Anticorrosive coating and method for producing the same

Abstract

The present disclosure relates to the field of coating, in particular to a kind of anticorrosive coating and preparation method thereof, the anticorrosive coating includes: connecting layer, transition layer and Mo-Cr-C functional layer, the connecting layer is used to connect with base material;The transition layer is coated on the side of the connecting layer away from the base material;The Mo-Cr-C functional layer is coated on the side of the transition layer away from the connecting layer, to connect the Mo-Cr-C functional layer and the connecting layer by the transition layer;Wherein, the thickness of the Mo-Cr-C functional layer is 1.3 μm-3.8 μm, the atomic percentage ratio in the Mo-Cr-C functional layer is 28%≤Mo≤36%, 22%≤Cr≤40%, 32%≤C≤42%.Can improve the corrosion resistance, wear resistance and wear resistance of marine equipment.

Description

Technical Field

[0001] This disclosure relates to the field of coating technology, and more specifically, to an anti-corrosion coating and a method for preparing the same. Background Technology

[0002] Marine equipment operates in seawater environments for extended periods, where chloride ions corrode it. Corrosion products cause friction, adhesion, and even seizing of components, impacting the equipment's lifespan and safety. Furthermore, seized components often require disassembly during maintenance, significantly increasing repair costs and complexity.

[0003] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0004] The purpose of this disclosure is to provide an anti-corrosion coating and its preparation method, thereby improving the anti-corrosion performance of marine equipment to at least a certain extent.

[0005] According to one aspect of this disclosure, an anti-corrosion coating is provided, the anti-corrosion coating comprising:

[0006] A connecting layer for connecting to a substrate;

[0007] A transition layer is coated on the side of the connecting layer opposite to the substrate;

[0008] A Mo-Cr-C functional layer is coated on the side of the transition layer opposite to the connecting layer, so as to connect the Mo-Cr-C functional layer and the connecting layer through the transition layer;

[0009] The thickness of the Mo-Cr-C functional layer is 1.3μm-3.8μm, and the atomic percentage in the Mo-Cr-C functional layer is: 28%≤Mo≤36%, 22%≤Cr≤40%, and 32%≤C≤42%.

[0010] According to one embodiment of this disclosure, the thickness of the Mo-Cr-C functional layer is 2μm-3μm.

[0011] According to one embodiment of this disclosure, the atomic percentage in the Mo-Cr-C functional layer is: 30%≤Mo≤32%, 28%≤Cr≤30%, and 38%≤C≤42%.

[0012] According to one embodiment of this disclosure, the bonding layer is a Mo-Cr bonding layer with a thickness of 0.8 μm-1.3 μm and an atomic percentage of 41% ≤ Mo ≤ 77% and 23% ≤ Cr ≤ 59%.

[0013] According to one embodiment of the present disclosure, the thickness of the transition layer is 0.9 μm-2.2 μm, and the transition layer includes an alternately arranged first sub-transition layer and a second sub-transition layer, wherein the first sub-transition layer is a Mo-Cr-C transition layer and the second sub-transition layer is a Mo-Cr transition layer;

[0014] The thickness of the first sub-transition layer is 0.06 μm-0.09 μm, and the atomic percentage in the first sub-transition layer is 24%≤Mo≤38%, 15%≤Cr≤43%, and 33%≤C≤47%. The thickness of the second sub-transition layer is 0.12 μm-0.25 μm, and the atomic percentage in the second sub-transition layer is 42%≤Mo≤73% and 27%≤Cr≤58%.

[0015] According to one embodiment of this disclosure, the hardness of the anti-corrosion coating is greater than or equal to 27.4 GPa, and the bonding force between the anti-corrosion coating and the substrate is greater than or equal to 80 N.

[0016] According to one embodiment of this disclosure, in a seawater environment, the coefficient of friction of the anti-corrosion coating is less than or equal to 0.12, and the wear rate of the anti-corrosion coating is less than or equal to 8.4 × 10⁻⁶. -8 mm 3 / m·N, the corrosion weight gain of the anti-corrosion coating is less than or equal to 0.17mg / cm³. 2 .

[0017] According to another aspect of this disclosure, a method for preparing an anti-corrosion coating is provided, the method comprising:

[0018] A bonding layer is formed on the substrate;

[0019] A transition layer is formed on the side of the connecting layer opposite to the substrate;

[0020] A Mo-Cr-C functional layer is deposited on the side of the transition layer opposite to the connecting layer, wherein the atomic percentage of the Mo-Cr-C functional layer is 28%≤Mo≤36%, 22%≤Cr≤40%, and 32%≤C≤42%.

[0021] According to one embodiment of this disclosure, before forming the bonding layer on the substrate, the method further includes:

[0022] The substrate surface is polished, ultrasonically cleaned, and dried. After drying, the metal substrate is placed in a coating machine and vacuumed to 2.0 × 10⁻⁶.-3 ~4.0×10 -3 Pa, and heat to 250-350℃, and keep warm for the first preset time;

[0023] The substrate is subjected to argon ion glow discharge cleaning in an argon atmosphere for a second preset time, followed by ion bombardment of the substrate for 3 to 5 minutes.

[0024] According to one embodiment of the present disclosure, a bonding layer is formed on a substrate, comprising:

[0025] In an argon atmosphere, a Mo-Cr bonding layer was prepared by co-deposition of a Mo target by magnetron sputtering and an arc Mo-Cr target. The argon pressure was 1.1 Pa to 1.3 Pa, the Mo target current was 30 to 40 A, the Mo-Cr target current was 60 to 70 A, the bias voltage was 80 to 100 V, and the deposition time was 20 to 30 min.

[0026] A transition layer is formed on the side of the connecting layer opposite to the substrate, comprising:

[0027] The first and second sub-transition layers are prepared alternately. The preparation of the first sub-transition layer includes co-deposition of a Mo-Cr-C transition layer using a magnetron sputtering Mo target and an arc Mo-Cr target in an argon and acetylene mixed atmosphere. The total pressure of the argon and acetylene mixed atmosphere is 1.4–1.6 Pa, the partial pressure ratio of argon to acetylene is 3–6, the Mo target current is 20–30 A, the Mo-Cr target current is 50–60 A, the bias voltage is 50–90 V, and the deposition time is 2–6 min. The preparation of the second sub-transition layer includes the preparation of the Mo-Cr layer within the transition layer: co-deposition of the Mo-Cr layer within the transition layer using a magnetron sputtering Mo target and an arc Mo-Cr target in an Ar atmosphere. The argon pressure is 1.1–1.3 Pa, the Mo target current is 30–40 A, the Mo-Cr target current is 60–70 A, the bias voltage is 75–125 V, and the deposition time is 3–7 min.

