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Enamel coating with function of resisting sulfuric acid and hydrochloric acid dew point corrosion and preparation technology thereof

A hydrochloric acid dew point and preparation process technology, applied in the field of inorganic protective coatings, can solve the problems of poor acid and alkali corrosion resistance, easy generation of pores on the surface of the coating, environmental pollution of the electroplating solution, etc., and achieves a non-toxic and excellent preparation process. Excellent corrosion resistance and adhesion

Active Publication Date: 2018-08-17
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

More importantly, the organic coating has the disadvantages of poor heat resistance, low thermal conductivity, and difficulty in matching the thermal expansion coefficient with the base metal. During use, the surface of the coating is prone to pores, which causes the coating to wrinkle. Applications in anti-dew point corrosion are limited
[0004] The coating prepared by electroplating has good bonding force, good impact resistance and decorative effect, but the acid and alkali corrosion resistance is not good, and the electroplating solution is easy to cause environmental pollution, and the cost of waste liquid treatment is high.
[0005] Although protective coatings prepared by methods such as plasma spraying, magnetron sputtering, and electron beam vapor deposition have superior performance, they require high equipment, expensive preparation costs, and complicated processes, which are not suitable for mass production.

Method used

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  • Enamel coating with function of resisting sulfuric acid and hydrochloric acid dew point corrosion and preparation technology thereof
  • Enamel coating with function of resisting sulfuric acid and hydrochloric acid dew point corrosion and preparation technology thereof
  • Enamel coating with function of resisting sulfuric acid and hydrochloric acid dew point corrosion and preparation technology thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0042] The preparation process of the enamel coating comprises the following steps: (1) slurry preparation, (2) bottom glaze slurry spraying, (3) high temperature firing of the bottom glaze, (4) cooling, (5) surface glaze Slurry spraying, (6) surface glaze firing at high temperature, (7) cooling.

[0043] In the slurry preparation process, use a planetary ball mill to mix the analytically pure raw materials weighed according to the formula for 1-2 hours, and then smelt at 1350-1450°C for 2-3 hours, then water-quench into glass glaze blocks, and use planetary The glaze block is ball-milled by a type ball mill, and finally the enamel powder after ball milling is passed through a 200-mesh sieve. The process of planetary ball mill ball milling glaze block is as follows: the speed is 300-400r / min, and the time is 100-200h. Add analytically pure micron oxide particles to enamel powder to form a mixed powder, mix the mixed powder with absolute ethanol at a ratio of 1g: 10-20ml, and ...

Embodiment 1

[0047] In this example, according to the proportion of SiO 2 : 60.0%, Al 2 o 3 : 5.2%, Na 2 O: 10.9%; K 2 O: 5.2%, B 2 o 3 : 10.9%, CoO: 2.2%; CaF 2 : 5.6% (mass fraction) equipped with raw materials, mixed by planetary ball mill for 1.5h, then smelted at 1350°C for 2h, water quenched into enamel block. The enamel glaze is subjected to planetary ball milling for 150 hours at a speed of 300 r / min, and the enamel powder is passed through a 200-mesh sieve. Weigh 1.8g of the enamel glaze powder, 0.2g of aluminum oxide with a particle size of 1-10 μm, add 30ml of absolute ethanol, mix well, put them into an ultrasonic vibrator to fully vibrate and disperse to obtain a slurry. The slurry was sprayed onto the surface of the sandblasted Q235 steel sample by spraying, and then fired at 860°C for 300s, taken out and air-cooled to obtain an enamel bottom glaze layer.

[0048] In proportion to SiO 2 : 61.3%, Al 2 o 3 : 5.4%, Na 2 O: 11.1%; K 2 O: 5.4%, B 2 o 3 : 11.1%, CaF ...

Embodiment 2

[0051] The difference from Example 1 is that: the Q235 steel coated with the enamel coating with a thickness of 200 μm was corroded by 80° C. and 30 wt % sulfuric acid solution for 7 days. After corrosion, the coating is intact, and there is no phenomenon of blistering or peeling. Such as image 3 As shown, it can be seen from the corrosion kinetic curve that the weight loss of the coated sample is only -0.1035mg / cm2 after 7 days of 30wt% sulfuric acid corrosion at 80°C 2 . The sulfuric acid corrosion resistance of the enamel coating is much higher than the national standard (national standard GB / T19353-2003 for boiling sulfuric acid corrosion resistance: after 18 hours of corrosion, weight loss 2 ). The uncoated Q235 steel exhibits catastrophic corrosion. After 2 days of corrosion, the entire sample was completely corroded and dissolved by the sulfuric acid solution.

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Abstract

The invention relates to the field of inorganic protection coatings, and particularly provides an enamel coating with the function of resisting sulfuric acid and hydrochloric acid dew point corrosionand a preparation technology thereof. The enamel coating can serve as Q235 steel, BTC1 steel, 304 stainless steel and other metal material parts. Micron oxide particles are uniformly dispersed and distributed in an enamel glaze substrate parent phase, wherein enamel glaze is formed by mixing and melting the analytical pure raw materials (such as: silicon dioxide, aluminum sesquioxide, diboron trioxide, sodium oxide, potassium oxide, nickel oxide, cobalt oxide and calcium fluoride) at the high temperature and water quenching, and the micron oxide particles are one or arbitrary combination of analytical pure aluminum sesquioxide, silicon dioxide, titanium dioxide and zirconium dioxide. The enamel coating is prepared from the raw materials which can be purchased in the market directly, and the preparation technology is free of toxicity and pollution in the process, and conforms to the energy-saving and environment-friendly development trend. The enamel coating is compact and free of pores, has higher strength, fracture toughness, good binding force with a steel substrate and a matched coefficient of thermal expansion.

Description

technical field [0001] The invention relates to the field of inorganic protective coatings, and in particular provides an enamel coating resistant to sulfuric acid and hydrochloric acid dew point corrosion and a preparation process thereof, which can be used for Q235 steel, BTC1 steel, 304 stainless steel and other metal material parts. Background technique [0002] The fuel used in boilers in petrochemical, electric power and other industrial sectors often contains a small amount of sulfur, and the flue gas formed by combustion contains corrosive gases (such as: SO 2 , SO 3 , CO 2 、H 2 O) and unburned carbon, etc. After the flue gas enters the heat exchanger, it will condense on the surface of the cold end of the heat exchanger to form sulfuric acid. The temperature at the cold end of the heat exchanger is usually between 80 and 120 °C, which is the temperature range of the flue gas dew point. Once dew point corrosion occurs in the heat exchanger, it may be perforated ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C8/14C23D5/02
CPCC03C8/14C23D5/02
Inventor 陈明辉陈肯王群昌周文王福会
Owner NORTHEASTERN UNIV
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