CN115261100B - Solid lubricating coating with antifriction and wear-resistant performance and preparation method and application thereof - Google Patents
Solid lubricating coating with antifriction and wear-resistant performance and preparation method and application thereof Download PDFInfo
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- CN115261100B CN115261100B CN202210561423.5A CN202210561423A CN115261100B CN 115261100 B CN115261100 B CN 115261100B CN 202210561423 A CN202210561423 A CN 202210561423A CN 115261100 B CN115261100 B CN 115261100B
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M137/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing phosphorus
- C10M137/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing phosphorus having no phosphorus-to-carbon bond
- C10M137/04—Phosphate esters
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M129/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen
- C10M129/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen having a carbon chain of less than 30 atoms
- C10M129/26—Carboxylic acids; Salts thereof
- C10M129/28—Carboxylic acids; Salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
- C10M129/30—Carboxylic acids; Salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having 7 or less carbon atoms
- C10M129/36—Carboxylic acids; Salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having 7 or less carbon atoms containing hydroxy groups
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M129/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen
- C10M129/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen having a carbon chain of less than 30 atoms
- C10M129/68—Esters
- C10M129/76—Esters containing free hydroxy or carboxyl groups
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/10—Carboxylix acids; Neutral salts thereof
- C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
- C10M2207/121—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of seven or less carbon atoms
- C10M2207/124—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of seven or less carbon atoms containing hydroxy groups; Ethers thereof
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/28—Esters
- C10M2207/287—Partial esters
- C10M2207/289—Partial esters containing free hydroxy groups
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2223/00—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions
- C10M2223/02—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions having no phosphorus-to-carbon bonds
- C10M2223/04—Phosphate esters
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/06—Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/12—Inhibition of corrosion, e.g. anti-rust agents or anti-corrosives
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/56—Boundary lubrication or thin film lubrication
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2050/00—Form in which the lubricant is applied to the material being lubricated
- C10N2050/015—Dispersions of solid lubricants
- C10N2050/02—Dispersions of solid lubricants dissolved or suspended in a carrier which subsequently evaporates to leave a lubricant coating
Abstract
The invention provides a solid lubricating coating with antifriction and wear-resistant performances and a preparation method and application thereof, belonging to the technical field of solid lubrication. According to the invention, the metal surface is subjected to in-situ chemical modification by using the natural organic acid solution, the natural organic acid and the metal are subjected to a complexing reaction to generate an organic acid metal complexing film, the contact area between metal friction pairs is reduced, and a transfer film is easily generated on the metal surface in the friction process, so that the antifriction and antiwear performances are improved, therefore, the solid lubricating coating prepared by the method has excellent antifriction and antiwear performances. Compared with dry friction between metals, the friction coefficient of the solid lubricating coating is reduced by 8-20 times, and the wear rate is reduced by 3-20 times.
Description
Technical Field
The invention relates to the technical field of solid lubrication, in particular to a solid lubricating coating with antifriction and wear-resistant performances, and a preparation method and application thereof.
Background
In industrial production and daily life, friction and abrasion cause a great deal of energy consumption and economic loss. Lubrication is an important technical method for effectively solving the problems, and common lubricating materials can be divided into liquid lubricants and solid lubricants. The solid lubricant mainly comprises a substance with a layered structure (graphite, molybdenum disulfide and the like), a high molecular polymer (polytetrafluoroethylene, polyimide and the like) or a soft metal (gold, silver, copper, lead, zinc and the like). The solid lubricating materials have excellent friction performance under special working conditions of high and low temperature, strong radiation, high vacuum and the like, can be used in the environment where liquid lubricants cannot be used, and are widely applied to the fields of aerospace and the like.
