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Method for preparing enhanced heat-transfer and scale prevention coating of micron/nanometer titanium dioxide on stainless steel substrate

A technology of enhancing heat transfer and titanium dioxide, which is applied in the coating process of metal materials, etc., can solve the problems of low sintering temperature, easy oxidation of the substrate, and low temperature resistance, etc., and achieve the effect of firm bonding, small roughness, and low market price

Inactive Publication Date: 2012-11-07
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has the problems of easy oxidation of the substrate during sintering in an air atmosphere, low sintering temperature, high temperature resistance, and low strength.

Method used

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  • Method for preparing enhanced heat-transfer and scale prevention coating of micron/nanometer titanium dioxide on stainless steel substrate
  • Method for preparing enhanced heat-transfer and scale prevention coating of micron/nanometer titanium dioxide on stainless steel substrate
  • Method for preparing enhanced heat-transfer and scale prevention coating of micron/nanometer titanium dioxide on stainless steel substrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] (a) Coarse grinding: use 300# sandpaper to remove surface dirt and the initial groove of the base until the surface of the base is completely covered with 300# sandpaper texture; use 500# sandpaper to polish until the base surface is covered with 500# sandpaper texture; then use 1000# Sand paper until the substrate surface is covered with 1000# sandpaper texture. Fine Grinding: Grinding with 2000# sandpaper to remove streaks, the base texture is very fine and bright at this time. Polishing: Coat commercially available green polishing soap with the wool polishing wheel of C121 type metal polishing machine, polish the stainless steel substrate surface for 5 minutes, the surface roughness after polishing Ra=23.0nm; Ultrasonic immersion cleaning in NaOH solution with a mass percentage of 3% and a temperature of 40°C for 5 minutes to remove stubborn grease; then immerse the sample in hydrochloric acid with a mass percentage of 3% and a temperature of 30°C for 10 minutes to r...

Embodiment 2

[0050] (a) Coarse grinding: use 400# sandpaper to grind along the same direction to remove surface dirt and the initial groove of the base until the base surface is completely covered with 400# sandpaper texture; use 700# sandpaper to grind along the 90° direction of the 400# sandpaper texture until The base surface is covered with 700# sandpaper texture; then use 1500# sandpaper to polish along the 90° direction of the 700# sandpaper texture until the base surface is covered with 1500# sandpaper texture. Fine Grinding: Grinding with 2500# sandpaper to remove streaks, the base texture is very fine and bright at this time. Polishing: Coat commercially available green polishing soap with the wool polishing wheel of C121 type metal polishing machine, polish the stainless steel substrate surface for 10 minutes, the surface roughness after polishing Ra=36.2nm; Ultrasonic immersion and cleaning in NaOH solution with a mass percentage of 8% and a temperature of 60°C for 10 minutes to...

Embodiment 3

[0055] (a) Coarse grinding: use 300# sandpaper to grind along the same direction to remove surface dirt and the initial groove of the base until the base surface is completely covered with 300# sandpaper texture; use 900# sandpaper to grind along the 90° direction of the 300# sandpaper texture until The base surface is covered with 900# sandpaper texture; then use 1800# sandpaper to polish along the 90° direction of the 900# sandpaper texture until the base surface is covered with 1800# sandpaper texture. Fine Grinding: Grinding with 2000# sandpaper to remove streaks, the base texture is very fine and bright at this time. Polishing: Coat commercially available green polishing soap with the wool polishing wheel of C121 type metal polishing machine, polish the stainless steel substrate surface for 5 minutes, the surface roughness after polishing Ra=45.9nm; Ultrasonic immersion and cleaning in NaOH solution with a mass percentage of 3% and a temperature of 40°C for 5 minutes to r...

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Abstract

The invention discloses a method for preparing an enhanced heat-transfer and scale prevention coating of micron / nanometer titanium dioxide on a stainless steel substrate, comprising the following steps of: (a) pre-treating the stainless steel substrate; (b) preparing ammonium fluorotitanate and boric acid into uniform solutions, and mixing the two solutions uniformly; (c) placing the prepared mixed solution in a water bath and controlling the temperature thereof at 20-80 DEG C, suspending the stainless steel substrate perpendicularly in the mixed solution and starting to deposit to prepare the substrate coated with TiO2 thin film after the temperature of the mixed solution is stable; (d) after deposition, picking the substrate out and washing the surface of the substrate with distilled water; and (e) drying the substrate naturally, then placing the substrate in a resistance furnace to heat to obtain the micron / nanometer TiO2 surface coating. The coating prepared by adopting the methodis compact and uniform in appearance and the Ra value of the sintered surface coating is substantially equal to that of the polished surface coating. The coating is high-temperature resistant and is combined with the substrate more firmly.

Description

technical field [0001] The invention relates to a method for preparing micro-nano TiO on a stainless steel substrate by a liquid phase deposition method 2 The method of coating, especially relates to a kind of TiO with micro-nanometer thickness on stainless steel substrates such as austenitic 300 series and martensitic 400 series. 2 Liquid-phase deposition preparation method for enhanced heat transfer and antifouling surfaces. Background technique [0002] At present, more than 90% of heat exchange equipment generally has fouling problems in operation. The formation of dirt on the surface of heat exchange equipment not only affects the utilization of heat energy and the normal and safe operation of production, but also increases production costs. Statistics in 2007 show that the fouling loss of heat exchange equipment in developed countries accounts for about 0.15-0.25% of GNP, while it is higher in developing countries, reaching 0.3%. The prevention and elimination of in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/34C23C22/77C23C22/78C23C22/82
Inventor 刘明言蔡永伟
Owner TIANJIN UNIV
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