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Bearing bush alloy layer working surface fluoride-free and lead-free double-layer alloy plating structure and plating technology

A technology of alloy coating and working surface, applied in the field of bearing bush processing, can solve the problems of poor performance and short service life of bearing bush coating, and achieve the effects of high corrosion resistance, extended service life and consistent color

Inactive Publication Date: 2012-10-31
WUHU MEIDA MECHANICAL & ELECTRONICS INDAL
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  • Abstract
  • Description
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Problems solved by technology

[0003] The purpose of the present invention is to provide a double-layer alloy coating structure and coating process on the working surface of the bearing pad alloy layer to solve the problems of short service life and poor performance of the bearing pad coating in the prior art

Method used

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  • Bearing bush alloy layer working surface fluoride-free and lead-free double-layer alloy plating structure and plating technology

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Embodiment Construction

[0014] Bearing pad alloy layer The double-layer alloy coating structure of the working surface includes a bearing pad 4, and the inner surface of the bearing pad 4 is coated with double-layer tin-copper alloy coatings 3 and 2, and the inner layer of the tin-copper alloy coating layer 3 that is close to the inner circle of the bearing pad The copper content is higher than the copper content in the outer tin-copper alloy coating 2, the weight ratio of copper in the inner tin-copper alloy coating 3 close to the inner circle of the bearing bush is 10%, the weight ratio of tin is 90%, and the outer tin-copper alloy coating In 2, the weight ratio of copper is 3%, and the weight ratio of tin is 97%, and a pure white tin layer 1 is also plated on the alloy coating layer 2 of the outer layer system.

[0015] The double-layer alloy coating process on the working surface of the alloy layer of the bearing bush includes the following steps:

[0016] (1) Firstly, ultrasonic cleaning is used...

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Abstract

The invention discloses a bearing bush alloy layer working surface double-layer alloy plating structure and a plating technology; and after an electroplating technology is adopted, double Tin-Cu alloy plating layers are plated on the bearing bush inner circle, wherein the Cu content of the inner plating layer is more than that of the outer plating layer. Therefore, the service life of a bearing bush is effectively prolonged, and the performance of the bearing bush is improved.

Description

technical field [0001] The invention relates to the field of bearing bush processing, in particular to a double-layer alloy coating structure and coating process on the working surface of the alloy layer of the bearing bush. Background technique [0002] The coating on the working surface of the alloy layer of the engine bearing bush is basically electroplated with lead-based series alloys with fluorine-containing and lead-containing plating solutions. Due to the soft surface coating of the lead-containing alloy, the matrix structure is easily damaged, which reduces the mechanical strength and leads to fatigue resistance, and is easily corroded and deteriorated, and the surface is easily oxidized and discolored, which reduces the use of the bearing bush. life. And because the plating solution contains a large amount of fluorine and lead ions, it will pollute the working environment and the natural environment, and the wastewater treatment is more complicated and the treatme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/60C25D5/10F16C33/04
CPCY02T10/865
Inventor 李文兵文静波
Owner WUHU MEIDA MECHANICAL & ELECTRONICS INDAL
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