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Micro fin-formation technique capable of improving aluminum-sol coating

An aluminum sol and coating technology, which is applied to the device, coating, pretreatment surface, etc. of coating liquid on the surface, can solve the problems of easy cracking, peeling off, poor affinity of aluminum glue, etc., and improve the conversion rate. and service life, the effect of improving bond strength

Inactive Publication Date: 2012-11-21
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, after excluding all the technical problems in the rolling, drawing and heat treatment of Fe-Cr-Al metal wire rods, this type of material has obvious problems in the coating of the catalyst connection layer, such as the coating process of aluminum glue. The bond strength defect, the coating is easy to crack and fall off, the main reason is the poor affinity between the material matrix and aluminum glue and the difference in thermal expansion coefficient

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] An iron-chromium-aluminum Fe-Cr-Al metal wire with a wire diameter of 0.5 mm, after the degreasing treatment, a suspension liquid with a particle size of 0.5 μm mixed with corundum fine powder is used as a medium to treat the surface of the iron-chromium-aluminum Fe-Cr-Al metal wire. The roughening treatment takes 5 minutes; immerse in aluminum glue with a solid content of 15%, stir up and down twice, remove the aluminum glue, blow off the excess aluminum glue with compressed air, and let it stand for 24 hours. Keep warm at this temperature for 4 hours, then cool to room temperature with the furnace.

[0018] Take out the treated metal wire rod from the furnace, weigh it, drop it freely on the ground from a height of about 1.5m, and weigh the difference in weight before and after weighing. At this time, the weight change of the coating falling off is greater than 5%.

Embodiment 2

[0020] A kind of iron-chromium-aluminum Fe-Cr-Al metal wire rod with a wire diameter of 0.5 mm, after the degreasing treatment, the surface of the iron-chromium-aluminum Fe-Cr-Al metal wire rod is treated by using a suspension liquid with a particle size of 50 μm mixed with corundum fine powder as a medium The time is 5 minutes for roughening treatment; the wire after the water blasting treatment is treated with a mixed acid solution containing 0.5mol / L phosphoric acid and 0.05mol / L nitric acid, and 0.2% aluminum glue is dissolved in it at a temperature range of 60°C. 0.5 hours of treatment to complete the surface microfinning treatment before applying the aluminum glue.

[0021] Then immerse in the aluminum glue with a solid content of 20%, stir up and down 3 times, remove the aluminum glue, blow off the excess aluminum glue with compressed air, and let it stand for 24 hours, then raise the temperature to 850°C step by step, and keep it at this temperature for 6 hours. Cool t...

Embodiment 3

[0024] A kind of iron-chromium-aluminum Fe-Cr-Al metal wire rod with a wire diameter of 0.5 mm, after the degreasing treatment, the surface of the iron-chromium-aluminum Fe-Cr-Al metal wire rod is treated by using a suspension liquid with a particle size of 20 μm mixed with corundum fine powder as a medium The time is 3 minutes for roughening treatment; the wire after the water blasting treatment is treated with a mixed acid solution containing 0.3mol / L phosphoric acid and 0.1mol / L nitric acid, and 0.1% aluminum glue is dissolved in it at a temperature range of 40°C. 8 hours of treatment to complete the surface microfinning treatment before applying the aluminum glue.

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Abstract

The invention discloses fin formation technology for improving alumina sol coating. The technology comprises water sand blasting treatment on the surface of a 0.2 to 0.6 millimeter of Fe-Cr-Al metal wire by using 0.5 to 50 mu m of silicon carbide and water as media and an acid fin formation process of the metal wire subjected to water sand blasting treatment. The technology can remarkably improvethe bonding strength of the coated alumina sol and is used in the automobile post-treatment catalyst industry.

Description

Technical field: [0001] The invention relates to a microfin technology for improving aluminum sol coating, which is applied to the post-treatment of automobile exhaust. Background technique: [0002] In the next few years, global automobile manufacturers, especially the United States and Europe, will enforce some stricter standards on vehicle nitrogen oxides NOx and particulate PM emissions, such as Euro 5 and Euro 6 emission standards. [0003] Under the pressure of emission regulations, on the one hand, foreign vehicle heavy-duty diesel engines are constantly upgrading and improving their technology; on the other hand, they need to choose appropriate after-treatment technology strategies and equipment, such as SCR (Selective Catalytic Reduction) catalytic conversion reduction technology , DPF (Diesel Particulate Filter) particle trap, DOC (Diesel Oxidation Catalyst) oxidation catalyst, etc. [0004] The essence of SCR technology is to use urea to decompose NH at high temp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B05D3/10B05D3/12B24C1/00C23F1/16
Inventor 张克金王丹张苡铭潘艳春崔龙
Owner CHINA FIRST AUTOMOBILE