the aluminum alloy surface corrosion scavenger.
Comparative example 1
An aluminum alloy surface corrosion remover is provided, identical to the composition and method of preparation of example 5, except that nitric acid is not added.
Comparative example 2
An aluminum alloy surface corrosion remover was provided, which was identical to the composition and preparation method of example 5, except that 0.2 parts of nitric acid was added.
Comparative example 3
An aluminum alloy surface corrosion remover was provided, which was identical to the composition and preparation method of example 5, except that 5 parts of nitric acid was added.
Comparative example 4
An aluminum alloy surface corrosion remover is provided, which is identical to the components and the preparation method of the example 5, and the only difference is that nitric acid is not added, and stirring and heating are carried out in the preparation process, wherein the heating temperature is 120 ℃.
Comparative example 5
An aluminum alloy surface corrosion remover is provided, which is identical to the components and the preparation method of the example 5, and the only difference is that the aluminum alloy surface corrosion remover is heated by stirring in the preparation process, and the heating temperature is 120 ℃.
Comparative example 6
An aluminum alloy surface corrosion remover is provided, which is identical to the components and preparation method of example 5, except that stirring is not performed during the preparation process.
Comparative example 7
An aluminum alloy surface corrosion remover was provided, identical to the composition and preparation method of example 5, except that 200r/min of stirring was used during the preparation.
Comparative example 8
An aluminum alloy surface corrosion remover is provided, which is identical to the components and preparation method of example 5, except that a speed of 700r/min is used for stirring thoroughly during the preparation.
Stirring the aluminum alloy surface corrosion scavengers prepared in the above examples and comparative examples to a flowable adhesive state, respectively coating the aluminum alloy surfaces to be cleaned, standing until the scavengers are solidified, and cleaning the scavengers until the aluminum alloy surfaces are re-exposed.
The surface of the aluminum alloy to be cleaned was rated with reference to GB/T6461-2002 (rating of samples and test pieces after corrosion test of metals and other inorganic coating layers on a metal substrate) (see Table 1 below), and the results of the rating are shown in Table 2 below.
TABLE 1 appearance ranking list
In Table 1 above, appearance rating R A To describe the appearance of the test specimens, wherein A represents the percentage of the total area of the base metal corrosion, and the ratings are arranged in order of merit (a rating of 10 indicates no corrosion at all, and a rating of 0 indicates very severe corrosion).
Table 2 test data and results evaluation list of each example and comparative example
In Table 2 above, the surface conditions represent the conditions of the aluminum alloy surface after the scavenger was applied for 30 minutes and the scavenger was removed.
The first coating means that the scavenger is prepared, stirred to a viscous state with fluidity immediately after the scavenger is prepared, and then coated on the surface of the aluminum alloy to be scavenged immediately; the second coating shows that after the prepared scavenger is stored for 7 days, the scavenger is stirred to be in a flowable adhesive state and coated on the surface of the aluminum alloy to be scavenged; the third coating shows that the prepared scavenger is stirred to a viscose state with fluidity after being stored for 60 days and is coated on the surface of the aluminum alloy to be scavenged; the fourth coating shows that the prepared scavenger is stirred to be in a flowable adhesive state after being stored for 180 days and is coated on the surface of the aluminum alloy to be scavenged. Notably, each time the aluminum alloy to be coated was an aluminum alloy with severe surface corrosion (appearance rating R according to GB/T6461-2002 A 0).
As can be seen from table 2 above, the cleaning agents obtained in examples 1 to 5 were coated on the surface of the aluminum alloy to be cleaned (i.e., the first coating) immediately after the preparation, so that the rust spots on the surface of the aluminum alloy could be completely cleaned, the aluminum alloy showed metallic luster (the surface of the aluminum alloy after the first coating in example 5 is referred to fig. 1), which indicates that the cleaning agent can rapidly clean the corrosives on the surface of the aluminum alloy, the operation is simple, and the effect of cleaning the corrosives is good; the cleaning agent obtained in the examples 1 to 5 is coated on the surface of the aluminum alloy after being stored for 7 days (namely, the second coating), rust spots on the surface of the aluminum alloy can be completely removed, and the aluminum alloy shows metallic luster, so that the cleaning agent still has good cleaning effect after being stored for 7 days; the cleaning agent obtained in the examples 1 to 5 is coated on the surface of the aluminum alloy after being stored for 60 days (namely, the third coating), rust spots on the surface of the aluminum alloy can be completely removed, and the aluminum alloy shows metallic luster, so that the cleaning agent still has good cleaning effect after being stored for 60 days; the scavengers obtained in examples 1 to 5 were applied to the surface of the aluminum alloy after 180 days of storage (i.e., the fourth application), and the rust spots on the surface of the aluminum alloy could be completely removed, and the aluminum alloy showed metallic luster, indicating that the scavenger still had good removal effect after 180 days of storage.
