Groove external electroplating technology of cylinder body

An electroplating process and cylinder technology, applied in the direction of electrolytic coatings, coatings, etc., can solve the problems that the electroplating process cannot guarantee the quality of the composite coating, the cylinder products cannot meet the needs of use, and the quality assurance of the finished product is difficult, so as to avoid poor bonding force. , Guaranteed performance, high density effect

Inactive Publication Date: 2016-08-24
LONCIN MOTOR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the usual electroplating process, the electroplating solution is in a basically static environment, and the cations are passively moved to the inner surface of the cylinder as the cathode, and the resulting concentration difference makes the coating not tight, so it is easy to fall off, and the electroplating time is longer; and because The problem of concentration difference makes the coating thickness of the final product vary greatly and is difficult to control, which makes it difficult to control some key dimensions of the inner surface of the cylinder. Therefore, it is difficult to guarantee the quality of the finished product after electroplating
In the prior art, there is a technical scheme of circulating the electroplating solution to electroplate the nickel-silicon carbide composite layer on the inner circular surface of the cylinder, but because the electroplating process cannot guarantee the quality of the composite coating, the final cylinder product obtained cannot meet the needs of use

Method used

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  • Groove external electroplating technology of cylinder body
  • Groove external electroplating technology of cylinder body

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] The electroplating process outside the tank of the cylinder body of the present embodiment comprises the following steps:

[0078] a. Preprocessing:

[0079] a1. Etching, through NaOH 25g / L lye alkali etching, the time is 175s, and the temperature of the alkali etching solution is 40°C; it is carried out by the way of lye flowing through the inner surface of the cylinder;

[0080]a2. Passivation, passivation is carried out by acid solution, which includes 50g / L of potassium hydrogen persulfate and 6g / L of sulfuric acid; the time is 175s, and the temperature of the acid etching solution is 35°C; the acid solution is used to flow through the cylinder superficially;

[0081] a3. Activation, further corroding the inner surface of the cylinder with hydrofluoric acid 13g / L acid solution; the time is 30s, and the temperature is room temperature; the acid solution flows through the inner surface of the cylinder;

[0082] a4. Zinc conversion, using chemical zinc conversion to ...

Embodiment 2

[0089] The electroplating process outside the tank of the cylinder body of the present embodiment comprises the following steps:

[0090] a. Preprocessing:

[0091] a1. Etching, through NaOH 5g / L lye alkali etching, the time is 180s, and the temperature of the alkali etching solution is 60°C; it is carried out by the way of lye flowing through the inner surface of the cylinder;

[0092] a2. Passivation, passivation is carried out by acid solution, which includes 12g / L of potassium hydrogen persulfate and 15g / L of sulfuric acid; the time is 180s, and the temperature of the acid etching solution is 45°C; the acid solution is used to flow through the cylinder superficially;

[0093] a3. Activation, further corroding the inner surface of the cylinder with hydrofluoric acid 4g / L acid solution; the time is 90s, and the temperature is room temperature; the acid solution flows through the inner surface of the cylinder;

[0094] a4. Zinc conversion, using chemical zinc conversion to ...

Embodiment 3

[0101] The electroplating process outside the tank of the cylinder body of the present embodiment comprises the following steps:

[0102] a. Preprocessing:

[0103] a1. Etching, through NaOH 18g / L lye alkali etching, the time is 178s, and the temperature of the alkali etching solution is 50°C; it is carried out by the way of lye flowing through the inner surface of the cylinder;

[0104] a2. Passivation, passivation is carried out by acid solution, which includes 35g / L of potassium hydrogen persulfate and 9g / L of sulfuric acid; the time is 178s, and the temperature of the acid etching solution is 40°C; the acid solution is used to flow through the cylinder superficially;

[0105] a3. Activation, further corroding the inner surface of the cylinder with hydrofluoric acid 8g / L acid solution; the time is 60s, and the temperature is room temperature; the acid solution flows through the inner surface of the cylinder;

[0106] a4. Zinc conversion, using chemical zinc conversion to ...

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PUM

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Abstract

The invention discloses a groove external electroplating technology of a cylinder body. Groove external electroplating is adopted, the inner surface of the cylinder body is used as a cathode and sleeves an anode, electroplating liquid flows through an annulus clearance between the inner surface of the cylinder body and the outer surface of the anode to form an electroplating environment, electrification is implemented, and then electroplating is finished. According to the scheme, the electroplating environment is formed by the flowing electroplating liquid, by the flowing electroplating liquid, real-time substitution of positive ions on a plating layer is guaranteed, concentration difference between the positive ions on the surface of the plating layer of the cathode is not changed basically, large concentration difference is avoided, the thickness of the plating layer is variable and controllable, meanwhile, by the undifferentiated concentration, compactness of the plating layer is guaranteed, the flowing electroplating liquid can balance change of the PH environment of the plating liquid caused by the hydrogen evolution effect, poor binding force is avoided, and electroplating quality is guaranteed.

Description

technical field [0001] The invention relates to an electroplating process for cylinder workpieces, in particular to a flowing electroplating process outside a tank. Background technique [0002] As the main part of the engine, the cylinder block is used to form the combustion chamber together with the piston and the cylinder head, and provide the movement track for the piston assembly, thereby forming a power conversion environment. When the cylinder guides the piston to reciprocate continuously, the inner wall of the cylinder and the piston rub against each other for a long time and at high frequency, which reduces the useful power of the cylinder and consumes part of the energy. Therefore, there is electroplating on the inner wall in the prior art, and the electroplating coating is used to replace the cylinder liner to solve the above problems. In the usual electroplating process, the electroplating solution is in a basically static environment, and the cations are passiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D5/08C25D7/04C25D15/00C25D5/14
CPCC25D5/08C25D5/14C25D7/04C25D15/00
Inventor 刘智勇聂进
Owner LONCIN MOTOR
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