Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Piston ring and method for producing same

A piston ring and annular technology, which is applied in the field of piston rings and its manufacturing, can solve the problems of adverse effects of the working environment, not easy to increase the film thickness, etc., achieve excellent long-term preservation, improve the working environment, and suppress the generation of microcracks Effect

Inactive Publication Date: 2015-12-09
NIPPON CHECMICAL IND CO LTD +2
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ammonium chloride in the plating solution may be decomposed to generate chlorine gas, so there is concern about adverse effects on the working environment
[0004] In addition, it is not easy to increase the thickness of the plating film formed by using trivalent chromium, and it is difficult to say that a practical plating solution can be supplied for piston ring applications that require a thick plating film.

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Piston ring and method for producing same
  • Piston ring and method for producing same
  • Piston ring and method for producing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～3 and comparative example 1 and 2

[0067] The components shown in Table 1 below were added to water to prepare a trivalent chromium plating solution having the composition shown in the table. Using the obtained plating solution, electroplating was performed under the conditions shown in the table to form a plated film on the surface of the base material. As the anode, a high-density graphite plate is used. As the cathode, low-chromium steel, which is one of the base materials of piston rings, is used.

[0068] In addition, as the base material for plating, low-chromium steel (front end 10R with size 5×5×20) is used for wear resistance evaluation of the plating film, etc., and SUS304 (size 50×100×5mm) is used for corrosion resistance sex evaluation. After the plating treatment, the obtained plated product was heat-treated at 200° C. for 30 minutes in the air, and then each evaluation was performed.

Embodiment 4

[0109]Prepare a plating solution with trivalent chromium having the same composition as in Example 1 except that scale-like molybdenum disulfide particles with an average thickness of 1 μm and an average diameter of 6 μm at 30 g / liter are added as particles with self-lubricating properties. The same method as Example 1 was used to make a piston ring with coating. The scanning electron micrograph of the longitudinal section of the manufactured piston ring is shown in Figure 4 . Figure 4 The dark parts are molybdenum disulfide particles, and it was confirmed that a good plating film was formed in which scale-like molybdenum disulfide particles were arranged laterally so as to block current. The surface friction of this coating was measured, and the value was 23% of the surface friction of the coating of Example 1. In addition, a piston ring was produced using the same plating solution as in Example 1 except that spherical molybdenum disulfide particles having an average part...

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
particle sizeaaaaaaaaaa
thicknessaaaaaaaaaa
diameteraaaaaaaaaa
Login to View More

Abstract

Provided is a trivalent chromium plating solution that can form a chromium plating having superior film characteristics such as corrosion resistance and wear resistance and that effectively suppresses the occurrence of macro-cracks in the plating film even in heating processing conditions on the order of 200-300°C. The trivalent chromium solution is characterized by comprising an aqueous solution containing a trivalent chromium compound, a pH buffer, a sulfamic acid salt compound, an amino carbonyl compound, and a complexing agent selected from a dicarboxylic acid or a salt thereof.

Description

technical field [0001] The present invention relates to a piston ring with chrome plating and a method for producing the same. Background technique [0002] Chromium plating has high hardness and low coefficient of friction, so it is widely used in sliding members such as piston rings that require wear resistance. However, a large amount of hexavalent chromium is often used in the plating solution used in this plating. Since there is concern about the influence of hexavalent chromium on the human body, development of a plating solution using trivalent chromium with less concern has been desired. [0003] As a plating solution using trivalent chromium, for example, Patent Document 1 describes using a plating solution composed of chromium chloride hexahydrate, boric acid, glycine, ammonium chloride, and aluminum chloride hexahydrate. This plating solution has the advantage of being able to obtain a good plating surface. However, ammonium chloride in the plating solution may...

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 Applications(China)
IPC IPC(8): C25D3/06C25D15/02
CPCC25D3/06C25D5/50C25D7/10C25D15/00F16J9/26C25D3/10
Inventor 品田学铃木正行村松晓高阶洋辅
Owner NIPPON CHECMICAL IND CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com