However, the above solid lubricants also have some disadvantages in practical use. For example, molybdenum disulfide has poor moisture resistance, and is easily deliquesced, oxidized, and the like in a high-humidity environment, so that the friction performance of molybdenum disulfide is greatly reduced, which limits the use of molybdenum disulfide materials in an atmospheric environment. At present, the preparation method of the solid lubricating coating mainly comprises physical vapor deposition, magnetron sputtering, spraying, brushing or bonding and the like, but the antifriction and antiwear performance of the solid lubricating coating prepared by the method still needs to be improved.
Disclosure of Invention
The invention aims to provide a solid lubricating coating with antifriction and wear-resistant performances, and a preparation method and application thereof.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a preparation method of a solid lubricating coating, which comprises the following steps:
coating the natural organic acid dispersion liquid on the surface of a metal substrate, and performing a complexing reaction to obtain a solid lubricating coating;
the mass concentration of the natural organic acid dispersion liquid is 20-80%; the time of the complex reaction is 5-30 min.
Preferably, the natural organic acid in the natural organic acid dispersion liquid includes at least one of phytic acid, tannic acid, citric acid, oxalic acid, tartaric acid and salicylic acid.
Preferably, the dispersant used in the natural organic acid dispersion is water or ethanol.
Preferably, the metal substrate comprises at least one of copper, GCr15 bearing steel, 304 stainless steel, titanium, aluminum, magnesium, zinc, chromium, and nickel.
Preferably, the mass concentration of the natural organic acid dispersion is 30 to 70%.
Preferably, the time of the complexation reaction is 10-25 min.
Preferably, after the complexing reaction is completed, the natural organic acid dispersion liquid on the surface of the obtained metal material is removed, and the solid lubricating coating is obtained after washing and drying are sequentially carried out.
Preferably, the thickness of the solid lubricating coating is 50 to 200 μm.
The invention provides the solid lubricating coating prepared by the preparation method in the technical scheme.
The invention provides application of the solid lubricating coating in the technical scheme in the fields of industry, transportation, biological medicine or aerospace.
The invention provides a preparation method of a solid lubricating coating, which comprises the following steps: coating the natural organic acid dispersion liquid on the surface of a metal substrate, and performing a complexing reaction to obtain a solid lubricating coating; the mass concentration of the natural organic acid dispersion liquid is 20-80%; the time of the complex reaction is 5-30 min. The invention utilizes natural organic acid solution to carry out in-situ chemical modification on the metal surface, controls the complexing reaction degree of natural organic acid and metal by controlling the concentration and the reaction time of the organic acid, generates a specific organic acid metal complexing film, avoids the dissolution and the falling off of a lubricating coating, reduces the contact area between metal friction pairs, easily generates a transfer film on the metal surface in the friction process, and avoids the direct contact of the friction pairs, thereby reducing the friction and the wear and improving the antifriction and wear resistance of the coating. Compared with dry friction between metals, the friction coefficient of the solid lubricating coating is reduced by about 8-20 times, and the wear rate is reduced by 3-20 times.
In addition, the complexing film formed on the metal surface by the organic acid can effectively prevent the metal from further corrosion, thereby improving the corrosion resistance of the metal.
The natural organic acid adopted by the invention is widely existed in various plants, has less pollution to the environment, is safer to the user and meets the requirement of green tribology; the solid lubricating coating is prepared by in-situ coating, the preparation method is simple, the cost is lower, and the large-scale production is easy; the solid lubricating coating prepared by the invention has wide application prospect in the fields of transportation, biological medical treatment, aerospace and the like.
Drawings
FIG. 1 is a scanning electron micrograph of the surface topography of the solid lubricating coating of example 1;
FIG. 2 is a graph of the coefficient of friction of the solid lubricating coating of example 1 as a function of time;
FIG. 3 is a graph of the coefficient of friction of the solid lubricating coating of example 2 as a function of time;
FIG. 4 is a graph of the coefficient of friction of the solid lubricating coating of example 3 as a function of time;
FIG. 5 is a graph showing the change with time of the friction coefficient of the metallic material in comparative example 1;
FIG. 6 is a graph of the tribological performance of the liquid lubricant prepared in comparative example 2;
FIG. 7 is a bar graph of the tribological properties of the solid lubricating coatings prepared in examples 1, 4-9;
FIG. 8 is a bar graph of the tribological properties of the solid lubricating coatings prepared in examples 1, 10-14;
FIG. 9 is an optical topography of the metallic material with solid lubricant coating prepared in example 1 after being left for 7 days.
