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Method of micro-arc oxidation for steel surface

A micro-arc oxidation, steel technology, applied in anodizing, arc welding equipment, manufacturing tools, etc., to achieve the effect of beautiful weld formation and high bonding strength

Inactive Publication Date: 2018-06-22
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of this invention is to propose a new method for micro-arc oxidation of iron and steel materials, the principle of which is to first weld a layer of aluminum layer with high bonding strength on the surface of the steel substrate through the aluminum-steel melting-brazing method, and then use micro-arc oxidation Technology to obtain ceramic layer, on the one hand, solve the problem of low bonding strength of ceramic layer on steel matrix, on the other hand, improve the corrosion resistance of steel

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Experimental program
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Effect test

Embodiment 1

[0020] Before welding, the steel plate and aluminum plate are polished brightly. The size of the Q235 steel plate is 200mm×100mm×3mm, and the size of the 5A06 aluminum alloy plate is 200mm×100mm×1.5mm. and cleaned with acetone. Tungsten argon arc welding machine is used, the steel plate is on the bottom, and the aluminum plate is on the top for welding. The welding form is as follows figure 1 shown. AlSi was used in the experiment 5 Welding wire is used as solder. In order to facilitate the tensile and shear performance test to detect the strength of the steel-aluminum bonding interface, a lap joint is used. The lap width is 10 mm, and the tungsten electrode is biased to the aluminum side by 2 mm. Different welding parameters are used, as shown in the table 2.

[0021] Table 2 welding parameters

[0022]

[0023] After welding, the weld seam is formed beautifully, and the specimen is subjected to tensile testing, and the specimen is broken at the weld seam, and the frac...

Embodiment 2

[0025] The test piece obtained by TIG melting-brazing was cut into a sample of 30mm×10mm×4.5mm, the surface was polished flat, and cleaned with acetone. The micro-arc oxidation equipment was used for the test, the parameters of the micro-arc oxidation process and the electrolyte parameters were: positive and negative 50% duty cycle, current density 10A / dm 2 , the frequency is 200Hz, 400Hz, 600Hz, 800Hz respectively, the micro-arc oxidation time is 30min, and the electrolyte is 1g / L KOH, 2g / L N a2 SiO 3 9H 2 O.

[0026] image 3 It is the cross-sectional morphology and EDS energy spectrum of the sample ceramic layer under the condition of micro-arc oxidation frequency of 400Hz. It can be seen from the figure that the ceramic layer is composed of a loose layer and a dense layer. The ceramic layer mainly contains aluminum, oxygen, silicon, and magnesium, among which the magnesium element mainly comes from the aluminum layer substrate, and the silicon and oxygen elements come...

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Abstract

The invention relates to a method of micro-arc oxidation for steel surface. The steel surface can obtain a compact ceramic layer through the method of micro-arc oxidation for the steel surface, and the method of micro-arc oxidation for the steel surface can be used for improving the anti-corrosion performance of steel. A layer of aluminum with high bonding strength is firstly welded to the surfaceof a steel substrate in an aluminum steel melting-braze welding method, then the ceramic layer is obtained through a micro-arc oxidation technology, the problem of low bonding strength of the ceramiclayer on the steel substrate is solved on the one hand, and the anti-corrosion performance of the steel can be improved on the other hand.

Description

technical field [0001] The invention relates to a method for micro-arc oxidation on the surface of steel, through which a dense ceramic layer is obtained on the surface of steel, which can be used to improve the corrosion resistance of steel. Background technique [0002] Micro-arc oxidation technology is a new surface treatment technology that has attracted much attention in recent years, and it is used to improve the wear resistance and corrosion resistance of materials. Usually, the micro-arc oxidation technology is mainly suitable for valve metals such as Al, Mg, Ti, Zr, Ta, Nb, etc., and the ceramic oxide film is grown in situ by using the principles of plasma chemistry and electrochemistry. The ceramic film prepared by the micro-arc oxidation method has wear resistance With the advantages of superior corrosion resistance, uniform thickness and color, simple process, high production efficiency, and environmental protection, it has broad application prospects in metal su...

Claims

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Application Information

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IPC IPC(8): C25D11/06C25D11/16B23K9/00B23K9/167B23K9/235B23K103/04B23K103/10
CPCC25D11/06B23K9/0026B23K9/167B23K9/235C25D11/026C25D11/16
Inventor 朱强陈文彬赵军雷玉成李天庆
Owner JIANGSU UNIV
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