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Sliding memberss

A technology for sliding parts and aluminum alloys, applied in the coating process of metal materials, etc., can solve the problems of low forming speed, high cost, and improved wear resistance

Inactive Publication Date: 2009-10-14
SUZUKI MOTOR CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has disadvantages in that it requires power supply equipment and is expensive due to the low rate of film formation
[0005] On the other hand, aluminum pistons, which are E / G components, have tin-plated sides, and while the deposited tin film is soft and can contribute to a good initial fit, it cannot be expected to improve wear resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] 0.67 parts by weight of magnesium fluorosilicate (MgSiF) are dissolved in 100 parts by weight of water 6 ·6H 2 O), and 0.33 parts (by weight) of ammonium fluorosilicate [(NH 4 ) 2 SiF 6 ]. The prepared solution was heated to 90°C and used as a treatment solution.

[0068] The AC8A-T6 cast aluminum sample with a diameter of 50 mm and a thickness of 5 mm was cleaned with an organic solvent and a degreasing agent, and then immersed in the above treatment solution for surface treatment. On the cast aluminum sample after surface treatment, a thin film composed of Al-OH-F compound was formed on the surface.

[0069] For the above-mentioned treated sample of the present invention, wear test is carried out on a ball-disc wear tester, and the abrasive material is heat-treated SCM435. The cross-sectional shape (or profile) of the formed scratch is shown in Figure 4 middle. Similarly, the ball-disk wear test was also carried out on the sample (material AC8A-T6) without fi...

Embodiment 2

[0073] After cleaning an engine piston (material is AC8A-T6) with organic solvent and degreasing agent etc., dip in the same treatment solution as described in Example 1, surface treatment for 5 minutes. A thin film composed of Al-OH-F compound is formed on the surface of the piston.

[0074] The piston treated according to the surface treatment method of the present invention (ie, the piston of Example 2), and a piston without surface treatment (ie, an untreated piston) were installed in the engine. The engine is actually running at full load.

[0075] After running, remove each piston and inspect its surface condition. Inspection items include: adhesion of aluminum to the ring, scratches on the surface of the pin hub, and scratches on the surface of the side edge.

[0076] The results obtained are shown in Table 1.

[0077] Table 1

[0078] Piston in Example 2

[0079] As a result, the surface-treated pistons according to the present invention have improved r...

Embodiment 3

[0081] Surface treatment of AC8A and ADC12 was carried out in the same manner as in Example 1. Then, their corrosion resistance was evaluated by salt water spray test.

[0082] It can be seen from the obtained results that the surface treatment film in the present invention has a protective effect; the surface treatment method in the present invention can improve the corrosion resistance of the aluminum base material.

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Abstract

The present invention provides a sliding part made of base metal including aluminum or aluminum alloy, wherein the entire surface of the sliding part or its sliding surface is coated with a sliding film, the sliding film comprising: a layer made of aluminum , a film composed of a compound of fluorine and hydroxide groups, a film composed of a hydrate of this compound, a film composed of a NH4MgAlF6 compound, or a film composed of a mixture of these compounds, and the sliding film Has a cubic crystal structure and no crystallographic orientation. Preferably, the sliding film is a thin film containing NH4MgAlF6 compound.

Description

[0001] This application is a divisional application of Chinese patent application 02107851.3 with a priority date of October 31, 1997 and an invention title of "sliding component". technical field [0002] The present invention relates to a sliding part having a surface treatment film for aluminum or an aluminum alloy. Background technique [0003] More specifically, the present invention relates to a surface treatment method. The method requires simple equipment, reduces processing costs, and can produce aluminum or aluminum alloys with excellent wear resistance, corrosion resistance and other properties; it also relates to a piston subjected to surface treatment according to the method. The present invention also relates to a surface treatment film which is suitable for use on the sliding surface (or bushing surface) of an internal combustion engine and which has excellent wear resistance, initial fit, oil retention and other properties, and also relates to a surface cover...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/34C23C22/66
Inventor 三保家诚野村雅也密冈重日
Owner SUZUKI MOTOR CORP