CN115261860A - Aluminum alloy surface corrosion remover and preparation method and application thereof - Google Patents
Aluminum alloy surface corrosion remover and preparation method and application thereof Download PDFInfo
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- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 126
- 230000007797 corrosion Effects 0.000 title claims abstract description 86
- 238000005260 corrosion Methods 0.000 title claims abstract description 86
- 238000002360 preparation method Methods 0.000 title abstract description 32
- 239000002516 radical scavenger Substances 0.000 claims abstract description 121
- 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
- 230000001590 oxidative effect Effects 0.000 claims abstract description 42
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims abstract description 41
- 229910017604 nitric acid Inorganic materials 0.000 claims abstract description 41
- 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
- 239000002253 acid Substances 0.000 claims abstract description 21
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 9
- 230000000149 penetrating effect Effects 0.000 claims abstract description 9
- 238000003756 stirring Methods 0.000 claims description 31
- 230000002378 acidificating effect Effects 0.000 claims description 25
- 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
- 239000000203 mixture Substances 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 11
- 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
- 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
- QRUDEWIWKLJBPS-UHFFFAOYSA-N benzotriazole Chemical compound C1=CC=C2N[N][N]C2=C1 QRUDEWIWKLJBPS-UHFFFAOYSA-N 0.000 claims description 4
- 239000012964 benzotriazole Substances 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
- 238000003860 storage Methods 0.000 abstract description 24
- 230000000694 effects Effects 0.000 abstract description 23
- 238000010438 heat treatment Methods 0.000 abstract description 16
- 230000002000 scavenging effect Effects 0.000 abstract description 14
- 238000000354 decomposition reaction Methods 0.000 abstract description 12
- 230000002035 prolonged effect Effects 0.000 abstract description 4
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 238000000576 coating method Methods 0.000 description 34
- 239000011248 coating agent Substances 0.000 description 30
- 230000000052 comparative effect Effects 0.000 description 23
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 19
- VAZSKTXWXKYQJF-UHFFFAOYSA-N ammonium persulfate Chemical group [NH4+].[NH4+].[O-]S(=O)OOS([O-])=O VAZSKTXWXKYQJF-UHFFFAOYSA-N 0.000 description 15
- 239000003518 caustics Substances 0.000 description 11
- 239000002932 luster Substances 0.000 description 11
- 239000007787 solid Substances 0.000 description 10
- 150000003254 radicals Chemical class 0.000 description 8
- 231100001010 corrosive Toxicity 0.000 description 7
- 238000012360 testing method Methods 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
- -1 ammonium ions Chemical class 0.000 description 6
- 241000221535 Pucciniales Species 0.000 description 5
- 239000003595 mist Substances 0.000 description 5
- 239000000126 substance Substances 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
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 4
- 239000000084 colloidal system Substances 0.000 description 4
- 230000036541 health Effects 0.000 description 4
- 239000000243 solution 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
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 239000003153 chemical reaction reagent Substances 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
- 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
- 239000000956 alloy Substances 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-M hydrogensulfate Chemical compound OS([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-M 0.000 description 2
- 230000005764 inhibitory process Effects 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
- 239000000758 substrate Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910002706 AlOOH Inorganic materials 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 239000012459 cleaning agent 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
- 229910052593 corundum Inorganic materials 0.000 description 1
- 238000005336 cracking 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
- 238000002474 experimental method Methods 0.000 description 1
- 238000006460 hydrolysis reaction Methods 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
- 231100000053 low toxicity Toxicity 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 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
- 230000033116 oxidation-reduction process Effects 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
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- 150000003839 salts Chemical class 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000009974 thixotropic effect Effects 0.000 description 1
- VLPFTAMPNXLGLX-UHFFFAOYSA-N trioctanoin Chemical compound CCCCCCCC(=O)OCC(OC(=O)CCCCCCC)COC(=O)CCCCCCC VLPFTAMPNXLGLX-UHFFFAOYSA-N 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
Images
Classifications
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- 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
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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)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The application provides an aluminum alloy surface corrosion scavenger and a preparation method and application thereof, wherein the scavenger comprises the following components in parts by mass: 50-70 parts of acid gel, 10-20 parts of strong oxidant, 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. According to the aluminum alloy surface corrosion scavenger and the preparation method and application thereof, the decomposition of a strong oxidant can be effectively inhibited due to the addition of nitric acid, the storage time of the scavenger is prolonged, the aluminum alloy surface corrosion scavenger can be stably stored for a long time, the storage period can reach more than 180 days, the scavenger 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 the corrosive on the surface of the aluminum alloy can be rapidly scavenged, the operation is simple, and the effect of scavenging the corrosive 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 scavenger and a preparation method and application thereof.
