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Method for acquiring ceramic layer on iron base, copper base material surface

A ceramic layer, copper-based technology, applied in the metal material coating process, superimposed layer plating, coating, etc., can solve the problem of affecting the surface hardness, corrosion resistance and high temperature oxidation resistance of metal materials, limitations, and long processing time And other problems, to achieve significant economic and social benefits, improve service life, good surface quality effect

Inactive Publication Date: 2008-06-11
DALIAN JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the hot-dip aluminum technology adopted on the surface of the iron-based material, the surface of the aluminum-dipped layer is relatively rough, although the aluminum-dipped layer is completely or partially transformed into Al after anodic oxidation treatment. 2 o 3 At the same time, the relatively rough surface quality of the ceramic layer will be improved to a certain extent, but the surface quality of the ceramic layer is still difficult to reach a high level, so the application of this method on iron-based materials is limited to a certain extent.
Although the patent "Anodizing Method for Improving the Hardness and Corrosion Resistance of Electroplated Aluminum Layer on Metal-Based Surface" (Application No.: 200710012270.4) adopts molten salt electroplating aluminum technology and anodizing treatment method to obtain high surface quality and Al with excellent properties such as good stability and high density 2 o 3 ceramic layer, but the above two get Al 2 o 3 The anodic oxidation treatment method of the ceramic layer is due to the principle of its own treatment method, which makes it difficult to obtain a deeper thickness of Al on the surface of the metal material even under the condition that the surface has a deeper thickness of the aluminized layer. 2 o 3 Ceramic layer, thus affecting the further improvement of the hardness, corrosion resistance and high temperature oxidation resistance of the metal material surface
In addition, in order to obtain a certain thickness of Al 2 o 3 Ceramic layer, if the anodic oxidation treatment method is used, the processing time required is also longer, so these shortcomings of the anodic oxidation treatment method have seriously affected the production efficiency and application range of the above two methods in actual production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: Q235 steel is subjected to conventional 50~60g / L sodium hydroxide (NaOH), 20~30g / L sodium carbonate (NaOH) 2 CO 3 ), 30-40g / L trisodium phosphate (Na 3 PO 4 12H 2 O) and 5~10g / L water glass (Na 2 SiO 3 ) after the degreasing treatment at 90°C in the mixed solution and the rust removal and surface activation treatment in the 200-300g / L industrial hydrochloric acid solution, the low-temperature KCl+NaCl+AlCl at a temperature of 150°C 3 In the mixed molten salt, the current density of Q235 steel is 3.99A / dm 2 The electroplating treatment makes the surface obtain a smooth and dense electroplated aluminum layer. The Q235 steel with an electroplated aluminum layer on the surface is heated at 500°C and chemically polished in a mixed solution of nitric acid, phosphoric acid and sulfuric acid for 3 minutes, and then placed in a mixture of 2g / L sodium hydroxide and phosphate (10g / L Sodium hexametaphosphate, 8g / L water glass) was subjected to micro-arc oxidati...

Embodiment 2

[0021] Embodiment two: pure copper is subjected to conventional 10~15g / L sodium hydroxide (NaOH), 20~30g / L sodium carbonate (NaOH) 2 CO 3 ), 50~60g / L trisodium phosphate (Na 3 PO 4 12H 2 O) and 5~10g / L water glass (Na 2 SiO 3) after the degreasing treatment at 70°C in the mixed solution and the rust removal and surface activation treatment in the 150-200g / L sulfuric acid solution, first obtain a certain thickness of electroplated aluminum layer on the surface of pure copper by molten salt electroplating. The molten salt system used in electroplating is KCl+NaCl+AlCl 3 , the temperature is 150℃, the current density is 3.99A / dm 2 . The obtained electroplated aluminum layer was subjected to a high-temperature heat treatment at 300° C. and a chemical polishing treatment for 3 minutes in a mixed polishing solution composed of nitric acid, phosphoric acid and sulfuric acid. Then put the pure copper with an electroplated aluminum layer on the surface in a silicate alkaline so...

example 3

[0022] Example 3: HT200 gray cast iron is subjected to conventional 50-60g / L sodium hydroxide (NaOH), 20-30g / L sodium carbonate (NaOH) 2 CO 3 ), 30-40g / L trisodium phosphate (Na 3 PO 4 12H 2 O) and 5~10g / L water glass (Na 2 SiO 3 ) in the mixed solution at 90°C for degreasing and for rust removal and surface activation in 200-300g / L industrial hydrochloric acid solution, a layer of smooth and compact surface of HT200 gray cast iron is obtained by high-temperature molten salt electroplating. Electroplated aluminum layer. The molten salt system used is KCl+NaCl mixed molten salt, the treatment temperature is 800°C, and the current density is 2.66A / dm 2 . The HT200-40 cast iron with an electroplated aluminum layer on the surface is subjected to a high-temperature heating treatment at 700 ° C, and then a 3-min chemical polishing treatment in a mixed polishing solution composed of nitric acid, phosphoric acid and sulfuric acid. Then put the HT200 gray cast iron with an elec...

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Abstract

The invention relates to a method for obtaining ceramic layer on the surface of iron base and copper base material, which comprises the following steps: the conventional oil removal and derusting treatment is performed to the iron base and copper base material, after a layer of glossy and smooth electroplating aluminum layer is obtained through high temperature molten salt electroplating aluminum or low temperature molten salt electroplating aluminum, then the high temperature heating and chemical polishing treatment is performed to the iron base and copper base material with electroplating aluminum layer on the surface, and also the micro- arc oxidation treatment is performed, and the electroplating aluminum layer on the surface is totally or partially converted into Al2O3, and at last, the Al2O3 ceramic layer with a specific thickness is obtained on the surface of the iron base and copper base material. Through the process of the invention, the hardness, the corrosion resistance, and the high temperature oxidation resistance of the surface of the iron and copper base material can be greatly improved, thereby, the application range of the iron and copper base material is extended; also because the invention has the advantages of good surface quality, high production efficiency, and simple technology, the obvious economic benefit and social benefit can be generated.

Description

technical field [0001] The invention relates to a metal material surface modification process, in particular to a method for obtaining a ceramic layer on the surface of iron-based and copper-based materials. Background technique [0002] Metal materials are the most widely used engineering materials today, especially iron-based and copper-based materials occupy an extremely important position in production, construction and daily life. However, due to the iron-based and copper-based materials themselves and the influence of the environmental medium during service, it is inevitable that corrosion, high-temperature oxidation and other forms of damage will occur on the surface, so the service life of the iron-based and copper-based materials is damaged. At the same time, it also caused huge economic losses to human beings. During the service of many metal materials, most of the damage occurs on the surface of the material. Therefore, improving the surface properties of materi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C28/02C25D11/04
Inventor 丁志敏沈长斌阎颖陈凯敏高宏
Owner DALIAN JIAOTONG UNIVERSITY