Electroplating impact nickel equipment

Abstract

The utility model discloses electroplating impact nickel equipment, which comprises an electroplating bath, a nickel anode, a graphite anode, a first rectifier and a second rectifier, the nickel anode is electrically connected with the anode of the first rectifier, the graphite anode is electrically connected with the anode of the second rectifier, and the cathodes of the two rectifiers are both electrically connected with a workpiece; the nickel positive plate can supplement the concentration of nickel ions consumed in the electroplating solution, and stabilize the concentration of the component content of the electroplating solution, so that the power line is uniformly distributed on the whole arc surface during electroplating, and a uniformly deposited nickel plating layer is obtained; the graphite anode provides large current density, and strong large current impacts the interior of the groove, so that a nickel plating layer can be deposited in the groove. Therefore, by utilizing the electroplating coupling provided by the utility model, the internal thread and the excircle are deposited to have uniform thickness, the surface of a plating layer is flat, the defects of pinholes, hard spots or spots, peeling, falling off, layering and the like are avoided, and the thread wall is smooth and has no obvious defects of pinholes, cracks and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of electroplating, in particular to an electroplating impact nickel device. Background Art

[0002] Copper plating is more common in traditional oil couplings. Compared with land oil and gas fields, metal materials serving in offshore oil and gas fields are exposed to a large amount of Cl-, CO2 and sulfide in the environment, forming a high pressure, low pH value and high mineralization environment, which induces severe local corrosion, accelerates stress corrosion cracking (SCC), sulfide stress corrosion cracking (SSCC), uniform corrosion, pitting, under-scale corrosion and the formation of erosion corrosion induced by CO2 / H2S environment, which are more likely to cause corrosion failure of metal materials. Therefore, more and more offshore oil and gas fields use super 13cr couplings to connect pipe ports. For the use of this coupling, in order to prevent sticking during the buckle-up and unbuckling, it must be electroplated with copper-tin alloy to meet the use requirements. As we all know, the electroplating of 13cr material must be done with impact nickel pre-plating as the bottom layer like stainless steel material before further other electroplating treatments can be performed.

[0003] Due to the particularity of the super 13cr oil coupling: the outer circle is a smooth round surface, the electric lines are evenly distributed during the electroplating process, and the difference between the high and low current density areas is small. The inner wall is a concave-convex groove structure, which is greatly affected by the distribution of electric lines and the tip effect of the current on the concave-convex surface during the electroplating process, especially the relatively small distribution of electric lines in the groove, making it difficult to deposit the coating.

[0004] The electroplating nickel impact equipment in the prior art uses a single rectifier power supply and a single nickel plate anode for electroplating nickel impact, which cannot satisfy the requirement of depositing a satisfactory uniform coating with good bonding strength on the inner and outer circles of the coupling thread. The single power supply and bilaterally symmetrical anodes used in the existing electroplating nickel impact equipment also cannot satisfy the requirement of obtaining a satisfactory uniform nickel coating on the bottom of the thread and the outer circle at the same time. Utility Model Content

[0005] In view of the above-mentioned deficiencies, the technical problem to be solved by the utility model is: to provide an electroplating impact nickel equipment, which utilizes a double rectifier and different inner and outer anode materials to electroplate a super 13cr petroleum coupling, while satisfying the bottom of the thread and the outer circle, and obtaining a satisfactory uniform nickel plating layer, and the surface of the plating layer is smooth, without defects such as pinholes, pitting or spots, peeling, shedding, and stratification.

[0006] In order to solve the above technical problems, the technical solution of the utility model is:

[0007] A nickel impact electroplating device includes an electroplating tank for containing electroplating liquid, and also includes a nickel anode, a graphite anode, a first rectifier and a second rectifier. The nickel anode is electrically connected to the positive electrode of the first rectifier, and the negative electrode of the first rectifier is electrically connected to the workpiece to be electroplated. The graphite anode is electrically connected to the positive electrode of the second rectifier, and the negative electrode of the second rectifier is electrically connected to the workpiece to be electroplated. After the workpiece to be electroplated is arranged in the electroplating tank, the graphite anode is arranged in the middle of the workpiece to be electroplated, and the nickel anode surrounds the periphery of the workpiece to be electroplated.

[0008] Preferably, the nickel anode includes four nickel electrode plates, which are symmetrically arranged on the periphery of the workpiece to be electroplated, and each of the nickel electrode plates is electrically connected to the positive electrode of the first rectifier.

[0009] Preferably, each of the nickel pole plates is suspended on the inner wall of the electroplating tank.