Background
The equipment deployed in coastal areas is in a harsh environment of high temperature, high humidity, high salt fog and strong ultraviolet for a long time, and the corrosion degree of the equipment is more serious than that of the equipment generally deployed on land. The aluminum and the aluminum alloy firstly naturally form Al in the atmosphere room temperature environment2O3Film of Al2O3The film is exposed for several months or under extreme environmental influences to form a thin layer of AlOOH, which is covered with a layer of Al (OH) over a period of time3. Therefore, when aluminum alloy equipment is exposed to a humid environment for a long time, water, condensation and water vapor are very likely to enter exposed metal surfaces and unsealed riveted seams, thereby causing severe corrosion of the equipment surfaces.
The existing corrosion remover is commonly used for removing iron and corrosive substances on the surface of steel. However, in recent years, as the field of weight reduction of materials receives more and more attention, aluminum alloy products have been widely used in various fields instead of most iron and steel products. Due to different corrosion mechanisms of aluminum alloy and steel, the aluminum alloy and the steel use different corrosion removal reagents. At present, the aluminum alloy is removed by a mechanical method or dissolved by strong acid, and when the methods are used for removing corrosive substances on the surface of the aluminum alloy, strong acid mist is generated, so that the health of operators is influenced. And is not suitable for equipment without major repair and 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 an application thereof.
In view of the above object, the present application provides, in a first aspect, an aluminum alloy surface corrosion remover, comprising: the composition comprises the following components in parts by mass: 50 to 70 portions of acid gel, 10 to 20 portions of strong oxidant, 15 to 35 portions of phosphoric acid, 0.3 to 4 portions of nitric acid, 0.01 to 2 portions of surfactant, 0.01 to 4 portions of penetrating agent and 0.01 to 4 portions of corrosion inhibitor
Further, the scavenger comprises: the composition comprises the following components in parts by weight: 55 to 60 portions of acid gel, 12 to 15 portions of strong oxidant, 20 to 30 portions of phosphoric acid, 0.5 to 2 portions of nitric acid, 0.1 to 1 portion of surfactant, 0.1 to 2 portions of penetrating agent and 0.1 to 2 portions of corrosion inhibitor.
Further, the scavenger comprises: the composition comprises the following components in parts by mass: 58 parts of acidic 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 acidic gel is an acidic silica sol.
Further, the strong oxidant 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 benzotriazole.
Wherein, the acid gel has better adhesiveness, can better connect a strong oxidant and a corrosive substance, and can dissolve Al (OH) in the corrosive substance on the surface of the aluminum alloy3And does not react with inorganic acid; meanwhile, the acid gel has good thixotropy, can form a viscous colloid with fluidity under the condition of rapid stirring, and is beneficial to coating the scavenger in use.
The phosphoric acid is inorganic medium strong acid without reducibility, can quickly dissolve aluminum alloy surface corrosives, cannot react with a strong oxidant, and is higher in safety and better in clearing effect. Inorganic medium and strong acids with reducibility, such as sulfurous acid and the like, and inorganic strong acids, such as hydrochloric acid, sulfuric acid and nitric acid, can dissolve corrosion substances on the surface of the aluminum alloy more quickly, but can also react with a strong oxidant, so that the safety is poor, the strong oxidant can be lost, and a large amount of acid mist can be released, so that the physical health of operators is influenced; inorganic weak acids such as acetic acid dissolve the corrosion on the surface of the aluminum alloy too slowly, resulting in poor removal of the corrosion.
