CN116200741A - Metal workpiece with nano composite coating and preparation method thereof - Google Patents

Metal workpiece with nano composite coating and preparation method thereof Download PDF

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Publication number
CN116200741A
CN116200741A CN202211626969.0A CN202211626969A CN116200741A CN 116200741 A CN116200741 A CN 116200741A CN 202211626969 A CN202211626969 A CN 202211626969A CN 116200741 A CN116200741 A CN 116200741A
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China
Prior art keywords
metal
coating
nano
layer
silane organic
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CN202211626969.0A
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Chinese (zh)
Inventor
吴楚辉
王仲培
易照耀
刘铼
高旭君
何勃
曾伟伦
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Fulian Yuzhan Technology Shenzhen Co Ltd
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Fulian Yuzhan Technology Shenzhen Co Ltd
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Priority to CN202211626969.0A priority Critical patent/CN116200741A/en
Publication of CN116200741A publication Critical patent/CN116200741A/en
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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
    • 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
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • 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
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/02—Pretreatment of the material to be coated
    • C23C14/021—Cleaning or etching treatments
    • 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
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/02—Pretreatment of the material to be coated
    • C23C14/021—Cleaning or etching treatments
    • C23C14/022—Cleaning or etching treatments by means of bombardment with energetic particles or radiation
    • 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
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
    • C23C14/14—Metallic material, boron or silicon
    • C23C14/16—Metallic material, boron or silicon on metallic substrates or on substrates of boron or silicon
    • C23C14/165—Metallic material, boron or silicon on metallic substrates or on substrates of boron or silicon by cathodic sputtering
    • 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
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
    • C23C14/34—Sputtering
    • C23C14/3457—Sputtering using other particles than noble gas ions
    • 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
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
    • C23C14/34—Sputtering
    • C23C14/35—Sputtering by application of a magnetic field, e.g. magnetron sputtering
    • 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
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
    • C23C14/54—Controlling or regulating the coating process
    • 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
    • C23C26/00—Coating not provided for in groups C23C2/00 - C23C24/00

Abstract

The application provides a metal workpiece with a nano composite coating and a preparation method thereof. According to the nano silane organic coating, the nano silane organic coating is arranged on the metal framework layer, so that the nano silane organic coating is embedded into gaps among crystal grains in the metal framework layer, the metal framework layer can serve as a framework to provide powerful support for the nano silane organic coating, and the hardness, the wear resistance and the service life of the whole nano composite coating are improved. In addition, the nano silane organic coating has low surface energy and has the characteristics of hydrophobic, oleophobic and corrosion resistance, so that the nano composite coating has good oil resistance and stain resistance.

