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A high temperature chlorine corrosion resistant coating for boiler heating surface and its preparation method

A heat-receiving surface and high-temperature-resistant technology, applied in coatings, anti-corrosion coatings, fire-resistant coatings, etc., can solve problems such as high brittleness, poor thermal shock resistance, and easy cracking, and achieve improved density and hardness, low cost, and increased The effect of strength and toughness

Active Publication Date: 2021-12-07
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of ceramic coatings by the precursor method has the advantages of simple process, convenient operation, and strong resistance to high-temperature chlorine corrosion, but it also has disadvantages such as easy cracking, high brittleness, and poor thermal shock resistance.

Method used

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  • A high temperature chlorine corrosion resistant coating for boiler heating surface and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Weigh respectively 60% perhydropolysilazane and 20% graphite powder by volume, add them in turn to 20% butyl acetate, grind for 1 hour with a planetary ball mill, and then mechanically Stir with a mixer for 1 hour, then filter and encapsulate the paint sprayed as a transition layer. Then weigh the organopolysilazane, the barium glass powder of 30%, the zirconia powder of 15% and the aluminum powder of 5% respectively by volume percentage, add successively the butyl acetate of 30% by volume After being ground by a planetary ball mill for 1 hour, stirred by a mechanical stirrer for 1 hour, the coating sprayed as an organic polysilazane precursor composite ceramic coating was filtered and encapsulated.

[0021] The coating preparation process is as follows: first, the surface of the alloy steel substrate on the heating surface is pretreated by sandblasting; then the prepared transition layer coating is sprayed on the surface of the substrate, and placed in a heating furnac...

Embodiment 2

[0023] Weigh respectively 70% perhydropolysilazane and 15% graphite powder by volume, add them in turn to 15% butyl acetate, grind for 1 hour with a planetary ball mill, and then mechanically Stir with a mixer for 1 hour, then filter and encapsulate the paint sprayed as a transition layer. Then weigh the organopolysilazane, the barium glass powder of 25%, the zirconia powder of 20% and the aluminum powder of 10% respectively by volume percentage, add successively the butyl acetate of 20% by volume After being ground by a planetary ball mill for 1 hour, stirred by a mechanical stirrer for 1 hour, the coating sprayed as an organic polysilazane precursor composite ceramic coating was filtered and encapsulated.

[0024] The coating preparation process is consistent with Example 1.

Embodiment 3

[0026] Weigh respectively 60% perhydropolysilazane and 20% graphite powder by volume, add them in turn to 20% butyl acetate, grind for 1 hour with a planetary ball mill, and then mechanically Stir with a mixer for 1 hour, then filter and encapsulate the paint sprayed as a transition layer. Then weigh the organopolysilazane, the barium glass powder of 25%, the zirconia powder of 20% and the aluminum powder of 5% respectively by volume percentage, add successively the butyl acetate of 25% by volume After being ground by a planetary ball mill for 1 hour, stirred by a mechanical stirrer for 1 hour, the coating sprayed as an organic polysilazane precursor composite ceramic coating was filtered and encapsulated.

[0027] The coating preparation process is consistent with Example 1.

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Abstract

The invention relates to a high-temperature chlorine corrosion resistant coating for a heating surface of a boiler and a preparation method thereof. The coating comprises an inner transition layer and an outer protective layer, the transition layer is a perhydropolysilazane precursor composite ceramic coating, and the protective layer is an organic polysilazane precursor composite ceramic coating. The transition layer is composed of 60-70% perhydropolysilazane, 10-20% graphite powder and 10-20% butyl acetate by volume. After spraying on the surface of the steel substrate, it is cured at a high temperature at 200 ° C. . The protective layer consists of 20-25% organic polysilazane, 25-30% barium glass powder, 15-20% zirconia, 5-10% aluminum powder and 20-30% butyl acetate by volume. On the transition layer, it is cured at a high temperature of 700°C. The preparation process of the coating is simple and the cost is low. It can be applied to the high-temperature chlorine corrosion protection of heating surfaces of various biomass boilers, waste incineration boilers and high-chlorine coal boilers. It has high toughness, compact surface, and strong thermal shock resistance. advantage.

Description

technical field [0001] The invention belongs to the technical field of special coatings, and in particular relates to a high-temperature chlorine corrosion-resistant coating for a heating surface of a boiler and a preparation method thereof. Background technique [0002] Most of the biomass and garbage are high-chlorine fuels. Due to the growth environment and other factors, the chlorine content of the former is as high as 0.1-2% due to the growth environment and other factors, and the chlorine content of the latter is as high as 0.5-2% due to the presence of plastic, rubber and kitchen waste. 2%. When burning high-chlorine fuel, the heating surface of the boiler is prone to high-temperature chlorine corrosion. According to statistics, the corrosion rate of the tube wall on the heating surface of boilers burning biomass and domestic waste can reach 5-12 mm / year, resulting in frequent replacement of tubes on the heating surface, which seriously affects the safe and economica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D5/18C09D5/10C09D183/16C09D7/61
CPCC08K2003/0812C08K2003/2244C09D5/103C09D5/18C09D183/16C09D7/61C08K3/04C08K3/00C08K3/40C08K3/22C08K3/08
Inventor 王进卿佟世琪王杰李探宇徐凯莉张晨阳马新宇王智猛张沐安林子祥
Owner CHINA JILIANG UNIV
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