Detailed Description
The invention provides a preparation method of a solid lubricating coating, which comprises the following steps:
coating the natural organic acid dispersion liquid on the surface of a metal substrate, and performing a complexing reaction to obtain a solid lubricating coating;
the mass concentration of the natural organic acid dispersion liquid is 20-80%; the time of the complex reaction is 5-30 min.
In the present invention, unless otherwise specified, all the required starting materials for the preparation are commercially available products well known to those skilled in the art.
In the present invention, the natural organic acid in the natural organic acid dispersion preferably includes at least one of phytic acid, tannic acid, citric acid, oxalic acid, tartaric acid and salicylic acid, and more preferably phytic acid, tannic acid or citric acid; when the natural organic acids are more than two of the natural organic acids, the proportion of different natural organic acids is not particularly limited, and any proportion can be adopted.
In the invention, the dispersing agent used for the natural organic acid dispersing liquid is preferably water or ethanol water solution; the concentration of the ethanol aqueous solution is preferably 50wt%.
In the present invention, the preparation method of the natural organic acid dispersion preferably includes: dispersing natural organic acid into a dispersing agent, and carrying out ultrasonic treatment on the obtained mixed solution for 10-30 min to obtain a natural organic acid dispersion solution; the time of the ultrasonic treatment is preferably 15 to 20min. The process of the ultrasonic treatment is not particularly limited in the present invention, and a uniformly dispersed dispersion can be obtained according to a process well known in the art.
In the present invention, the mass concentration of the natural organic acid dispersion is preferably 20 to 80%, more preferably 30 to 70%, and still more preferably 40 to 60%.
In the present invention, the coating is preferably performed by dropping, spin coating, spray coating or dipping. The specific process of the coating is not particularly limited in the present invention, and the coating may be uniformly applied according to a process well known in the art.
The specific dosage of the natural organic acid dispersion liquid is not specially limited, and the natural organic acid dispersion liquid can be adjusted according to different coating modes; when the coating mode is the dripping coating mode, the dosage of the natural organic acid dispersion liquid is preferably 0.016-0.08L/m by taking the surface area of the metal substrate as a reference 2 More preferably 0.032L/m 2 (ii) a When the coating mode is spin coating, the dosage of the natural organic acid dispersion liquid is preferably 0.048-0.128L/m based on the surface area of the metal substrate 2 More preferably 0.08L/m 2 The rotation speed of spin coating is preferably 500 to 2000rpm, more preferably 600rpm; when said coating is appliedWhen the method is impregnation, the dosage of the natural organic acid solution is not particularly limited, and the metal substrate can be completely impregnated.
In the present invention, the metal substrate preferably includes at least one of copper, GCr15 bearing steel, 304 stainless steel, titanium, aluminum, magnesium, zinc, chromium, and nickel; when the metal substrates are more than two of the metal substrates, the proportion of different types of metal substrates is not particularly limited, and the proportion can be any. The specific source and specification of the metal substrate are not particularly limited in the present invention, and the specification can be obtained according to the sources known in the art and adjusted according to the actual requirements.
In the present invention, the time of the complexing reaction is 5 to 30min, preferably 10 to 25min, and more preferably 15 to 20min.
In the present invention, a complex reaction occurs between the natural organic acid and the metal substrate, thereby forming a complex film on the metal surface. Taking phytic acid and steel as examples, the phytic acid and iron can generate a complexing reaction (shown in the following formula 1) to generate a phytic acid metal complexing film (shown in the figure 1), so that the contact area between metal friction pairs can be reduced in appearance, a transfer film is easily generated on the metal surface in the friction process, and the direct contact of the steel-steel friction pairs is avoided, thereby reducing friction and abrasion; chemically, when natural organic acid is phytic acid, P element is introduced into the metal surface under the action of the phytic acid, and the tribological performance of the metal surface can be greatly improved.