Wherein, the strong oxidant can react with the corrosive substance, the corrosion substance is a compact alumina film, the rust layer is a corrosion-slowing layer, and then the corrosive substance on the surface of the aluminum alloy is rapidly removed; the surfactant plays roles of infiltration, penetration and dispersion; the penetrant can rapidly enter the corrosion layer to accelerate the separation of the corrosion layer; the corrosion inhibitor can slow down the corrosion of the coating on the substrate.
Wherein, under the heating condition, because the peroxide bond in the ammonium persulfate as the strong oxidant is very unstable, the strong oxidant is easily decomposed by phosphoric acid and acidic gel in the scavenging agent, and a small amount of H is provided by acidification and moisture+. The weak-O-O-bond is subjected to H+Without breaking the bond, the O radical is released. After a certain ammonium persulfate molecule is broken to generate an active O free radical, the active O free radical can slowly swim to the position of another O free radical formed by the broken ammonium persulfate molecule, the active O free radical and the another O free radical are combined to form a free radical chain locking reaction, the free radical chain locking reaction is aggravated by heating, and finally the ammonium persulfate is decomposed. Therefore, most of the existing scavenging agents are prepared at present and cannot be placed for a long time, and the ammonium persulfate can be decomposed after the long-time placement, so that the scavenging agent fails to achieve the scavenging effect.
Ammonium persulfate solution contains a large amount of ammonium ions and peroxodisulfate ions (S)2O8 2-) The peroxydisulfate ion hydrolyses to form the hydrogen sulfate ion (HSO)4 -) And hydrogen peroxide, the hydrogen sulfate ions readily decompose to form sulfate ions. In the application, nitric acid is added, so that the oxidation-reduction potential (Eh) of the solution is increased, and the electron accepting capability of nitrate radicals in an acidic environment is stronger than that of sulfate radicals, so that the forward progress of the hydrolysis reaction of peroxydisulfate radicals is inhibited, the forward progress of the decomposition reaction of ammonium persulfate is effectively inhibited, the decomposition of a strong oxidant is effectively inhibited, and the storage time of a scavenging agent is prolonged.
However, the addition amount of the nitric acid cannot be too large, and the nitric acid and the strong oxidant can generate chemical reaction due to too large amount of the nitric acid, so that the strong oxidant is lost, and a large amount of acid mist can be released; meanwhile, the addition amount of the nitric acid cannot be too small, so that the inhibition effect of the nitric acid on the decomposition of the strong oxidant cannot be obvious, and the storage time cannot be prolonged remarkably. Therefore, 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 the ammonium persulfate solution is sulfate ions, the inhibition effect of adding sulfuric acid is not obvious; hydrochloric acid cannot be added either because hydrochloric acid, which is a reducing acid, promotes the forward direction of the decomposition reaction of the strong oxidant so that the strong oxidant decomposes rapidly.
Based on the same inventive concept, the second aspect of the present application further provides a preparation method of the aluminum alloy surface corrosion remover, comprising the following steps:
mixing and stirring acidic gel, strong oxidant, phosphoric acid, nitric acid, surfactant, penetrant and corrosion inhibitor in parts by mass to form a viscose scavenger;
and standing the viscose state scavenging agent to form the aluminum alloy surface corrosion scavenging agent.
Further, the stirring speed is 300-600 r/min.
Further, the stirring speed is 500r/min.
In the prior art, stirring and heating (generally heating temperature is 100-150 ℃) are required in the preparation process of the scavenger, because the heating can quickly dissolve and mix the components. However, as described above, heating results in poor stability of the strong oxidizer, and the prepared scavenger cannot be stored for a long time and must be prepared as it is, so that the operating cost increases. Tests show that under the condition of no heating, all solid solutes can be quickly and uniformly dissolved in the mixed solution of the acidic silica sol, the phosphoric acid and the nitric acid at the stirring speed of 300-600 r/min, the chemical property stability of the strong oxidant can be ensured, 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 to 600r/min.
