Brush plating method for chromium-plated layer damaged part

Abstract

The invention belongs to the technical field of electric brush plating, and discloses an electric brush plating method for a chromium-plated layer damaged part, and in the electric brush plating method for the chromium-plated layer damaged part, a damaged part of the chromium-plated layer damaged part is ground and trimmed, so that the total width of the damaged part is at least three times of the total depth, and the operation of subsequent steps is facilitated; the damaged part of the base body is filled through argon arc welding surfacing, so that the base body is repaired, and a filling layer is formed; grinding and polishing the surface of the filling layer; activating the surfaces of the filling layer and the chromium plating layer by using an activating solution to prepare for subsequent brush electroplating; and performing brush plating on the surfaces of the filling layer and the chromium plating layer by using an electric brush plating solution so as to form a remanufactured layer and finish repair. According to the electric brush plating method for the chromium-plated layer damaged part, firstly, the base body is repaired, and then electric brush plating is conducted, so that the whole damaged part can be completely repaired, and it is ensured that the hardness, abrasion resistance and corrosion resistance of the repaired chromium-plated layer damaged part can all meet the requirements.

Description

Technical Field

[0001] The invention relates to the technical field of electric brush plating, in particular to an electric brush plating method for a chromium-plated damaged part. Background Art

[0002] Hard chrome plating, also known as wear-resistant chrome, offers high hardness and a low coefficient of friction, making it widely used in structures such as aircraft landing gear. Chrome-plated parts generally consist of a substrate and a chrome layer applied to the substrate. During use, the chrome layer can become damaged, primarily through localized wear, scratches, and coating shedding, inevitably damaging the substrate itself.

[0003] The prior art provides a method for brush plating a chrome layer on a carbon steel composite substrate. The method first repairs the scratched area, then uses insulating tape to shield and protect the undamaged area, and finally repairs the damaged area by brush plating. This method suffers from the problem that brush plating directly repairs the damaged area, which can regenerate the chrome layer, but does not repair the substrate. If the substrate is severely damaged, the hardness, wear resistance, and corrosion resistance of the chrome-plated part repaired using this method will not meet the requirements. Summary of the Invention

[0004] The present invention provides a brush plating method for damaged chrome-plated parts, so as to solve the problem in the prior art that when the substrate is severely damaged, the hardness, wear resistance and corrosion resistance of the chrome-plated parts repaired by the repair method do not meet the requirements.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A brush plating method for a damaged chrome-plated part, wherein the damaged chrome-plated part comprises a substrate and a chrome-plated layer provided on the substrate, comprising:

[0007] S100: Grinding and trimming the damaged portion of the chrome-plated damaged part so that the total width of the damaged portion is at least three times the total depth;

[0008] S200: filling the damaged part of the substrate by argon arc welding to form a filling layer;

[0009] S300: grinding and polishing the surface of the filling layer;

[0010] S400: activating the surfaces of the filling layer and the chrome-plated layer using an activation solution;

[0011] S500: using a brush plating solution to perform brush plating on the surfaces of the filling layer and the chrome plating layer.

[0012] As a preferred solution of the brush plating method for chrome-plated damaged parts, the method further includes the following steps between steps S100 and S200:

[0013] S110: Rinse the damaged area with deionized water.

[0014] As a preferred solution of the brush plating method for chrome-plated damaged parts, the method further includes the following steps between steps S200 and S300:

[0015] S210: Rinse the surface of the filling layer with deionized water.

[0016] As a preferred solution of the brush plating method for chrome-plated damaged parts, the method further includes the following steps between steps S300 and S400:

[0017] S310: using deionized water to rinse the surfaces of the filling layer and the chrome plating layer.

[0018] As a preferred solution of the brush plating method for chrome-plated damaged parts, the method further includes the following steps between steps S310 and S400:

[0019] S320: Use insulating tape to cover undamaged areas.

[0020] As a preferred solution of the brush plating method for chrome-plated damaged parts, the method further includes the following steps between steps S400 and S500:

[0021] S410: using deionized water to rinse the activated filling layer and the surface of the chrome-plated layer.

[0022] As a preferred solution of the brush plating method for damaged chrome-plated parts, in step S200, the material of the solder is the same as that of the substrate.

[0023] As a preferred solution of the brush plating method for chrome-plated damaged parts, the solder and the substrate are both made of stainless steel.

[0024] As a preferred solution for the brush plating method of damaged chrome-plated parts, the formula and concentration of the activation solution are: 90-100 g / L of concentrated sulfuric acid, 90-100 g / L of ammonium sulfate, 5-7 g / L of phosphoric acid and 4-6 g / L of additives, wherein the additives are a mixture of fluorosilicic acid, thiourea and sodium lauryl sulfate.

