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Geopolymer coating layer suitable for metal substrate and preparation method of geopolymer coating layer

A technology of metal substrates and geopolymers, applied in cement production, etc., can solve the problems of low bonding strength of metal substrates, large differences in properties and metals, and large coating thickness, etc., to achieve low raw material costs, uniform thickness, and easy operation Effect

Active Publication Date: 2019-10-08
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, since geopolymers are mainly composed of silicon-oxygen and aluminum-oxygen bonds, their properties are quite different from those of metals
For the preparation of geopolymer coatings on the surface of metal substrates, the commonly used methods are spin coating and dip coating. Both spin coating and dip coating methods face the problem of cracks caused by the shrinkage of geopolymer coatings during the curing process. In addition, local When the viscosity of the polymer precursor is high, it will lead to problems such as large coating thickness, low bonding strength with the metal substrate after curing, and peeling off.

Method used

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  • Geopolymer coating layer suitable for metal substrate and preparation method of geopolymer coating layer
  • Geopolymer coating layer suitable for metal substrate and preparation method of geopolymer coating layer
  • Geopolymer coating layer suitable for metal substrate and preparation method of geopolymer coating layer

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Embodiment 1

[0033] Prepare metakaolin-based polymer coating on the surface of Al alloy, the specific steps are as follows:

[0034] 1) take by weighing 100g sodium silicate (which contains 80wt% Na 2 O 3.35SiO 2 , 20wt% H 2 O), 6.7g of NaOH and 150g of H 2 O, and then mixed uniformly and placed in a 40°C oven for 24h to obtain a transparent alkali activator; then weighed 99g metakaolin (containing 55wt% of SiO 2 , 39wt% Al 2 o 3 and 6wt% impurity) and 256.7g of the base activator, the two were mixed in a stirrer, the stirrer speed was 700r / min, and the stirring time was 10min. A metakaolin-based geopolymer precursor that is uniformly mixed and fluid is obtained.

[0035] 2) Pour the metakaolin-based geopolymer precursor prepared in step 1) into a container, and use an air spray gun to spray on the surface of the Al alloy that has undergone degreasing treatment. The air pressure during spraying is 0.6MPa, and the spraying time is 5s; Geopolymer precursor coating.

[0036] 3) Curing...

Embodiment 2

[0041] Prepare the metakaolin-based polymer coating on the steel surface, and the specific steps are as follows:

[0042] 1) take by weighing 100g sodium silicate (which contains 80wt% Na 2 O 3.35SiO 2 , 20wt% H 2 O), 9.2g NaOH and 160H 2 O, and then mixed uniformly and placed in a 40°C oven for 24h to obtain a transparent alkali activator; then weigh 107g metakaolin (containing 55wt% of SiO 2 , 39wt% Al 2 o 3 and 6wt% impurity) and 269.2g of the base activator, the two were mixed in a stirrer, the stirrer speed was 500r / min, and the stirring time was 20min. A metakaolin-based geopolymer precursor that is uniformly mixed and fluid is obtained.

[0043] 2) Pour the metakaolin-based geopolymer precursor prepared in step 1) into a container, and use an air spray gun to spray on the steel surface that has undergone degreasing treatment. The air pressure during spraying is 0.5MPa, and the spraying time is 10s; Geopolymer precursor coating.

[0044] 3) Curing the geopolymer ...

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Abstract

The invention discloses a geopolymer coating layer suitable for a metal substrate and a preparation method of the geopolymer coating layer. The preparation method includes the steps of firstly, evenlymixing sodium silicate, NaOH and H2O, and drying to obtain a transparent alkali-activator; secondly, weighing geopolymer synthesizing raw materials and the alkali-activator, and mixing and stirring to obtain flowing-state geopolymer precursor; thirdly, spraying the geopolymer precursor to the surface of metal to obtain a geopolymer coating layer; thirdly, curing the obtained coating layer in theair to obtain the geopolymer coating layer. The preparation method has the advantages that the method is simple, easy to operate and cheap in raw materials; the real geopolymer coating layer uniform in thickness can be prepared, the geopolymer coating layer can be firmly combined with the metal substrate, and the cured coating layer is free of defects such as cracks; in addition, the geopolymer coating layer on the surface of the metal substrate can favorably improve the heat resistance and corrosion resistance of metal and is promising in industrial application prospect.

Description

technical field [0001] The invention belongs to the field of preparation of geopolymer coatings, in particular to a geopolymer coating suitable for metal substrates and a preparation method thereof. [0002] technical background [0003] Geopolymers ("geopolymers" for short) refer to natural minerals or solid wastes and artificial silicon-aluminum compounds, etc. The rubber material has a wide range of main raw material sources and a relatively simple preparation process (no high-temperature roasting is required), and has the advantages of low cost, energy saving and environmental protection. Geopolymers have the characteristics of high strength, high temperature resistance, acid and alkali corrosion resistance, and excellent radiation resistance, so they can be widely used in various fields of industry. [0004] Depositing a geopolymer coating on the metal surface is beneficial to improve the heat resistance and corrosion resistance of the metal. Therefore, the preparation...

Claims

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Application Information

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IPC IPC(8): C04B12/00C04B28/00C04B28/26
CPCC04B12/005C04B28/006C04B28/26C04B2111/00525C04B2111/00577C04B14/041Y02P40/10
Inventor 毛样武丽莎·贝尔赛托保罗·哥伦布
Owner WUHAN INSTITUTE OF TECHNOLOGY
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