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Surface roughening method of metal material

A metal material and surface roughening technology, applied in the field of material processing engineering, can solve the problems of high energy consumption, affecting safe production, hidden danger of by-product explosion, etc., and achieve the effects of low technology application cost, elimination of potential hazards, and easy availability of raw materials

Inactive Publication Date: 2013-08-28
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing surface roughening methods for metal materials mainly include chemical and physical methods, and there are the following main problems: First, chemical methods rely too much on strong acids (such as sulfuric acid, nitric acid, phosphoric acid or their mixtures, etc.), strong alkalis (such as sodium hydroxide ) and other highly corrosive chemical reagents are not only not eco-friendly, but also extremely harmful to operators, plants and equipment, and the by-product (hydrogen) has a potential explosion hazard, which affects safe production; second, physical methods (such as Shot peening, sand blasting, etc.) have major disadvantages such as high equipment and raw material costs, high energy consumption, and extremely limited processing capabilities for workpieces with complex geometric shapes.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Taking AZ91 magnesium alloy as the research object. Using distilled water as solvent, prepare 20.0g / L sodium chloride solution as anodic polarization electrolyte. Connect the equal-area samples to the wires, then connect them to the two output ports of the sinusoidal AC power supply, and then immerse them in the above-mentioned electrolyte with a temperature control of 25°C, keep the distance between the samples at 3cm, and use a constant current of 1.0mA / cm at 50Hz 2 Treat for 30min. After washing with water and drying, it was found that the surface of the sample was evenly distributed with finely divided pits with the same size and depth visible to the naked eye, which confirmed that the surface of the material was obviously roughened.

Embodiment 2

[0025] Taking AZ91 magnesium alloy as the research object. The preparation of the anodic polarization solution was the same as in Example 1 except that the concentration of sodium chloride was changed to 0.02g / L. Connect the equal-area samples to the wires and connect them to the positive and negative output ports of the DC power supply respectively, and then immerse them in the above-mentioned electrolyte solution with a temperature control of 40°C, keep the distance between the samples at 5cm, and treat at a constant voltage of 2V for 15min. After washing and drying, it was found that the surface of the sample connected to the positive output port of the DC power supply was uniformly distributed with finely divided pits that were basically the same size and depth visible to the naked eye, confirming that the surface of the material was obviously roughened.

Embodiment 3

[0027]Taking AZ91 magnesium alloy as the research object. The preparation of the anodic polarization solution was the same as in Example 1 except that the concentration of sodium chloride was changed to 100g / L. Except that the counter electrode was changed to a stainless steel plate with the same area as the sample, other conditions of anodic polarization were controlled as in Example 1. After washing with water and drying, it was found that the surface of the sample was uniformly distributed with finely divided pits that were basically the same size and depth visible to the naked eye, which confirmed that the surface of the material was obviously roughened.

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Abstract

The invention relates to a surface roughening method of a metal material. According to the method, the metal material is subjected to anodic polarization in an electrolyte; the surface roughness of the metal material is increased by the anodic dissolution effect; the electrolyte is a water-based solution of sodium chloride of 0.02 to 100 g / L; and the anodic polarization mode is to externally add current or couple a cathodic dissimilar metal material. The method has the biggest advantages of environmental friendliness, high efficiency, energy conservation and low cost.

Description

technical field [0001] The invention belongs to the technical field of material processing engineering, and in particular relates to a method for surface roughening of metal materials. Background technique [0002] Surface modification is one of the important application technologies of materials, which plays a huge role in saving the cost of material manufacturing, improving the service performance of materials, and expanding the application fields of materials. Taking metal materials as an example, from traditional carbon steel to modern new materials represented by magnesium, aluminum, titanium, etc., their applications are all closely related to the development of surface modification technology. [0003] Surface roughening is a surface treatment technology to improve the micro-geometric shape of the material surface and increase the micro-roughness of the material. It is an important link to ensure the quality of product processing. For example, before coating (includi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25F3/02
Inventor 张永君高世杰沈军夏兰梅董连军李爱红贾书功陶胜
Owner SOUTH CHINA UNIV OF TECH
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