[0025] As a preferred solution for the brush plating method for damaged parts of the chrome-plated layer, the formula and concentration of the brush plating solution are: 260g / L nickel sulfate, 100g / L cobalt sulfate, 20ml / L formic acid, 55g / L acetic acid and 20g / L salt. 20g of aluminum oxide nanoparticles are also added per liter of the brush plating solution.

[0026] The beneficial effects of the present invention are:

[0027] The application provides a brush plating method for a chromium plating layer damaged part, wherein the damaged part of the chromium plating layer damaged part is ground and trimmed so that the total width of the damaged part is at least 3 times the total depth, thereby facilitating the operation of the subsequent steps; the damaged part of the substrate is filled by argon arc welding surfacing, thereby repairing the substrate to form a filling layer; the surface of the filling layer is polished; the surface of the filling layer and the chromium plating layer is activated by using an activating solution, thereby preparing for the subsequent brush plating; the surface of the filling layer and the chromium plating layer is brush plated by using a brush plating solution, thereby forming a remanufacturing layer, and the repairing is completed. The brush plating method for the chromium plating layer damaged part first repairs the substrate, and then performs brush plating, thereby completely repairing the entire damaged part, so that the hardness, wear resistance and corrosion resistance of the repaired chromium plating layer damaged part can meet the requirements. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a structural schematic diagram of a chromium plating layer damaged part in the embodiment of the application;

[0029] Figure 2 is a flowchart of a brush plating method for a chromium plating layer damaged part in the embodiment of the application Figure 1 ;

[0030] Figure 3 is a flowchart of a brush plating method for a chromium plating layer damaged part in the embodiment of the application Figure 2 .

[0031] In the drawings:

[0032] 1, substrate; 2, chromium plating layer; 11, substrate filling layer; 21, plating layer remanufacturing layer. DETAILED DESCRIPTION

[0033] The application will be further described below in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the application, but not to limit the application. In addition, it should be noted that, for the convenience of description, only the parts related to the application are shown in the drawings, but not all the structures.

[0034] In the description of the application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or detachably connected, or integrated; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0035] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "over" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. The first feature "under", "below" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.

[0036] In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like, orientation or positional relationship shown in the drawings, are only for the convenience of description and simplification of operation, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0037] The chromium-plated part generally includes a base body and a chromium-plated layer arranged on the base body. During use, the chromium-plated layer will be damaged to a certain extent, and the damage forms mainly include local wear, scratches, and peeling of the plating layer, and the base body itself will inevitably be damaged. The prior art provides a chromium plating layer and carbon steel composite base body brush plating method, which first trims the damaged part, then uses an insulating tape to shield and protect the undamaged part, and finally brush plates the damaged part for repair. The problem of the above-mentioned scheme is that it directly brush plates the damaged part for repair, which can re-form the chromium-plated layer, but does not repair the base body. In the case of severe damage to the base body, the hardness, wear resistance and corrosion resistance of the chromium-plated part repaired by the repair method do not meet the requirements.

[0038] To solve the above-mentioned problem, the present embodiment provides a chromium-plated layer damaged part brush plating method, which can be used in the field of brush plating technology.

[0039] Reference Figure 1 The chromium-plated layer damaged part includes a base body 1 and a chromium-plated layer 2 arranged on the base body 1. Reference Figure 2 The main steps of the chromium-plated layer damaged part brush plating method provided by the present embodiment are as follows.

[0040] S100: grinding and trimming the damaged part of the chromium-plated layer damaged part, so that the total width of the damaged part is at least 3 times the total depth.

[0041] Among them, the damaged part generally appears in the form of a pit, such as Figure 1 As shown, after the chrome plating layer 2 is damaged, the substrate 1 will also be damaged to a certain extent. The damaged part of the chrome plating layer is ground and trimmed to facilitate subsequent filling and brush plating operations.

[0042] S200 : using argon arc welding to fill the damaged part of the substrate 1 to form a filling layer 11 .

[0043] This step can complete the repair of the substrate 1 .

[0044] S300: grinding and polishing the surface of the filling layer 11.

[0045] S400: Activate the surfaces of the filling layer 11 and the chrome plating layer 2 using an activation solution.

[0046] The surface of the filling layer 11 is polished and then activated to prepare for subsequent brush plating. In this embodiment, the entire filling layer 11 needs to be activated, but for the chrome layer 2, only the chrome layer 2 near the damaged area is activated.

[0047] S500: Brush plating is performed on the surfaces of the filling layer 11 and the chrome plating layer using a brush plating solution.

[0048] Specifically, a plating pen is dipped in a special activation liquid, and the surface of the chrome plating layer 2 and the filling layer 11 are rubbed under the condition that the positive pole of the power supply is connected to the plating pen and the negative pole is connected to the workpiece. At the same time, the surface of the chrome plating layer 2 and the filling layer 11 are fully activated, so that the plating remanufacturing layer 21 can be formed, and the repair of the entire chrome plating layer damaged parts is completed.

