Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for improving corrosion resistance of aluminum-alloy micro-arc oxidation film

A micro-arc oxidation and corrosion resistance technology, applied in the field of surface engineering, can solve the problems of insufficient corrosion resistance of the micro-arc oxidation film, and achieve the effects of high hardness, high wear resistance and high bonding force

Inactive Publication Date: 2014-01-22
NANCHANG HANGKONG UNIVERSITY
View PDF2 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a power supply method for improving the corrosion resistance of aluminum alloy micro-arc oxidation film layers in order to solve the problems of insufficient corrosion resistance of micro-arc oxidation film layers in the current micro-arc oxidation technology

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for improving corrosion resistance of aluminum-alloy micro-arc oxidation film
  • Method for improving corrosion resistance of aluminum-alloy micro-arc oxidation film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Set the reverse duty cycle to 10%.

[0016] Before oxidation, the sample to be oxidized is cleaned with organic solvents such as ethanol to clean the surface oil, and then rinsed with deionized water and then oxidized; aluminum wire is used as the fixture, and the required shape is made according to the shape of the sample to ensure that During the micro-arc oxidation process, the fixture is in good contact with the sample; during the oxidation process, the temperature of the solution rises due to the action of high voltage and high current, and the micro-arc oxidation temperature should be controlled below 70 ° C, so circulating cooling water is required during the oxidation process Cool the solution.

[0017] Electrolyte parameters in micro-arc oxidation are: sodium silicate 5~15g / L, sodium polyphosphate 2~10g / L, sodium hydroxide 0~5g / L.

[0018] The electrical parameters of micro-arc oxidation are set as follows: AC asymmetric method, constant current, D k正向 =D k负...

Embodiment 2

[0022] Except that the reverse duty cycle is set to 30%, other is the same as embodiment 1.

[0023] The obtained phenomena and results are similar to those described in Example 1, but the thickness of the film layer is significantly reduced, and the surface roughness is also significantly reduced compared with that.

Embodiment 3

[0025] Except that the reverse duty cycle is set to 60%, other is the same as embodiment 1.

[0026] Obtained phenomena and results are similar to those described in Example 1.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a method for improving the corrosion resistance of an aluminum-alloy micro-arc oxidation film. The method comprises the following processing steps: respectively connecting a pretreated piece subjected to surface treatment and an anticathode of stainless steel with an output port of a power supply and soaking into micro-arc oxidizing electrolyte for performing micro-arc oxidation, and then setting the reverse duty ratio of electric parameters in a manner of alternated current asymmetric power supply, controlling a proportion of the reverse duty ratio and adopting a periodic reverse duty ratio power supply method, thereby improving the corrosion resistance of the aluminum-alloy micro-arc oxidation film. The method provided by the invention can be used for excellently solving the corrosion resistance problem of the film, obviously improving the surface appearance of the film and obtaining the more uniform oxidation film with higher hardness and better compactness.

Description

technical field [0001] The invention belongs to the technical field of surface engineering, in particular to a method for improving the corrosion resistance of an aluminum alloy micro-arc oxidation film layer. Background technique [0002] Aluminum and its alloys are widely used, mainly due to its high specific strength and good workability, but its low hardness, poor wear resistance and corrosion resistance, are limited in some fields. In order to improve the comprehensive performance of aluminum alloy, surface treatment can be used. There are many surface treatment methods, such as: ordinary anodic oxidation, hard anodic oxidation and micro-arc oxidation. The anodic oxidation of aluminum alloy is relatively common, but in actual production, due to problems such as insufficient corrosion resistance of the film layer, the anodic oxidation technology is limited to a certain extent. In order to break through this bottleneck, in the early 1930s, Betz et al. reported for the fi...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/04C25D11/06
Inventor 周雅江溢民邵志松
Owner NANCHANG HANGKONG UNIVERSITY