[0028] According to one embodiment of this disclosure, a Mo-Cr-C functional layer is deposited on the side of the transition layer opposite to the connecting layer, comprising:

[0029] Mo-Cr-C functional layers were prepared by co-deposition of a Mo target and an arc Mo-Cr target in an argon and acetylene mixed atmosphere. The total pressure of the argon and acetylene mixed atmosphere was 1.4–1.6 Pa, the partial pressure ratio of argon to acetylene was 3–6, the Mo target current was 20–30 A, the Mo-Cr target current was 50–60 A, the bias voltage was 100–150 V, and the deposition time was 40–120 min.

[0030] The anti-corrosion coating provided in this embodiment includes a connecting layer, a transition layer, and a Mo-Cr-C functional layer arranged sequentially. The connecting layer is used to connect the substrate, the Mo-Cr-C functional layer is used for corrosion protection, and the transition layer connects the Mo-Cr-C functional layer and the connecting layer. The thickness of the Mo-Cr-C functional layer is 1.3μm-3.8μm, and the atomic percentage in the Mo-Cr-C functional layer is 28%≤Mo≤36%, 22%≤Cr≤40%, and 32%≤C≤42%. The anti-corrosion coating can improve the friction reduction, wear resistance, chloride ion corrosion resistance, and oxidation corrosion resistance of marine equipment, and can solve the wear and corrosion problems of parts in marine equipment.

[0031] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0032] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0033] Figure 1 A schematic diagram of the structure of an anti-corrosion coating provided for an exemplary embodiment of this disclosure;

[0034] Figure 2 A flowchart illustrating a method for preparing an anti-corrosion coating, provided as an exemplary embodiment of this disclosure;

[0035] Figure 3 A flowchart illustrating another method for preparing an anti-corrosion coating provided as an exemplary embodiment of this disclosure;

[0036] Figure 4 The SEM morphology of the Mo-Cr-C coating provided in Embodiment 1 of this disclosure;

[0037] Figure 5 The XRD pattern of the Mo-Cr-C coating provided in Embodiment 1 of this disclosure;

[0038] Figure 6 The TEM morphology of the Mo-Cr-C coating provided in Embodiment 1 of this disclosure;

[0039] Figure 7 The coefficient of friction of the Mo-Cr-C coating provided in Embodiment 1 of this disclosure;

[0040] Figure 8 The wear morphology of the Mo-Cr-C coating provided in Embodiment 1 of this disclosure;

[0041] Figure 9 The SEM morphology of the CrN coating provided in Comparative Example 1 of this disclosure;

[0042] Figure 10 The XRD pattern of the CrN coating provided in Comparative Example 1 of this disclosure;

[0043] Figure 11 TEM morphology of the CrN coating provided for Comparative Example 1 of this disclosure;

[0044] Figure 12 The coefficient of friction of the CrN coating provided in Comparative Example 1 of this disclosure;

[0045] Figure 13 The wear morphology of the CrN coating provided in Comparative Example 1 of this disclosure. Detailed Implementation

[0046] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore their detailed description will be omitted.

[0047] The terms “a,” “the,” and “the” are used to indicate the existence of one or more elements / components / etc.; the terms “including” and “having” are used to indicate an open-ended inclusion and to mean that there may be other elements / components / etc. in addition to the listed elements / components / etc.; the terms “first,” “second,” and “third,” etc., are used only as markers and are not a limitation on the number of objects.

[0048] Marine equipment and facilities, such as offshore platforms, ships, submersibles, and oil and gas development equipment, operate in the marine environment for extended periods, making them susceptible to wear and corrosion. The coupled damage from wear and corrosion has become a major scientific and technological challenge for marine equipment components. Currently, marine equipment components primarily utilize metallic materials such as titanium alloys, stainless steel, and nickel alloys. These materials have low surface hardness and poor shear resistance. Transmission, sliding, and friction between components, as well as the scouring effect of seawater particles, all contribute to material wear, leading to system damage and failure. Furthermore, long-term exposure to seawater corrosion behaviors such as chloride ion pitting and oxidation exacerbates friction, adhesion, and even seizing between components, ultimately requiring disassembly and significantly increasing the maintenance cost and difficulty of marine equipment. Therefore, solving the wear and corrosion problem is crucial for improving the service life and safety of marine equipment components.

[0049] Preparing a functional coating using deposition technology to isolate the service surface from the service environment, without affecting the dimensional accuracy of parts and components, is a major solution to the corrosion and wear problems of parts and components. However, the coating materials in related technologies often have single functions and cannot meet the complex and diverse performance requirements of the marine service environment. For example, although coating materials such as TiN and CrN have high hardness, wear resistance, and corrosion resistance, their friction reduction performance is poor, and they cannot play a lubricating role between parts and components. Instead, they accelerate the mutual wear of parts and components. Polymer coatings have good resistance to seawater corrosion and oxidation, but their own strength is low and they cannot withstand the friction, compression, and deformation between parts and components, thus causing damage and peeling. Self-lubricating materials such as soft metals (Ag, Pb, Sn, etc.), MoS2, and metal fluorides can play a short-term friction reduction and lubrication role, but during long-term use, they will lose their self-lubricating and wear resistance due to corrosion and oxidation, leading to the functional failure of the coating. Diamond, DLC, and GLC coatings possess extremely high corrosion and oxidation resistance, as well as very low coefficients of friction and wear rates. However, these carbon-based coatings have poor film-substrate adhesion and high internal stress, which limits their widespread application.

[0050] Exemplary embodiments of this disclosure first provide an anti-corrosion coating, such as Figure 1 As shown, the anti-corrosion coating includes: a connecting layer 21, a transition layer 22, and a Mo-Cr-C functional layer 23. The connecting layer 21 is used to connect with the substrate 10. The transition layer 22 is coated on the side of the connecting layer 21 facing away from the substrate 10. The Mo-Cr-C functional layer 23 is coated on the side of the transition layer 22 facing away from the connecting layer 21, so as to connect the Mo-Cr-C functional layer 23 and the connecting layer 21 through the transition layer 22. The thickness of the Mo-Cr-C functional layer 23 is 1.3μm-3.8μm, and the atomic percentage of the Mo-Cr-C functional layer 23 is 28%≤Mo≤36%, 22%≤Cr≤40%, and 32%≤C≤42%.

