TWM501441U - Melanization transmission element with electroplated cobalt chromium oxide composite coating layer - Google Patents

Abstract

The present disclosure provides a melanization transmission element with electroplated cobalt chromium oxide composite coating layer. The electroplated cobalt chromium oxide is coated on the surface of element substrate of the sliding transmission element by means of trivalent chromate electroplating solution and a resin layer is coated on the metallic ceramic coating layer. The formed cobalt chromium oxide composite coating layer is major consist of chromium, cobalt, oxygen, hydrogen and phosphorus that composes with chromium oxide and cobalt oxide with the thickness less than 3[mu]m. Thus, a dark brown color with gray value scale (L%) between 25 and 45 that is ready for using in linear slide rail and ball screw.

Description

Drive element coated with chrome-cobalt-cobalt composite coating

This creation is about a transmission component coated with chrome-cobalt-cobalt composite coating, especially the chrome-cobalt-cobalt composite coating formed by electroplating on the substrate of the transmission component, resulting in dense, corrosion-resistant and brownish black to black. Color, supply such as linear slides, ball screws and other transmission components.

Regardless of consumer products such as automobiles, information, optoelectronics, and telecommunications, or the food industry, transportation industry, or green energy industry that rely on people's livelihood, it is necessary to rely on the machine tools of machinery and equipment as the basis for manufacturing; The transmission mechanism is servo motor, controller, bearing, gear and transmission components. Ball guide, linear slide or ball screw are the main applications of transmission components. In the transmission component, the linear slide is a rolling guide, and the slider is easily slid on the slide rail to perform high-precision linear transmission on the platform loaded on the slider. The ball screw (Ballscrew) or ball guide is a high-precision linear transmission of the components connected to the nut by the movement between the nut and the screw. Since the ball guide, linear slide or ball screw has the characteristics of high positioning accuracy, high life, low pollution and high-speed forward and reverse transmission and conversion transmission, it has become the positioning and measurement system of the precision technology industry and precision machinery industry. One of the important components on the top.

Due to the high precision of the manufacture or assembly of ball guides, linear slides or ball screws, slight dimensional differences or plating on ball guides, linear slides, ball screws, sliders or nuts Thickness (or surface treatment layer, etc.) exceeds tolerance tolerances, which can cause slippage, impediment, or loss of precision. The surface treatment layer used in the conventional ball lead screw group and the linear slide group is mainly an electroplated chromium layer, an electroplated nickel layer, an electroless nickel plating layer, and a black oxide. Treatment, zinc phosphate (manganese) treatment, etc.; however, the industry chooses these surface treatment layers to face excessive thickness, uneven plating, non-abrasion of the plating layer, poor adhesion of the coating layer or insufficient degree of blackening problem.

In addition to the surface treatment method described above, a metallic ceramic is a ceramic-like structure in which a non-metal element is mixed with a metal element to have both a metal property and a ceramic property, for example, Some of the co-structures have the hardness of ordinary ceramics and very good corrosion resistance, or both metallic luster and electrical conductivity, or the color of ceramics. The method commonly used is to co-sinter non-metal elements with metal elements. Forming, such as metal nitrides (such as titanium nitride (TiN), etc.), metal carbides (such as graphite, tungsten carbide, zirconium carbide, chromium carbide, tantalum carbide, etc.), or such as metal oxides (such as chromium oxide, tungsten oxide) , cobalt oxide, etc., other boride, telluride, etc.; these metal nitrides have been widely used in wear-resistant components, turning tools, heat exchangers, engine components, biomedical, military and space.

In many metallized ceramic molding methods, the formation of metallized ceramics on a substrate by using an electroplating method is the quickest and most convenient, the coating is smooth and uniform, and the mechanical properties of the workpiece are not changed. For environmental protection and safety considerations, Taiwan Patent Publication No. TW201339373 discloses the use of fluoroantimonic acid (H ₂ SiF ₆ ), nitrate, permanganate blackening agent, mineral acid cobalt co-depositing agent, phosphate mis-agent Electroplating with a relatively environmentally friendly trivalent chromium, electroplating on a substrate to form an amorphous phase structure of a trivalent chromium oxide plating layer, the oxide plating layer having a higher degree of ceramization than other technologies, blackening A higher degree. However, for a number of practical applications, a black electroplated layer with a deeper blackening degree is difficult to coat other dark coloring paints except dark black, and it is difficult to cover a black electroplated layer having a deep blackening degree due to a thin coating layer; In order to achieve the purpose of blackening, how to develop other more suitable trivalent chromium electroplated metallized ceramics, so that the coating can have wear resistance, corrosion resistance, appropriate blackening degree and thinner thickness. On the transmission element.

In view of the above-mentioned problems of the prior art, one of the main purposes of the present invention is to provide a transmission component coated with a chrome-cobalt-cobalt composite coating, which is made of a component substrate and plated on the component substrate. The method comprises electroplating a layer of chrome-cobalt-cobalt composite coating. The material of the component substrate is selected from the group consisting of iron, nickel, chromium, molybdenum, copper, or iron, nickel, chromium, molybdenum, Copper alloy.

