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Composite chromium plating film and sliding member having the same and method for manufacture thereof

一种铬电镀、滑动件的技术，应用在发动机元件、机械设备、光学元件等方向，能够解决电镀膜低强度、低抗磨损性、电镀膜不均匀分布密度微裂纹等问题，达到油膜厚度优异、优异抗磨损性、优异润滑油保持性的效果

Inactive Publication Date: 2006-04-26
RIKEN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the plated film thus obtained has microcracks with uneven distribution density, and part of the plated film has low strength and low abrasion resistance, making it difficult to put this plated film into practical use

Method used

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  • Composite chromium plating film and sliding member having the same and method for manufacture thereof
  • Composite chromium plating film and sliding member having the same and method for manufacture thereof
  • Composite chromium plating film and sliding member having the same and method for manufacture thereof

Examples

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Embodiment 1 to 4

[0106] In the same manner as in Reference Example 1, a square cross-section bar (5 mm x 5 mm x 20 mm) made of carbon tool steel (SK-5) was polished and then degreased. The rods of these square cross-sections were subjected to pretreatment, chrome plating and counter voltage treatment in the same manner as in Example 1, except that they were immersed in a composite electroplating bath having the composition shown in Table 1, and the counter voltage treatment The current density during voltage treatment is constant 20A / dm 2 . The cycle consisting of the electroplating step and the counter voltage treatment step was repeated 12 times in total to form a 120 μm thick composite chromium electroplating film. Table 2 shows the surface ratio of microcracks, distribution density and composite ratio of hard particles in the obtained test pieces.

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Abstract

A composite chromium electroplated film containing hard particles in network microcracks, the microcracks account for 10 to 20 area % of the surface, the distribution density of microcracks is 1,200 to 2,500 lines / cm, and the amount of the above-mentioned hard particles 1 to 15% by mass / 100% by mass of the above-mentioned entire plating film. This composite chrome plating provides excellent wear and mar resistance and low impact to mating parts.

Description

field of invention [0001] The invention relates to a composite chromium electroplating film containing hard particles in network microcracks, a sliding part with the electroplating film, and its preparation method. Background of the invention [0002] Due to the need for more powerful, more fuel efficient internal combustion engines, there has recently been an increasing demand for piston ring vis-à-vis mounted cylinder liners with improved galling and wear resistance. To meet this demand, piston rings are coated with a chromium plating film. However, conventional chromium-plated piston rings do not exhibit sufficient galling and wear resistance when used in engines subjected to high thermal loads and severe wear, such as diesel engines and leaded gasoline engines. [0003] It has therefore been proposed to provide a chromium plating film capable of retaining oil for a long time through microcracks extending not only on the surface but also inside. For example, JP 10-53881...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D15/02C25D3/04C25D3/10C25D5/14C25D5/18C25D7/00C25D7/10F02F5/00F16J9/26
CPCC25D3/04C25D3/10C25D5/14C25D5/18C25D7/10C25D15/02C25D5/625F16J9/26Y10S428/935Y10T428/12014Y10T428/12028Y10T428/12806Y10T428/12847Y10T428/12993
Inventor 押见武雄奥清高泷口胜美
Owner RIKEN CO LTD
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