[0010] Preferably, the total area of ​​the nickel anode is 2 to 3 times the outer surface area of ​​the workpiece to be electroplated.

[0011] The preferred embodiment is that the graphite anode is cylindrical, and the outer diameter of the graphite anode is equal to the inner diameter of the workpiece to be electroplated. times.

[0012] Preferably, when electroplating the outer side of the workpiece to be electroplated, the voltage range of the first rectifier is 3 to 4V.

[0013] Preferably, when electroplating the inner side of the workpiece to be electroplated, the voltage range of the second rectifier is 5 to 7V.

[0014] After adopting the above technical solution, the beneficial effects of the utility model are:

[0015] The electroplating impact nickel equipment of the utility model includes an electroplating tank for containing electroplating liquid, and also includes a nickel anode, a graphite anode, a first rectifier and a second rectifier. The nickel anode is electrically connected to the positive electrode of the first rectifier, the negative electrode of the first rectifier is electrically connected to the workpiece to be electroplated, the graphite anode is electrically connected to the positive electrode of the second rectifier, and the negative electrode of the second rectifier is electrically connected to the workpiece to be electroplated. After the workpiece to be electroplated is placed in the electroplating tank, the graphite anode is placed in the middle of the workpiece to be electroplated, and the nickel anode surrounds the periphery of the workpiece to be electroplated. During the electroplating process, the soluble anode of the nickel positive plate electrolyzes and dissociates nickel ions, which replenish the nickel ion concentration consumed in the electroplating solution and stabilize the concentration of the plating solution components, so that the electric lines are more evenly distributed on the outer arc surface of the entire workpiece during electroplating, thereby obtaining a uniformly deposited nickel coating; while the graphite anode located in the middle of the workpiece has relatively better conductivity and can provide a larger current density. The strong large current impacts the groove on the inner wall of the workpiece, so that the nickel coating can be deposited in the groove, thereby ensuring the bonding force of other subsequent coatings. It can be seen that the utility model electroplated super 13cr coupling, so that the inner thread and outer circle of the coupling can be deposited with a coating of uniform thickness, and the coating surface is flat, without pinholes, pitting or spots, peeling, shedding, delamination and other defects; and the thread wall of the super 13cr coupling is smooth, without obvious pinholes, cracks and other defects; so that the coupling meets the special requirements of subsequent electroplating of copper-tin alloy and other coatings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the impact nickel electroplating equipment in the utility model;

[0017] Figure 2 It is a cross-sectional view along the AA direction of the present utility model;

[0018] Figure 3 It is a structural schematic diagram of another angle of the nickel electroplating impact equipment in the utility model;

[0019] In the figure: 1-electroplating tank, 20-first rectifier, 21-second rectifier, 3-nickel anode, 4-graphite anode, 5-workpiece. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0021] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside", and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0022] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0023] like Figure 1 , Figure 2 and Figure 3 As shown, an electroplating impact nickel equipment includes an electroplating tank 1 for containing an electroplating solution, and also includes a nickel anode 3, a graphite anode 4, a first rectifier 20 and a second rectifier 21. The nickel anode 3 is electrically connected to the positive electrode of the first rectifier 20, the negative electrode of the first rectifier 20 is electrically connected to the workpiece 5 to be electroplated, the graphite anode 4 is electrically connected to the positive electrode of the second rectifier 21, and the negative electrode of the second rectifier 21 is electrically connected to the workpiece 5 to be electroplated; after the workpiece 5 to be electroplated is arranged in the electroplating tank 1, the graphite anode 4 is arranged in the middle of the workpiece 5 to be electroplated, and the nickel anode 3 surrounds the periphery of the workpiece 5 to be electroplated.

[0024] In this embodiment, the nickel anode 3 includes four nickel plates, which are symmetrically arranged around the periphery of the workpiece 5 to be electroplated, and each nickel plate is electrically connected to the positive electrode of the first rectifier 20. In a preferred embodiment, each nickel plate is suspended on the inner wall of the electroplating tank 1.

[0025] In the present invention, the total area of ​​the nickel anode 3 is 2 to 3 times the outer surface area of ​​the workpiece 5 to be electroplated.

[0026] In this embodiment, the graphite anode 4 is cylindrical, and the outer diameter of the graphite anode 4 is equal to the inner diameter of the workpiece 5 to be electroplated. times.

[0027] In the present invention, when electroplating the outer side of the workpiece 5 to be electroplated, the voltage range of the first rectifier 20 is 3-4V; when electroplating the inner side of the workpiece 5 to be electroplated, the voltage range of the second rectifier 21 is 5-7V.

