Unlock instant, AI-driven research and patent intelligence for your innovation.

Wear resistant coating of piston ring for internal-combustion engine and electroplating process

A kind of electroplating process and anti-wear coating technology, which can be used in piston rings, mechanical equipment, engine components, etc., and can solve the problems of high energy consumption and serious pollution.

Inactive Publication Date: 2011-02-16
曹新忠
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The two methods have high energy consumption, serious pollution, and produce a large amount of waste water containing chromium ions

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) Pre-plating treatment of piston ring: follow the conventional metal surface treatment method or install the following steps: fix the piston ring on the fixture, electrolytic degreasing, activate the surface of the piston ring with acid, roughening treatment, chemical degreasing, Tap water cleaning, electrolytic degreasing, tap water cleaning, acid activation, tap water cleaning, ultrasonic cleaning and deionized water cleaning. Each step is carried out in accordance with known techniques.

[0016] (2) Preparation of electroplating solution: 60g / L of nickel sulfate, 40g / L of sodium tungstate, 20g / L of boric acid, 25g / L of sodium citrate, 12g / L of ferrous sulfate and 15g / L of citric acid. Dissolve the required amount in a small amount of water respectively, then mix and stir evenly in order, dilute with water to the specified amount of the plating tank and stir evenly, then adjust the pH value to 8.0 with concentrated ammonia water, and the current density is 0.1A / dm ...

Embodiment 2

[0024] (1) With embodiment 1.

[0025] (2) Preparation of electroplating solution: 90g / L of nickel sulfate, 25g / L of sodium tungstate, 30g / L of boric acid, 35g / L of sodium citrate, 9g / L of ferrous sulfate and 10g / L of citric acid. Dissolve the required amount in a small amount of water, then mix and stir evenly in order, dilute with water to the specified amount in the plating tank and stir evenly, then adjust the pH value to 7.8 with concentrated ammonia water, and the current density is 0.2A / dm 2 Electrolysis for 8 hours.

[0026] (3) Electroplating implementation process: raise the temperature of the prepared electroplating solution to 80°C, and keep the pH value stable at 7.8 during the electroplating process. Current density 8A / dm 2 . The anode is made of stainless steel with strong corrosion resistance. The electroplating speed is 4μm / h, and a bright nickel-tungsten-boron-iron alloy coating is formed on the surface of the piston ring. The coating thickness is 25 μm....

Embodiment 3

[0030] (1) With embodiment 1.

[0031] (2) Preparation of electroplating solution: 40g / L of nickel sulfate, 45g / L of sodium tungstate, 25g / L of boric acid, 40g / L of sodium citrate, 15g / L of ferrous sulfate and 6g / L of citric acid. Dissolve the required amount in a small amount of water respectively, then mix and stir evenly in order, dilute with water to the specified amount in the plating tank and stir evenly, then adjust the pH value to 8.4 with concentrated ammonia water, and the current density is 0.2A / dm 2 Electrolysis for 7 hours.

[0032] (3) Electroplating implementation process: raise the temperature of the prepared electroplating solution to 70°C, and keep the pH value at 8.4 during the electroplating process. Current density 5A / dm 2 . The anode is made of stainless steel with strong corrosion resistance. The electroplating speed is 3μm / h, and a bright nickel-tungsten-boron-iron alloy coating is formed on the surface of the piston ring. The coating thickness is ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention relates to a wear-resisting cladding of a piston ring of an internal combustion engine. The wear-resisting cladding is characterized in that the wear-resisting cladding is a nickel tungsten ferroboron cladding. Electroplate solution consists of 30 to 100g / L of nickel sulfate, 25 to 45g / L of sodium tungstate, 20 to 30g / L of boric acid, 20 to 40g / L of sodium citrate, 8 to 15g / L of ferrous sulfate and 5 to 15g / L of citric acid. The wear-resisting cladding adopts electrochemical plating to substitute the nickel tungsten ferroboron for hard chromium, which does not cause pollution. In addition, the wearing resistance of the piston ring is higher than a hard chromium cladding. The invention also provides the plating procedures of the wear-resisting cladding. After being pre-plated, the piston ring is placed in electrochemical plating solution under 60 to 80 DEG C. In the process of the electrochemical plating, PH remains 7.8 to 8.4 and current density remains 4 to 9A / dm<2>.

Description

technical field [0001] The invention belongs to the technical field of electroplating, and in particular relates to an anti-wear coating of an internal combustion engine piston ring and an electroplating process thereof. Background technique [0002] Piston rings, as wear-resistant parts of internal combustion engines, have been relying on electroless hard chromium plating and electroplating hard chromium plating for many years. The two methods have high energy consumption, serious pollution, and produce a large amount of waste water containing chromium ions. After discharge, it will cause serious pollution to rivers, especially ground water sources. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide an anti-friction coating for internal combustion engine piston rings and its electroplating process. The coating has higher wear resistance than hard chromium coating and has no environmental pollution in the productio...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): F16J9/00C25D3/56
Inventor 曹新忠
Owner 曹新忠