The chromium-cobalt-cobalt composite plating layer is formed on the element substrate by electroplating, and is composed of chromium element, oxygen element, hydrogen element, cobalt element and phosphorus element, and is an amorphous phase structure; the composition includes at least the following: chromium (Cr), chromium oxide (Cr ₂ O ₃ ), chromium hydroxide (Cr(OH) ₃ ), cobalt (Co) and cobalt oxide; wherein the cobalt oxide is cobalt trioxide (Co ₃ O ₄ ) or cobalt sesquioxide (Co ₂ O ₃ ) or a combination thereof; the thickness of the chromium oxide cobalt composite coating is very thin and dense, and the thickness thereof is 0.5 to 3 μm, and the thickness may be 2 μm or less for different applications; the chromium oxide cobalt composite plating on the plating is brown Between black and black, the gray value scale (L%) is between 25 and 45; wherein the gray scale value is the degree of black measurement, using 100 gray scales, the gray scale brightness from gray The order value is 0 (black) to the gray level value of 99 (white). The thickness of the chrome-cobalt-cobalt composite plating layer refers to the average thickness of the plating layer, and does not refer to the thickness of the specific measurement point, which is the same as the following, and will not be described again.

Since the chrome-cobalt-cobalt composite coating consists of an amorphous phase structure composed of chromium, oxygen, hydrogen, cobalt and phosphorus, it contains a higher content of chromium oxide (Cr ₂ O ₃ ) and more. The ratio of cobalt trioxide (Co ₃ O ₄ ) causes the chromia-cobalt-cobalt composite coating to be ceramicized, so that the plating layer can have a high gray value scale (L%) of at least 25 to 45.

Furthermore, the transmission element of the chrome-cobalt-cobalt composite coating proposed by the present invention has a plurality of groove-like microstructures on the surface of the chrome-cobalt-cobalt composite coating, and the width of the groove-like microstructures is substantially less than 200 nm and at least one groove-like shape The width of the microstructure is less than 100 nm. The groove-like microstructure is a groove caused by gas generated on the surface of the cathode when the chrome-cobalt-cobalt composite coating is formed. Due to the inconsistent direction of the grooves, the light incident on the surface is difficult to reflect and oxidize. The chrome-cobalt composite coating has a lower gray scale value and a higher degree of blackening. The 80% width W ₈₀ of the groove-like microstructure of the chromia-cobalt composite plating layer is less than 10 μm, and the light incident on the surface is blocked by the groove-like microstructure by using a small width of the groove-like microstructure. It is not easy to reflect, so that the chrome-cobalt-cobalt composite coating has a lower gray scale value and a higher degree of blackening. Where W ₈₀ is any photomicrography (such as TEM), the width W of the grooved microstructure is measured, and the measured data of each measurement is from small to large, and the width from small to large is 80%. W ₈₀ width, which is the maximum width of 80% of the measured data.

In the transmission electron microscopy (TEM) image of the subsequent embodiment, the transmission of the coated chromium oxide cobalt composite coating can be seen. The element forms a groove-like microstructure on the surface of the chrome-cobalt-cobalt composite coating, and the groove is in the form of a very shallow depth, so that the chrome-cobalt-cobalt composite coating still retains good corrosion resistance, and the groove-like microstructure allows irradiation of chromium oxide. The light on the surface of the cobalt composite coating is not easily refracted, and the gray value scale (L%) of the chrome-cobalt-cobalt composite coating is further reduced.

Further, the present invention proposes a transmission component coated with a chrome-cobalt-cobalt composite coating, wherein the chrome-cobalt-cobalt composite coating further comprises: chromium phosphide (CrP) and cobalt phosphide, wherein the cobalt phosphide is divalent cobalt Or one of trivalent cobalt phosphides (CoP, Co ₂ P ₃ ) or a combination thereof.

Further, in the present invention, the transmission component of the chromia-cobalt-cobalt composite coating is coated, and the structure of the transmission component of the chrome-cobalt-cobalt composite coating further comprises a resin layer attached to the chrome-cobalt composite plating layer. All or a part; the resin layer may be cerium oxide (SiO ₂ ), polysiloxane, perfluorinated chemicals (PFCs), fluororesin, phenolic resin One or a combination of resins, acrylic resin (or polycarboxyethylene resin), or polycarboxyethylene silicon modified resin (not known as polycarboxyethylene modified resin) is not limited.

For different applications, pigments or matting agents of various colors may be added to the aforementioned resins according to requirements to exhibit different colors or matt colors, which are not limited. Moreover, since the color of the chrome-cobalt-cobalt composite coating is brownish-black to black, when a light-colored pigment other than black and a thin resin layer coating are used, the color of the chrome-cobalt-cobalt composite coating can be completely covered; When a pigment is commonly known as a varnish, a transparent or translucent resin layer can reveal the brownish black color of the chrome-cobalt-cobalt composite coating to form a noble color and expand the application.

Another main purpose of the present invention is to provide a transmission component coated with a chrome-cobalt-cobalt composite coating. The transmission component is made of a component substrate, and an interposer is coated on the surface of the component substrate, and a layer is plated on the interposer. The chrome-cobalt-cobalt composite coating; wherein the component substrate is made of metal or non-metal, and the interposer is composed of iron, nickel, chromium, copper, silver, gold or a metal thereof, and is electroplated, electroless, One of or a combination of vapor deposition (including PVD, CVD, etc.) is formed.