In the present invention, after the completion of the complexing reaction, it is preferable to remove the natural organic acid dispersion liquid on the surface of the obtained metal material, and to obtain a solid lubricating coating after washing and drying are sequentially performed. In the present invention, the manner of removing the natural organic acid dispersion is preferably wiping; the reagent used for washing is preferably absolute ethyl alcohol, and the drying mode is preferably air drying. The specific processes of the wiping and washing are not particularly limited in the present invention, and may be performed according to a process well known in the art.
In the present invention, the thickness of the solid lubricating coating is preferably 50 to 200. Mu.m, more preferably 65 to 100. Mu.m, and still more preferably 70 to 80 μm.
The invention provides the solid lubricating coating prepared by the preparation method in the technical scheme.
The invention provides application of the solid lubricating coating in the technical scheme in the fields of industry, transportation, biological medicine or aerospace. The method of the present invention is not particularly limited, and the method may be applied according to a method known in the art.
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It should be apparent that the described embodiments are only some embodiments of the present invention, and not all 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
Weighing 7g of phytic acid, dispersing the phytic acid into 3g of deionized water, and carrying out ultrasonic treatment on the obtained mixed solution for 20min to obtain a phytic acid solution with the mass concentration of 70%;
transferring 20 μ L of the phytic acid solution by using a liquid transfer gun, and dripping the phytic acid solution on the surface (0.032L/m) of GCr15 bearing steel (length and width both 2.5 cm) material 2 ) Uniformly dispersing the phytic acid solution on the surface of the bearing steel, wiping off the residual phytic acid solution on the surface of the material after the phytic acid solution reacts with the bearing steel for 10min, repeatedly washing the surface by using absolute ethyl alcohol, and drying in the air to form a solid lubricating coating (the thickness is 50 microns) on the surface of the bearing steel.
Example 2
Weighing 6g of tannic acid, dispersing into 4g of 50wt% ethanol water solution, and performing ultrasonic treatment on the obtained mixed solution for 30min to obtain a tannic acid solution with the mass concentration of 60%;
50 μ L of the above tannic acid solution was spin-coated on the surface of a copper block (length: 3cm, width: 2 cm) to uniformly disperse the tannic acid solution on the surface of the copper block (0.08L/m) 2 ) Of the spin coatingThe rotating speed is 600rpm; after the tannic acid solution and the copper block react for 20min, wiping off the residual tannic acid solution on the surface of the material, and repeatedly washing the surface by adopting an absolute ethyl alcohol solution. After air drying, a solid lubricating coating (thickness 70 μm) was formed on the surface of the copper block.
Example 3
Weighing 3g of citric acid, dispersing into 7g of deionized water, and carrying out ultrasonic treatment on the obtained mixed solution for 15min to obtain a citric acid solution with the mass concentration of 30%;
soaking 304 stainless steel (length and width both 3 cm) in the citric acid solution for 5min, taking out the stainless steel sheet from the citric acid solution, wiping off the residual citric acid solution on the surface of the material, repeatedly washing the surface with absolute ethanol solution, and air drying to form a solid lubricating coating (thickness of 65 μm) on the stainless steel surface.
Examples 4 to 9
The only difference from example 1 is: the concentrations of the phytic acid solutions were 20%, 30%, 40%, 50%, 60% and 80%, which were in this order given in examples 4 to 9.
Examples 10 to 14
The only difference from example 1 is: the reaction time of the phytic acid solution and the bearing steel was 5min, 15min, 20min, 25min and 30min in this order, and examples 10 to 14 were made in this order.
Comparative example 1
GCr15 bearing steel (2.5 cm in both length and width) was used as a metal material without solid lubricant coating preparation.