[0051] The anti-corrosion coating provided in this embodiment includes a connecting layer 21, a transition layer 22, and a Mo-Cr-C functional layer 23 arranged sequentially. The connecting layer 21 is used to connect the substrate 10, the Mo-Cr-C functional layer 23 is used for corrosion protection, and the transition layer 22 connects the Mo-Cr-C functional layer 23 and the connecting layer 21. The thickness of the Mo-Cr-C functional layer 23 is 1.3μm-3.8μm, and the atomic percentage in the Mo-Cr-C functional layer 23 is 28%≤Mo≤36%, 22%≤Cr≤40%, and 32%≤C≤42%. The anti-corrosion coating can improve the friction reduction, wear resistance, chloride ion corrosion resistance, and oxidation corrosion resistance of marine equipment, and can solve the wear and corrosion problems of parts in marine equipment.

[0052] The anti-corrosion coating provided in the embodiments of this disclosure will be described in detail below:

[0053] In this embodiment, the substrate 10 is a metal substrate, such as a component in marine equipment. The anti-corrosion coating is formed on the surface of the substrate. The anti-corrosion coating can improve the corrosion resistance, wear resistance and friction reduction of the substrate surface. That is, the anti-corrosion coating provided in this disclosure is an integrated coating with friction reduction, wear resistance and anti-corrosion functions for marine environments.

[0054] The connecting layer 21 is a Mo-Cr connecting layer with a thickness of 0.8 μm-1.3 μm. The atomic percentage of the Mo-Cr connecting layer is 41% ≤ Mo ≤ 77% and 23% ≤ Cr ≤ 59%. For example, the Mo-Cr connecting layer has a Mo atomic percentage of 41% and a Cr atomic percentage of 59%; or a Mo atomic percentage of 50% and a Cr atomic percentage of 50%; or a Mo atomic percentage of 77% and a Cr atomic percentage of 23%, etc. Of course, in practical applications, the Mo atomic percentage in the Mo-Cr connecting layer can also be 45%, 52%, 60%, 65%, 70%, or 75%, etc., and correspondingly, the Cr atomic percentage can be 55%, 48%, 40%, 35%, 30%, or 25%, etc., and this embodiment is not limited thereto.

[0055] It should be noted that, in the embodiments disclosed herein, the connecting layer 21 is not limited to a Mo-Cr connecting layer; the connecting layer 21 can also be a Mo connecting layer or a Cr connecting layer, etc. Alternatively, the connecting layer 21 can also be other alloy layers capable of connecting with the substrate.

[0056] The thickness of the Mo-Cr-C functional layer 23 is 1.3 μm-3.8 μm. For example, the thickness of the Mo-Cr-C functional layer 23 can be 1.3 μm, 1.4 μm, 1.5 μm, 1.6 μm, 1.7 μm, 2 μm, 2.3 μm, 2.8 μm, 2.8 μm, 3 μm, 3.5 μm, 3.6 μm, 3.7 μm, or 3.8 μm, etc. Preferably, the thickness of the Mo-Cr-C functional layer 23 is 2 μm-3 μm.

[0057] The atomic percentage in the Mo-Cr-C functional layer 23 is 28%≤Mo≤36%, 22%≤Cr≤40%, and 32%≤C≤42%. Preferably, the atomic percentage in the Mo-Cr-C functional layer 23 is 30%≤Mo≤32%, 28%≤Cr≤30%, and 38%≤C≤42%. For example, the percentage of Mo atoms in the Mo-Cr-C functional layer can be 28%, 29%, 30%, 31%, 32%, 33%, 35%, or 36%, etc.; the percentage of Cr atoms can be 22%, 23%, 25%, 27%, 28%, 30%, 35%, 38%, or 40%, etc.; and the percentage of C atoms can be 32%, 33%, 34%, 35%, 36%, 37%, 35%, 38%, or 42%, etc.

[0058] The thickness of the transition layer 22 is 0.9 μm-2.2 μm. For example, the thickness of the transition layer 22 can be 0.9 μm, 1 μm, 1.2 μm, 1.3 μm, 1.4 μm, 1.5 μm, 1.6 μm, 1.8 μm, 2 μm, 2.1 μm, or 2.2 μm. The transition layer 22 includes an alternately arranged first sub-transition layer 221 and a second sub-transition layer 222. The first sub-transition layer 221 is a Mo-Cr-C transition layer, and the second sub-transition layer 222 is a Mo-Cr transition layer. The thickness of the monolayer first sub-transition layer 221 is 0.06 μm-0.09 μm, and the atomic percentage in the first sub-transition layer 221 is 24%≤Mo≤38%, 15%≤Cr≤43%, and 33%≤C≤47%. The thickness of the monolayer second sub-transition layer 222 is 0.12 μm-0.25 μm, and the atomic percentage in the second sub-transition layer 222 is 42%≤Mo≤73% and 27%≤Cr≤58%.

[0059] For example, the thickness of the monolayer first sub-transition layer 221 can be 0.06 μm, 0.07 μm, 0.08 μm, or 0.09 μm, etc. The thickness of the monolayer second sub-transition layer 222 can be 0.12 μm, 0.13 μm, 0.14 μm, 0.15 μm, 0.18 μm, 0.2 μm, 0.21 μm, 0.22 μm, 0.23 μm, 0.24 μm, or 0.25 μm, etc. In the first sub-transition layer 221, the percentage of Mo atoms can be 24%, 29%, 30%, 31%, 32%, 33%, 35%, or 38%, etc.; the percentage of Cr atoms can be 15%, 20%, 25%, 27%, 28%, 30%, 35%, 38%, or 43%, etc.; and the percentage of C atoms can be 33%, 34%, 35%, 38%, 39%, 40%, 43%, 46%, or 47%, etc. In the second sub-transition layer 222, the percentage of Mo atoms can also be 42%, 52%, 60%, 65%, 70%, or 73%, etc.; correspondingly, the percentage of Cr atoms can be 58%, 48%, 40%, 35%, 30%, or 27%, etc.

[0060] A plurality of alternating first sub-transition layers 221 and second sub-transition layers 222 are disposed between the connecting layer 21 and the Mo-Cr-C functional layer 23. The first sub-transition layer 221 is coated on the side of the connecting layer 21 facing the Mo-Cr-C functional layer 23, and the second sub-transition layer 222 is coated on the side of the Mo-Cr-C functional layer 23 facing the connecting layer 21.

[0061] In this embodiment, a friction-reducing, wear-resistant, and seawater corrosion-resistant coating is formed by sequentially depositing a Mo-Cr bonding layer, a Mo-Cr-C / Mo-Cr alternating composite transition layer, and a Mo-Cr-C functional layer. This results in a good transition in composition and structure, low coating stress, and improved mechanical stability. Furthermore, by controlling the deposition process of Mo, Cr, and C elements, a multi-functional integrated system of friction-reducing, wear-resistant, corrosion-resistant, and oxidation-resistant components is achieved without altering the original dimensions of the components, eliminating the need for redesign and reprocessing, and demonstrating high economic efficiency and applicability.