The chromium-cobalt-cobalt composite coating is formed on the interposer by electroplating, consisting of chromium element, oxygen element, hydrogen element, cobalt element and phosphorus element, and is an amorphous phase structure; the composition includes the following: chromium (Cr ), chromium oxide (Cr ₂ O ₃ ), chromium hydroxide (Cr(OH) ₃ ), and cobalt oxide; wherein the cobalt oxide is one of cobalt trioxide (Co ₃ O ₄ ) or cobalt dioxide (Co ₂ O ₃ ) or The combination; the thickness of the chrome-cobalt-cobalt composite coating is very thin and compact, and the thickness thereof is 0.5~3μm, and the thickness can be less than 2μm for different applications; the chrome-cobalt-cobalt composite plating on the plating is brownish black to black, and its ash The gray value scale (L%) is between 25 and 45.

Wherein, the gray scale value of the chrome-cobalt-cobalt composite coating is measured by a Spectra Scan Colorimeter, and when the gray scale value is 100%, it is expressed as all white, and when the gray scale value is 0% When expressed as all black.

Furthermore, the transmission element of the chrome-cobalt-cobalt composite coating proposed by the present invention has a plurality of groove-like microstructures on the surface of the chrome-cobalt-cobalt composite coating, and the width of the groove-like microstructures is substantially less than 200 nm and at least one groove-like shape The width of the microstructure is less than 100 nm. The groove-like microstructure is a groove caused by gas generated on the surface of the cathode when the chrome-cobalt-cobalt composite coating is formed. Due to the inconsistent direction of the grooves, the light incident on the surface is difficult to reflect and oxidize. The chrome-cobalt composite coating has a lower gray scale value and a higher degree of blackening. The 80% width W ₈₀ of the groove-like microstructure of the chromia-cobalt composite plating layer is less than 10 μm, and the light incident on the surface is blocked by the groove-like microstructure by using a small width of the groove-like microstructure. It is not easy to reflect, so that the chrome-cobalt-cobalt composite coating has a lower gray scale value and a higher degree of blackening. Where W ₈₀ is any photomicrography (such as TEM), the width W of the grooved microstructure is measured, and the measured data of each measurement is from small to large, and the width from small to large is 80%. W ₈₀ width, which is the maximum width of 80% of the measured data.

Further, the present invention proposes a transmission component coated with a chrome-cobalt-cobalt composite coating, wherein the chrome-cobalt-cobalt composite coating further comprises: chromium phosphide (CrP) and cobalt phosphide, wherein the cobalt phosphide is divalent cobalt Or one of trivalent cobalt phosphides (CoP, Co ₂ P ₃ ) or a combination thereof.

Furthermore, the chrome-cobalt-cobalt composite coating of the coated chromium oxide-cobalt composite coating proposed by the present invention has good corrosion resistance, and its weather resistance is at least 96 hours according to the ASTM B-117 5% salt spray test standard.

Further, the transmission component of the coated chromium oxide cobalt composite coating proposed by the present invention may further adhere a resin layer on the chrome-cobalt-cobalt composite plating layer, and the resin layer may be cerium oxide (SiO2) or polyoxy siloxane compound ( Polysiloxane), perfluorinated chemicals (PFCs), fluororesin, phenolic resins, acrylics (or One or a combination of a polycarboxyethylene resin, or a combination of a polycarboxyethylene resin, or a combination thereof, is not limited. Since the chrome-cobalt-cobalt composite coating has good coating adhesion, the adhesion of the resin layer is 4B or more according to the ASTM-D3359 test.

For different applications, pigments, matting agents, varnishes, and the like of various colors may be added to the aforementioned resins as needed; as described above.

According to the above description, a transmission component coated with a chrome-cobalt-cobalt composite coating can have one or more of the following advantages:

(1) This creation takes into account the electroplating method disclosed in Taiwan Patent Publication No. TW201339373. After painstaking research and repeated trials to change the formulation composition, the cobalt oxide-cobalt composite coating was successfully added with cobalt oxide, and the electroplating disclosed in Taiwan Patent Publication No. TW201339373 was improved. The disadvantage of insufficient blackening of the coating. In order to increase the degree of blackening, the present invention more progressively forms more content ratio of chromium oxide (Cr ₂ O ₃ ) and more content ratio of eutectic cobalt trioxide (Co ₃ O ₄ ), so that the coating can have A high gray value scale (L%) of at least 25 to 45 can be applied to sliding elements such as slide rails and screws.

(2) As the creation changes the black plating formed by the conventional trivalent chromium plating more progressively, in addition to the purpose of ceramization, a groove-like microstructure is formed on the surface of the chrome-cobalt-cobalt composite coating more progressively. The shape is extremely shallow, and there is no deep and element substrate, so that the chrome-cobalt-cobalt composite coating has good corrosion resistance, and the groove-like microstructure makes the light irradiated on the surface of the chrome-cobalt-cobalt composite coating less refracting, and the lowering is further reduced. The gray value of the chrome-cobalt-cobalt composite coating (L%) is more suitable for sliding elements such as slide rails and screws.

