Method for growing abrasion-proof antifriction ceramic film on stannum, aluminum alloy surface in situ

An aluminum alloy surface, in-situ growth technology, applied in anodizing and other directions, can solve the problems of poor wear resistance of tin-aluminum alloy, and achieve excellent wear resistance, high wear resistance, and good uniformity.

Inactive Publication Date: 2008-07-16
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the disadvantage of poor wear resistance of tin-aluminum alloy, the present invention proposes a method for in-situ growth of wear-resistant and anti-friction ceramic film on the surface of tin-aluminum alloy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0009] Specific implementation mode one: the method for in-situ growth of wear-resistant and anti-friction ceramic film layer on the surface of tin-aluminum alloy, its steps are as follows:

[0010] Step 1: Dissolve 2-12g / L sodium silicate and 0-2g / L sodium fluoride in distilled water to make electrolyte;

[0011] Step 2: Put the tin-aluminum alloy with the oxide film removed in the electrolyte as the anode, and the stainless steel plate as the cathode, and control the temperature of the electrolyte to 15-40°C; turn on the power, adjust the peak voltage between -200-600V, and positive Negative phase current density value is 8~30A / dm 2 , the frequency is 50-200Hz, and the power-on response time is 5-40min under constant current conditions;

[0012] Step 3: Rinse the surface with water after taking it out, and dry it naturally or at 80-100°C.

specific Embodiment approach 2

[0013] Embodiment 2: The difference between this embodiment and Embodiment 1 is that in step 1, the oxide film is removed by chemical light pre-treatment or polished with SiC sandpaper. Other components and steps are the same as those in Embodiment 1. The process of removing the oxide film by chemical light pretreatment is mechanical polishing→chemical degreasing→hot water cleaning→cold water cleaning→chemical polishing→hot water cleaning→cold water cleaning→lighting→cleaning→drying, as shown in Table 1:

[0014] Table 1 Process parameters of degreasing, polishing and light emitting aluminum alloy

[0015] method

[0016] The process of using SiC sandpaper to remove the oxide film is to first polish it with 400-grit sandpaper for 10 minutes, then polish it with 800-grit sandpaper for 8 minutes, then polish it with 1000-grit sandpaper for 4 minutes, and finally rinse it and dry it before use. The remaining steps and parameters are the same as in the first embodiment...

specific Embodiment approach 3

[0017] Embodiment 3: The difference between this embodiment and Embodiment 1 lies in the 4-10 g / L sodium silicate in step 1. The other steps and parameters are the same as in Embodiment 1.

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Abstract

A method for an in-situ grown wear resistance and anti-friction ceramic coating on the surface of tin-aluminium alloy relates to the method for preparing the ceramic coating on the surface of tin-aluminium alloy and solves the disadvantage of poor wear resistance of tin-aluminium alloy. The steps of the method are as follows: (1) Sodium silicate of 2 to 12g/L and sodium fluoride of 0 to 2g/L are dissolved in distilled water, forming electrolyte; (2) tin-aluminium alloy, the oxide film of which is removed, is arranged in the electrolyte as the anode, and a stainless steel plate is the cathode, and the temperature of the electrolyte is controlled to be 15 to 40 DEG C; power is switched on and the peak value voltage is adjusted between minus 200 volt and 600 volt, and the positive and negative phase current density is 8 to 30 ampere/dm<2>, and the frequency is 50 to 200 Hz, and the reaction time is 5 to 40 min while electrifying in constant current condition; (3) The surface is cleaned by water after being fetched out and is dried naturally or at the temperature of 80- 100 DEG C. The ceramic coating of the invention has the advantages of wear resistance, anti-friction, corrosion resistance, heat resistance, good electrical resistance property, good uniformity of the ceramic coating and high bonding strength with the matrix owning to the in-situ growth of the ceramic coating on the matrix.

Description

technical field [0001] The invention relates to a method for preparing a ceramic film layer on the surface of a tin-aluminum alloy, in particular to a method for in-situ growth of a wear-resistant and friction-reducing ceramic film layer on the surface of a tin-aluminum alloy. Background technique [0002] With the development of the automobile industry, the emission requirements for high-power, high-speed engines and countries around the world have increased. The internal combustion engine bearing material not only needs to meet compliance and corrosion resistance, it must also meet other properties, such as good bearing capacity and fatigue strength, etc. The title of the invention is "Method and Device for Microarc Oxidation Plating Metal Surface", the publication number is CN1311354, and the Chinese invention patent with the publication date of 2001.09.05 discloses a method for preparing a film layer on the surface of an alloy by a micro-plasma oxidation method. The met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/02
Inventor 姜兆华王志江王福平
Owner HARBIN INST OF TECH
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