In comparative example 1, rust spots on the surface of the aluminum alloy after the first coating are almost completely removed, and the surface is metallic luster, which proves that the scavenger has good removal effect; most rust spots on the surface of the aluminum alloy cannot be removed after the second coating, and the fact that most rust spots cannot be removed after the scavenger is stored for 7 days proves that most of the scavenger fails; the rust spots on the surface of the aluminum alloy after the third coating and the fourth coating are hardly reduced, and the cleaning agent is proved to be completely invalid after being placed for 60 days and 180 days, so that the cleaning effect cannot be achieved. This is because the scavenger of comparative example 1 has largely failed after 7 days of storage because nitric acid was not added so that the decomposition reaction of the strong oxidizing agent was not inhibited, resulting in a short storage time.
In comparative example 2, rust spots on the surface of the aluminum alloy after the first coating are almost completely removed, and the surface is metallic luster, which proves that the scavenger has good removal effect; after the second coating, small rust spots on the surface of the aluminum alloy cannot be removed, and the fact that the scavenger is in a small failure after being stored for 7 days proves that the small rust spots cannot be removed; most rust spots on the surface of the aluminum alloy cannot be removed after the third coating, and the cleaning agent is proved to be most invalid after 60 days of storage, so that most rust spots cannot be removed; the rust on the surface of the aluminum alloy is almost not reduced after the fourth coating, which proves that the scavenger is completely ineffective after being placed for 180 days and cannot play a role in scavenging. This is because the amount of nitric acid added is so small that the effect of nitric acid on inhibiting the decomposition of the strong oxidizing agent is not obvious and the storage time cannot be remarkably prolonged, and therefore the scavenger in comparative example 2 has failed in a small part after 7 days of storage and has failed in a large part after 60 days of storage.
In comparative example 3, rust spots on the surface of the aluminum alloy after the first, second, third and fourth coating were almost completely removed, and it was confirmed that the scavenger still had a scavenging effect after 180 days of storage. However, the surface of the aluminum alloy after the removal had no metallic luster, and the surface was blackened (refer to fig. 2 after the first coating), and the removal effect was not good enough compared to the examples. This is because the amount of nitric acid added is so much that nitric acid reacts chemically with the strong oxidizing agent, and part of the strong oxidizing agent is lost, so that the scavenging effect of the scavenger becomes poor, and after scavenging, the aluminum alloy surface has no metallic luster and the surface is blackened.
In comparative example 4, rust spots on the surface of the aluminum alloy after the first coating are almost completely removed, and the surface is metallic luster, which proves that the scavenger has good removal effect; the rust on the surface of the aluminum alloy after the second, third and fourth coating is hardly reduced (the surface of the aluminum alloy after the second coating is referred to as fig. 3), and the scavenger is proved to be completely ineffective after being placed for 7 days, and cannot play a role in scavenging. This is because nitric acid is not added and heating is performed during the preparation process, so that the decomposition reaction of the strong oxidizing agent cannot be suppressed, resulting in a short storage time, and thus the scavenger of comparative example 4 is completely deactivated after 7 days of storage.
In comparative example 5, rust spots on the surface of the aluminum alloy after the first coating are almost completely removed, and the surface is metallic luster, which proves that the scavenger has good removal effect; most rust spots on the surface of the aluminum alloy cannot be removed after the second coating, and the fact that most rust spots cannot be removed after the scavenger is stored for 7 days proves that most of the scavenger fails; the rust spots on the surface of the aluminum alloy after the third coating and the fourth coating are hardly reduced, and the cleaning agent is proved to be completely invalid after being placed for 60 days and 180 days, so that the cleaning effect cannot be achieved. This is because, although nitric acid is added to inhibit decomposition of the strong oxidizing agent, heating is performed during the preparation process, the breaking of the peroxide bond of the strong oxidizing agent is accelerated by heating, the decomposition of the strong oxidizing agent is accelerated, and finally the storage time of the scavenger is short.
In comparative example 6, the rust spots on the surface of the aluminum alloy after the first, second, third and fourth coating could not be removed, but the storage time of the scavenger could be up to 180 days, which proves that the scavenger has poor removal effect, but the storage time is longer. This is because stirring is not performed during the preparation process, so that the components are already formed into a solid state without being uniformly mixed and completely dissolved, and many components in the solid state are not dissolved, so that the scavenging effect of the scavenger is remarkably reduced.
In comparative example 7, the small rust spots on the surface of the aluminum alloy after the first, second, third and fourth coating could not be removed, but the storage time of the scavenger could reach 180 days, which proves that the scavenger was not good enough but the storage time was long. This is due to the fact that the stirring speed is too low, so that the acidic silica sol is bonded too early, the scavenger is formed into a solid state too early, and part of components in the solid state substance are still undissolved, so that each component in the scavenger can not fully play a role, and the scavenging effect of the scavenger is reduced.
In comparative example 8, rust spots on the surface of the aluminum alloy after the first, second, third and fourth coating are completely removed, and the storage time of the scavenger can reach 180 days, which proves that the scavenger has good removal effect and longer storage time. Although the scavenger has good scavenging effect and long storage time, the excessive stirring speed is easy to cause acidic liquid drops to splash, and the safety of operators is endangered, so that the scavenger is not preferable in the actual preparation process.