Description

Metal workpiece with nano composite coating and preparation method thereof
Technical Field
The application relates to the technical field of metal surface treatment, in particular to a metal workpiece with a nano composite coating and a preparation method thereof.
Background
Physical vapor deposition (Physical Vapor Deposition, PVD) coatings have the characteristics of high hardness, high wear resistance, high temperature resistance, good oxidation resistance and the like, and are widely used as wear-resistant coatings on the surfaces of metal workpieces (such as cutters, anode carriers, CNC jigs and the like). However, in general, the PVD coating is likely to generate microcracks after heat treatment, which causes poor appearance, and the cutting fluid is likely to penetrate into the microcracks to cause adsorption of aluminum scraps, which further reduces the product yield.
Disclosure of Invention
In view of the above, the present application proposes a metal workpiece with a nanocomposite coating and a method for preparing the same, to solve at least one of the above problems.
In one aspect, the present application provides a method for preparing a nanocomposite coating, comprising the steps of: cleaning the surface of a metal workpiece substrate to be processed; treating the surface of the metal workpiece matrix by adopting plasma; forming a metal framework layer on the surface of the metal workpiece substrate by a physical vapor deposition method, wherein the metal framework layer comprises a plurality of crystal grains, gaps are formed among the crystal grains to form a framework structure, and the crystal grain size is 80-100 nm; and a nano silane organic coating is arranged on the metal framework layer by adopting a spin coating method, and is embedded into the gap and covers the metal framework layer.
In one embodiment, the metal skeleton layer comprises chromium.
In one embodiment, the metal skeleton layer is formed by performing the physical vapor deposition method a plurality of times.
Another aspect of the present application provides a metal work piece having a nanocomposite coating that includes a metal work piece substrate, a metal backbone layer, and a nano-silane organic coating. The metal framework layer is arranged on the surface of the metal workpiece substrate and comprises a plurality of crystal grains, gaps are formed among the crystal grains to form a framework structure, and the crystal grain size is 80-100 nm. The nano silane organic coating is arranged on the surface of the metal framework layer and is embedded into the gap.
In one embodiment, the metal skeleton layer comprises chromium.
In one embodiment, the nanocomposite coating has a thickness of 750nm to 850nm.
In one embodiment, the metal skeleton layer has a thickness of 450nm to 550nm.
According to the nano-silane organic coating, the nano-silane organic coating is arranged on the metal framework layer, so that the nano-silane organic coating is embedded into gaps among crystal grains in the metal framework layer, the metal framework layer can serve as a framework to provide powerful support for the nano-silane organic coating, and the hardness, the wear resistance and the service life of the whole nano-composite coating are improved. In addition, the nano silane organic coating has low surface energy and has the characteristics of hydrophobic, oleophobic and corrosion resistance, so that the nano composite coating has good oil resistance and stain resistance.
Drawings
Fig. 1 is a flowchart of a method for preparing a metal workpiece with a nanocomposite coating according to an embodiment of the present application.
Fig. 2 is a schematic structural diagram of a nanocomposite coating according to an embodiment of the present application.
Fig. 3 is a schematic structural view of a metal workpiece with a nanocomposite coating according to an embodiment of the present application.
Fig. 4 is a surface topography of the metal skeleton layer in the nanocomposite coating shown in fig. 2 or 3.
Description of the main reference signs
Metal work piece 1000
Nanocomposite coating 100
Metal work piece substrate 200
Metal skeleton layer 10
Nano-silane organic coating 20
Die 11
Gap 12
The following detailed description will further illustrate embodiments of the present application in conjunction with the above-described figures.
Detailed Description
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which embodiments of the present application belong. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the examples of the application.
Some embodiments of the present application are described in detail below with reference to the accompanying drawings. The following embodiments and features of the embodiments may be combined with each other without collision.
Referring to fig. 1, an embodiment of the present application provides a method for manufacturing a metal workpiece having a nanocomposite coating. The preparation method comprises the following steps.
Step S10, cleaning the surface of a metal workpiece substrate to be processed.
The metal workpiece substrate can be, but is not limited to, a cutter, an anode carrier, a CNC jig and the like, and the metal workpiece can be, but is not limited to, stainless steel and the like. The cleaning may include polishing, acid washing, alkali washing, ultrasonic cleaning, pure water rinsing, drying, and the like. The polishing can remove rust on the surface of the metal workpiece matrix. The pickling can further improve the rust removal effect of the surface of the metal workpiece matrix. The alkaline washing can remove greasy dirt on the surface of the metal workpiece matrix. The ultrasonic cleaning can remove residues of acid washing and alkali washing and dust sediments so as to further improve the cleanliness of the surface of the metal workpiece substrate. The pure water rinsing and drying (150-200 ℃) can ensure the cleaning and dryness of the surface of the metal workpiece substrate.
And step S20, treating the surface of the metal workpiece substrate by adopting plasma.
The plasma treatment can perform surface activation on the metal workpiece substrate and remove the oxide layer so as to enhance the adhesion between the subsequently formed nano composite coating and the metal workpiece substrate. The plasma treatment may be performed by a conventional or non-conventional plasma treatment method in the art, and is not limited in this application. For example, a metal workpiece substrate may be placed in an etch chamber of an inductively coupled plasma etching system (ICP), at 5X 10 3 pa～8×10 3 Under pa environment, SF can be introduced into the etching cavity 6 Gas or Cl 2 The gas is treated for 3 to 5 minutes, so that the gas can be subjected to chemical reaction with an oxide layer on the surface of the metal workpiece substrate, and the oxide layer is removed.
In step S30, a metal skeleton layer is formed on the surface of the metal workpiece substrate by Physical Vapor Deposition (PVD). The metal framework layer comprises a plurality of crystal grains, gaps are reserved among the crystal grains to form a framework structure, and the crystal grain size is 80-100 nm. That is, the metal skeleton layer has a porous and loose non-compact structure, so that the nano-silane organic coating formed later can be embedded into the metal skeleton layer, and the metal skeleton layer can serve as a skeleton structure to provide a powerful supporting effect for the nano-silane organic coating, so that the hardness of the whole nano-composite coating is improved, and the service life of the whole nano-silane organic coating is prolonged.