[0062] The hardness of the anti-corrosion coating is greater than or equal to 27.4 GPa, and the adhesion between the anti-corrosion coating and the substrate is greater than or equal to 80 N. In a seawater environment, the coefficient of friction of the anti-corrosion coating is less than or equal to 0.12, and the wear rate of the anti-corrosion coating is less than or equal to 8.4 × 10⁻⁶. -8 mm 3 / m·N, the corrosion weight gain of the anti-corrosion coating is less than or equal to 0.17mg / cm³. 2 In other words, the coating provided in this disclosure has excellent friction reduction, wear resistance, chloride ion corrosion resistance, and oxidation corrosion resistance, which can solve the wear and corrosion problems of marine parts and components, and has good practical value in the field of marine equipment.

[0063] The anti-corrosion coating provided in this embodiment includes a connecting layer 21, a transition layer 22, and a Mo-Cr-C functional layer 23 arranged sequentially. The connecting layer 21 is used to connect the substrate 10, the Mo-Cr-C functional layer 23 is used for corrosion protection, and the transition layer 22 connects the Mo-Cr-C functional layer 23 and the connecting layer 21. The thickness of the Mo-Cr-C functional layer 23 is 1.3μm-3.8μm, and the atomic percentage in the Mo-Cr-C functional layer 23 is 28%≤Mo≤36%, 22%≤Cr≤40%, and 32%≤C≤42%. The anti-corrosion coating can improve the friction reduction, wear resistance, chloride ion corrosion resistance, and oxidation corrosion resistance of marine equipment, and can solve the wear and corrosion problems of parts in marine equipment.

[0064] Exemplary embodiments of this disclosure also provide a method for preparing an anti-corrosion coating, such as... Figure 2 As shown, the method for preparing this anti-corrosion coating may include the following steps:

[0065] Step S210: Form a bonding layer on the substrate;

[0066] Step S220: A transition layer is formed on the side of the bonding layer opposite to the substrate;

[0067] In step S230, a Mo-Cr-C functional layer is deposited on the side of the transition layer away from the connecting layer. The atomic percentage of the Mo-Cr-C functional layer is 28%≤Mo≤36%, 22%≤Cr≤40%, and 32%≤C≤42%.

[0068] The method for preparing the anti-corrosion coating provided in this embodiment involves sequentially forming a connecting layer, a transition layer, and a Mo-Cr-C functional layer on a substrate. The atomic percentages in the Mo-Cr-C functional layer are 28%≤Mo≤36%, 22%≤Cr≤40%, and 32%≤C≤42%. The anti-corrosion coating can improve the friction reduction, wear resistance, chloride ion corrosion resistance, and oxidation corrosion resistance of marine equipment, thus solving the wear and corrosion problems of parts in marine equipment.

[0069] Furthermore, such as Figure 3 As shown, in the method for preparing the anti-corrosion coating provided in this embodiment, before forming the bonding layer on the substrate, the method further includes:

[0070] Step S240: Polish the substrate surface, perform ultrasonic cleaning and drying. After drying, place the metal substrate into a coating machine and vacuum it to 2.0 × 10⁻⁶. -3 ~4.0×10 -3 Pa, and heat to 250-350℃, and keep warm for the first preset time;

[0071] Step S250: Perform argon ion glow discharge cleaning on the substrate in an argon atmosphere for a second preset time, and then bombard the substrate with ions for 3 to 5 minutes.

[0072] The steps of the method for preparing the anti-corrosion coating provided in the embodiments of this disclosure will be described in detail below:

[0073] In step S240, the substrate surface is polished, ultrasonically cleaned, and dried. After drying, the metal substrate is placed in a coating machine and a vacuum is applied to 2.0 Pa × 10⁻⁶. -3 ~4.0×10 -3 Pa (for example, 2.0 × 10⁻⁶) -3 3.0×10 -3 Or 4.0×10 -3 (etc.), and heat to 250℃~350℃ (for example, 250℃, 300℃ or 350℃), and keep warm for the first preset time.

[0074] Step S240 is a substrate pretreatment step, which can be implemented as follows: polish the surface of the metal substrate, then put it into alcohol and acetone in sequence, ultrasonically clean it for 30 minutes each, and dry it thoroughly. Then, quickly put the dried metal substrate into the coating machine, evacuate it to 2.0×10-3~4.0×10-3Pa, heat it to 250~350℃, and keep it at that temperature for 40 minutes.

[0075] In step S250, the substrate is subjected to argon ion glow discharge cleaning in an argon atmosphere for a second preset time, and then the substrate is subjected to ion bombardment for 3 to 5 minutes.

[0076] Step S250 is the ion cleaning step of the substrate surface, which can be achieved through the following steps: Ar gas is introduced, the vacuum degree is 1.4 Pa, the bias power supply is turned on, the voltage is 1000 V, argon ion glow discharge cleaning is performed for 40 min, then the bias voltage is reduced to 800 V, the arc Mo-Cr target power supply is turned on, the target current is 90-100 A, and ion bombardment is performed for 3-5 min.

[0077] In step S210, a bonding layer is formed on the substrate. This can be achieved by co-depositing a Mo-Cr bonding layer using a magnetron sputtering Mo target and an arc Mo-Cr target in an argon atmosphere. The argon pressure is 1.1 Pa to 1.3 Pa, the Mo target current is 30 A to 40 A (e.g., 30 A, 35 A, or 40 A), the Mo-Cr target current is 60 A to 70 A (e.g., 60 A, 65 A, or 70 A), the bias voltage is 80 V to 100 V (e.g., 80 V, 90 V, or 100 V), and the deposition time is 20 min to 30 min (e.g., 20 min, 25 min, or 30 min).