(3) The chrome-cobalt-cobalt composite coating of the present invention has good paint adhesion, and provides a good coating substrate by the characteristics of the groove on the surface of the chrome-cobalt-cobalt composite coating and the metallized ceramic of chrome-cobalt oxide. The resin layer has good adhesion and can reach the ASTM-D3359 hundred grid test 4B or more.

(4) The color of the chrome-cobalt-cobalt composite coating of this creation is from brownish black to black. When using light pigment and thin resin layer coating, it can completely cover the color of chrome-cobalt-cobalt composite coating, and even form noble Color can be expanded.

To enable a better understanding of the features and technical content of this creation, please see below The detailed description of the present invention and the accompanying drawings are merely for the purpose of illustration and description.

1‧‧‧element substrate

2‧‧‧Inter layer

3‧‧‧electroplated cobalt chromium oxide composite coating layer

31‧‧‧ Grooved microstructure

4‧‧‧resin layer

11‧‧‧linear slide rail set

111‧‧‧slide rail (slide rail)

112‧‧‧Sliding block

12‧‧‧ball screw set

121‧‧‧sctus (ball screw)

122‧‧‧ Nuts

W‧‧‧width of grooved microstructure

Figure 1 is a schematic view of the chrome-cobalt-cobalt composite coating of the present invention; Figure 2 is an elemental analysis diagram of the chromia-cobalt-cobalt composite coating of the present invention; and Figure 3 is a transmission component coating of the coated chromia-cobalt-cobalt composite coating. The composition analysis map of different depths; the fourth figure is a schematic diagram of the first embodiment of the transmission component of the coated chromium oxide cobalt composite coating; the fifth figure is the third implementation of the transmission component of the coated chromium oxide cobalt composite coating FIG. 1 and FIG. 6 are schematic diagrams 2 of the third embodiment of the transmission component of the coated chromium oxide cobalt composite coating.

Attachment of the figure: Attachment I is a photograph of the surface topography of the chromic-cobalt-cobalt composite coating produced by the penetrating microscope. (Part I); Figure II of the annex is the penetrating type of the chrome-cobalt-cobalt composite coating. Photomicrograph of the surface of the microscope (2); Annex III is the photomicrograph of the chromic-cobalt-cobalt composite coating of the chromic-cobalt composite coating. The photo of the groove produced by the gas during electroplating (1); Figure IV is a photograph of the groove generated by the gas during the electroplating of the chromic-cobalt-cobalt composite coating of the present invention. Figure V of the annex is a photograph of the cross section of the chromia-cobalt composite coating of the creation.

The foregoing and other technical contents, features and advantages of the present invention will be apparent from the following description of the drawings and the detailed description.

The technique of the present invention is in a trivalent chromium plating solution in which a covalent deposition agent of a trivalent chromium salt, a binder, a blackening additive and a cobalt ion is dissolved; when the component substrate 1 of the sliding member starts to be plated, Reduction of metallic chromium to oxidize and phosphate chromium, reduction of metallic cobalt, oxidation or phosphating of cobalt, co-deposition to form chrome-cobalt-cobalt composite coating 3, see Figure 1, Figure 1 is a chrome-cobalt oxide Schematic diagram of the composite plating layer, the chromium oxide cobalt composite plating layer 3 is composed of chromium element, oxygen element, cobalt element, hydrogen element, and phosphorus element.

The component substrate 1 of the tool may be metal or non-metal. When the component substrate 1 is a metal, such as iron, nickel, chromium, molybdenum, copper or an alloy thereof (such as high carbon steel, chrome molybdenum steel, stainless steel, etc.) At this time, the chromium oxide cobalt composite plating layer 3 can be formed by direct plating on the element substrate 1. In addition, when the element substrate 1 is a metal that is not easily plated, such as titanium or aluminum, iron, nickel, and chromium may be formed on the element substrate 1 by electroplating, electroless plating, vapor deposition, vapor deposition, physical deposition, or the like. An interposer 2 of copper, silver, gold or a metal thereof; and a chromium oxide cobalt composite plating layer 3 formed on the interposer 2 by the above method.

For different applications, the component substrate 1 of the sliding element may be metal or non-metal, and when the component substrate 1 is non-metallic, such as a plastic material, a ceramic material, a glass material or a fiber material, the component substrate 1 may be first Forming an interposer 2 of iron, nickel, chromium, copper, silver, gold or a metal thereof by electroplating, electroless plating, vapor deposition, vapor deposition, physical deposition, etc.; forming on the interposer 2 by the above method Chromium oxide cobalt composite plating 3. For different application elements, when the substrate 1 is made of metal, iron, nickel, chromium, copper, silver, gold may be formed on the element substrate 1 by electroplating, electroless plating, vapor deposition, vapor deposition, physical deposition, or the like. An intervening layer 2 of one metal or alloy thereof.

The trivalent chromium plating method disclosed in Taiwan Patent Publication No. TW201339373, after the long-term study by the creator of the trivalent chromium plating solution, adjusts the degree of blackening of the plating layer from brownish black to black to meet the specific application, and the creation uses The composition of the trivalent chromium plating solution is shown in Table 1 or Table 2 can be used. Adjusting the composition and concentration ratio of the composition of the trivalent chromium plating solution, the color of the chromium oxide cobalt composite plating layer 3 can be adjusted, and the gray scale value (L%) is between 25 and 45.