Specifically, the workpiece can be placed in a PVD furnace, then the voltage can be controlled to be 100V-120V, the current can be controlled to be 20A-25A, the gas (nitrogen or argon) flow is controlled to be 150 SCCM-160 SCCM, the total deposition time is controlled to be 10 min-15 min, and a metal framework layer is deposited on the surface of the workpiece.
In this embodiment, the metal skeleton layer is formed by performing the physical vapor deposition method a plurality of times. That is, the metal skeleton layer is not formed by one-time deposition, but by deposition, cooling, redeposition, re-cooling, or the like. For example, the deposition may be performed for 3min to 4min, then the cycle is performed for 3 to 4 times at intervals (cooling) of 30S, and the total deposition time is controlled to be 10min to 15min.
The grain size inside the metal framework layer can be increased through multiple deposition, grain boundaries are increased, gaps are formed among part of grains, and part of grains can be in staggered contact, so that the metal framework layer has a porous and loose non-compact framework structure, and the metal framework layer is convenient for subsequent combination with the nano silane organic coating. If the metal framework layer is deposited at one time, crystal grains in the metal framework layer are unevenly distributed and easily grow into a compact structure without generating gaps, which is not beneficial to the embedding of the subsequent nano silane organic coating.
In this embodiment, the metal skeleton layer is made of chromium (Cr). Chromium is selected as the backbone of the nanocomposite coating because it has a relatively high hardness and good wear characteristics, and is widely used in PVD processes.
In some embodiments, the metal skeleton layer has a thickness of approximately 450nm to 550nm. In this embodiment, the thickness of the metal skeleton layer is about 500nm, and the grain size inside the metal skeleton layer can be maintained in the range of 80nm to 100nm. The grain size is in the range of 80 nm-100 nm, so that not only can the formed metal framework layer be ensured to have a non-compact structure, but also the subsequent nano silane organic coating can be ensured to fill the gaps of the grains. If the thickness of the metal skeleton layer is too small, it will not be sufficient to provide sufficient support for the nano-silane organic coating.
And S40, setting a nano silane organic coating on the metal framework layer by adopting a spin coating method, wherein the nano silane organic coating is embedded into the gap and covers the metal framework layer.
Specifically, a metal workpiece substrate with a metal framework layer can be placed on a spin Coating (Spinning) platform, an argon-wrapped nano silane organic compound is sprayed upwards in a spray gun at an angle of 45-60 degrees, the nano silane organic compound is deposited downwards, the deposition time is 20-30 min, and the rotating speed of the platform is 500-1000 rps, so that a nano silane organic Coating is formed. The nano silane organic compound has lower surface energy, has the characteristics of hydrophobicity and oleophobicity, has better protection effect on foreign matters such as cutting fluid or aluminum scraps, and also has higher acid and alkali corrosion resistance, hardness and wear resistance.
Compared with a nano composite coating obtained by directly arranging a nano silane organic coating on the surface of a metal workpiece substrate and depositing the nano silane organic coating on the surface of a metal framework layer, the nano composite coating has higher hardness and service life, and the harder metal framework layer can serve as a framework to provide a supporting effect for the nano silane organic coating.
The nano silane organic coating covers the surface of the metal framework layer, and the thickness of the nano silane organic coating is slightly higher than that of the surface of the metal framework layer. In some embodiments, the nanocomposite coating has a thickness of 750nm to 850nm. In this embodiment, the nanocomposite coating has a thickness of 800nm. White light interference can be used for detecting the surface morphology of the nano-silane organic coating, for example, detecting whether the nano-silane organic coating has holes or not, and whether the thickness meets the requirements or not.
Referring to fig. 2 to 4, an embodiment of the present application provides a metal workpiece 1000 with a nanocomposite coating 100 prepared by the above-mentioned preparation method. The metal workpiece 1000 includes a metal workpiece substrate 200 and a nanocomposite coating 100 provided on a surface of the metal workpiece substrate 200. The metal workpiece substrate 200 may be, but is not limited to, a tool, an anode carrier, a CNC tool, etc., and the material of the metal workpiece substrate 200 may be, but is not limited to, stainless steel, etc.
As shown in fig. 2 and 3, the nanocomposite coating 100 includes a metal skeleton layer 10 and a nano-silane organic coating 20. The metal skeleton layer 10 is disposed on the surface of the metal workpiece substrate 200, the metal skeleton layer 10 includes a plurality of crystal grains 11, gaps 12 are formed between the crystal grains 11 to form a skeleton structure, and the size of the crystal grains 11 is 80 nm-100 nm. The nano-silane organic coating 20 covers the surface of the metal skeleton layer 10 and is embedded in the gaps 12.
The skeleton structure of the metal skeleton layer 10 is a porous and loose non-compact structure formed by large grains 11, so that the nano-silane organic coating 20 can be embedded into the metal skeleton layer 10, and the metal skeleton layer 10 can serve as the skeleton structure to provide a powerful supporting effect for the nano-silane organic coating 20, so that the hardness of the whole nano-composite coating 100 is improved, and the service life of the whole nano-composite coating is prolonged. The nano silane organic coating 20 is embedded into the gaps 12 in the metal framework layer 10, so that the binding force between the nano silane organic coating 20 and the metal framework layer 10 can be improved, and the metal framework layer 10 provides more powerful support for the nano silane organic coating 20.
In some embodiments, the metal skeleton layer 10 may be made of chromium (Cr). Chromium is selected as the backbone of the nanocomposite coating 100 because it has a high hardness and good wear characteristics and is widely used in PVD processes.
In some embodiments, the thickness of the metal skeleton layer 10 is approximately 450nm to 550nm. In this embodiment, the thickness of the metal skeleton layer 10 is about 500nm, and the size of the crystal grains 11 inside the metal skeleton layer can be kept in the range of 80nm to 100nm. The size of the crystal grains 11 is in the range of 80 nm-100 nm, so that the formed metal framework layer 10 can be ensured to have a non-compact structure, and the nano-silane organic coating 20 can be ensured to fill the gaps 12 of the crystal grains 11. If the thickness of the metal skeleton layer 10 is too small, it will not be sufficient to provide sufficient support for the nano-silane organic coating 20.