[0078] In step S220, a transition layer is formed on the side of the connecting layer away from the substrate. This can be achieved by alternately preparing a first sub-transition layer and a second sub-transition layer. The preparation of the first sub-transition layer includes co-depositing a Mo-Cr-C transition layer using a magnetron sputtering Mo target and an arc Mo-Cr target in an argon and acetylene mixed atmosphere. The total pressure of the argon and acetylene mixed atmosphere is 1.4 Pa to 1.6 Pa (e.g., 1.4 Pa, 1.5 Pa, or 1). The partial pressure ratio of argon to acetylene is 3–6 (e.g., 3, 4, 5, or 6), the target current of Mo is 20–30 A (e.g., 20 A, 25 A, or 30 A), the target current of Mo-Cr is 50–60 A (e.g., 60 A, 55 A, or 50 A), the bias voltage is 50–90 V (e.g., 50 V, 80 V, or 90 V), and the deposition time is 2 min–6 min (e.g., 2 min, 3 min, or 6 min). The preparation of the second sub-transition layer includes the preparation of the Mo-Cr layer in the transition layer: in an Ar atmosphere, the Mo-Cr layer in the transition layer is prepared by co-deposition of a Mo target by magnetron sputtering and an arc Mo-Cr target, wherein the argon gas pressure is 1.1 Pa-1.3 Pa, the current of the Mo target is 30 A-40 A (e.g., 30 A, 35 A or 40 A), the current of the Mo-Cr target is 60 A-70 A (e.g., 60 A, 65 A or 70 A), the bias voltage is 75 V-125 V (e.g., 75 V, 100 V or 125 V), and the deposition time is 3 min-7 min (e.g., 3 min, 5 min or 7 min).

[0079] In step S230, a Mo-Cr-C functional layer is deposited on the side of the transition layer away from the connecting layer. This can be achieved by co-depositing the Mo-Cr-C functional layer using a magnetron sputtering Mo target and an arc Mo-Cr target in an argon and acetylene mixed atmosphere. The total pressure of the argon and acetylene mixed atmosphere is 1.4 Pa to 1.6 Pa (e.g., 1.4 Pa, 1.5 Pa, or 1.6 Pa), and the partial pressure ratio of argon to acetylene is [missing information]. The target current is 3 to 6 (e.g., 3, 4, or 6), the target current of Mo is 20 to 30 A (e.g., 20 A, 25 A, or 30 A), the target current of Mo-Cr is 50 A to 60 A (e.g., 50 A, 55 A, or 60 A), the bias voltage is 100 V to 150 V (e.g., 100 V, 120 V, or 150 A), and the deposition time is 40 min to 120 min (e.g., 40 min, 80 min, or 120 min).

[0080] The following examples further illustrate the preparation method of the anti-corrosion coating and verify its characteristics.

[0081] Example 1

[0082] S1, Substrate pretreatment: Polish the surface of the stainless steel substrate, then put it into alcohol and acetone in sequence, ultrasonically clean it for 30 minutes each, and dry it thoroughly. Then, quickly put the dried metal substrate into the coating machine, vacuum it to 2.0×10-3Pa, heat it to 300℃, and keep it at that temperature for 40 minutes.

[0083] S2, Substrate surface ion cleaning: Ar gas is introduced, the vacuum degree is 1.4 Pa, the bias power supply is turned on, the voltage is 1000 V, argon ion glow discharge cleaning is performed for 40 min, then the bias voltage is reduced to 800 V, the arc Mo-Cr target power supply is turned on, the target current is 90 A, the atomic percentage of the Mo-Cr target is 10% Mo and 90% Cr, and ion bombardment is performed for 5 min.

[0084] S3, Preparation of Mo-Cr bonding layer: In an Ar atmosphere, a Mo-Cr bonding layer was prepared by co-deposition of a Mo target by magnetron sputtering and an arc Mo-Cr target. The Ar gas pressure was 1.2 Pa, the Mo target current was 30 A, the Mo-Cr target current was 70 A, the bias voltage was 80 V, and the deposition time was 20 min.

[0085] S4, Preparation of the Mo-Cr-C transition layer in the transition layer: In an Ar and C2H2 mixed atmosphere, the Mo-Cr-C layer in the transition layer is prepared by co-deposition of a Mo target by magnetron sputtering and an arc Mo-Cr target. The total pressure of the Ar and C2H2 mixed atmosphere is 1.4 Pa, the partial pressure ratio of Ar to C2H2 is 6, the Mo target current is 20 A, the Mo-Cr target current is 60 A, the bias voltage is 50 V, and the deposition time is 2 min.

[0086] S5, Preparation of the Mo-Cr transition layer in the transition layer: In an Ar atmosphere, the Mo-Cr layer in the transition layer is prepared by co-deposition of a magnetron sputtering Mo target and an arc Mo-Cr target, wherein the Ar gas pressure is 1.2 Pa, the current of the Mo target is 30 A, the current of the Mo-Cr target is 70 A, the bias voltage is 75 V, and the deposition time is 3 min.

[0087] S6, repeat S4 and S5, alternately deposit Mo-Cr-C transition layer and Mo-Cr transition layer to form a transition layer. The outermost layer of the transition layer is the Mo-Cr transition layer. The total deposition time of the transition layer is 25 min.

[0088] S7, Preparation of Mo-Cr-C functional layer: In an Ar and C2H2 mixed atmosphere, a Mo-Cr-C functional layer was prepared by co-deposition of a Mo target by magnetron sputtering and an arc Mo-Cr target. The total pressure of the Ar and C2H2 mixed atmosphere was 1.4 Pa, the partial pressure ratio of Ar to C2H2 was 6, the Mo target current was 20 A, the Mo-Cr target current was 60 A, the bias voltage was 100 V, and the deposition time was 40 min.

[0089] S8, shut off the target, shut off the gas valve, shut off the bias voltage, and the coating process is complete.

[0090] Testing revealed that the atomic composition of the bonding layer in the coating prepared in this embodiment is Mo. 0.41 Cr 0.59 The thickness is 0.8 μm; the atomic composition of the transition layer is Mo. 0.24 Cr 0.43 C 0.33 / Mo 0.42 Cr 0.58 The thickness is 0.9 μm, of which Mo 0.24 Cr 0.43 C 0.33 The single-layer thickness is 0.06 μm, Mo 0.4 Cr 0.6 The single-layer thickness is 0.12 μm, the modulation ratio is 1:2, and the modulation period is 0.18 μm; the functional layer atomic composition is Mo. 0.28 Cr 0.40 C 0.32 The thickness is 1.3μm; the total coating thickness is 3.0μm. Figure 4 The SEM image shows the surface morphology of the coating prepared in this embodiment. The coating structure is dense and uniform, without any pores. Figure 5 The grazing incidence XRD pattern of the coating prepared in this embodiment shows that the functional layer of the coating exhibits an fcc-CrC structure with obvious nanocrystalline diffraction peaks and no obvious oriented growth. Figure 5 Further TEM analysis revealed that the nanocrystals exhibited an equiaxed distribution with varying grain orientations, consistent with XRD analysis results, and that amorphous phases were distributed between the grains. This amorphous-encapsulated nanocrystal structure is beneficial for the coating's toughness. The coating hardness was 28.4 GPa, and the adhesion strength was 87 N. The friction coefficient and wear track morphology of the coating in simulated seawater are shown below. Figure 7 and Figure 8 As shown, the coefficient of friction remained stable at 0.1 throughout the test, and the wear track morphology was smooth and crack-free, indicating that the coating has good friction-reducing and self-lubricating capabilities. The wear rate was calculated to be 5.8 x 10⁻⁶. -8 mm 3 The value of / m·N indicates that the coating exhibits excellent abrasion resistance in marine environments. After immersion in simulated seawater, the corrosion weight gain was 0.17 mg / cm³. 2 This indicates that the coating has excellent corrosion resistance in marine environments.