If the stirring speed is less than 300r/min, the acidic silica sol is bonded too early, so that the scavenger forms a solid state too early, and part of components in the solid substance are still undissolved, so that all the components in the scavenger can not completely play a role, and the scavenging effect of the scavenger is obviously reduced; if the stirring speed is more than 600r/min, acidic liquid drops are easy to splash in the preparation process, and the safety of operators is damaged.
The scavenger prepared by the method has low toxicity and small diffusion, and is very suitable for rapid treatment of aluminum alloy surface corrosion; the solid scavenger is prepared by utilizing the good cementing property and thixotropic property of the acidic silica sol and combining ammonium persulfate and a strong oxidizer, and the solid scavenger can obtain a viscous state with fluidity only by stirring, is beneficial to being coated on the surface to be cleaned subsequently, is naturally cured after standing for a period of time, and is convenient to recover and clean.
Based on the same inventive concept, the third aspect of the present application provides an application of the aluminum alloy surface corrosion scavenger, wherein the aluminum alloy surface corrosion scavenger prepared according to any one of the above second aspects is stirred to a viscous colloid state with fluidity, applied to the surface of the aluminum alloy to be scavenged, and left to stand until the scavenger is solidified, and the scavenger is scavenged until the surface of the aluminum alloy is exposed.
The application effect is as follows: the scavenger is coated on the surface of the aluminum alloy to be scavenged, the coated surface is corroded to produce micro bubbles, and the surface is scavenged after a period of time (for example, 30 min), so that the corrosive substances on the surface of the aluminum alloy can be rapidly scavenged, the surface rusts after being scavenged are almost completely scavenged, the surface is metallic luster, the operation is simple, and the effect of removing the corrosive substances is good. The scavenger is in a solid state, has fluidity after being fully stirred, can be uniformly coated on the surface of the aluminum alloy, and is easy to recover solidified products after rust removal.
From the above, the aluminum alloy surface corrosion scavenger and the preparation method and application thereof provided by the application can effectively inhibit the decomposition of the strong oxidant due to the addition of the nitric acid, prolong the storage time of the scavenger, ensure that the aluminum alloy surface corrosion scavenger can be stably stored for a long time, have a storage period of more than 180 days, can be prepared without heating, have a simple preparation process and reduce energy consumption; the scavenger is coated on the surface of the aluminum alloy to be scavenged, so that the corrosive on the surface of the aluminum alloy can be scavenged rapidly, the operation is simple, and the effect of scavenging the corrosive is good; the phosphoric acid is used for replacing the traditional strong acid for 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 a clean surface can be obtained after the aluminum alloy is coated for a period of time until the scavenger is solidified and cleaned, a mechanical method with high strength is not needed for cleaning, and the aluminum alloy is suitable for equipment without overhaul and refitting conditions and has a wide application range.
Drawings
In order to more clearly illustrate the technical solutions in the present application or related technologies, the drawings required for the embodiments or related technologies in the following description are briefly introduced, and it is obvious that the drawings in the following description are only the embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a photograph of an aluminum alloy surface after a first coating with a scavenger prepared in example 5 of the present application;
FIG. 2 is a photograph of an aluminum alloy surface after a first application of a scavenger made according to comparative example 3 of the present application;
FIG. 3 is a photograph of the aluminum alloy surface after the second coating of the scavenger prepared in comparative example 4 of the present application.
Detailed Description
To further clarify the objects, aspects and advantages of the present disclosure, a more particular description of the disclosure will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
It is to be noted that, unless otherwise defined, technical terms used in the following examples have the same meanings as commonly understood by one of ordinary skill in the art to which the present invention belongs. The test reagents used in the following examples, unless otherwise specified, were all conventional biochemical reagents; the experimental methods are all conventional methods unless otherwise specified.