The nano-silane organic coating 20 is formed of nano-silane organic compounds. The nano silane organic compound has lower surface energy, has the characteristics of hydrophobicity and oleophobicity, has better protection effect on foreign matters such as cutting fluid or aluminum scraps, and also has higher acid and alkali corrosion resistance, hardness and wear resistance.
In some embodiments, the nanocomposite coating 100 has a thickness of 750nm to 850nm. Thus, the nano composite coating 100 can effectively reduce oil stains and aluminum scraps, and has a good effect. In this embodiment, the thickness of the nanocomposite coating 100 is 800nm.
Compared to directly disposing the nano-silane organic coating 20 on the surface of the metal workpiece substrate 200 (i.e., a single nano-silane organic coating 20), the nano-composite coating 100 having the metal skeleton layer 10 and the nano-silane organic coating 20 of the present application has higher hardness and service life, because the harder metal skeleton layer 10 can serve as a skeleton to provide a supporting function for the nano-silane organic coating 20.
The present application will be further described with reference to specific examples and comparative examples.
Example 1
The nanocomposite coating 100 described herein is formed on the surface of a CNC jig (Cr 12 cold work die steel, one of high carbon and high chromium cold work die steel), wherein the thickness of the metal skeleton layer 10 is approximately 450nm to 550nm, the size of the crystal grains 11 is approximately 80nm to 100nm, and the thickness of the nanocomposite coating 100 is approximately 800nm. The metal skeleton layer 10 is made of chromium.
Visual inspection of the appearance of the nanocomposite coating 100 revealed no defects such as particle adhesion on the surface.
The nanocomposite coating 100 described above was subjected to a hydrophobicity test: water drops are arranged on the surface of the nano composite coating 100, whether water drops are formed or not is observed, and after the water drops are formed, the water drops are inclined to flow away, so that no water remains on the surface. Indicating that nanocomposite coating 100 is hydrophobic.
The nanocomposite coating 100 was tested for a static Water Contact Angle (WCA) using a water contact angle tester, and the static water contact angle was measured to be 100 ° to 115 °. When the static water contact angle is less than 90 °, the liquid can spread on a solid surface, which is called a hydrophilic surface; when the static water contact angle is greater than 90 °, the liquid contracts at the solid surface, which is referred to as a hydrophobic surface. The static water contact angle is 100-115 degrees, which indicates that the nanocomposite coating 100 has good hydrophobic and oleophobic properties.
The nanocomposite coating 100 described above was subjected to hardness testing by pencil hardness (pencil hardness) measurement of the coating film. According to industry standards, pencil leads are classified as 13-grade in hardness. From the hardest 6H, the gradient is gradually decreased through 5H, 4H, 3H, 2H, H, through HB with moderate hardness, and then from B, 2B to the softest 6B. Tests show that the pencil hardness of the surface of the nano composite coating 100 is more than 6H, which indicates that the nano composite coating 100 has higher hardness.
The nanocomposite coating 100 described above was subjected to a wear resistance test: the nanocomposite coating 100 was rubbed back and forth with a felt cloth under a pressure of 50kpa for 2s back and forth for 400 times in total. The nanocomposite coating 100 was observed to be free of film separation and falling off, with a static water contact angle of greater than 100 ° as measured. Indicating that the nanocomposite coating 100 has better wear resistance.
Alkali resistance test was performed on the nanocomposite coating 100 described above: the nanocomposite coating 100 was immersed in 10% KOH solution at room temperature for 120mins. The nanocomposite coating 100 was observed to be free of film separation and falling off, with a static water contact angle of greater than 100 ° as measured. Indicating that the nanocomposite coating 100 has a better alkali corrosion resistance.
The Z-direction supporting surface of 1180 aluminum middle frames (mobile phone shells) is subjected to vacuum adsorption by utilizing a CNC jig (Cr 12 cold-working die steel) provided with the nano composite coating 100, the surfaces of the aluminum middle frames are tightly attached to the surfaces of the jig, and the inner cavity of the aluminum middle frames after finish milling and injection molding is processed. Because the aluminum middle frame is thinner, if foreign matters such as aluminum scraps, oil stains, cutting fluid and the like remain on the surface of the jig in the processing process, the aluminum middle frame is easy to cause defects such as middle plate sinking and the like.
In this example, no dishing defect was found in 1180 aluminum center, and the yield was 100%, indicating that no oil stain, cutting fluid, aluminum dust, and other foreign matter remained on the jig surface.
Comparative example 1
The CNC jig of comparative example 1 differs from that of example 1 only in that: the nanocomposite coating 100 is not disposed on the surface. The jig of comparative example 1 was used to vacuum adsorb the Z-direction support surfaces of 2185 aluminum center, and then to finish-mill the aluminum center and mold the post-injection cavity.
After the machining is finished, 19 aluminum middle frames have middle plate sinking, and the yield is 99.13%, which indicates that the surface of the jig has certain oil stain, cutting fluid, aluminum scraps and other foreign matters.
As can be seen from example 1 and comparative example 1, the nanocomposite coating 100 of the present application can effectively reduce the residues of oil stains, cutting fluid, aluminum scraps and other foreign matters on the surface of the jig, that is, the nanocomposite coating 100 has good oil-resistant and anti-fouling (aluminum scraps and the like) properties.
According to the nano silane organic coating 20 arranged on the metal framework layer 10, the nano silane organic coating 20 is embedded into gaps 12 among grains 11 inside the metal framework layer 10, so that the metal framework layer 10 can serve as a framework to provide powerful support for the nano silane organic coating 20, and the hardness, wear resistance and service life of the whole nano composite coating 100 are improved. In addition, the nano-silane organic coating 20 has low surface energy and has the characteristics of hydrophobic, oleophobic and corrosion resistance, so that the nano-composite coating 100 has good oil and stain resistance.
The foregoing description is of some embodiments of the present application, but is not limited to only those embodiments during actual application. Other variations and modifications of the present application, which are apparent to those of ordinary skill in the art, are intended to be within the scope of the present application.