Thus, a blackening agent of fluoroantimonic acid (H ₂ SiF ₆ ), a nitrate or a cerium salt, a co-depositing agent of a mineral acid cobalt, a complexing agent of a halogen salt, and an environmentally friendly trivalent chromium plating are used in the element base. The material 1 is electroplated to form an oxidized chromium-cobalt composite plating layer 3 having an amorphous phase structure. See Fig. 2, Fig. 2 is an elemental analysis diagram of the chrome-cobalt-cobalt composite coating of the present invention; see also Fig. 3, and Fig. 3 is the coating layer of the chrome-cobalt-cobalt composite coating of the present invention. The composition analysis spectrum is obtained from Fig. 2 and Fig. 3. The chromium oxide cobalt composite coating 3 is mainly composed of oxygen element, chromium element and cobalt element, and there is still hydrogen element, but the atomic percentage of hydrogen element is At% (atomic) The ratio can not be analyzed; the second is composed of phosphorus; after the chemical analysis of the chromium-cobalt-cobalt composite coating 3, the chromium-cobalt-cobalt composite coating 3 consists of the following: (1) chromium metal (Cr) and oxidation Chromium (Cr ₂ O ₃ ), and a small amount of oxygen and chromium compounds of different compositions; and the higher the content of chromium oxide (Cr ₂ O ₃ ), the higher the degree of blackening of the chromium-cobalt-cobalt composite coating 3 (2) a trivalent chromium hydroxide (Cr(OH) ₃ ) and chromium phosphide (CrP), and a small amount of a different composition of a hydroxide and chromium compound, a compound of phosphorus and chromium; (3) cobalt (Co) with cobalt oxide (Co ₃ O ₄ ), and a small amount of oxygen and cobalt compounds of different composition, such as oxygen of divalent cobalt or trivalent cobalt The compound (cobalt trioxide Co ₂ O ₃ , cobalt oxide CoO), etc.; the higher the content of tricobalt tetroxide, the higher the degree of blackening of chrome-cobalt-cobalt composite coating 3; (4) cobalt hydroxide (Co(OH) ₃ ) with cobalt phosphide (CoP), and hydroxide of divalent cobalt or trivalent cobalt (such as Co(OH) ₂ ), divalent cobalt or phosphide of trivalent cobalt (such as Co ₃ P ₂ ).

Please refer to the attached drawings I and II of the figure. The attached figure I and the attached figure II of the figure are the surface shapes of the transmission magnification of the transmission elements of the coated chromia-cobalt-cobalt composite coating. As a photo, the surface of the chrome-cobalt-cobalt composite plating layer 3 has a groove-like microstructure 31 in addition to the above-described four groups to constitute an amorphous phase structure. With the groove-like microstructure 31, the sliding element of the chromia-cobalt-cobalt composite plating layer 3 of the present invention makes the light irradiated on the surface of the chrome-cobalt-cobalt composite plating layer 3 hard to be refracted, and the gray scale value of the chromia-cobalt-cobalt composite plating layer 3 is further reduced. (gray value scale) (L%); where the grayscale value is the degree of black measurement, using 100 gray scales, the grayscale brightness from grayscale value 0% (black) to grayscale value 99% (white ). In the chrome-cobalt-cobalt composite plating layer 3 of the present invention, in order to make the degree of blackening sufficient, the incident light is not easily reflected, and a groove-like microstructure is formed on the surface of the chrome-cobalt-cobalt composite plating layer 3, wherein the width W _{80 is} less than 10 μm.

Please refer to Figure III and IV of the attached figure. Figure III of the attached figure and Figure IV of the attached figure show the surface topography of the different positions of the penetrating microscope TEM shot of the coated chromium oxide cobalt composite coating. As shown in the figure, the surface of the chromia-cobalt-cobalt composite plating layer 3 has a plurality of groove-like groove-like microstructures 31 having a width of substantially less than 100 to 200 nm, or even about 20 nm. The microstructure 31 is a groove caused by gas generated on the surface of the cathode when the chrome-cobalt-cobalt composite plating layer 3 is formed. Due to the inconsistent direction of the grooves, the light incident on the surface is difficult to be reflected, and the chrome-cobalt-cobalt composite plating layer 3 is further reduced. Gray value scale (L%).

The thickness (film thickness) of the chrome-cobalt-cobalt composite plating layer 3 can be adjusted according to the plating conditions, so that the variation of the transmission component of the coated chrome-cobalt-cobalt composite coating layer before and after electroplating does not affect the mechanical precision, the chrome-cobalt-cobalt composite coating layer The film thickness of 3 is preferably 2 μm or less, or 0.25 to 2 μm; for different applications, the plating time can be extended and the plating temperature can be lowered to increase the thickness to less than 3 μm; if the plating time is increased, the thickness can be more than 5 μm. However, its adhesion will be reduced, although this is not the best coating, but it is easily achieved by the technique of this creation. The thickness (film thickness) of the chrome-cobalt-cobalt composite coating 3 can be examined by many scientific methods, or can be analyzed by photomicrograph of the cross-section of the plating layer, as shown in the attached figure V of the figure, and the figure V of the attached figure is the oxidation of the creation. Photograph of the cross section of the chrome-cobalt composite coating.