Example 1
Provided is an aluminum alloy surface corrosion remover, comprising: the composition 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 penetrant 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 acidic gel, strong oxidant, phosphoric acid, nitric acid, surfactant, penetrant and corrosion inhibitor in parts by mass to form a viscose scavenger; the stirring speed is 300r/min.
(2) And standing the viscose state scavenging agent to form the aluminum alloy surface corrosion scavenging agent.
Example 2
Provided is an aluminum alloy surface corrosion remover, which comprises: the composition comprises the following components in parts by mass: 70 parts of acidic silica sol, 20 parts of strong oxidant ammonium persulfate, 35 parts of phosphoric acid, 4 parts of nitric acid, 2 parts of surfactant sodium dodecyl benzene sulfonate, 4 parts of penetrant 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 acidic gel, strong oxidant, phosphoric acid, nitric acid, surfactant, penetrant and corrosion inhibitor in parts by mass to form a viscose scavenger; the stirring speed is 600r/min.
(2) And standing the viscose state scavenging agent to form the aluminum alloy surface corrosion scavenging agent.
Example 3
Provided is an aluminum alloy surface corrosion remover, comprising: the composition comprises the following components in parts by mass: 55 parts of acidic silica sol, 12 parts of strong oxidant ammonium persulfate, 20 parts of phosphoric acid, 0.5 part of nitric acid, 0.1 part of surfactant stearic acid, 0.1 part of penetrant 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 acidic gel, strong oxidant, phosphoric acid, nitric acid, surfactant, penetrant and corrosion inhibitor in parts by mass to form a viscose scavenger; the stirring speed is 400r/min;
(2) And standing the viscose state scavenging agent to form the aluminum alloy surface corrosion scavenging agent.
Example 4
Provided is an aluminum alloy surface corrosion remover, comprising: the composition 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 penetrant 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 acidic gel, strong oxidant, phosphoric acid, nitric acid, surfactant, penetrant 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
Provided is an aluminum alloy surface corrosion remover, comprising: the composition comprises the following components in parts by weight: 58 parts of acidic silica sol, 14 parts of strong oxidant 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 penetrant 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 acidic gel, strong oxidant, phosphoric acid, nitric acid, surfactant, penetrant and corrosion inhibitor in parts by mass to form a viscose scavenger; the stirring speed is 500r/min;
(2) And standing the viscose state scavenging agent to form the aluminum alloy surface corrosion scavenging agent.
Comparative example 1
An aluminum alloy surface corrosion scavenger is provided, the same as the components and preparation method of example 5, with the only difference that no nitric acid is added.
Comparative example 2
An aluminum alloy surface corrosion remover is provided, which has the same composition and preparation method as those of example 5, with the only difference that 0.2 part of nitric acid is added.
Comparative example 3
An aluminum alloy surface corrosion remover is provided, which has the same components and preparation method as those of example 5, with the only difference that 5 parts of nitric acid is added.
Comparative example 4
The aluminum alloy surface corrosion remover is the same as the components and the preparation method of the embodiment 5, and the only difference is that nitric acid is not added, stirring and heating are carried out in the preparation process, and the heating temperature is 120 ℃.
Comparative example 5
The aluminum alloy surface corrosion remover is the same as the components and the preparation method of the embodiment 5, and the only difference is that the aluminum alloy surface corrosion remover is stirred and heated in the preparation process, and the heating temperature is 120 ℃.
Comparative example 6
An aluminum alloy surface corrosion scavenger is provided, which is the same as the components and preparation method of example 5, with the only difference that no stirring is required during the preparation process.
Comparative example 7
An aluminum alloy surface corrosion remover is provided, which has the same composition and preparation method as those of example 5, with the only difference that the preparation process uses a speed of 200r/min for sufficient stirring.
Comparative example 8
An aluminum alloy surface corrosion remover is provided, which has the same composition and preparation method as those of example 5, with the only difference that the preparation process uses a speed of 700r/min for sufficient stirring.
