CN113564568A - High-oxidation-resistance nano coating process for surface of magnesium aluminum part - Google Patents
High-oxidation-resistance nano coating process for surface of magnesium aluminum part Download PDFInfo
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- CN113564568A CN113564568A CN202110762204.9A CN202110762204A CN113564568A CN 113564568 A CN113564568 A CN 113564568A CN 202110762204 A CN202110762204 A CN 202110762204A CN 113564568 A CN113564568 A CN 113564568A
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- GANNOFFDYMSBSZ-UHFFFAOYSA-N [AlH3].[Mg] Chemical group [AlH3].[Mg] GANNOFFDYMSBSZ-UHFFFAOYSA-N 0.000 title claims abstract description 89
- 239000002103 nanocoating Substances 0.000 title claims abstract description 32
- 238000000576 coating method Methods 0.000 title claims abstract description 31
- 238000005554 pickling Methods 0.000 claims abstract description 35
- 238000005507 spraying Methods 0.000 claims abstract description 21
- 239000011248 coating agent Substances 0.000 claims abstract description 19
- 238000007689 inspection Methods 0.000 claims abstract description 12
- 239000000843 powder Substances 0.000 claims abstract description 10
- 230000004913 activation Effects 0.000 claims abstract description 8
- 238000004140 cleaning Methods 0.000 claims abstract description 8
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052751 metal Inorganic materials 0.000 claims abstract description 8
- 239000002184 metal Substances 0.000 claims abstract description 8
- 238000005498 polishing Methods 0.000 claims abstract description 8
- 241000519995 Stachys sylvatica Species 0.000 claims abstract description 7
- 238000012216 screening Methods 0.000 claims abstract description 6
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 claims description 40
- 238000010288 cold spraying Methods 0.000 claims description 18
- 230000007797 corrosion Effects 0.000 claims description 16
- 238000005260 corrosion Methods 0.000 claims description 16
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 12
- 239000007789 gas Substances 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 11
- 239000007921 spray Substances 0.000 claims description 8
- 230000001681 protective effect Effects 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 230000003647 oxidation Effects 0.000 claims description 6
- 238000007254 oxidation reaction Methods 0.000 claims description 6
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 6
- 238000012360 testing method Methods 0.000 claims description 6
- FJMNNXLGOUYVHO-UHFFFAOYSA-N aluminum zinc Chemical compound [Al].[Zn] FJMNNXLGOUYVHO-UHFFFAOYSA-N 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 4
- 239000003112 inhibitor Substances 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- 238000004806 packaging method and process Methods 0.000 claims description 4
- 150000003839 salts Chemical class 0.000 claims description 4
- 238000005406 washing Methods 0.000 claims description 4
- 239000000080 wetting agent Substances 0.000 claims description 4
- 241000919514 Albuginaceae Species 0.000 claims description 3
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 claims description 3
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 229940075397 calomel Drugs 0.000 claims description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 claims description 3
- ZOMNIUBKTOKEHS-UHFFFAOYSA-L dimercury dichloride Chemical compound Cl[Hg][Hg]Cl ZOMNIUBKTOKEHS-UHFFFAOYSA-L 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 229910052697 platinum Inorganic materials 0.000 claims description 3
- 150000003325 scandium Chemical class 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 2
- 238000005070 sampling Methods 0.000 claims description 2
- 239000002253 acid Substances 0.000 claims 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 abstract description 12
- 229910052759 nickel Inorganic materials 0.000 abstract description 6
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 4
- 239000010410 layer Substances 0.000 abstract description 4
- 229910052749 magnesium Inorganic materials 0.000 abstract description 4
- 239000011777 magnesium Substances 0.000 abstract description 4
- 239000000126 substance Substances 0.000 abstract description 3
- 230000003064 anti-oxidating effect Effects 0.000 abstract description 2
- 239000011247 coating layer Substances 0.000 abstract description 2
- 241001163841 Albugo ipomoeae-panduratae Species 0.000 abstract 1
- 229910000861 Mg alloy Inorganic materials 0.000 description 12
- 229910000838 Al alloy Inorganic materials 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 150000002739 metals Chemical class 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007888 film coating Substances 0.000 description 1
- 238000009501 film coating Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000008213 purified water Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Images
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
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
