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Method for preparing high-wear-resistance self-lubricating composite oxide film on surface of aluminum alloy friction part

A composite oxide film and aluminum alloy surface technology, applied in the field of materials, can solve problems such as limitations, and achieve high wear resistance, improved toughness, and good wear resistance.

Inactive Publication Date: 2013-03-20
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The traditional hard anodic oxidation technology on the surface of aluminum alloys cannot meet the requirements for the preparation of highly wear-resistant and self-lubricating films. It is necessary to study new technologies from the aspects of oxidation power supply, oxidation solution composition, and film structure.
The improvement of the wear resistance of the oxide film is generally achieved by using a new oxidation power source and co-deposited particles to enhance the hardness of the film, and the improvement of the self-lubricating properties of the oxide film is mainly based on the porosity of the anodic oxide film. Use solid lubricating materials to seal holes and surface-coat polymer substances to improve its friction performance, such as lubricating grease impregnation method, Teflon processing method, but due to the small pore size of the oxide film and the limitation of the surface immersion depth, the use of pore composite method is restricted

Method used

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  • Method for preparing high-wear-resistance self-lubricating composite oxide film on surface of aluminum alloy friction part
  • Method for preparing high-wear-resistance self-lubricating composite oxide film on surface of aluminum alloy friction part
  • Method for preparing high-wear-resistance self-lubricating composite oxide film on surface of aluminum alloy friction part

Examples

Experimental program
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Effect test

Embodiment 1

[0035] (1) Pour 3L of deionized water into the oxidation tank, slowly add 900g of sulfuric acid into the water and keep stirring to form a sulfuric acid solution, then add 25g of oxalic acid and 25g of sulfosalicylic acid into the solution and stir to fully dissolve, then add 50g of acetic acid Add sodium and stir, pour 25g of aluminum sulfate into a beaker of 100ml of deionized water, heat and dissolve it, and then add it to the previous electrolyte, add 25ml of glycerin and 2.5g of surfactant into the electrolyte and mechanically stir for 30 minutes; Dilute the volume of ionized water to 5L, mechanically stir for 1h to make it fully mixed; make the concentration of each component equal to that of sulfuric acid H 2 SO 4 180g / L, oxalic acid C 2 h 2 o 4 5g / L, sulfosalicylic acid C 7 h 6 o 6 S·2H 2 O5g / L, glycerol C 3 h 8 o 3 5ml / L, surfactant C 12 h 25 C 6 h 4 NaO 3 S0.5g / L, sodium acetate CH 3 COONa10 g / L, aluminum sulfate Al 2 (SO 4 ) 3 5 g / L; no nano-Al wa...

Embodiment 2

[0039] (1) Prepare 5L electrolyte for composite anodizing:

[0040] (a) Pour 3L of deionized water into the oxidation tank, slowly add 900g of sulfuric acid into the water and keep stirring to form a sulfuric acid solution, then add 25g of oxalic acid and 25g of sulfosalicylic acid into the solution and stir to fully dissolve, then add 50g of acetic acid Add sodium and stir, pour 25g of aluminum sulfate into a beaker of 100ml of deionized water, heat and dissolve, then add to the former electrolyte, add 25ml of glycerin and 2.5g of surfactant into the electrolyte and mechanically stir for 30min;

[0041] (b) Pretreatment of composite particles: prepare 500ml of composite surfactant solution, in which the concentration of sodium dodecylbenzenesulfonate A.B.S is 0.6g / L, and the concentration of alkylphenol polyoxyethylene ether OP-10 is 0.4g / L; then 15g nanometer Al 2 o 3 Powder (Al 2 o 3 The particle size is 500nm) and poured into the prepared composite surfactant solution...

Embodiment 3

[0046] (1) Prepare 5L electrolyte for composite anodizing:

[0047] (a) Pour 3L of deionized water into the oxidation tank, slowly add 900g of sulfuric acid into the water and keep stirring to form a sulfuric acid solution, then add 25g of oxalic acid and 25g of sulfosalicylic acid into the solution and stir to fully dissolve, then add 50g of acetic acid Add sodium and stir, pour 25g of aluminum sulfate into a beaker of 100ml of deionized water, heat and dissolve, then add to the former electrolyte, add 25ml of glycerin and 2.5g of surfactant into the electrolyte and mechanically stir for 30min;

[0048] (b) Pretreatment of composite particles: prepare 500ml of composite surfactant solution, in which the concentration of sodium dodecylbenzenesulfonate A.B.S is 0.6g / L, and the concentration of alkylphenol polyoxyethylene ether OP-10 is 0.4g / L; then 20g nanometer Al 2 o 3 Powder (Al 2 o 3The particle size is 500nm) and poured into the prepared composite surfactant solution,...

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Abstract

The invention belongs to the technical field of materials, and particularly relates to a method for preparing a high-wear-resistance self-lubricating composite oxide film on the surface of an aluminum alloy friction part. The method comprises the following steps: preparing a composite electrolyte for anodic oxidation; sanding and degreasing the surface of an aluminum alloy, and performing alkaline etching, ash removal and chemical polishing pretreatment; performing composite anodic oxidation treatment to prepare an oxide film, and detecting the hardness; and if the sample does not reach the required hardness, performing heat treatment on the composite oxide film. According to the invention, an oxidization liquid system composed of three acids is designed; the oxide film having high growth speed, high hardness, high wear resistance and high strength and toughness can be grown based on characteristics of pulse current oxidization; and the composite oxide film has higher wear resistance and favorable self-lubricating property through the heat treatment on the oxide film, thereby being applicable to the preparation of oil-free or oil-less lubricating friction parts under different friction conditions (high-speed light load or low-speed heavy load) in the industries of sewing, food, textile, automobiles and the like.

Description

[0001] technical field [0002] The invention belongs to the technical field of materials, and in particular relates to a method for preparing a high wear-resistant self-lubricating composite oxide film on the surface of an aluminum alloy friction part. Background technique [0003] Due to the characteristics of good thermal conductivity, light weight, and low noise in use, aluminum alloys are widely used in the preparation and application of mechanical friction parts (shafts, rods) after the surface is anodized to form a hard oxide film. After anodic oxidation treatment, its surface hardness and wear resistance are greatly improved, but if it is used as a friction part material, it still has disadvantages such as high friction coefficient and poor lubricating performance. With the need for environmental friendliness to reduce oil lubrication for friction parts, it is an urgent need to study new technologies for the preparation of anodic oxide films on aluminum alloy surface...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/04
Inventor 陈岁元刘常升梁京王静
Owner NORTHEASTERN UNIV
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