Comparative example 2
0.5g of tannic acid was added to an aqueous solution (30 wt% in PEG 8000) of 7.5g of a polyethylene glycol (PEG 8000) lubricant, and then the mixed solution was subjected to ultrasonic treatment for 20min to be sufficiently dissolved and uniformly mixed to obtain a liquid lubricant.
Characterization and Performance testing
1) The scanning electron microscope of the surface topography of the solid lubricating coating prepared in example 1 is shown in fig. 1, and a coating with a scale-like structure is formed on the metal surface.
2) Solid lubricating coating prepared in example 1 by using friction wear testerThe friction performance of the bearing is tested, the upper friction pair is a bearing steel ball with the diameter of 6mm, the lower friction pair is the bearing steel (the length and the width are both 2.5 cm) adopted in the embodiment 1, and a layer of solid lubrication coating generated by the complexation reaction of the phytic acid and the metal exists on the surface of the bearing steel. The load used in the friction test was 2N, the sliding frequency was 1Hz, and the sliding amplitude was 2mm. The real-time change curve of the friction coefficient of the solid lubricating coating prepared in example 1 is shown in fig. 2. As can be seen from fig. 2, the friction coefficient of the solid lubricating coating was about 0.05 after the friction test of 2400s, and the calculated wear rate was 1.2 × 10 -6 mm 3 ·N -1 ·m -1 。
3) The friction performance of the solid lubricating coating prepared in example 2 was tested by a friction and wear tester, where the upper friction pair was a bearing steel ball with a diameter of 6mm, the lower friction pair was a copper block (length 3cm, width 2 cm) used in example 2, and a green solid lubricating coating generated by a complex reaction of tannic acid and metal existed on the surface of the copper block. The load used in the friction test was 4N, the slip frequency was 2Hz, and the slip amplitude was 2mm. The real-time change curve of the friction coefficient of the solid lubricating coating prepared in example 2 is shown in fig. 3. As can be seen from FIG. 3, the coefficient of friction of the solid lubricating coating was varied in the range of 0.07 to 0.09 during the 2400s friction test, and the wear rate was calculated to be 2.5X 10 -6 mm 3 ·N -1 ·m -1 。
4) A friction wear testing machine is adopted to test the friction performance of the solid lubricating coating prepared in the embodiment 3, the upper friction pair is a bearing steel ball with the diameter of 6mm, the lower friction pair is 304 stainless steel (the length and the width are both 3 cm) adopted in the embodiment 3, and a layer of green solid lubricating coating generated by the complexation reaction of citric acid and metal exists on the surface of the lower friction pair. The load used in the friction test was 3N, the slip frequency was 1.5Hz, and the slip amplitude was 2mm. The real-time change curve of the friction coefficient of the green solid lubricating coating prepared in example 3 is shown in fig. 4. As can be seen from FIG. 4, the coefficient of friction of the solid lubricating coating after the 1500s friction test was about 0.12, which was calculated to be a wear rate of 7.6X 10 -6 mm 3 ·N -1 ·m -1 。
5) The friction performance between metals of comparative example 1 without the solid lubricating coating was tested by a friction and wear tester, wherein the upper friction pair was a bearing steel ball having a diameter of 6mm, and the lower friction pair was the bearing steel used in comparative example 1 (both length and width were 2.5 cm). The load used in the friction test was 2N, the slip frequency was 1Hz, and the slip amplitude was 2mm. The real-time change curve of the friction coefficient of comparative example 1 is shown in fig. 5. As can be seen from FIG. 5, after the 2000s friction test, the coefficient of friction was about 0.77, and the calculated wear rate was 2.4X 10 -5 mm 3 ·N -1 ·m -1 。
6) The liquid lubricant prepared in comparative example 2 was tested for tribological properties, in which the upper friction pair was a bearing steel ball having a diameter of 6mm, the lower friction pair was a bearing steel (2.5 cm in both length and width), the applied load was 2N, the sliding frequency was 1Hz, the sliding amplitude was 2mm, the change in the number of tribological systems with time is shown in FIG. 6, and it can be seen from FIG. 6 that the liquid lubricant prepared in comparative example 2 had a friction coefficient of 0.11 to 0.12, and the calculated wear rate was 1.3X 10 -5 mm 3 ·N -1 ·m -1 The liquid lubricant shows that the wear rate of the liquid lubricant on the metal surface is higher, which shows that the solid lubricating coating prepared by the method of the invention has better friction performance for a metal friction pair.