- C23C18/18—Pretreatment of the material to be coated
- C23C18/1803—Pretreatment of the material to be coated of metallic material surfaces or of a non-specific material surfaces
- C23C18/1806—Pretreatment of the material to be coated of metallic material surfaces or of a non-specific material surfaces by mechanical pretreatment, e.g. grinding, sanding
-
- 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
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
- C23C18/18—Pretreatment of the material to be coated
- C23C18/1803—Pretreatment of the material to be coated of metallic material surfaces or of a non-specific material surfaces
- C23C18/1824—Pretreatment of the material to be coated of metallic material surfaces or of a non-specific material surfaces by chemical pretreatment
- C23C18/1827—Pretreatment of the material to be coated of metallic material surfaces or of a non-specific material surfaces by chemical pretreatment only one step pretreatment
- C23C18/1834—Use of organic or inorganic compounds other than metals, e.g. activation, sensitisation with polymers
-
- 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
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
- C23C18/31—Coating with metals
- C23C18/32—Coating with nickel, cobalt or mixtures thereof with phosphorus or boron
-
- 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
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C24/00—Coating starting from inorganic powder
- C23C24/02—Coating starting from inorganic powder by application of pressure only
- C23C24/04—Impact or kinetic deposition of particles
-
- 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
Abstract
The invention discloses a high-oxidation-resistance nano coating process for the surface of a magnesium aluminum part, which comprises the following steps: step 1) performing appearance inspection and screening on the appearance surface of the magnesium-aluminum part, eliminating the aluminum-magnesium part which is deformed and has the appearance surface with deep scratches of more than 0.1mm, polishing the appearance surface of the aluminum-magnesium part with white spots and rust stains, removing an oxide layer on the surface of the aluminum-magnesium part, and step 2) cleaning the surface of the polished and derusted magnesium-aluminum part, removing residual metal powder on the surface of the aluminum-magnesium part, and then putting the magnesium-aluminum part into pickling equipment for pickling. This kind of magnadure surface high anti-oxidation nanometer coating technology, adopt pickling activation technology to handle magnadure, can directly deposit on magnesium is collective and obtain the chemical nickel coating layer, then carry out spraying nanometer coating again, can form the multilayer protection on magnadure surface on the one hand, this also damage of nanometer coating after long-time the use and drop, the nickel coating still can provide better protection for the almadure, on the other hand, can make nanometer coating adhere to on the nickel coating, contrast direct spraying has better adhesion on the almadure.
Description
Technical Field
The invention relates to the technical field of road engineering equipment, in particular to a high-oxidation-resistance nano coating process for the surface of a magnesium aluminum part.
Background
The aluminum-magnesium alloy is generally an aluminum alloy taking magnesium as a main additive element, has the advantages of high strength, small density, good heat dissipation and the like, is widely applied to the fields of electronics, automobiles, aerospace and the like, but because magnesium is the metal with the highest chemical activity in all industrial alloys, the aluminum-magnesium alloy is easier to oxidize compared with other aluminum alloys, if the environment of the aluminum-magnesium alloy is dark and moist, the result is more serious, and a plurality of white spots are generated on the surface of the aluminum-magnesium alloy, so that the attractiveness of the aluminum-magnesium alloy is influenced.
When the existing aluminum-magnesium alloy is used, the electrode potential of the aluminum-magnesium alloy is lower than that of most metals, so that once the aluminum-magnesium alloy is contacted with other metals, galvanic corrosion can occur, the corrosion resistance of the aluminum-magnesium alloy is insufficient, the application of the aluminum-magnesium alloy in multiple fields is limited, and on the other hand, the aluminum-magnesium alloy is more active and is easy to oxidize and corrode compared with other aluminum alloys.
Disclosure of Invention
The invention aims to provide a high-oxidation-resistance nano coating process for the surface of a magnesium aluminum part, and aims to solve the problem that once magnesium aluminum alloy provided in the background art is contacted with other metals, galvanic corrosion can occur, so that the corrosion resistance of the magnesium aluminum alloy is insufficient, and the application of the magnesium aluminum alloy in multiple fields is limited.