Stirring the aluminum alloy surface corrosion scavenger prepared in the embodiment and the comparative example to a viscous colloid with fluidity, respectively coating the viscous colloid on the surface of the same aluminum alloy to be scavenged, standing until the scavenger is solidified, and cleaning the scavenger until the surface of the aluminum alloy is exposed again.
The surface of the aluminum alloy to be cleaned is rated according to GB/T6461-2002 rating of test pieces and test pieces after corrosion tests of metals and other inorganic coatings on metal substrates (see Table 1 below), and the evaluation results are shown in Table 2 below.
TABLE 1 appearance rating List
In Table 1 above, the appearance rating RATo describe the appearance of the test specimens, wherein A represents the percentage of the total area occupied by the corrosion of the base metal, and the ratings are in order of merit (a rating of 10 means no corrosion at all, and a rating of 0 means very severe corrosion).
TABLE 2 test data and evaluation list of results for each example and comparative example
In the above table 2, the surface condition indicates the condition of the aluminum alloy surface after removing the scavenger after 30min of scavenger application.
The first coating means that the scavenger is prepared and then immediately stirred to be in a viscose state with fluidity, and then immediately coated on the surface of the aluminum alloy to be cleaned; the second coating means that the scavenger is prepared, stored for 7 days, stirred to a viscous state with fluidity and coated on the surface of the aluminum alloy to be removed; the third coating means that after the scavenger is prepared and stored for 60 days, the scavenger is stirred to a viscous state with fluidity and is coated on the surface of the aluminum alloy to be scavenged; the fourth coating means that the scavenger is prepared, stored for 180 days, stirred to a viscous state with fluidity and coated on the surface of the aluminum alloy to be removed. It is worth noting that aluminum is to be coated each timeThe alloy is aluminum alloy with serious surface corrosion (according to GB/T6461-2002 appearance rating R)AIs 0).
As can be seen from the above table 2, the scavenger obtained in examples 1 to 5 is coated on the surface of the aluminum alloy to be scavenged immediately after preparation (i.e., first coating), so that rust spots on the surface of the aluminum alloy can be completely scavenged, and the aluminum alloy shows metallic luster (the surface of the aluminum alloy after first coating in example 5 refers to fig. 1), which indicates that the scavenger can rapidly scavenge corrosive on the surface of the aluminum alloy, and is simple in operation and good in corrosive scavenging effect; when the scavenger obtained in the embodiments 1 to 5 is stored for 7 days and then is coated on the surface of the aluminum alloy (namely, the second coating), rust spots on the surface of the aluminum alloy can still be completely removed, and the aluminum alloy shows metallic luster, which indicates that the scavenger still has a good scavenging effect after being stored for 7 days; the scavenger obtained in the embodiments 1 to 5 is stored for 60 days and then is coated on the surface of the aluminum alloy (namely, the third coating), rust spots on the surface of the aluminum alloy can still be completely removed, and the aluminum alloy shows metallic luster, which indicates that the scavenger still has a good scavenging effect after being stored for 60 days; when the scavenger obtained in the examples 1 to 5 is stored for 180 days and then is coated on the surface of the aluminum alloy (namely, the fourth coating), rust spots on the surface of the aluminum alloy can still be completely removed, and the aluminum alloy shows metallic luster, which indicates that the scavenger still has good removal effect after being stored for 180 days.
In comparative example 1, rust spots on the surface of the aluminum alloy after the first coating are almost completely removed, and the surface becomes metallic luster, which proves that the scavenger has a good removing effect; most rusts on the surface of the aluminum alloy after the second coating cannot be removed, which proves that most of the rusts are invalid after the scavenger is stored for 7 days, and most of rusts cannot be removed; the rust spots on the surface of the aluminum alloy after the third and fourth coatings are almost not reduced, which proves that the scavenger completely fails after being placed for 60 days and 180 days, and cannot achieve the effect of scavenging. This is because nitric acid was not added so as not to inhibit the decomposition reaction of the strong oxidizer, resulting in a short storage time, and therefore, the scavenger in comparative example 1 had mostly failed after 7 days of storage.