[0091] Example 2

[0092] S1, Substrate pretreatment: Polish the surface of the titanium alloy substrate, then put it into alcohol and acetone in sequence, ultrasonically clean it for 30 minutes each, and dry it thoroughly. Then, quickly put the dried metal substrate into the coating machine, vacuum it to 4.0×10-3, heat it to 250℃, and keep it at that temperature for 40 minutes.

[0093] S2, Substrate surface ion cleaning: Ar gas is introduced, the vacuum degree is 1.4 Pa, the bias power supply is turned on, the voltage is 1000V, argon ion glow discharge cleaning is performed for 40 min, then the bias voltage is reduced to 800V, the arc Mo-Cr target power supply is turned on, the target current is 90A, the atomic percentage of the Mo-Cr target is 30% Mo and 70% Cr, and ion bombardment is performed for 3 min.

[0094] S3, Preparation of Mo-Cr bonding layer: In an Ar atmosphere, a Mo-Cr bonding layer was prepared by co-deposition of a Mo target by magnetron sputtering and an arc Mo-Cr target. The Ar gas pressure was 1.1 Pa, the Mo target current was 35 A, the Mo-Cr target current was 65 A, the bias voltage was 90 V, and the deposition time was 25 min.

[0095] S4, Preparation of Mo-Cr-C transition layer: In an Ar and C2H2 mixed atmosphere, the Mo-Cr-C transition layer in the transition layer was prepared by co-deposition of a Mo target by magnetron sputtering and an arc Mo-Cr target. The total pressure of the Ar and C2H2 mixed atmosphere was 1.5 Pa, the partial pressure ratio of Ar to C2H2 was 4, the Mo target current was 25 A, the Mo-Cr target current was 55 A, the bias voltage was 70 V, and the deposition time was 4 min.

[0096] S5, Preparation of Mo-Cr transition layer: In an Ar atmosphere, the Mo-Cr layer in the transition layer was prepared by co-deposition of a Mo target by magnetron sputtering and an arc Mo-Cr target. The Ar pressure was 1.1 Pa, the current of the Mo target was 35 A, the current of the Mo-Cr target was 65 A, the bias voltage was 100 V, and the deposition time was 5 min.

[0097] S6, repeating S4 and S5, alternately depositing Mo-Cr-C transition layer and transition Mo-Cr layer to form a transition layer. The outermost layer of the transition layer is the Mo-Cr layer. The total deposition time of the transition layer is 45 min.

[0098] S7, Preparation of Mo-Cr-C functional layer: In an Ar and C2H2 mixed atmosphere, a Mo-Cr-C functional layer was prepared by co-deposition of a Mo target by magnetron sputtering and an arc Mo-Cr target. The total pressure of the Ar and C2H2 mixed atmosphere was 1.5 Pa, the partial pressure ratio of Ar to C2H2 was 4, the Mo target current was 25 A, the Mo-Cr target current was 55 A, the bias voltage was 125 V, and the deposition time was 90 min.

[0099] S8, shut off the target, shut off the gas valve, shut off the bias voltage, and the coating process is complete.

[0100] Testing revealed that the atomic composition of the bonding layer in the coating prepared in this embodiment is Mo. 0.61 Cr 0.39 The thickness is 1.0 μm; the atomic composition of the transition layer is Mo. 0.34 Cr 0.26 C 0.40 / Mo 0.60 Cr 0.40 The thickness is 1.6 μm, of which Mo 0.34 Cr 0.26 C 0.40 The single-layer thickness is 0.12 μm, Mo 0.60 Cr 0.40 The single-layer thickness is 0.2 μm, the modulation ratio is 0.6, and the modulation period is 0.32 μm; the functional layer atomic composition is Mo. 0.31 Cr 0.29 C 0.40 The thickness is 2.6 μm; the total coating thickness is 5.2 μm. Tests showed the coating hardness to be 31.2 GPa, adhesion to be 80 N, a coefficient of friction of 0.12 in simulated seawater, and a wear rate of 7.8 x 10⁻⁶. -8 mm 3 / m·N, the weight gain due to immersion corrosion in simulated seawater solution is 0.12 mg / cm³. 2 .

[0101] Example 3

[0102] S1, Substrate pretreatment: Polish the surface of the Ni alloy substrate, then put it into alcohol and acetone in sequence, ultrasonically clean it for 30 min each, and dry it thoroughly. Then, quickly put the dried metal substrate into the coating machine, vacuum it to 4.0×10-3 Pa, heat it to 350℃, and keep it at that temperature for 40 min.

[0103] S2, ion cleaning of substrate surface: Ar gas is introduced, vacuum degree is 1.4Pa, bias power supply is turned on, voltage is 1000V, argon ion glow discharge cleaning for 40min, then the bias voltage is reduced to 800V, arc Mo-Cr target power supply is turned on, target current is 100A, the atomic percentage of Mo-Cr target is 45%Mo and 55%Cr, ion bombardment for 5min.

[0104] S3, Preparation of Mo-Cr bonding layer: In an Ar atmosphere, a Mo-Cr bonding layer was prepared by co-deposition of a Mo target by magnetron sputtering and an arc Mo-Cr target. The Ar gas pressure was 1.3 Pa, the Mo target current was 40 A, the Mo-Cr target current was 60 A, the bias voltage was 100 V, and the deposition time was 30 min.

[0105] S4, Preparation of Mo-Cr-C transition layer: In an Ar and C2H2 mixed atmosphere, the Mo-Cr-C layer in the transition layer was prepared by co-deposition of a Mo target by magnetron sputtering and an arc Mo-Cr target. The total pressure of the Ar and C2H2 mixed atmosphere was 1.6 Pa, the partial pressure ratio of Ar to C2H2 was 3, the Mo target current was 30 A, the Mo-Cr target current was 50 A, the bias voltage was 90 V, and the deposition time was 6 min.

