Anode structure for large-size inner-hole iron plating repair and application

An anode structure, large size technology, applied in the field of electrochemistry, can solve the problems of slow deposition rate, difficult plating thickness, limiting current density, etc., achieve stable mechanical properties such as hardness, reduce industrial water pollution, and enhance coating uniformity. Effect

Active Publication Date: 2019-01-11
DALIAN MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many types of processes used, mainly including chloride type, sulfate type, fluoroborate type and mixed plating solution. Among them, the sulfate type has a slow precipitation speed and poor dispersion ability; the fluoroborate type has many harmful components to the human body. , the process is unstable
The hot chloride system is more ideal and widely used. The main disadvantages of the hot chloride system are: high temperature, large acid mist, energy consumption, and great impact on the environment. In addition, pure iron powder must be added for large-scale treatment within two weeks.
[0003] For deep-hole parts, the plating thickness of the inner hole is more difficult than that of the outer surface. The main performance is that the anode needs to be suspended in the hole. Due to space constraints, the area of ​​the anode is smaller than the area of ​​the cathode, resulting in slow deposition: deep hole plating The anode installation of the workpiece is complicated. It is necessary to ensure good electrical conductivity between the workpiece and the anode, and at the same time to ensure the insulation between the workpiece and the anode, and to ensure that the spacing between the cathode and the anode is evenly distributed.
Since only a small amount of plating solution can be accommodated between the workpiece and the anode, and the distance between the two is also very small, not only is it easy to cause polarization of the concentration difference of the plating solution, too fast temperature rise, difficulty in removing hydrogen gas, and bridging and short-circuiting by burrs, but also also limits the current density
These factors restrict the coating thickness, coating uniformity and processing efficiency of the inner hole coating.

Method used

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  • Anode structure for large-size inner-hole iron plating repair and application
  • Anode structure for large-size inner-hole iron plating repair and application
  • Anode structure for large-size inner-hole iron plating repair and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Such as Figure 1-Figure 3 As shown, an anode structure for repairing large-scale inner holes with iron plating includes a steel column 1 and a cross-connected titanium plate 2 located at the lower end of the steel column 1, and the axis of the steel column 1 is connected to the cross-connected titanium plate 2 The axes of are on the same straight line;

[0036] The lower titanium plates 3 are arranged between the adjacent support plates 21 of the cross-connected titanium plates 2, and the four lower titanium plates 3 are evenly distributed around the straight line where the axis of the steel column 1 is located.

[0037] The plane where the upper end of the lower titanium plate 3 is located is located below the plane where the upper end of the cross-connected titanium plate 2 is located and the distance is 1 / 4L, and the plane where the lower end of the lower titanium plate 3 is located is located at the plane where the lower end of the cross-connected titanium plate 2 ...

Embodiment 2

[0044] Such as Figure 4 As shown, a large-size inner hole iron plating repair device includes an electroplating tank 5 and an acid-resistant pump 6 located in the electroplating tank 5, a tooling fixture 8 for clamping a workpiece 7 with a large-size inner hole, and as implemented The anode structure of the iron-plated repair of the large-scale inner hole described in example 1;

[0045] The fixture 8 is in the shape of an inverted U, its lower end opening has a clamping portion 81 for clamping the workpiece 7, its upper end has a hole 82 through which the steel column 1 passes and is rotatably connected with the steel column 1, The upper end of the steel column 1 passes through the hole 82 to connect with the rotating device, the cross-connected titanium plate 2 and the lower titanium plate 3 are located in the space surrounded by the workpiece 7,

[0046] The input end 61 of the acid-resistant pump 6 is located outside the workpiece 7 , and the output end 62 of the acid-re...

Embodiment 3

[0048] Such as Figure 5-Figure 7 As shown, a method for repairing a large-sized inner hole coating by the large-sized inner hole iron plating repair device described in Embodiment 2 has the following steps:

[0049]The workpiece 7 is pre-plated and started to be plated;

[0050] The workpiece 7 is a cylinder simulation piece with a diameter of 456mm and a length of 500mm;

[0051] The anode structure repaired by the iron-plating of the large-size inner hole is connected to the positive pole, the workpiece 7 is connected to the negative pole, and an insulating layer is provided on the outside of the workpiece 7;

[0052] Using the method of controlling the forward voltage U positive and reverse voltage U reverse symmetrical AC activation, after the surface of the workpiece 7 fully reaches the micro-melt activation state, select appropriate electrical parameters to perform AC starting plating, AC transition plating, small DC plating, DC transition plating and large DC plating...

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Abstract

The invention discloses an anode structure for large-size inner-hole iron plating repair and an application. The anode structure for large-size inner-hole iron plating repair comprises a steel columnand a cross-shaped connection titanium plate positioned at the lower end of the steel column, the axis of the steel column and the axis of the cross-shaped connection titanium plate are positioned onthe same straight line, a lower titanium plate is arranged between every two adjacent supporting plates of the cross-shaped connection titanium plate, and the four lower titanium plates are uniformlydistributed by taking the straight line where the axis of the steel column is located as the axis. According to the anode structure, the anode structure for large-size inner-hole iron plating repair is used for performing large-size cylinder sleeve inner-hole iron plating repair, compared with a traditional cylindrical anode, the anode structure for large-size inner-hole iron plating repair is characterized in that the surface is extremely large, then the contact area between the anode structure and a plating solution is increased, and the concentration difference of the plating solution is relatively small.

Description

technical field [0001] The invention relates to the structure and application of an iron-plated anode, which belongs to the technical field of electrochemistry, in particular to an anode structure and application for iron-plated repair of large-sized inner holes. Background technique [0002] At present, the international and domestic electroplating iron process is mainly used for repairing, such as various automobiles, trains, ship engine crankshafts, camshafts and their parts, transmission shafts of various equipment, electromechanical shafts, wear, corrosion and parts that are out of tolerance. repair. There are many types of processes used, mainly including chloride type, sulfate type, fluoroborate type and mixed plating solution. Among them, the sulfate type has a slow precipitation speed and poor dispersion ability; the fluoroborate type has many harmful components to the human body. , the process is unstable. The hot chloride system is more ideal and widely used. Th...

Claims

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Application Information

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IPC IPC(8): C25D17/12C25D7/04C25D21/10
CPCC25D7/04C25D17/12C25D21/10
Inventor 董文仲徐久军马思齐马泽宇黄若轩
Owner DALIAN MARITIME UNIVERSITY
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