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Preparation methods of high temperature resistant anticorrosion potassium silicate coating and corresponding coat

An anti-corrosion and high-temperature-resistant technology, applied in the scientific field, can solve problems such as harsh construction conditions, poor shielding performance, and unstable coatings, and achieve the effects of thermal stress dispersion, high-temperature resistance, and heat resistance

Active Publication Date: 2014-09-17
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Inorganic coatings represented by water-based zinc-rich coatings have good high temperature resistance, but the microporosity of the coating leads to poor shielding performance, premature failure of the coating, tendency to crack when the coating is thick, and harsh construction conditions, etc. shortcoming
Although the corrosion resistance can be improved by increasing the modulus of silicate, it is easy to gel when the modulus is high, and the coating is unstable

Method used

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  • Preparation methods of high temperature resistant anticorrosion potassium silicate coating and corresponding coat
  • Preparation methods of high temperature resistant anticorrosion potassium silicate coating and corresponding coat
  • Preparation methods of high temperature resistant anticorrosion potassium silicate coating and corresponding coat

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Weigh 100 g of nano-Cr powder with a particle size of 50 nm, 100 g of aluminum tripolyphosphate, 650 g of aluminum oxide with a particle size of 2 μm, and 50 g of Zn powder with a particle size of 20 μm into a ball mill tank at 300 rpm Ball milling component 2 1h. Weigh 550g of potassium silicate with a modulus of 3.0, 450g of component two, add potassium silicate while stirring to fully mix component two powder with potassium silicate, add 200g of distilled water, and stir in a mixer at 2300rpm After 5 minutes, the paint was obtained after filtering through a 200-mesh screen. Spray or brush the paint on the surface of carbon steel, cast iron or stainless steel parts that have been sandblasted by spraying or brushing. After the surface is dry for 6 minutes, put it in a resistance furnace with a furnace temperature of 210°C for 1.5 hours. After taking out the air cooling, a high-temperature resistant and anti-corrosion coating is obtained.

Embodiment 2

[0028] Weigh 100 g of Cr powder with a particle size of 100 nm, 30 g of aluminum tripolyphosphate, 140 g of aluminum oxide with a particle size of 50 μm, and 80 g of Zn powder with a particle size of 30 μm into a ball milling tank at 350 rpm. Two 1.2h. Weigh 520g of potassium silicate with a modulus of 3.5, 280g of component two, add potassium silicate while stirring to fully mix component two powder with potassium silicate, add 100g of distilled water, and stir in a mixer at 2400rpm 15 minutes later, the coating was obtained after filtering through a 200-mesh screen. Spray or brush the paint on the surface of carbon steel, cast iron or stainless steel parts that have been sandblasted by spraying or brushing. After the surface is dry for 8 minutes, it is placed in a resistance furnace with a furnace temperature of 200 ℃ for 0.5 hours. After taking out the air cooling, a high-temperature resistant and anti-corrosion coating is obtained.

Embodiment 3

[0030] Weigh 192g of Cr powder with a particle size of 30nm, 18g of aluminum tripolyphosphate, 688g of aluminum oxide with a particle size of 45μm, and 200g of Zn powder with a particle size of 30μm into a ball mill tank at 330rpm. Component two 1.5h. Weigh 800g of potassium silicate with a modulus of 3.5, 1200g of component two, add potassium silicate while stirring to fully mix component two powder with potassium silicate, add 500g of distilled water, and stir in a mixer at 2450rpm After 10 minutes, the coating was obtained after filtering through a 200-mesh screen. Spray or brush the paint on the surface of carbon steel, cast iron or stainless steel parts that have been sandblasted by spraying or brushing. After the surface is dry for 10 minutes, put it in a resistance furnace with a furnace temperature of 235°C for 1.2h . After taking out the air cooling, a high-temperature resistant and anti-corrosion coating is obtained.

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Abstract

The invention relates to preparation methods of a high temperature resistant anticorrosion potassium silicate coating and a corresponding coat. The high temperature resistant anticorrosion potassium silicate coating is formed by a solute and a solvent, wherein the solute comprises a component A liquid potassium silicate having a module of 3.0-4.0 and a weight accounting for 30-80% of the total weight of the coating, and a component B which comprises nanometer Cr powder having a weight accounting for 1-15% of the total weight of the coating, aluminum triphosphate having a weight accounting for 3-20% of the total weight of the coating, Zn powder having a weight accounting for 5-20% of the total weight of the coating and Al2O3 having a weight accounting for 10-50% of the total weight of the coating; and the solvent is water, and the weight ratio of the solvent to the solute is 1:3-10. The method for preparing the coat through utilizing the coating comprises the following steps: spraying or brushing the coating on the surface of a sandblasted steel iron part, drying the surface for 5-10min, carrying out temperature maintenance for 0.5-4h according to a furnace temperature of 200-260DEG C, taking out the part, and air-cooling the part to obtain the coat. The coat of the invention has the characteristics of high temperature resistance, anticorrosion and water resistance, and has the advantages of good thermal shock resistance, nontoxicity, no pollution, and environmental protection benefiting.

Description

Technical field [0001] The invention relates to science, and in particular provides a method for preparing a high temperature resistant and corrosion resistant potassium silicate coating and a corresponding coating mainly used for steel materials. Background technique [0002] Ordinary steel such as carbon steel and cast iron are widely used in various fields of national economic construction as a kind of economical material, but its low corrosion resistance and oxidation resistance require corresponding protective measures. Stainless steel has good corrosion resistance at room temperature, but at higher temperatures, its oxidation resistance is poor, especially in the salt spray environment. Organic coatings have a long history of application as protective coatings for metal materials, but one disadvantage of organic coatings is that they contain organic solvents, which are very unfavorable for protecting the environment. On the other hand, most organic coatings have poor weat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D1/02C09D5/10
Inventor 王成朱圣龙王福会
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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