In comparative example 2, rust on the surface of the aluminum alloy after the first coating was almost completely removed, and the surface became metallic luster, which proves that the scavenger has a good removing effect; after the second coating, a small part of rusty spots on the surface of the aluminum alloy cannot be removed, which proves that the remover fails after being stored for 7 days, and cannot remove the small part of rusty spots; most rusty spots on the surface of the aluminum alloy after the third coating cannot be removed, which proves that most of the rust spots are invalid and cannot be removed after the scavenger is stored for 60 days; the rust spots on the surface of the aluminum alloy after the fourth coating are almost not reduced, which proves that the scavenger completely fails after being placed for 180 days, and the effect of scavenging cannot be achieved. This is because the amount of nitric acid added was too small to have an appreciable inhibitory effect on the decomposition of the strong oxidizing agent, and the storage time could not be significantly prolonged, so that the scavenger in comparative example 2 failed a little after 7 days of storage and failed a large portion after 60 days of storage.
In comparative example 3, the rust on the surface of the aluminum alloy was almost completely removed after the first, second, third and fourth applications, demonstrating that the remover still has a removing effect after 180 days of storage. However, the surface of the aluminum alloy after the removal had no metallic luster and was blackened (after the first coating, see fig. 2), and the removal effect was not good enough compared to the examples. The reason is that the amount of the added nitric acid is too much, so that the nitric acid and the strong oxidizer have chemical reaction, part of the strong oxidizer is lost, the cleaning effect of the cleaning agent is poor, the surface of the aluminum alloy has no metallic luster after being cleaned, and the surface of the aluminum alloy 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 becomes metallic luster, which proves that the scavenger has a good removing effect; the rust spots on the surface of the aluminum alloy after the second coating, the third coating and the fourth coating are hardly reduced (the surface of the aluminum alloy after the second coating is shown in figure 3), and the fact that the scavenging agent completely fails after being placed for 7 days is proved to have no effect of scavenging. This is because the scavenger of comparative example 4 was completely ineffective after 7 days of storage, because no nitric acid was added and heating was applied during the preparation process, so that the decomposition reaction of the strong oxidant could not be inhibited, resulting in a short storage time.
In comparative example 5, rust on the surface of the aluminum alloy after the first coating was almost completely removed, and the surface became metallic luster, which proves that the scavenger has a good removing effect; most rusty spots on the surface of the aluminum alloy after the second coating cannot be removed, which proves that most of the rust spots are invalid and cannot be removed after the scavenger is stored for 7 days; the rust spots on the surface of the aluminum alloy after the third and fourth coatings are hardly reduced, which proves that the scavenging agent completely fails after being placed for 60 days and 180 days and cannot achieve the scavenging effect. The reason is that although the decomposition of the strong oxidant can be inhibited by adding nitric acid, the heating is carried out in the preparation process, the cracking of the peroxide bond of the strong oxidant is accelerated by the heating, the decomposition of the strong oxidant is accelerated, and finally, the storage time of the scavenger is short.
In comparative example 6, the large rust on the surface of the aluminum alloy could not be removed after the first, second, third and fourth coatings, but the storage time of the scavenger was up to 180 days, which proved that the removal effect of the scavenger was poor, but the storage time was long. This is because the preparation process does not involve stirring, so that the components are already in a solid state without being mixed uniformly and completely dissolved, and many components in the solid substance are not dissolved, which results in a significant decrease in the removal effect of the scavenger.
In comparative example 7, the small rusts on the surface of the aluminum alloy could not be removed after the first, second, third and fourth coating, but the storage time of the scavenger was up to 180 days, which proved that the removal effect of the scavenger was not good enough, but the storage time was long. This is because the stirring speed is too low, so that the acidic silica sol is bonded too early, so that the scavenger forms a solid state too early, and a part of components in the solid state are not dissolved, and finally, the components in the scavenger cannot fully play a role, so that the scavenging effect of the scavenger is reduced.