The surface hardness of chrome-cobalt-cobalt composite coating 3 is 800Hv, which can be adjusted according to the plating conditions for different applications up to 1200Hv.

The linear polarization corrosion current of the chromium oxide cobalt composite plating layer 3 is less than 1×10 ^-5 ampere, which can be adjusted according to the plating conditions for different applications up to 1×10 ^-6 ampere.

Weathering resistance of chrome-cobalt-cobalt composite coating 3, salt spray test according to ASTM B-117 in 5% sodium chloride spray weather resistance test for at least 96 hours, can be adjusted according to plating conditions for different applications up to 168 More than an hour.

Further, the transmission element of the coated chromium oxide cobalt composite coating proposed by the present invention may be further coated with a resin layer 4 on the chrome-cobalt-cobalt composite plating layer 3 (see FIG. 7), and the resin layer 4 may be cerium oxide (see FIG. 7). SiO ₂ ) based colloidal coatings (so-gel), polyoxyalkylene compound based coatings, perfluorocarbon based coatings, perfluororesin based coatings, phenolic based coatings, acrylic coatings (also known as It is an acrylic paint), an acrylic enamel-modified resin coating, etc., but various other coatings are applicable, and will not be enumerated here. Since the surface of the chromia-cobalt-cobalt composite plating layer 3 has grooves and forms a grainy rough surface, it has good coating adhesion, and the adhesion of the resin layer 3 is at least 4 B or more according to the ASTM-D3359 test.

The SiO ₂ -based colloidal coating is a film-forming material of a colloidal (so-gel) cerium oxide. The cerium oxide has high porosity, hydrophilicity and high specific surface area. It can increase hardness, wear resistance and scratch resistance, and provide surface protection of chrome-cobalt-cobalt composite coating 3.

A coating of a silane polysiloxane compound The surface of the chrome-cobalt-cobalt composite plating layer 3 is provided with abrasion resistance, lubricity, adhesion, and simple processability. Wherein, the polysiloxane coating is a coating of a decane polymer formed by copolymerization of a decane compound with a substance such as an acrylate polymer, which can enhance the surface physical properties of the chrome-cobalt-cobalt composite plating layer 3, and has a slip property. , fit, scratch resistant, smooth surface, flexibility and hydrophobicity.

Perfluorinated chemicals (PFCs) coatings, perfluorocarbons (PFCs) are an organic compound. The main characteristics of the coatings are good chemical resistance, good processability, heat resistance to 260 ° C, and high lubricating properties. The sliding element of the chrome-cobalt-cobalt composite coating 3 coated with a perfluorocarbon coating can be used for aerospace equipment, gaskets, gaskets, fire insulation tools, tanks, containers, surface coatings for 3C products, or medical equipment.

Perfluororesin coatings such as polytetrafluoroethylene (PTFE) coatings, polychlorotrifluoroethylene (PCTFE) coatings, polyvinylidene fluoride (PVDF) coatings, ethylene-tetrafluoroethylene copolymer (ETFE) coatings, Ethylene-chlorotrifluoroethylene copolymer (ECTFE) coating, polyvinyl fluoride (PVF) coating, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (commonly known as fusible polytetrafluoroethylene, PFA) coating, tetrafluoroethylene Ethylene-hexafluoropropylene copolymer (commonly known as fluoroplastic 46, FEP) coating, tetrafluoroethylene-hexafluoropropylene-perfluoroalkyl vinyl ether copolymer coating, chrome-cobalt-cobalt composite coating coated with perfluororesin coating 3 The sliding element can have excellent properties such as high and low temperature resistance, dielectric properties, chemical stability, weather resistance, non-combustibility, non-stickiness and low friction coefficient.

A phenolic resin coating is a synthetic resin formed by condensation polymerization of a phenol and an aldehyde. The sliding element of the chrome-cobalt-cobalt composite coating 3 coated with a phenolic resin coating can be hard, wear-resistant, water-resistant, moisture-resistant, and chemically resistant. , insulation and other characteristics.

The sliding element of the chrome-cobalt-cobalt composite coating 3 coated with an acrylic resin coating or an acrylic enamel modified resin coating (also known as an acrylic modified resin coating or a polycarbonylethylene modified silicone resin coating) may have a hard surface and wear resistance. It is resistant to chemical corrosion, especially in the case of good spray control. The original sliding element of the paint using acrylic enamel modified resin can achieve a hardness of 3H or more.

The following embodiments are various embodiments of the transmission element of the coated chromium oxide cobalt composite coating of the present invention, but the actual aspect is not limited thereto.