Claims (8)

1. A method for preparing a metal workpiece with a nanocomposite coating, comprising the steps of:
cleaning the surface of a metal workpiece substrate to be processed;
treating the surface of the metal workpiece matrix by adopting plasma;
forming a metal framework layer on the surface of the metal workpiece substrate by a physical vapor deposition method, wherein the metal framework layer comprises a plurality of crystal grains, gaps are formed among the crystal grains to form a framework structure, and the crystal grain size is 80-100 nm;
and a nano silane organic coating is arranged on the metal framework layer by adopting a spin coating method, and is embedded into the gap and covers the metal framework layer.
2. The method of claim 1, wherein the metal framework layer comprises chromium.
3. The method of claim 1, wherein the nanocomposite coating has a thickness of 750nm to 850nm.
4. The method of claim 1, wherein the metal skeleton layer is formed by performing the physical vapor deposition method a plurality of times, and the thickness of the metal skeleton layer is 450nm to 550nm.
5. A metal workpiece having a nanocomposite coating, comprising:
a metal work piece substrate;
the metal framework layer is arranged on the surface of the metal workpiece substrate and comprises a plurality of crystal grains, gaps are formed among the crystal grains to form a framework structure, and the crystal grain size is 80-100 nm; and
and the nano silane organic coating covers the surface of the metal framework layer and is embedded into the gap.
6. The nanocomposite coated metal workpiece according to claim 5, wherein the metal skeleton layer comprises chromium.
7. The metal workpiece having a nanocomposite coating according to claim 5, wherein the nanocomposite coating has a thickness of 750nm to 850nm.
8. The nanocomposite coated metal workpiece according to claim 5, wherein the metal skeleton layer has a thickness of 450nm to 550nm.
CN202211626969.0A 2022-12-16 2022-12-16 Metal workpiece with nano composite coating and preparation method thereof Pending CN116200741A (en)

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