[0049] The formula and concentration of the brush plating solution are: 260g / L nickel sulfate, 100g / L cobalt sulfate, 20ml / L formic acid, 55g / L acetic acid and 20g / L hydrochloric acid. 20g of aluminum oxide nanoparticles are also added to each liter of brush plating solution. The aluminum oxide nanoparticles are dissolved in distilled water and dispersed using a high-energy mechanochemical method.

[0050] The brush plating method for damaged chrome-plated parts first repairs the substrate 1 and then performs brush plating, which can completely repair the entire damaged area to ensure that the hardness, wear resistance and corrosion resistance of the repaired damaged chrome-plated parts meet the requirements.

[0051] Furthermore, the detailed steps of the brush plating method for damaged chrome-plated parts provided in this embodiment are as follows.

[0052] S100: Grind and trim the damaged part of the chrome-plated damaged part so that the total width of the damaged part is at least 3 times the total depth.

[0053] S110: flushing the damaged part with deionized water.

[0054] By this step, the debris remaining from the grinding finishing can be removed, facilitating the subsequent welding operation.

[0055] S200: using argon arc welding to fill the damaged part of the base 1 to form a filling layer 11.

[0056] Optionally, the material of the welding material is the same as that of the base 1, so that the physical and chemical properties of the base 1 and the filling layer 11 are consistent. Further, the welding material and the base 1 are both stainless steel materials, specifically 304 stainless steel wire materials.

[0057] S210: flushing the surface of the filling layer 11 with deionized water.

[0058] By this step, the impurities remaining from the welding can be removed, facilitating the subsequent grinding and polishing.

[0059] S300: grinding and polishing the surface of the filling layer 11.

[0060] S310: flushing the surface of the filling layer 11 and the chrome plating layer 2 with deionized water.

[0061] By this step, the debris and impurities remaining from the grinding and polishing can be removed, facilitating the subsequent activation operation.

[0062] S320: using insulating tape to attach the undamaged part.

[0063] In order to avoid the activation liquid from causing pollution and corrosion to the undamaged part, the insulating tape is used to attach the undamaged part, so that the subsequent activation and brush plating are only performed on the damaged part.

[0064] S400: using an activation liquid to activate the surface of the filling layer 11 and the chrome plating layer 2.

[0065] S410: flushing the surface of the activated filling layer 11 and the chrome plating layer 2 with deionized water.

[0066] By this step, the activation liquid remaining on the surface of the filling layer 11 and the chrome plating layer 2 can be washed away, facilitating the subsequent brush plating operation.

[0067] S500: using a brush plating liquid to brush plate the surface of the filling layer 11 and the chrome plating layer 2.

[0068] In the embodiment, the formula and concentration of the activating solution are: concentrated sulfuric acid 90-100 g / L, ammonium sulfate 90-100 g / L, phosphoric acid 5-7 g / L, and additives 4-6 g / L, the additives being a mixture of fluosilicic acid, thiourea, and sodium dodecyl sulfate. Among them, the additives such as fluosilicic acid, thiourea, and sodium dodecyl sulfate act as corrosion inhibitors to form a good adsorption film on the surface of the chromium plating layer 2 and the filling layer 11, neutralize the severe corrosion of the acidic activating solution in the activation process, and have the effect of inhibiting the generation of acid mist, which can better protect the operators.

[0069] Example 1

[0070] In the embodiment, the formula and concentration of the activating solution are: concentrated sulfuric acid 90-100 g / L, ammonium sulfate 90-100 g / L, phosphoric acid 5-7 g / L, and additives 4-6 g / L, the additives being a mixture of fluosilicic acid, thiourea, and sodium dodecyl sulfate. Among them, the additives such as fluosilicic acid, thiourea, and sodium dodecyl sulfate act as corrosion inhibitors to form a good adsorption film on the surface of the chromium plating layer 2 and the filling layer 11, neutralize the severe corrosion of the acidic activating solution in the activation process, and have the effect of inhibiting the generation of acid mist, which can better protect the operators.

[0071] Example 2

[0072] In the embodiment, the formula and concentration of the activating solution are: concentrated sulfuric acid 90-100 g / L, ammonium sulfate 90-100 g / L, phosphoric acid 5-7 g / L, and additives 4-6 g / L, the additives being a mixture of fluosilicic acid, thiourea, and sodium dodecyl sulfate. Among them, the additives such as fluosilicic acid, thiourea, and sodium dodecyl sulfate act as corrosion inhibitors to form a good adsorption film on the surface of the chromium plating layer 2 and the filling layer 11, neutralize the severe corrosion of the acidic activating solution in the activation process, and have the effect of inhibiting the generation of acid mist, which can better protect the operators.