<Example 1>

Referring to FIG. 4, FIG. 4 is a schematic view showing the first embodiment of the transmission component of the coated chromium oxide cobalt composite coating, which is composed of a transmission component coated with a chrome-cobalt-cobalt composite coating to form a ball screw set. 12; the ball screw set 12 is composed of a ball screw 121 and a nut 122, and the nut 122 can be rotated along the screw 121 to produce an upward or downward sliding; in the embodiment, the screw 121 and The component substrate 1 of the nut 122 is a chrome molybdenum steel material; for the screw 121 and the nut 122, it is plated on the component substrate 1 by the present trivalent chromium plating method (the plating solution composition and operating conditions of Table 1). Chromium oxide cobalt composite coating 3, chromium oxide cobalt composite coating 3 is composed of chromium element, oxygen element, cobalt element, hydrogen element, and phosphorus element, and its composition is chromium metal (Cr), chromium oxide (Cr ₂ O ₃ ) , trivalent chromium hydroxide (Cr(OH) ₃ ), chromium phosphide (CrP), cobalt (Co), cobalt oxide (Co ₃ O ₄ ), cobalt dioxide Co ₂ O ₃ , cobalt oxide CoO , cobalt hydroxide (Co (OH) _3), cobalt phosphate (CoP), divalent cobalt hydroxide (e.g., Co (OH) _2), divalent cobalt phosphide (e.g., Co ₃ P _2); characteristics thereof Table III.

Among them, the corrosion resistance test is based on AutoLAB impedance spectrum analysis linear polarization test, the evaluation criteria are as follows: Level 1, linear polarization corrosion current (amperes) less than 1 × 10 ^-7 below, level 2, 1 × 10 ^-6 or less , grade 3, 1×10 ^-5 or less, grade 4, 1×10 ^-4 or more; salt spray test is based on ASTM B-117 weathering test of 5% sodium chloride droplets, the following examples show the same method .

In this embodiment, in order to further protect the surface of the nut 122, the chrome-cobalt composite plating layer 3 of the nut 122 is further coated with a resin layer 4 of a coating of acrylic enamel modified resin having a thickness of 5 μm or less, as shown in the drawing; The adhesion of the resin layer 4 conforms to the requirements of ASTM-D3359 Hundred Test 4B. The resin layer 4 can be selected from the screw 121, and the screw 121 is covered with a thin, wear-resistant and weather-resistant chrome-cobalt-cobalt composite coating 3, which does not affect the movement of the nut 122, and can meet the precise requirements. Moreover, the ball screw group 12 of the screw 121 and the nut 122 has a sufficient degree of blackening, and has good functionality in addition to the appearance.

<Example 2>

This embodiment is the same as the first embodiment. For the screw 121 and the nut 122, the chrome-cobalt-cobalt composite plating layer 3 is electroplated on the component substrate 1 by the plating solution composition and operating conditions of the present invention. four.

<Example 3>

Please refer to the 5th and 6th drawings. Figure 5 is a schematic diagram of the third embodiment of the transmission component of the coated chromium oxide cobalt composite coating. The sixth figure is the transmission component of the coated chromium oxide cobalt composite coating. In the second embodiment, a linear slide rail set 11 is formed by a transmission element coated with a chrome-cobalt-cobalt composite coating, and the linear slide 11 includes a slide rail 111 and a slider (sliding). In the present embodiment, the component substrate 1 of the slide rail 111 is made of chrome molybdenum steel; the slider 112 is made of a material of polycarbonate (PC) and is electroplated on the surface by electroless plating. One layer of the interposer 2, that is, the element substrate 1 of the slider 112 is made of polycarbonate (PC), and the material of the interposer 2 is nickel; for the slide rail 111 and the slider 112, the trivalent chromium plating method of the present invention is used ( The composition and operating conditions of the plating solution in Table 1 are electroplated on the element substrate 1 or the interposer 2 to form a chromium oxide cobalt composite plating layer 3, and the chromium oxide cobalt composite plating layer 3 is composed of chromium element, oxygen element, cobalt element, hydrogen element, and Phosphorus composed of chromium metal (Cr), chromium oxide (Cr ₂ O ₃ ), trivalent Chromium hydroxide (Cr(OH) ₃ ), chromium phosphide (CrP), cobalt (Co), cobalt oxide (Co ₃ O ₄ ), cobalt dioxide Co ₂ O ₃ , cobalt oxide CoO, hydroxide Cobalt (Co(OH) ₃ ), cobalt phosphide (CoP), divalent cobalt hydroxide (such as Co(OH) ₂ ), phosphating bivalent cobalt (such as Co ₃ P ₂ ); its characteristics are shown in Table 5.

In this embodiment, in order to further protect the surface of the slide rail 111 and the slider 112, except that the contact surface of the slider 112 and the slide rail 111 still maintains the chrome-cobalt-cobalt composite plating layer 3, the other portion of the slide rail 111 is in the chromia cobalt oxide. The composite plating layer 3 is further coated with a resin layer 4 of a perfluorocarbon-based coating having a thickness of 5 μm or less as shown in the drawing; the chrome-cobalt-cobalt composite plating layer 3 of the slider 112 is further coated with an acrylate polymer having a thickness of 10 μm or less. The substance produces a resin layer 4 of a coating of a decane polymer formed by copolymerization; the adhesion of the resin layer 4 conforms to the requirements of ASTM-D3359, Test No. 4B. The linear slide group 11 has a thin, wear-resistant and weather-resistant chrome-cobalt-cobalt composite coating 3 on the contact surface of the slide rail 111, and does not affect the movement of the slider 112 to meet precise requirements, and the slide rail The linear slide group 11 of the 111 and the slider 112 has a sufficient degree of blackening, and has good functionality in addition to aesthetics.