In comparative example 8, the rust on the surface of the aluminum alloy after the first, second, third and fourth coating was completely removed, and the storage time of the scavenger was up to 180 days, which proves that the scavenger had a good removal effect and a long storage time. Although the scavenging agent has good scavenging effect and long storage time, the excessive stirring speed easily causes acid liquid drops to splash and endangers the safety of operators, so the scavenging agent is not desirable in the actual preparation process.
In summary, the aluminum alloy surface corrosion scavenger and the preparation method and application thereof provided by the application can effectively inhibit the decomposition of the strong oxidant due to the addition of the nitric acid, prolong the storage time of the scavenger, enable the aluminum alloy surface corrosion scavenger to be stably stored for a long time, enable the storage period to be more than 180 days, prepare the scavenger without heating, have simple preparation process and reduce energy consumption; the scavenger is coated on the surface of the aluminum alloy to be scavenged, so that the corrosive on the surface of the aluminum alloy can be scavenged rapidly, the operation is simple, and the effect of scavenging the corrosive 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 a clean surface can be obtained after the aluminum alloy is coated for a period of time until the scavenger is solidified and cleaned, a mechanical method with high strength is not needed for cleaning, and the aluminum alloy is suitable for equipment without overhaul and refitting conditions and has a wide application range.
Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; within the idea of the present disclosure, also technical features in the above embodiments or in different embodiments may be combined, 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 detail 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. Therefore, any omissions, modifications, equivalents, improvements, and the like that may be made within the spirit and principles of the embodiments of the disclosure are intended to be included within the scope of the disclosure.
Claims (10)
1. An aluminum alloy surface corrosion remover, comprising: the composition comprises the following components in parts by weight: 50 to 70 portions of acid gel, 10 to 20 portions of strong oxidant, 15 to 35 portions of phosphoric acid, 0.3 to 4 portions of nitric acid, 0.01 to 2 portions of surfactant, 0.01 to 4 portions of penetrating agent and 0.01 to 4 portions of corrosion inhibitor.
2. The scavenger according to claim 1, comprising: the composition comprises the following components in parts by mass: 55 to 60 portions of acid gel, 12 to 15 portions of strong oxidant, 20 to 30 portions of phosphoric acid, 0.5 to 2 portions of nitric acid, 0.1 to 1 portion of surfactant, 0.1 to 2 portions of penetrating agent and 0.1 to 2 portions of corrosion inhibitor.
3. The scavenger according to claim 2, comprising: the composition comprises the following components in parts by mass: 58 parts of acidic 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 acidic gel is an acidic silica sol.
5. The scavenger according to claim 1, wherein the strong oxidant is ammonium persulfate.
6. The scavenger according to claim 1, wherein the surfactant is sodium dodecylbenzene sulfonate and/or stearic acid; the penetrating agent is fatty alcohol-polyoxyethylene ether; the corrosion inhibitor is hexamethylenetetramine and/or water-soluble benzotriazole.
7. A method for preparing the aluminum alloy surface corrosion remover according to any one of claims 1 to 6, comprising the steps of:
mixing and stirring acidic gel, strong oxidant, phosphoric acid, nitric acid, surfactant, penetrant and corrosion inhibitor in parts by mass to form a viscose scavenger;
and standing the viscose state scavenging agent to form the aluminum alloy surface corrosion scavenging agent.
8. The method according to claim 7, wherein the stirring speed is 300 to 600r/min.
9. The method of claim 8, wherein the stirring speed is 500r/min.
10. The application of the aluminum alloy surface corrosion scavenger is characterized in that the aluminum alloy surface corrosion scavenger prepared according to any one of claims 7 to 9 is stirred to a viscous state with fluidity and then is coated on the surface of the aluminum alloy to be scavenged, and the scavenger is scavenged until the aluminum alloy surface is exposed after the scavenger is solidified.
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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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| 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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