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Preparation method of stainless steel surface coating with low temperature insulation

A technology of surface coating and low-temperature insulation, which is applied in the direction of surface coating liquid devices, coatings, special surfaces, etc., can solve the problems of non-conduction, etc., and achieve low cost, excellent chemical stability, and excellent electrical insulation performance Effect

Inactive Publication Date: 2011-02-02
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, stainless steel plates are good conductors of electricity and heat, but some special applications require stainless steel plates to work at a certain temperature (0-300°C) and cannot conduct electricity.
[0003] The sol-gel process to prepare silica film colloids is currently a mature process, but so far there have been no reports on the use of sol-gel processes to load silica films onto stainless steel plates to prepare low-temperature insulating stainless steel surface coatings

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) The ordinary stainless steel sheet is polished with diamond sandpaper with a particle size of 0.5 microns to make its surface clean and smooth, then ultrasonically cleaned for 1 hour, and then placed in an oven at 60°C for drying;

[0020] (2) Preparation of sol, Si(OC 2 h 5 ) 4 , C 2 h 5 OH, H 2 O, mixed according to the following volume ratio, the control composition is: Si(OC 2 h 5 ) 4 : 1 (0.045mol), C 2 h 5 OH: 2 (0.343mol), H 2 O: 0.3 (0.167mol), add 0.08ml HCL (8×10 -6 mol), stirred with a magnetic stirrer at room temperature for 3 hours to completely hydrolyze TEOS to form a sol;

[0021] (3) The sol formed after hydrolysis is aged at room temperature for 3 days, and before complete gelation, the solution viscosity reaches the optimum film coating time;

[0022] (4) Using the dip coating method, the stainless steel sheet is immersed in the colloidal silica solution, and after one minute, it is pulled vertically at a speed of 0.5cm / s, and the coll...

Embodiment 2

[0025] (1) The ordinary stainless steel sheet is polished with diamond sandpaper with a particle size of 0.5 microns to make its surface clean and smooth, and then after ultrasonic cleaning for 2 hours, it is placed in an oven at 60° C. for drying;

[0026] (2) Preparation of sol, Si(OC 2 h 5 ) 4 , C 2 h 5 OH, H 2 O, mixed according to the following volume ratio, the control composition is Si(OC 2 h 5 ) 4 : 2 (0.045mol), C 2 h 5 OH: 6 (0.514mol), H 2 O: 0.8 (0.222mol), add 0.25ml HCL (2.5×10 -5 mol), stirred with a magnetic stirrer at room temperature for 3 hours to completely hydrolyze TEOS to form a sol;

[0027] (3) The sol formed after hydrolysis is aged at room temperature for 5 days, and before complete gelation, the solution viscosity reaches the optimum film coating time;

[0028] (4) Using the dip coating method, the stainless steel sheet is immersed in the colloidal silica solution, and after one minute, it is pulled vertically at a speed of 0.5cm / s, and ...

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Abstract

The invention relates to a preparation method of a stainless steel surface coating with low temperature insulation, comprising the following steps: (1) polishing a common stainless steel substrate by a diamond sandpaper, then performing the ultrasonic cleaning and drying; (2) mixing Si(OC2H5)4, C2H5OH and H2O, adding HCL, and stirring by magnetic force for 3 hours under the room temperature to form a sol; (3) aging the sol for 3 to 14 days under the room temperature to form a silica colloidal solution; and (4) coating the silica colloid by the immersion method to prepare the needed stainless steel substrate. The stainless steel surface coating with low temperature insulation prepared by the method has high bonding strength, so that the stainless steel plate can bear the temperature of 0 to 300 DEG C and has the insulation function. The preparation method has the characteristics of simple operation, simple production process, low production cost and the like.

Description

technical field [0001] The invention belongs to the field of preparation of stainless steel surface coatings, in particular to a method for preparing low-temperature insulating stainless steel surface coatings. Background technique [0002] Stainless steel has been widely used in all aspects of human society. Stainless steel relies on an extremely thin, firm and fine "passivation film" formed on its surface to prevent the steel plate from being infiltrated and oxidized, thereby obtaining the ability to resist corrosion . Once this film is damaged for some reason, air or liquid will continue to infiltrate, and iron atoms in the metal will continue to separate out, forming rust. Therefore, it is very meaningful to protect the surface of stainless steel to a certain extent. In addition, stainless steel plates are good conductors of electricity and heat, but some special applications require stainless steel plates to work at a certain temperature (0-300°C) and cannot conduct e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D3/02B05D3/00B05D5/12B05C3/09C09D1/00
Inventor 王瑛侯京山蒋伟忠钱蕙春王钢陈小英
Owner DONGHUA UNIV
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