<Example 4>

This embodiment is the same as the third embodiment. For the slide rail 111 and the slider 112, the chrome-cobalt-cobalt composite plating layer 3 is electroplated on the component substrate 1 by the composition of the plating solution of the present invention and the operating conditions; Table 6.

The above is intended to be illustrative only and not limiting. Any equivalent modifications or alterations to the spirit and scope of this creation shall be included in the scope of the appended patent application.

1‧‧‧element substrate

3‧‧‧electroplated cobalt chromium oxide composite coating layer

4‧‧‧resin layer

12‧‧‧ball screw set

121‧‧‧sctus (ball screw)

122‧‧‧ Nuts

Claims (8)

A transmission component coated with a chrome-cobalt-cobalt composite coating, the structure comprising a component substrate, a chromium-cobalt-cobalt composite coating; wherein the material of the component substrate is selected from the group consisting of iron, nickel, chromium, molybdenum and copper Or an alloy thereof; wherein the chrome-cobalt-cobalt composite coating is electroplated and adhered to the element substrate, and the composition comprises: chromium (Cr), chromium oxide (Cr ₂ O ₃ ), chromium hydroxide (Cr(OH) ₃ ) , cobalt (Co) and cobalt oxide; wherein the cobalt oxide is one of or a combination of cobalt trioxide (Co ₃ O ₄ ) or cobalt dioxide (Co ₂ O ₃ ); the average thickness of the chromium oxide cobalt composite coating is 3 μ m Hereinafter, the grayscale value (L%) is between 25 and 45. The transmission component of the chromia-cobalt-cobalt composite coating according to the first aspect of the invention, wherein the chrome-cobalt-cobalt composite coating component further comprises: chromium phosphide (CrP) and cobalt phosphide, wherein the cobalt phosphide is One or a combination of divalent cobalt or trivalent cobalt phosphide (CoP, Co ₂ P ₃ ). The transmission component of the chromia-cobalt-cobalt composite coating according to claim 1, wherein the surface of the chrome-cobalt-cobalt composite coating has a groove-like microstructure, and the groove-like microstructure has an 80% width (W ₈₀ ). Less than 10 μm or less; wherein the 80% width (W ₈₀ ) of the grooved microstructure is measured in any photomicrograph to measure the width of the grooved microstructure, which accounts for 80% of the maximum width of the measured data. The transmission component of the chrome-cobalt-cobalt composite coating according to claim 1, wherein the structure of the transmission component of the chrome-cobalt-cobalt composite coating further comprises a resin layer attached to the oxidation All or a part of the chrome-cobalt composite plating layer; the resin layer comprises one of cerium oxide, polyoxy siloxane compound, perfluorocarbon, perfluoro resin, phenolic resin, acrylic resin, yttrium acrylate modified resin or a combination thereof . A transmission component coated with a chrome-cobalt-cobalt composite coating, the structure comprising a component substrate, an interposer, and a chrome-cobalt-cobalt composite coating; wherein the component substrate is made of a metal or a non-metal material, covering the surface An interposer, wherein the interposer is composed of iron, nickel, chromium, copper, silver, gold, or an alloy thereof, and is formed by electroplating, electroless plating, vapor deposition, or a combination thereof; wherein The chromium-cobalt-cobalt composite plating layer is electroplated and adhered to the interposer, and the composition comprises: chromium (Cr), chromium oxide (Cr ₂ O ₃ ), chromium hydroxide (Cr(OH) ₃ ) and cobalt oxide; wherein the cobalt oxide is One or a combination of cobalt trioxide (Co ₃ O ₄ ) or cobalt oxide (Co ₂ O ₃ ); the average thickness of the chromium oxide cobalt composite coating is 3 μm or less, and the gray scale value (L%) is between 25 and 45 . The transmission component of the chrome-cobalt-cobalt composite coating according to claim 5, wherein the chrome-cobalt-cobalt composite coating further comprises: chromium phosphide (CrP) and cobalt phosphide, wherein the cobalt phosphide is One or a combination of divalent cobalt or trivalent cobalt phosphide (CoP, Co ₂ P ₃ ). The transmission component of the chromia-cobalt-cobalt composite coating according to claim 5, wherein the surface of the chrome-cobalt-cobalt composite coating has a groove-like microstructure, and the groove-like microstructure has an 80% width (W ₈₀ ). Less than 10 μm or less; wherein the 80% width (W ₈₀ ) of the grooved microstructure is measured in any photomicrograph to measure the width of the grooved microstructure, which accounts for 80% of the maximum width of the measured data. The transmission component of the chromia-cobalt-cobalt composite coating according to claim 5, wherein the transmission component of the chrome-cobalt-cobalt composite coating further comprises a resin layer attached to the oxidation All or a part of the chrome-cobalt composite plating layer; the resin layer comprises one of cerium oxide, polyoxy siloxane compound, perfluorocarbon, perfluoro resin, phenolic resin, acrylic resin, yttrium acrylate modified resin or a combination thereof .