In order to achieve the purpose, the invention provides the following technical scheme:
a high-oxidation-resistance nano coating process for the surface of a magnesium aluminum part comprises the following steps:
step 1, performing appearance inspection and screening on the appearance surface of the magnesium-aluminum part, removing the aluminum-magnesium part which is deformed and has the appearance surface with deep scratches of more than 0.1mm, polishing the appearance surface of the aluminum-magnesium part with white spots and rusts, and removing an oxide layer on the surface of the aluminum-magnesium part;
step 3, cooling the magnesium-aluminum part after pickling, then putting the magnesium-aluminum part into a water pool for cleaning, then performing spray washing to remove pickling liquid remained on the surface of the magnesium-aluminum part, draining the magnesium-aluminum part, and then performing activation treatment on the magnesium-aluminum part;
step 4, placing the activated magnesium aluminum piece into cold spraying equipment, and injecting protective gas into the cold spraying equipment after other gases in the cold spraying equipment are pumped out;
and 5, spraying a nano coating on the surface of the magnesium-aluminum part by using cold spraying equipment.
And 6, taking out the magnesium aluminum piece after spraying, and performing film-covering packaging after the surface of the magnesium aluminum piece is qualified by spot inspection.
As a still further scheme of the invention: and the polishing mode in the step 1) is to polish the appearance surface of the aluminum-magnesium part by using an angle grinder matched with the bowl-shaped derusting brush.
As a still further scheme of the invention: in the step 3), scandium salt, aluminum salt and carbonic acid are adopted to dissolve in purified water in a molar ratio of 0.5-1.2:1:3 to form a mixed pickling solution, and a wetting agent, a corrosion inhibitor and a synergist are added.
As a still further scheme of the invention: the protective gas in the step 4) is nitrogen or argon.
As a still further scheme of the invention: the spraying material in the step 5) is nano-scale aluminum zinc powder.
As a still further scheme of the invention: the spot inspection procedure in the step 6) comprises a polarized corrosion test which is carried out by using a calomel electrode as a main electrode, a platinum electrode as an auxiliary electrode and matching with 3.5% hydrochloric acid, and a salt spray corrosion test which is carried out by using 6% hydrochloric acid as a solution.
As a still further scheme of the invention: the thickness of the nano coating in the step 5) is 500 mu m.
As a still further scheme of the invention: the spraying distance of the nano coating in the step 5) is 100 mm.
As a still further scheme of the invention: the spraying distance of the nano coating in the step 5) is 120 mm.
Compared with the prior art, the invention has the beneficial effects that:
in this kind of magnadure surface high anti-oxidation nanometer coating technology, adopt pickling activation technology to handle magnadure, can directly deposit on magnesium is collective and obtain the chemical nickel coating layer, then carry out spraying nanometer coating again, can form the multilayer protection on magnadure surface on the one hand, this also damage of nanometer coating after long-time the use and drop, the nickel coating still can provide better protection for the almadure, on the other hand, can make nanometer coating adhere to on the nickel coating, the direct spraying of contrast has better adhesion on the almadure.
Drawings
FIG. 1 is a schematic flow process diagram of a process for preparing a high-oxidation-resistance nano coating on the surface of a magnesium aluminum part.
FIG. 2 is a schematic diagram of a salt spray corrosion experiment result of a high-oxidation-resistance nano coating process on the surface of a magnesium aluminum part.
FIG. 3 is a topography of a magnesium aluminum part surface high oxidation resistance nano coating process sprayed at a distance of 100 mm.
FIG. 4 is a morphology diagram of 120mm distance spraying in a magnesium aluminum part surface high oxidation resistance nano coating process.