In summary, the aluminum alloy surface corrosion remover and the preparation method and application thereof provided by the application can effectively inhibit the decomposition of a strong oxidant due to the addition of nitric acid, prolong the storage time of the remover, ensure that the aluminum alloy surface corrosion remover can be stably stored for a long time, and can be prepared without heating for more than 180 days, and the preparation process is simple and reduces the energy consumption; the scavenger is coated on the surface of the aluminum alloy to be scavenged, so that corrosive substances on the surface of the aluminum alloy can be scavenged rapidly, the operation is simple, and the corrosive substances scavenging effect is good; the phosphoric acid is used for replacing the traditional strong acid dissolution, so that strong acid mist generated when corrosive substances on the surface of the aluminum alloy are removed can be avoided, and the health of operators is not influenced; in addition, the aluminum alloy with the clean surface can be obtained after coating for a period of time until the scavenger is solidified and cleaning, and the aluminum alloy is not required to be cleaned by adopting a mechanical method with high strength, so that the aluminum alloy is suitable for equipment without overhaul and repair conditions, and has wide application range.
Those of ordinary skill in the art will appreciate that: the discussion of any of the embodiments above is merely exemplary and is not intended to suggest that the scope of the disclosure, including the claims, is limited to these examples; the technical features of the above embodiments or in the different embodiments may also be combined under the idea of the present disclosure, the steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present disclosure as described above, which are not provided in details for the sake of brevity.
The disclosed embodiments are intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Accordingly, any omissions, modifications, equivalents, improvements, and the like, which are within the spirit and principles of the embodiments of the disclosure, are intended to be included within the scope of the disclosure.
Claims (5)
1. The aluminum alloy surface corrosion remover is characterized by comprising the following components in parts by weight: 50-70 parts of acid gel, 10-20 parts of strong oxidizer, 15-35 parts of phosphoric acid, 0.3-4 parts of nitric acid, 0.01-2 parts of surfactant, 0.01-4 parts of penetrating agent and 0.01-4 parts of corrosion inhibitor; wherein the strong oxidant is ammonium persulfate, and the acidic gel is acidic silica sol;
the preparation method of the aluminum alloy surface corrosion scavenger comprises the following steps:
mixing acid gel, strong oxidant, phosphoric acid, nitric acid, surfactant, penetrating agent and corrosion inhibitor in parts by mass, and stirring under the condition of no heating to form a viscous state scavenger; and standing the viscose scavenger to form the aluminum alloy surface corrosion scavenger, wherein the stirring speed is 300-500 r/min.
2. The scavenger according to claim 1, characterized in that it consists of the following components in parts by mass: 55-60 parts of acid gel, 12-15 parts of strong oxidizer, 20-30 parts of phosphoric acid, 0.5-2 parts of nitric acid, 0.1-1 part of surfactant, 0.1-2 parts of penetrant and 0.1-2 parts of corrosion inhibitor.
3. The scavenger according to claim 2, characterized in that it consists of the following components in parts by mass: 58 parts of acid gel, 14 parts of strong oxidant, 26 parts of phosphoric acid, 1 part of nitric acid, 0.4 part of surfactant, 0.8 part of penetrating agent and 0.8 part of corrosion inhibitor.
4. The scavenger according to claim 1, wherein the surfactant is sodium dodecylbenzenesulfonate and/or stearic acid; the penetrating agent is fatty alcohol polyoxyethylene ether; the corrosion inhibitor is hexamethylenetetramine and/or water-soluble benzene propyl triazole.
5. Use of the aluminum alloy surface corrosion remover according to any one of claims 1 to 4, wherein the aluminum alloy surface corrosion remover is stirred to a flowable gel state and then coated on the aluminum alloy surface to be removed, and the aluminum alloy surface is left to stand until the remover is solidified, and the remover is cleaned until the aluminum alloy surface is exposed.
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| CN1592778A (en) * | 2001-07-17 | 2005-03-09 | 法国原子能委员会 | Method for treating a surface with a treating gel and treating gel |
| CN105483718A (en) * | 2016-01-19 | 2016-04-13 | 博罗县东明化工有限公司 | Wash-whitening and descaling liquid and die-casting aluminum alloy pretreatment method |
| CN109536961A (en) * | 2018-11-12 | 2019-03-29 | 深圳市中科东明表面处理新材料技术有限公司 | The preparation method of etching solution and etching solution |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1592778A (en) * | 2001-07-17 | 2005-03-09 | 法国原子能委员会 | Method for treating a surface with a treating gel and treating gel |
| CN105483718A (en) * | 2016-01-19 | 2016-04-13 | 博罗县东明化工有限公司 | Wash-whitening and descaling liquid and die-casting aluminum alloy pretreatment method |
| CN109536961A (en) * | 2018-11-12 | 2019-03-29 | 深圳市中科东明表面处理新材料技术有限公司 | The preparation method of etching solution and etching solution |
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