7) Effect of the Phytic acid content on Friction behavior of solid lubricating coatings
The solid lubricating coatings prepared in examples 1, 4 to 9 were tested for tribological properties using a load of 2N, a sliding frequency of 1Hz and a sliding amplitude of 2mm. As shown in fig. 7, the friction coefficient and the wear rate of the solid lubricating coating are continuously reduced as the concentration of phytic acid is increased, but when the concentration of phytic acid is too high, the reaction to the metal surface is too severe, so that the surface of the coating is peeled off due to friction, and the friction coefficient and the wear rate are increased.
8) The solid lubricating coatings prepared in examples 1, 10 to 14 were tested for tribological properties using a load of 2N, a sliding frequency of 1Hz and a sliding amplitude of 2mm. The experimental result is shown in fig. 8, when the reaction time of the phytic acid and the metal is 10min, the friction coefficient and the abrasion loss are lowest, and if the reaction time of the phytic acid and the metal is too long, the prepared coating is easy to abrade during the friction process to generate abrasive dust, so that the tribological performance of the coating is reduced.
9) After the metal material with the solid lubricating coating prepared in example 1 is placed for 7 days, an optical microscope test is carried out, and the obtained result is shown in fig. 9, as can be seen from fig. 9, no obvious corrosion occurs on the metal surface, which indicates that the complexing film formed on the metal surface by the phytic acid can effectively prevent the metal from further corrosion.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (9)
1. A method for preparing a solid lubricating coating, comprising the steps of:
coating the natural organic acid dispersion liquid on the surface of a metal substrate, and performing a complexing reaction to obtain a solid lubricating coating;
the mass concentration of the natural organic acid dispersion liquid is 20-80%; the time of the complex reaction is 5-30 min;
the natural organic acid in the natural organic acid dispersion liquid comprises at least one of phytic acid, citric acid, oxalic acid, tartaric acid and salicylic acid.
2. The method according to claim 1, wherein the dispersant used in the natural organic acid dispersion is water or ethanol.
3. The method of claim 1, wherein the metal substrate comprises at least one of copper, GCr15 bearing steel, 304 stainless steel, titanium, aluminum, magnesium, zinc, chromium, and nickel.
4. The method according to claim 1, wherein the natural organic acid dispersion has a mass concentration of 30 to 70%.
5. The method according to claim 1, wherein the time for the complexing reaction is 10 to 25min.
6. The production method according to claim 1, wherein after the completion of the complexing reaction, the natural organic acid dispersion liquid on the surface of the metal material is removed, and after washing and drying are sequentially performed, a solid lubricating coating is obtained.
7. The production method according to claim 1, wherein the thickness of the solid lubricating coating is 50 to 200 μm.
8. A solid lubricating coating produced by the production method according to any one of claims 1 to 7.
9. Use of a solid lubricating coating according to claim 8 in the transportation, biomedical or aerospace field.
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| CN202210561423.5A CN115261100B (en) | 2022-05-23 | 2022-05-23 | Solid lubricating coating with antifriction and wear-resistant performance and preparation method and application thereof |
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| CN202210561423.5A CN115261100B (en) | 2022-05-23 | 2022-05-23 | Solid lubricating coating with antifriction and wear-resistant performance and preparation method and application thereof |
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| CN115261100B true CN115261100B (en) | 2023-03-03 |
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| US3983270A (en) * | 1973-10-26 | 1976-09-28 | Rockwell International Corporation | Composition for boundary lubricant and method |
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