Detailed Description
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Referring to fig. 1-3, in an embodiment of the present invention, a process for forming a high oxidation resistant nano-coating on a surface of a magnesium aluminum article includes the following steps:
step 1) carrying out appearance inspection screening on the appearance surface of the magnesium-aluminum part, mainly aiming at rust marks and white spots generated in the process of restorage of the magnesium-aluminum part and scratches caused in the process of logistics transportation, using an angle grinder to be matched with a bowl-shaped derusting brush to polish the appearance surface of the aluminum-magnesium part, and removing bad conditions such as an oxide layer and the white spots on the surface of the aluminum-magnesium part, wherein the derusting brush of a stainless iron wire is used for processing rust removal during derusting, then the derusting brush of a copper wire can be used for polishing to remove scratches on the surface of the aluminum-magnesium part, and if the appearance has obvious deformation and the depth of the scratches exceeds 0.1mm, the aluminum-magnesium part is used as a defective product for standby;
step 3, cooling the magnesium-aluminum part after pickling, then putting the magnesium-aluminum part into a water pool for cleaning, then carrying out spray washing to remove pickling liquid remained on the surface of the magnesium-aluminum part, and then carrying out activation treatment on the magnesium-aluminum part after draining the magnesium-aluminum part;
step 4, placing the magnesium-aluminum piece after the activation treatment into cold spraying equipment, and then injecting nitrogen or argon into the cold spraying equipment to be used as protective gas;
and 5, spraying nano-scale aluminum-zinc powder on the surface of the magnesium-aluminum piece by using cold spraying equipment, so that a nano coating with the thickness of 500 microns is formed on the surface of the magnesium-aluminum piece, and the spraying distance is 100 mm.
And 6, taking out the sprayed magnesium aluminum parts, performing spot inspection on the surfaces of the magnesium aluminum parts, sampling and selecting part of the sprayed magnesium aluminum parts, respectively using a calomel electrode as a main electrode, a platinum electrode as an auxiliary electrode and 3.5% hydrochloric acid for carrying out a polarization corrosion test and using 6% hydrochloric acid as a solution for carrying out a salt spray corrosion test, and carrying out film-coating packaging after the detection is qualified.
In the embodiment, the appearance of the raw material of the aluminum magnesium member is firstly inspected in a manual visual screening mode, wherein the inspection is mainly performed on the appearance surface, a compact rust film is formed on the surface of the aluminum magnesium member after the surface of the aluminum magnesium member is oxidized, so that the appearance of the aluminum magnesium member is difficult to see and does not meet the aesthetic requirements of users, but the surface of the aluminum magnesium member can be prevented from being continuously oxidized and cannot be completely corroded and damaged under natural conditions, particularly on a shielded surface, the rust film cannot be abraded and falls off under normal conditions, the influence on the physical strength of the whole aluminum magnesium member can be ignored, so that the shielded surface is lowered according to the use purpose of the aluminum magnesium member, and the rust film on the surface of the aluminum magnesium member needs to be strictly removed on the appearance surface of the aluminum magnesium member, so that the aluminum magnesium member is prevented from peeling off and falling off after the spray coating is sprayed, the adhesion of the coating is ensured, and the compact rust film of the aluminum magnesium member can also influence the pickling and the appearance of the aluminum magnesium member, The activation effect, because the coating is thin, is difficult to shield deep scratches, and therefore, polishing is necessary;
in the pickling process, as the concentration of the pickling solution is in a reduced state along with the pickling process, a user needs to judge the pickling time according to the appearance change of the aluminum-magnesium part in the pickling tank in the pickling process, and the pickling solution needs to be replaced in time when the pickling time is too long.
The cold spraying equipment is particularly a supersonic low-pressure cold air power sprayer which is driven by compressed air and is sprayed in an environment of protective gas, supersonic gas and solid two-phase gas flow is utilized to shoot coating powder onto the surface of the aluminum-magnesium part to form a dense coating, and the coating formed by the aluminum-zinc powder can meet the high-standard corrosion resistance standard, has better wear resistance and can meet the requirements of the appearance composite user of the aluminum-magnesium alloy of the product.
In cold spraying, the spraying distance is 100mm, and the surface has less pores
Example 2
Referring to fig. 4, a process for preparing a high oxidation resistance nano coating on the surface of a magnesium aluminum part includes the following steps:
step 1, performing appearance inspection and screening on the appearance surface of the magnesium-aluminum part, removing the aluminum-magnesium part which is deformed and has the appearance surface with deep scratches of more than 0.1mm, polishing the appearance surface of the aluminum-magnesium part with white spots and rusts, and removing an oxide layer on the surface of the aluminum-magnesium part;
step 3, cooling the magnesium-aluminum part after pickling, then putting the magnesium-aluminum part into a water pool for cleaning, then carrying out spray washing to remove pickling liquid remained on the surface of the magnesium-aluminum part, and then carrying out activation treatment on the magnesium-aluminum part after draining the magnesium-aluminum part;
step 4, placing the activated magnesium aluminum piece into cold spraying equipment, and injecting protective gas into the cold spraying equipment after other gases in the cold spraying equipment are pumped out;
and 5, spraying a nano coating on the surface of the magnesium-aluminum part by using cold spraying equipment.