[0028] like Figure 1 , Figure 2 and Figure 3As shown, when the electroplating impact nickel equipment of the utility model is electroplating, the super 13cr coupling is subjected to pre-treatment such as degreasing, rust removal, pure water washing, activation, etc. before electroplating; the pre-treated workpiece 5 to be electroplated is placed on a special hanger and then placed in the electroplating tank 1. At the same time, four nickel plates are symmetrically and evenly suspended on the inner wall of the electroplating tank 1, specifically, placed in the corresponding four directions of the outer circle of the workpiece 5 to be electroplated, and the graphite anode 4 is placed in the middle of the workpiece 5 to be electroplated.

[0029] Turn on the first rectifier 20 and the second rectifier 21, adjust the appropriate voltage and current parameters, control the voltage of the first rectifier 20 within the range of 3 to 4V when plating the outer circle, and control the voltage of the second rectifier 21 within the range of 5 to 7V when plating the inner circle of the workpiece 5. Perform impact nickel plating for 3 to 5 minutes; lift the plated workpiece 5 out of the plating tank 1 and put it into the next plating process.

[0030] In the process of electroplating impact nickel, the nickel plates are symmetrically suspended on the four sides of the electroplating tank 1. The soluble anode is electrolyzed and dissociated into nickel ions during the electroplating process, which replenishes the nickel ion concentration consumed in the solution and stabilizes the concentration of the plating solution components, so that the electric lines are more evenly distributed on the entire arc surface during electroplating, and a uniformly deposited nickel coating can be obtained.

[0031] The graphite anode 4 has a relatively good bottom performance, so it can provide a larger current density, and a strong large current impacts the groove, so that the nickel coating can be deposited in the groove of the inner circle of the workpiece 5, thereby ensuring the bonding strength of other subsequent coatings. If the nickel anode 3 is also used for plating the inner hole, the maximum current density used cannot reach the current density used for depositing the groove.

[0032] It can be seen that the impact nickel plating of the super 3cr coupling plated by the utility model satisfies the requirements of uniform thickness deposited on the inner and outer circles of the thread at the same time, and the surface of the coating is smooth without defects such as pinholes, pitting or spots, peeling, shedding, and delamination; from a microscopic point of view, the thread wall of the super 13cr coupling is smooth without obvious defects such as pinholes and cracks; it can meet the special requirements of subsequent electroplating of copper-tin alloy and other coatings.

[0033] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications made within the spirit and principles of the present invention, improvements to the same type of nickel electroplating impact equipment, etc., should be included in the protection scope of the present invention.

Claims

1. An electroplating nickel impact device, comprising an electroplating tank for containing an electroplating solution, characterized in that: It also includes a nickel anode, a graphite anode, a first rectifier and a second rectifier, wherein the nickel anode is electrically connected to the positive electrode of the first rectifier, the negative electrode of the first rectifier is electrically connected to the workpiece to be electroplated, the graphite anode is electrically connected to the positive electrode of the second rectifier, and the negative electrode of the second rectifier is electrically connected to the workpiece to be electroplated; After the workpiece to be electroplated is arranged in the electroplating tank, the graphite anode is arranged in the middle of the workpiece to be electroplated, and the nickel anode surrounds the periphery of the workpiece to be electroplated.

2. The electroplating nickel impact equipment according to claim 1, characterized in that: The nickel anode includes four nickel plates, which are symmetrically arranged on the periphery of the workpiece to be electroplated, and each of the nickel plates is electrically connected to the positive electrode of the first rectifier.

3. The electroplating nickel impact equipment according to claim 2, characterized in that: Each of the nickel pole plates is suspended on the inner wall of the electroplating tank.

4. The electroplating nickel impact equipment according to claim 1, characterized in that: The total area of ​​the nickel anode is 2 to 3 times the outer surface area of ​​the workpiece to be electroplated.

5. The electroplating nickel impact equipment according to claim 1, characterized in that: The graphite anode is cylindrical, and the outer diameter of the graphite anode is equal to the inner diameter of the workpiece to be electroplated. times.

6. The electroplating nickel strike equipment according to any one of claims 1 to 5, characterized in that: When electroplating the outer side of the workpiece to be electroplated, the voltage range of the first rectifier is 3 to 4V.

7. The electroplating nickel strike equipment according to any one of claims 1 to 5, characterized in that: When electroplating the inner side of the workpiece to be electroplated, the voltage range of the second rectifier is 5 to 7V.

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