[0106] S5, Preparation of Mo-Cr transition layer: In an Ar atmosphere, the Mo-Cr layer in the transition layer is prepared by co-deposition of a Mo target by magnetron sputtering and an arc Mo-Cr target. The Ar pressure is 1.3 Pa, the current of the Mo target is 40 A, the current of the Mo-Cr target is 60 A, the bias voltage is 125 V, and the deposition time is 7 min.

[0107] S6, repeating S4 and S5, alternately depositing Mo-Cr-C transition layer and Mo-Cr transition layer to form a transition layer. The outermost layer of the transition layer is a Mo-Cr layer. The total deposition time of the transition layer is 65 min.

[0108] S7, Preparation of Mo-Cr-C functional layer: In an Ar and C2H2 mixed atmosphere, a Mo-Cr-C functional layer was prepared by co-deposition of a Mo target by magnetron sputtering and an arc Mo-Cr target. The total pressure of the Ar and C2H2 mixed atmosphere was 1.6 Pa, the partial pressure ratio of Ar to C2H2 was 3, the Mo target current was 30 A, the Mo-Cr target current was 50 A, the bias voltage was 150 V, and the deposition time was 120 min.

[0109] S8, shut off the target, shut off the gas valve, shut off the bias voltage, and the coating process is complete.

[0110] Testing revealed that the atomic composition of the bonding layer in the coating prepared in this embodiment is Mo. 0.77 Cr 0.23 The thickness is 1.3 μm; the atomic composition of the transition layer is Mo. 0.38 Cr 0.15 C 0.47 / Mo 0.73 Cr 0.27 The thickness is 2.2 μm, of which Mo 0.34 Cr 0.26 C 0.40 The single-layer thickness is 0.19 μm, Mo 0.60 Cr 0.40 The single-layer thickness is 0.25 μm, the modulation ratio is 1.3, and the modulation period is 0.44 μm; the functional layer atomic composition is Mo. 0.36 Cr 0.22 C 0.42The thickness is 3.8 μm; the total coating thickness is 7.3 μm. Tests showed the coating hardness to be 27.4 GPa, adhesion strength to be 95 N, a coefficient of friction of 0.12 in simulated seawater, and a wear rate of 8.4 x 10⁻⁶. -8 mm 3 / m·N, the weight gain due to immersion corrosion in simulated seawater solution is 0.15mg / cm³. 2 .

[0111] Comparative Example 1

[0112] S1, Substrate pretreatment: Polish the surface of the stainless steel substrate, then put it into alcohol and acetone in sequence, ultrasonically clean it for 30 minutes each, and dry it thoroughly. Then, quickly put the dried metal substrate into the coating machine, vacuum it to 2.0×10-3Pa, heat it to 300℃, and keep it at that temperature for 40 minutes.

[0113] S2, Substrate surface ion cleaning: Ar gas is introduced, the vacuum degree is 1.4 Pa, the bias power supply is turned on, the voltage is 1000 V, argon ion glow discharge cleaning is performed for 40 min, then the bias voltage is reduced to 800 V, the arc Cr target power supply is turned on, the target current is 90 A, and ion bombardment is performed for 5 min.

[0114] S3, Preparation of Cr bonding layer: In an Ar atmosphere, a Cr bonding layer was prepared by co-deposition of a Cr target by magnetron sputtering and an arc Cr target. The Ar pressure was 1.2 Pa, the magnetron sputtering Cr target current was 30 A, the arc Cr target current was 70 A, the bias voltage was 80 V, and the deposition time was 20 min.

[0115] S4, Preparation of CrN functional layer: In an Ar and N2 mixed atmosphere, a CrN functional layer was prepared by co-deposition using a magnetron sputtering Cr target and an arc Cr target. The total pressure of Ar and N2 was 1.4 Pa, the partial pressure ratio of Ar to N2 was 6, the magnetron sputtering Cr target current was 20 A, the arc Cr target current was 60 A, the bias voltage was 100 V, and the deposition time was 60 min.

[0116] S5, shut off the target, shut off the gas valve, shut off the bias voltage, and the coating process is complete.

[0117] Figure 9 The SEM surface morphology of the CrN coating prepared for comparison shows that the coating structure is dense and uniform, without any pores. Figure 10 The image shows the XRD pattern of the CrN coating prepared in this embodiment. The coating has an fcc structure and a distinct 111 growth texture. Figure 11 TEM testing showed that the coating grew in a columnar morphology. The friction coefficient and wear track morphology of the coating in simulated seawater are as follows: Figure 12 and Figure 13As shown, the coefficient of friction remained stable at 0.35 during the test, but the surface of the wear track showed an obvious adhesive layer and some damage, exposing part of the substrate. This indicates that the CrN coating had poor friction-reducing and wear-resistant properties in the simulated seawater solution, and therefore failed to protect the substrate. The weight gain due to immersion corrosion in the simulated seawater solution was 0.68 mg / cm³. 2 .

[0118] As can be seen from the above embodiments and comparative examples, the anti-corrosion coating prepared by the method of preparing the anti-corrosion coating provided in this disclosure can improve the corrosion resistance, wear resistance and friction reduction of the substrate surface. That is, the anti-corrosion coating provided in this disclosure is an integrated coating with friction reduction, wear resistance and anti-corrosion functions for marine environments.

[0119] This disclosure employs a PVD method to prepare a friction-reducing, wear-resistant, and seawater corrosion-resistant coating. It combines the droplet-free, highly dense, and highly homogenized characteristics of magnetron sputtering with the high-energy and high-ionization characteristics of arc plating, resulting in a dense, non-porous coating with excellent bonding performance. This disclosure utilizes a sequentially deposited Mo-Cr bonding layer, a Mo-Cr-C / Mo-Cr alternating composite transition layer, and a Mo-Cr-C functional layer to form the friction-reducing, wear-resistant, and seawater corrosion-resistant coating, achieving a good transition in composition and structure, resulting in low coating stress and improved mechanical stability. The coating provided by this disclosure exhibits excellent friction reduction, wear resistance, chloride ion corrosion resistance, and oxidation corrosion resistance, effectively addressing wear and corrosion problems in marine components and parts, and possessing significant practical value in the marine equipment field. The coating provided by this disclosure has a simple chemical composition. By controlling the deposition process of Mo, Cr, and C elements, it achieves a multi-functional integrated system of friction reduction, wear resistance, corrosion prevention, and oxidation resistance for components and parts without altering their original dimensions, eliminating the need for redesign and reprocessing, and demonstrating high economic efficiency and applicability.