And 6, taking out the magnesium aluminum piece after spraying, and performing film-covering packaging after the surface of the magnesium aluminum piece is qualified by spot inspection.
And 5, spraying nano-scale aluminum-zinc powder on the surface of the magnesium-aluminum piece by using cold spraying equipment, so that a nano coating with the thickness of 500 mu m is formed on the surface of the magnesium-aluminum piece, and the spraying distance is 120 mm.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (9)
1. A high-oxidation-resistance nano coating process for the surface of a magnesium aluminum part is characterized by comprising the following steps:
step 1) carrying out appearance inspection screening on the appearance surface of the magnesium-aluminum part, removing the aluminum-magnesium part which is deformed and has the appearance surface with deep scratches of more than 0.1mm, polishing the appearance surface of the aluminum-magnesium part with white spots and rusts, and removing an oxide layer on the surface of the aluminum-magnesium part;
step 2) cleaning the surface of the polished and derusted magnesium aluminum part to remove residual metal powder on the surface of the magnesium aluminum part, and then putting the magnesium aluminum part into pickling equipment for pickling;
step 3) cooling the magnesium-aluminum part after pickling, then putting the magnesium-aluminum part into a water pool for cleaning, then carrying out spray washing to remove pickling liquid remained on the surface of the magnesium-aluminum part, and then carrying out activation treatment on the magnesium-aluminum part after draining the magnesium-aluminum part;
step 4), placing the activated magnesium aluminum piece into cold spraying equipment, and injecting protective gas into the cold spraying equipment after other gases in the cold spraying equipment are pumped out;
and 5) spraying a nano coating on the surface of the magnesium aluminum part by using cold spraying equipment.
And 6) taking out the magnesium aluminum piece after spraying, and performing film-covering packaging after the surface of the magnesium aluminum piece is qualified by spot inspection.
2. The high-oxidation-resistance nano coating process for the surface of the magnesium aluminum part according to claim 1, wherein the polishing mode in the step 1) is to polish the appearance surface of the magnesium aluminum part by using an angle grinder matched with a bowl-shaped rust removing brush.
3. The process for preparing the high-oxidation-resistance nano coating on the surface of the magnesium-aluminum member according to claim 1, wherein the acid pickling solution in the step 3) is prepared by dissolving scandium salt, aluminum salt and carbonic acid in pure water at a molar ratio of 0.5-1.2:1:3 to form a mixed acid pickling solution, and adding a wetting agent, a corrosion inhibitor and a synergist.
4. The process for preparing the high-oxidation-resistance nano coating on the surface of the magnesium aluminum part according to claim 1, wherein the protective gas in the step 4) is nitrogen or argon.
5. The high-oxidation-resistance nano coating process for the surface of the magnesium aluminum part according to claim 1, wherein the spraying material in the step 5) is nano aluminum zinc powder.
6. The process for preparing the high-oxidation-resistance nano coating on the surface of the magnesium aluminum part according to claim 1, wherein the sampling inspection procedure in the step 6) comprises a polarized corrosion test which is carried out by using a calomel electrode as a main electrode, a platinum electrode as an auxiliary electrode and matching with 3.5% hydrochloric acid and a salt spray corrosion test which is carried out by using 6% hydrochloric acid as a solution.
7. The process for preparing the high-oxidation-resistance nano coating on the surface of the magnesium aluminum part according to claim 1, wherein the thickness of the nano coating in the step 5) is 500 μm.
8. The process for coating the surface of the magnesium aluminum part with the high oxidation resistance nano coating according to claim 1, wherein the nano coating in the step 5) is sprayed at a distance of 100 mm.
9. The process for coating the surface of the magnesium aluminum part with the high oxidation resistance nano coating according to claim 1, wherein the nano coating in the step 5) is sprayed at a distance of 120 mm.
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| CN115770719A (en) * | 2022-11-23 | 2023-03-10 | 无锡苏明达科技有限公司 | Zinc-aluminum-magnesium material surface coating treatment process capable of preventing coating from being stamped and falling off |
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