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Treatment Method of Electroless Nickel-Phosphorus Composite Plating for Cylinder Liner

A treatment method and a technology for a cylinder liner, which are applied in the field of chemical nickel-phosphorus composite plating treatment of the cylinder liner, can solve the problems of high electroplating production line and tooling requirements, serious pollution of electroplating chromium process, high production waste rate, and achieve good inner hole sealing effect, Good adaptability and the effect of preventing pit bubble corrosion

Active Publication Date: 2017-10-03
ZYNP GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After working for a long time, the parts of the cylinder liner in contact with water will cause serious cavitation corrosion due to the combined effect of "cavitation corrosion", "electrochemical corrosion" and other corrosion; cavitation corrosion can cause destructive honeycomb-shaped concaves on the outer surface of the cylinder Pit, or even form a hole through the cylinder wall, causing the cylinder liner to fail
In order to prevent cavitation failure of the cylinder liner, an electrochrome plating layer can be used on the outer surface of the cylinder liner, but the electrochrome plating process is seriously polluted, and the requirements for the electroplating production line and tooling are high, and the production scrap rate is also high, so the application is limited.

Method used

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  • Treatment Method of Electroless Nickel-Phosphorus Composite Plating for Cylinder Liner
  • Treatment Method of Electroless Nickel-Phosphorus Composite Plating for Cylinder Liner
  • Treatment Method of Electroless Nickel-Phosphorus Composite Plating for Cylinder Liner

Examples

Experimental program
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Effect test

Embodiment 1

[0032] A cylinder liner chemical nickel-phosphorus composite plating treatment method; after the cylinder liner is degreased and cleaned, the cylinder liner inner hole is sealed by a cylinder liner inner hole sealing device, and then the cylinder liner with the inner hole sealed is put into the plating solution for Electroless plating, plating solution parameters are as follows: nickel ion concentration in the plating solution is 5g / L, sodium hypophosphite concentration in the plating solution is 25g / L, the pH value of the plating solution is 5, the plating solution temperature is 85°C; the electroless plating time is 60min, After electroless plating, keep the cylinder liner at 200°C for 3 hours. The cylinder liner is made of gray cast iron.

[0033] Such as figure 2 As shown in -14, the cylinder liner inner hole sealing device in this embodiment includes an upper tie rod 1, a lower rod 2, an upper pressure plate 3, an upper pressure plate 4, a lower pressure plate 6, a bear...

Embodiment 2

[0038] A cylinder liner chemical nickel-phosphorus composite plating treatment method; after the cylinder liner is degreased and cleaned, the cylinder liner inner hole is sealed by a cylinder liner inner hole sealing device, and then the cylinder liner with the inner hole sealed is put into the plating solution for Electroless plating, plating solution parameters are as follows: nickel ion concentration in the plating solution is 4.5g / L, sodium hypophosphite concentration in the plating solution is 20g / L, pH value of the plating solution is 4.1, bath temperature is 80°C; electroless plating time is 20 minutes , After electroless plating, keep the cylinder liner at 600°C for 1h. The cylinder liner is made of vermicular graphite cast iron.

[0039] The cylinder liner inner hole sealing device used in embodiment 2 is the same as the cylinder liner inner hole sealing device used in embodiment 1.

[0040] After electroless plating, the thickness of the coating formed on the outer ...

Embodiment 3

[0042] A cylinder liner chemical nickel-phosphorus composite plating treatment method; after the cylinder liner is degreased and cleaned, the cylinder liner inner hole is sealed by a cylinder liner inner hole sealing device, and then the cylinder liner with the inner hole sealed is put into the plating solution for Electroless plating, the parameters of the plating solution are as follows: the concentration of nickel ions in the plating solution is 8g / L, the concentration of sodium hypophosphite in the plating solution is 30g / L, the pH value of the plating solution is 6, and the temperature of the plating solution is 90°C; After plating, keep the cylinder liner at 300°C for 2 hours. The cylinder liner is made of ductile iron.

[0043] The cylinder liner inner hole sealing device used in embodiment 3 is the same as the cylinder liner inner hole sealing device used in embodiment 1. After electroless plating, the thickness of the coating formed on the outer circle of the cylinde...

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Abstract

The invention belongs to a chemical nickel-phosphorus composite plating treatment method for a cylinder liner. After the cylinder liner is degreased and cleaned, the inner hole of the cylinder liner is sealed by a cylinder liner inner hole sealing device, and then the cylinder liner with the inner hole sealed is put into the plated Electroless plating is carried out in the bath, and bath parameter is as follows: nickel ion concentration 4-8g / L in bath, sodium hypophosphite concentration 20-30g / L in bath, bath pH value is 4.1-6, plating bath The liquid temperature is 80-90°C; after electroless plating, keep the cylinder liner at 200-600°C for 1-3h. The chemical nickel-phosphorus composite plating is applied to the working face of the outer circle of the cylinder liner, and a layer of nickel-phosphorus composite coating is formed on the outer circle of the cylinder liner by chemical plating, which can well protect the cylinder liner; and there will be no chromium pollution during the treatment process , and is especially suitable for processing diesel engine cylinder liners. The processing method of the present invention can easily and efficiently transform ordinary diesel engine cylinder liners into diesel engine environmental protection and corrosion-resistant cylinder liners.

Description

technical field [0001] The invention belongs to the technical field of surface treatment of cylinder liners, and in particular relates to a treatment method for chemical nickel-phosphorus composite plating of cylinder liners. Background technique [0002] When the cylinder liner is working, the outer circle is in contact with the cooling water, which can transfer the waste heat of the engine to the cooling water and maintain the normal working temperature. After working for a long time, the parts of the cylinder liner in contact with water will cause serious cavitation corrosion due to the combined effect of "cavitation corrosion", "electrochemical corrosion" and other corrosion; cavitation corrosion can cause destructive honeycomb-shaped concaves on the outer surface of the cylinder Pit, or even form a hole through the cylinder wall, causing the cylinder liner to fail. In order to prevent cavitation failure of the cylinder liner, an electrochrome plating layer can be adopt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C18/36
Inventor 高广东徐超曹红星姜玉领张亮亮赵记霞
Owner ZYNP GRP