[0120] It should be noted that although the steps of the method for preparing the anti-corrosion coating in this disclosure are described in a specific order in the accompanying drawings, this does not require or imply that these steps must be performed in that specific order, or that all the steps shown must be performed to achieve the desired result. Additional or alternative steps may be omitted, multiple steps may be combined into one step, and / or one step may be broken down into multiple steps.

[0121] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

Claims

1. An anti-corrosion coating, characterized in that, The anti-corrosion coating includes: A connecting layer for connecting to a substrate; A transition layer is coated on the side of the connecting layer opposite to the substrate; A Mo-Cr-C functional layer is coated on the side of the transition layer opposite to the connecting layer, so as to connect the Mo-Cr-C functional layer and the connecting layer through the transition layer; The thickness of the Mo-Cr-C functional layer is 1.3µm-3.8µm, and the atomic percentage in the Mo-Cr-C functional layer is 28%≤Mo≤36%, 22%≤Cr≤40%, and 32%≤C≤42%. The thickness of the transition layer is 0.9µm-2.2µm, and the transition layer includes an alternately arranged first sub-transition layer and a second sub-transition layer. The first sub-transition layer is a Mo-Cr-C transition layer, and the second sub-transition layer is a Mo-Cr transition layer. The thickness of the first sub-transition layer is 0.06µm-0.09µm, and the atomic percentage in the first sub-transition layer is 24%≤Mo≤38%, 15%≤Cr≤43%, and 33%≤C≤47%. The thickness of the second sub-transition layer is 0.12µm-0.25µm, and the atomic percentage in the second sub-transition layer is 42%≤Mo≤73% and 27%≤Cr≤58%.

2. The anti-corrosion coating as described in claim 1, characterized in that, The thickness of the Mo-Cr-C functional layer is 2µm-3µm, and the atomic percentage in the Mo-Cr-C functional layer is: 30%≤Mo≤32%, 28%≤Cr≤30%, and 38%≤C≤42%.

3. The anti-corrosion coating as described in claim 1, characterized in that, The bonding layer is a Mo-Cr bonding layer with a thickness of 0.8µm-1.3µm and an atomic percentage of 41%≤Mo≤77% and 23%≤Cr≤59%.

4. The anti-corrosion coating as described in claim 1, characterized in that, The hardness of the anti-corrosion coating is greater than or equal to 27.4 GPa, and the bonding force between the anti-corrosion coating and the substrate is greater than or equal to 80 N.

5. The anti-corrosion coating as described in claim 4, characterized in that, In a seawater environment, the coefficient of friction of the anti-corrosion coating is less than or equal to 0.12, and the wear rate of the anti-corrosion coating is less than or equal to 8.4 × 10⁻⁶. -8 mm 3 / m·N, the corrosion weight gain of the anti-corrosion coating is less than or equal to 0.17mg / cm³. 2 .

6. A method for preparing an anti-corrosion coating, characterized in that, The method includes: A bonding layer is formed on the substrate; A transition layer is formed on the side of the connecting layer opposite to the substrate; A Mo-Cr-C functional layer is deposited on the side of the transition layer opposite to the connecting layer, wherein the atomic percentage of the Mo-Cr-C functional layer is 28%≤Mo≤36%, 22%≤Cr≤40%, and 32%≤C≤42%. The thickness of the transition layer is 0.9µm-2.2µm, and the transition layer includes an alternately arranged first sub-transition layer and a second sub-transition layer. The first sub-transition layer is a Mo-Cr-C transition layer, and the second sub-transition layer is a Mo-Cr transition layer. The thickness of the first sub-transition layer is 0.06µm-0.09µm, and the atomic percentage in the first sub-transition layer is 24%≤Mo≤38%, 15%≤Cr≤43%, and 33%≤C≤47%. The thickness of the second sub-transition layer is 0.12µm-0.25µm, and the atomic percentage in the second sub-transition layer is 42%≤Mo≤73% and 27%≤Cr≤58%.

7. The method as described in claim 6, characterized in that, Before forming the bonding layer on the substrate, the method further includes: The substrate surface is polished, ultrasonically cleaned, and dried. After drying, the metal substrate is placed in a coating machine and vacuumed to 2.0 × 10⁻⁶. -3 Pa ~ 4.0×10 -3 Pa, and heat to 250℃~350℃, and keep warm for the first preset time; The substrate is subjected to argon ion glow discharge cleaning in an argon atmosphere for a second preset time, followed by ion bombardment of the substrate for 3 to 5 minutes.

8. The method as described in claim 6, characterized in that, Forming a bonding layer on a substrate, including: In an argon atmosphere, a Mo-Cr bonding layer was prepared by co-deposition of a Mo target by magnetron sputtering and an arc Mo-Cr target. The argon pressure was 1.1 Pa to 1.3 Pa, the Mo target current was 30 A to 40 A, the Mo-Cr target current was 60 A to 70 A, the bias voltage was 80 V to 100 V, and the deposition time was 20 to 30 min. A transition layer is formed on the side of the connecting layer opposite to the substrate, comprising: The first and second sub-transition layers were prepared alternately. The preparation of the first sub-transition layer included co-deposition of a Mo-Cr-C transition layer using a magnetron sputtering Mo target and an arc Mo-Cr target in an argon-acetylene mixed atmosphere. The total pressure of the argon-acetylene mixed atmosphere was 1.4 Pa–1.6 Pa, the partial pressure ratio of argon to acetylene was 3–6, the Mo target current was 20–30 A, the Mo-Cr target current was 50 A–60 A, the bias voltage was 50 V–90 V, and the deposition time was 2–6 min. The preparation of the second sub-transition layer included the preparation of the Mo-Cr layer within the transition layer: co-deposition of the Mo-Cr layer within the transition layer using a magnetron sputtering Mo target and an arc Mo-Cr target in an argon atmosphere. The argon pressure was 1.1 Pa–1.3 Pa, the Mo target current was 30 A–40 A, the Mo-Cr target current was 60 A–70 A, the bias voltage was 75 V–125 V, and the deposition time was 3 min. ~7min.

9. The method as described in claim 6, characterized in that, A Mo-Cr-C functional layer is deposited on the side of the transition layer opposite to the connecting layer, comprising: Mo-Cr-C functional layers were prepared by co-deposition of a Mo target and an arc Mo-Cr target in an argon and acetylene mixed atmosphere. The total pressure of the argon and acetylene mixed atmosphere was 1.4 Pa to 1.6 Pa, the partial pressure ratio of argon to acetylene was 3 to 6, the Mo target current was 20 A to 30 A, the Mo-Cr target current was 50 A to 60 A, the bias voltage was 100 V to 150 V, and the deposition time was 40 min to 120 min.

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