[0073] Example 3

[0074] In the embodiment, the formula and concentration of the activating solution are: concentrated sulfuric acid 90-100 g / L, ammonium sulfate 90-100 g / L, phosphoric acid 5-7 g / L, and additives 4-6 g / L, the additives being a mixture of fluosilicic acid, thiourea, and sodium dodecyl sulfate. Among them, the additives such as fluosilicic acid, thiourea, and sodium dodecyl sulfate act as corrosion inhibitors to form a good adsorption film on the surface of the chromium plating layer 2 and the filling layer 11, neutralize the severe corrosion of the acidic activating solution in the activation process, and have the effect of inhibiting the generation of acid mist, which can better protect the operators.

[0075] Comparative Example 1

[0076] In this example, damaged chrome-plated parts were repaired using the aforementioned steps. The components and concentrations of the specialized activation solution were: 85 g / L concentrated sulfuric acid, 92 g / L ammonium sulfate, 4 g / L phosphoric acid, and 5 g / L additives. The brush plating solution also contained 260 g / L nickel sulfate, 100 g / L cobalt sulfate, 20 ml / L formic acid, 55 g / L acetic acid, and 20 g / L hydrochloric acid. Each liter of the brush plating solution also contained 20 g of aluminum oxide nanoparticles dissolved in distilled water and dispersed using a high-energy mechanochemical method.

[0077] Referring to industry standards, the above-mentioned Examples 1, 2, 3 and Comparative Example 1 were subjected to file tests, eccentric turning tests and thermal shock tests to verify the bonding strength of the coating. The test results were analyzed and the coating surface was observed using a scanning electron microscope. The results are shown in Table 1.

[0078] Table 1 Results of file test, eccentricity test and thermal shock test

[0079]

[0080] As can be seen from Table 1, the special activation solution provided in this embodiment improves the concentrations of concentrated sulfuric acid and phosphoric acid, resulting in an excellent chromium plating layer with no blistering, cracking, or peeling, and the plating layer has good bonding strength.

[0081] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A brush plating method for a chrome-plated damaged part, wherein the chrome-plated damaged part comprises a substrate and a chrome-plated layer provided on the substrate, characterized in that: include: S100: Grinding and trimming the damaged portion of the chrome-plated damaged part so that the total width of the damaged portion is at least three times the total depth; S200: filling the damaged part of the substrate by argon arc welding to form a filling layer; S300: grinding and polishing the surface of the filling layer; S400: activating the surfaces of the filling layer and the chrome-plated layer using an activation solution; S500: using a brush plating solution to perform brush plating on the surfaces of the filling layer and the chrome plating layer.

2. The brush plating method for damaged chrome-plated parts according to claim 1, characterized in that: Also included between steps S100-S200: S110: Rinse the damaged area with deionized water.

3. The brush plating method for damaged chrome-plated parts according to claim 1, characterized in that: Also included between steps S200 and S300: S210: Rinse the surface of the filling layer with deionized water.

4. The brush plating method for damaged chrome-plated parts according to claim 1, characterized in that: Also included between steps S300 and S400: S310: using deionized water to rinse the surfaces of the filling layer and the chrome plating layer.

5. The brush plating method for damaged chrome-plated parts according to claim 4, characterized in that: Also included between steps S310-S400: S320: Use insulating tape to cover undamaged areas.

6. The brush plating method for damaged chrome-plated parts according to claim 1, characterized in that: Also included between steps S400 and S500: S410: using deionized water to rinse the activated filling layer and the surface of the chrome-plated layer.

7. The brush plating method for damaged chrome-plated parts according to any one of claims 1 to 6, characterized in that: In step S200 , the material of the solder is the same as that of the substrate.

8. The brush plating method for damaged chrome-plated parts according to claim 7, characterized in that: The solder and the substrate are both made of stainless steel.

9. The brush plating method for damaged chrome-plated parts according to any one of claims 1 to 6, characterized in that: The formula and concentration of the activation solution are: 90-100 g / L of concentrated sulfuric acid, 90-100 g / L of ammonium sulfate, 5-7 g / L of phosphoric acid and 4-6 g / L of an additive, wherein the additive is a mixture of fluorosilicic acid, thiourea and sodium lauryl sulfate.

10. The brush plating method for damaged chrome-plated parts according to any one of claims 1 to 6, characterized in that: The formula and concentration of the brush plating solution are: 260g / L nickel sulfate, 100g / L cobalt sulfate, 20ml / L formic acid, 55g / L acetic acid and 20g / L salt. 20g of aluminum oxide nanoparticles are also added per liter of the brush plating solution.

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