Silicon-titanium alloy film coat of air preheater tube and electrostatic spraying process thereof

An air preheater and electrostatic spraying technology, applied in the direction of liquid spraying equipment, etc., can solve the problems of affecting health, plastic powder is not resistant to high temperature, low efficiency, etc., and achieve the effect of prolonging service life, controllable thickness, and uniform coating

Inactive Publication Date: 2010-08-04
济南屹林科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has the following disadvantages: (1) the plastic powder is not resistant to high temperature; (2) the workers are in the large spray room where the powder is flying and the dust is all over their bodies, which affects their health and the efficiency is very low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Electrostatic spraying process of silicon-titanium gold film air preheater tube:

[0022] (1) common silicon-titanium gold powder (the source is purchased in Zhenjiang, the composition content SiO 2 50-60%, NiO 1-5%, B 2 o 3 10-15%, TiO 2 12-15%, Pb 2 o 3 5-10%, NaO 2 10-15%) with K 2 O is mixed according to the mass ratio of 98:2, first crushed and then dried and crushed, so that the surface of the powder can be charged;

[0023] (2) Use a shot blasting machine to remove the oil, dust, and rust on the surface of the air preheater tube workpiece. After pretreatment, the workpiece is not only free of oil, rust, and dust on the surface, but also forms a layer on the original silvery white shiny surface. Uniform, rough, corrosion-resistant gray phosphating film that is not easy to rust and can increase the adhesion of the spray coating, which can prevent rust and increase the adhesion of the spray coating;

[0024] (3) When the processed workpiece is rotated at...

Embodiment 2

[0040] Electrostatic spraying process of silicon-titanium gold film air preheater tube:

[0041] (1) Combine ordinary silicon-titanium gold powder with K 2 O mixed according to the mass ratio of 95:5, first crushed and then dried and crushed, so that the surface of the powder can be charged;

[0042] (2) Use a shot blasting machine to remove the oil, dust, and rust on the surface of the air preheater tube workpiece. After pretreatment, the workpiece is not only free of oil, rust, and dust on the surface, but also forms a layer on the original silvery white shiny surface. Uniform, rough, corrosion-resistant gray phosphating film that is not easy to rust and can increase the adhesion of the spray coating, which can prevent rust and increase the adhesion of the spray coating;

[0043] (3) Rotate the processed workpiece at a constant speed at a speed of 50 rpm, and when the vertical speed of three meters per minute passes through the spraying station, use electrostatic powder spr...

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Abstract

The invention relates to a silicon-titanium alloy film coat of an air preheater tube and an electrostatic spraying process thereof, and belongs to the electrostatic spraying technology of an environment-friendly, energy-saving and efficient silicon-titanium alloy film air preheater tube. Main components of the coat comprise SiO2, NiO, B2O3, TiO2, Pb2O3, NaO2 and K2O. A preparation method for the coat comprises the following steps: mixing and crushing common silicon-titanium alloy power and K2O to charge the powder, spraying the mixture to an air preheater steel tube under the high pressure of 30 to 120KV by using a positioning gun, heating and cooling the steel tube, and cushioning a high-temperature pad to obtain the coat. The process can realize automatic powder spraying, does not need manpower, obtains workpieces with unlimited lengths, and has the characteristics of environmental protection, energy conservation and high efficiency; due to the addition of K2O, the atomization is stable, the film is coated uniformly, the mass density is high and the thickness is controllable; the manpower and spraying cost are saved, and the service life is prolonged; and the prepared coat is superior to that in a common enamel process and a plastic powder electrostatic spraying process on the aspects of mechanical strength, adhesive force, high temperature resistance, abrasion resistance, acid and alkali corrosion resistance, ageing resistance and the like.

Description

Technical field: [0001] The invention relates to a silicon-titanium-gold film coating and a preparation process thereof, in particular to a silicon-titanium-gold film on an air preheater tube and an electrostatic spraying process thereof. Background technique: [0002] At present, the production of coated air preheater tubes needs to pickle the tubes (serious pollution), stir the powder into porridge, and paint the pickled tubes by the workers, and hang them to dry. The height is limited. The length is limited, and only pipes with a length of more than 3 meters can be baked out, and the enamelling has to be repeated three times in and out of the furnace three times, which is time-consuming and labor-intensive. Pipes longer than three meters need to be welded, and the welded joints should be painted. Originally, the purpose of porcelain firing on the surface of the steel pipe was for anti-corrosion, but the joints did not have the effect of anti-corrosion, and were soon corr...

Claims

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Application Information

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IPC IPC(8): C03C8/12B05B5/08
Inventor 董冲刘雪芹
Owner 济南屹林科技有限公司
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